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Addition Scope · Statistics
Home addition statistics for 2026
127 sourced data points on home additions: what projects cost, what they return at resale, what homeowners choose, how many U.S. homes already have each feature by region, and 3 findings from Addition Scope's own analysis of federal household data. Every number links to where it came from.
What Addition Scope's analysis of federal data shows
These comparisons were calculated by Addition Scope from the Energy Information Administration's 2024 household survey microdata and the Census Bureau's new-housing tables. They answer questions the published reports don't break out.
Addition Scope analysis · 2024
Owner-occupied basement homes built before 199044.0%
95% interval 42.3%–45.8% · about 10.9 million homes · 3,742 survey households
Owner-occupied basement homes built in 1990–202429.4%
95% interval 27.1%–31.8% · about 3.2 million homes · 1,723 survey households
Difference: 14.6 percentage points (95% interval 11.8 to 17.5).
Older houses are far more likely to have a basement that was never finished. If your home predates 1990, the basement is probably raw space with the most room to add living area, and also the most likely to need moisture and egress work first.
Source: Addition Scope analysis of 2024 federal household survey data from the U.S. Energy Information Administration. How we calculated it
Addition Scope analysis · 2024
Owner-occupied homes built before 199036.6%
95% interval 35.3%–38.0% · about 19.6 million homes · 7,124 survey households
Owner-occupied homes built in 1990–20247.0%
95% interval 6.2%–7.8% · about 2.5 million homes · 4,841 survey households
Difference: 29.7 percentage points (95% interval 27.9 to 31.4).
Older homes are much more likely to have a single full bathroom. That is why a second bath is one of the most common additions in pre-1990 houses, and why plumbing access decides the price.
Source: Addition Scope analysis of 2024 federal household survey data from the U.S. Energy Information Administration. How we calculated it
Addition Scope analysis · 2024
Owner-occupied attic homes built before 199084.9%
95% interval 83.7%–86.0% · about 28.3 million homes · 4,357 survey households
Owner-occupied attic homes built in 1990–202488.4%
95% interval 87.0%–89.8% · about 20.9 million homes · 3,127 survey households
Difference: -3.5 percentage points (95% interval -5.1 to -1.9).
Unfinished attics are more common in older houses. If you're short on space, the attic can be cheaper to convert than an addition, provided headroom, stairs and floor strength work.
Source: Addition Scope analysis of 2024 federal household survey data from the U.S. Energy Information Administration. How we calculated it
Home additions: costs and prices
$21,891–$83,356 Typical U.S. home addition project range, $50,997 average (Angi, 2026)
Angi's addition cost guide, updated May 2026, puts the typical project between $21,891 and $83,356 with a $50,997 average. It is a mix of bump-outs, rooms and suites, not a price for a specified addition; building up, utility changes and existing-house work are priced separately.
Angi, How Much Do Home Additions Cost (2026)$166,406 National average cost of a 660 sq ft detached ADU in Cost vs. Value 2025
Zonda's new ADU line item, a one-story 26-by-30-foot unit with bedroom suite, bath, kitchen and mini-split, costs $166,406 nationally (about $252 per sq ft) and recoups 41.3% ($68,656) at resale before any rental income is counted.
Zonda, 2025 Cost vs. Value Report$51,000 HomeAdvisor's national average cost of a home addition
HomeAdvisor's guide (updated June 2026) puts additions at $21,896 to $83,355 with a $51,000 average and $80 to $210 per square foot for ground-level space. Room averages: bathroom $35,000, bedroom $62,500, kitchen $55,000, attic $40,000.
HomeAdvisor, How Much Does a Home Addition Cost (2026)$80–$210 / sq ft HomeAdvisor's per-square-foot range for a ground-level home addition
HomeAdvisor's guide (updated June 17, 2026) says home additions typically run $80 to $210 per square foot including labor and materials, which it converts to $16,000 to $42,000 for 200 sq ft, $32,000 to $84,000 for 400 sq ft and $80,000 to $210,000 for 1,000 sq ft.
HomeAdvisor, How Much Does a Home Addition Cost (2026)$175,000 HomeAdvisor's average cost to add a second story
HomeAdvisor's add-a-story guide (updated June 20, 2026) puts the average second-story addition at $175,000, with most between $100,000 and $250,000 and $100 to $300 per square foot, up to $500 with high-end materials. Materials make up nearly two-thirds of the cost; a structural engineer averages $550, blueprints $1,740 and permits $1,200 to $2,000.
HomeAdvisor, How Much Does It Cost to Add a Second Story (2026)$3,600 Upper end of typical home addition permit fees in CADTRI's 2026 guide
CADTRI's July 2026 guide reports addition permit fees from a few hundred dollars up to roughly $3,600, or $0.15 to $0.85 per square foot, with $200 to $500 charged per correction cycle, $1,200 to $2,100 for permit drawings and $500 to $1,000 or more for an engineer's review and stamp.
CADTRI, Home Addition Permits, Drawings, Costs and Approval Timeline (2026 Guide)1–3% Seller closing costs before agent commission, per HomeLight
HomeLight's March 2026 guide puts seller closing costs (title, settlement and taxes) at 1% to 3% of the sale price, with listing commission around 3% and up to about 6% when the seller also pays the buyer's agent after the NAR settlement.
HomeLight, What Fees Are Associated With Selling a House (2026)$100–$300 / sq ft Second-story additions cost $100–$300 per square foot on HomeAdvisor
HomeAdvisor's add-a-story guide (June 2026) puts most second stories at $100 to $300 per square foot, up to $500 with high-end materials, against $80 to $210 for building out, because the existing roof comes off and walls and foundation may need reinforcement. On a 1,000 sq ft second floor that is $100,000 to $300,000.
HomeAdvisor, How Much Does It Cost to Add a Second Story (2026)5–20% Architect fees run 5% to 20% of an addition's budget
HomeAdvisor reports architects charge 5 to 20% of project cost, construction managers 5 to 15% and general contractors 10 to 20%, with building permits at $200 to $3,000. Design and management fees can add a quarter or more on top of construction.
HomeAdvisor, How Much Does a Home Addition Cost (2026)$27,000 Average cost of a bump-out addition
HomeAdvisor (June 2026) prices bump-outs at $10,000 to $43,000 with a $27,000 average and $90 to $300 per square foot; bathrooms cost most ($200 to $300 per sq ft). A cantilevered bump-out can extend 24 inches without its own foundation, and most finish in one to four weeks.
HomeAdvisor, How Much Does It Cost to Build a Bump-Out Addition (2026)$47,000 Average cost of a sunroom addition
HomeAdvisor (June 2026) puts sunrooms at $22,000 to $75,000 with a $47,000 average; three-season rooms run $10,000 to $40,000 and four-season rooms $25,000 to $120,000, at $150 to $300 per square foot for custom builds.
HomeAdvisor, How Much Does a Sunroom Addition Cost (2026)$300–$500 / sq ft HomeGuide's per-square-foot cost to build up a second story
HomeGuide's addition guide contrasts ground-level additions at $80 to $200 per square foot with second stories at $300 to $500 per square foot, and bump-outs at $85 to $200 per square foot. Use it as a second data point beside HomeAdvisor's lower second-story range.
HomeGuide, Home Addition Cost (2026)$110,000 Angi's average cost to convert a garage into an ADU
Angi reports garage-to-ADU conversions average $110,000 at $150 to $400 per square foot, from about $25,000 for a basic attached single-car conversion to $225,000 for a detached rentable unit with kitchen and bath; detached garages add 20 to 30% for utility runs.
Angi, How Much Does It Cost to Convert a Garage to an ADU (2026)
Home additions: resale value and return
32.3% Midrange primary suite addition recoups about a third of its cost
Zonda's 2025 Cost vs. Value Report prices a midrange primary suite addition at $170,517 nationally with $55,097 of resale value, a 32.3% return. Additions are lifestyle purchases first; only exterior replacements and minor kitchen work top 100%.
Zonda, 2025 Cost vs. Value Report18.0% Upscale primary suite addition recoups just 18% at resale
The 2025 Cost vs. Value upscale primary suite addition costs $351,613 on average and adds an estimated $63,136 to resale. Spending more on finishes lowers the recovery ratio, so match the addition to the neighborhood.
Zonda, 2025 Cost vs. Value Report53.3% Midrange bathroom addition recoups about 53% of a $60,645 job
The national average in Zonda's 2025 Cost vs. Value report for a midrange bathroom addition is $60,645 with $32,347 of resale value (53.3%); the upscale version costs $111,255 and returns 36.4%. Adding a bath is one of the better-recovering additions.
Zonda, 2025 Cost vs. Value Report8 of 10 Eight of the ten best-returning 2025 projects were exterior replacements
Zonda's 38th Cost vs. Value Report covered 28 projects in 119 markets; 8 of the top 10 returns were exterior jobs and the Pacific and West South Central regions posted the strongest returns overall. Additions rank near the bottom, so plan them for living value.
Zonda / PR Newswire, 38th Annual Cost vs. Value Report release (2025)10 / 10 Added primary bedroom suite earns a perfect Joy Score
NAR's 2025 Remodeling Impact Report gave a perfect 10 Joy Score to added primary suites (alongside kitchen upgrades and new roofing), while Realtors estimated a new primary suite recovers 54% of cost. Happiness, not payback, is the main reason to build one.
National Association of Realtors, 2025 Remodeling Impact Report56% Realtors estimate adding a new bathroom recovers 56% of its cost
In NAR's 2025 report, adding a new bathroom recovered 56% and a new primary suite 54%, compared with 67% for an attic conversion and 71% for a basement conversion. Converting existing space generally beats building new.
National Association of Realtors, 2025 Remodeling Impact Report67% Attic conversion to living area recovers about two-thirds of its cost
NAR's Realtor estimates put attic conversions at 67% cost recovery, ahead of any ground-up addition in the 2025 report. If the roof structure allows it, converting an attic is a cheaper route to a bedroom than a second story.
National Association of Realtors, 2025 Remodeling Impact Report$1,064,000 Median appraised value of California properties with an ADU in 2023 vs $715,000 without
FHFA appraisal data show properties with ADUs appraised at a median $1,064,000 in 2023 versus $715,000 for those without, and grew 9.34% a year since 2013 versus 7.65%. The share of California appraisals with an ADU rose from 1.8% (2016) to about 3% (2022 to 2023).
FHFA, Trends in Median Appraised Value for Properties With Accessory Dwelling Units in California (2024)
Home additions: timelines
2–8 weeks Typical plan review time for a residential addition permit
A 2026 permitting guide reports plan review of two to eight weeks in most jurisdictions, permit fees of roughly $0.15 to $0.85 per square foot (up to about $3,600), permit drawings at $1,200 to $2,100 and $200 to $500 per correction cycle. Build permitting time into the schedule.
CADTRI, Home Addition Permit: Drawings, Costs and Timeline (2026)
Home additions: market size and trends
42% Share of NAHB remodelers who called room additions common in 2025
NAHB's 2025 survey of 22 project types found bathroom remodels most common (73%), with room additions ranked fourth at 42% of remodelers rating them common or very common, ahead of window and door replacement (35%).
NAHB, Top 5 Remodeling Projects in 2025+3% NAHB expects remodeling activity to grow 3% in 2026 and 2% in 2027
NAHB's February 2026 outlook cites an aging housing stock (typical home age 41 years in 2023, up from 31 in 2006), post-pandemic equity gains and mortgage rate lock-in as reasons owners add on instead of moving. 56% of remodelers do aging-in-place work and 73% report rising requests.
NAHB, NAHB Expects Remodeling Growth in 2026 and Beyond55% Share of buyers preferring two primary suites over one
NAHB's What Home Buyers Really Want (2024 edition, 3,000-plus buyers) found 55% would rather have two primary bedroom suites than one, a signal of multigenerational demand; the typical desired home size was 2,067 sq ft. A suite addition matches what buyers say they want.
National Association of Realtors magazine, citing NAHB What Home Buyers Really Want 2024+62 pts Architects: accessory dwellings and rental units lead rising home features
AIA's Q1 2025 Home Design Trends Survey found the share of residential architects reporting accessory dwellings and rental units increasing in popularity exceeded those reporting a decrease by 62 points, up from 57 in 2024. Finished basement or attic space was +29 and micro housing +31.
American Institute of Architects, Home Design Trends Survey Q1 2025+34 pts Architects report additions and alterations as the strongest residential sector
In AIA's Q1 2025 survey, respondents saying the additions and alterations remodeling sector was improving outnumbered those saying weakening by 34 points (up from 14 in 2024), while first-time-buyer new construction was at -32. Owners are adding on rather than moving.
American Institute of Architects, Home Design Trends Survey Q1 20256.8% Share of for-sale listings with an ADU in 2019, up from 1.6% in 2000
Freddie Mac's July 2020 analysis of 600 million MLS records identified 1.4 million single-family properties with ADUs. Homes with ADUs were 4.2% of MLS sales in 2019, and first-time ADU listings grew 8.6% a year from 2009 to 2019. California, Florida, Texas and Georgia hold half of them.
Freddie Mac, Granny Flats, Garage Apartments, In-Law Suites (Economic and Housing Research Insight) (2020)26,924 ADUs permitted in California in 2023, up from 1,336 in 2016
California HCD's ADU Handbook reports annual ADU permits grew 20-fold from 1,336 in 2016 to 26,924 in 2023, and ADUs made up more than 21% of all homes permitted statewide that year. State law now limits local review times and fees for these projects.
California Department of Housing and Community Development, ADU Handbook (2025 update)10% Share of renovating homeowners who built an addition in 2024
The 2025 U.S. Houzz & Home Study found 10% of renovating homeowners expanded their footprint in 2024 (steady since 2022), averaging 3.1 projects each; 2% added on to the kitchen and 2% to a bathroom. Interior remodels (69%) and system upgrades (63%) were far more common. Houzz-user sample.
Houzz, 2025 U.S. Houzz & Home Study27% Homeowners 65+ now account for 27% of improvement spending
Harvard's Improving America's Housing 2025 reports owners 65 and over contributed 27% of improvement outlays in 2023, up from 14% two decades earlier, within a market that peaked at $611 billion in 2022. Aging-in-place suites and first-floor additions ride that demographic shift.
Harvard Joint Center for Housing Studies, Improving America's Housing 2025 press release29.5% Homes over a basement (2024)
29.5% of occupied primary-residence housing units in 2024 (about 39.1M housing units); by region: Northeast 51.6%, Midwest 57.7%, South 12.9%, West 14.2%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)41.1% Basement homes reporting an unfinished basement (2024)
41.1% of homes over a basement in 2024 (about 16.1M housing units); by region: Northeast 52.4%, Midwest 40.7%, South 31.3%, West 26.5%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)39.6% Owner-occupied homes over a basement (2024)
39.6% of owner-occupied primary residences in 2024 (about 35.5M housing units); by region: Northeast 74.4%, Midwest 73.5%, South 16.8%, West 19.5%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)47.6% Homes with an attic (2024)
47.6% of occupied primary-residence housing units in 2024 (about 63.1M housing units); by region: Northeast 40.5%, Midwest 49.5%, South 55.3%, West 38.0%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)85.6% Attic homes reporting an unfinished attic (2024)
85.6% of homes with an attic in 2024 (about 54.0M housing units); by region: Northeast 82.8%, Midwest 88.3%, South 84.0%, West 88.7%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)14.4% Attic homes reporting a finished attic (2024)
14.4% of homes with an attic in 2024 (about 9.1M housing units); by region: Northeast 17.1%, Midwest 11.7%, South 15.9%, West 11.3%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)38.6% Homes with exactly one full bathroom (2024)
38.6% of occupied primary-residence housing units in 2024 (about 51.2M housing units); by region: Northeast 56.1%, Midwest 45.0%, South 30.3%, West 33.3%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)46.8% Homes with exactly two full bathrooms (2024)
46.8% of occupied primary-residence housing units in 2024 (about 62.0M housing units); by region: Northeast 35.3%, Midwest 41.5%, South 53.0%, West 49.9%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)11.8% Homes with exactly three full bathrooms (2024)
11.8% of occupied primary-residence housing units in 2024 (about 15.6M housing units); by region: Northeast 7.3%, Midwest 11.4%, South 12.8%, West 13.8%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)30.3% Homes with at least one half bathroom (2024)
30.3% of occupied primary-residence housing units in 2024 (about 40.2M housing units); by region: Northeast 33.6%, Midwest 33.6%, South 29.3%, West 26.4%. Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026).
Addition Scope analysis of EIA 2024 RECS preliminary household microdata (May 2026)
Home additions: behavior and choices
25% One in four homeowners 50+ would consider building an ADU
AARP's 2024 Home and Community Preferences Survey (3,090 adults, summer 2024) found 25% of older homeowners would consider an accessory dwelling unit, and 55% of them cite giving a loved one who needs care a place to live. 75% of older adults want to stay in their current home.
AARP, 2024 Home and Community Preferences Survey33% One in three adults expects to provide care in their own home
AARP's 2024 survey found 13% of adults are current caregivers, 34% expect to be, and 33% expect to give that care in their own home. In-law suites and ADUs are the housing response to that expectation.
AARP, 2024 Home and Community Preferences Survey1 in 3 Nearly one in three U.S. adults would consider building an ADU
AARP's Livability Index brief (April 2022) reports nearly one in three adults would consider an ADU on their property, most often so a loved one needing care has a place to stay. Nine states plus D.C. had enacted statewide ADU laws at the time.
AARP Public Policy Institute, The New AARP Livability Index: ADUs Provide Possibilities (2022)18% Share of Americans living in multigenerational households (2021)
Pew Research found 59.7 million people, 18% of the U.S. population, lived in multigenerational homes in March 2021, up from 7% in 1971. Finances are the top reason, and about a third cite caregiving. 57% of adults in these homes call the experience positive.
Pew Research Center, Financial Issues Top the List of Reasons U.S. Adults Live in Multigenerational Homes (2022)31% Nearly a third of 25- to 29-year-olds live in a multigenerational home
Pew's demographic analysis shows multigenerational living is highest among adults 25 to 29 (31%) and 30 to 34 (19%). Adult children boomeranging home is a major driver of suite additions and garage conversions.
Pew Research Center, The Demographics of Multigenerational Households (2022)32% Share of non-ADU owners interested in adding one
Freddie Mac's November 2022 survey of 2,500 consumers found 71% were unfamiliar with ADUs, yet 32% of those without one were interested; top reasons were hosting visitors (37%) and renting to tenants (33%). Awareness, not demand, is the gap.
Freddie Mac, ADUs Can Increase Housing Stock, But Most Are Unfamiliar (2023)18% Secured home loans fund 18% of $50,000–$200,000 renovations
Houzz's 2025 study shows cash from savings funds 81% of large projects, secured loans such as HELOCs 18% (three times the 6% rate on small projects), cash from a home sale 19% and credit cards 26%. Addition budgets usually blend equity borrowing with savings. Houzz-user sample.
Houzz, 2025 U.S. Houzz & Home Study74% Share of recent buyers planning to stay in their home at least two more years
TD Bank's August 2025 survey of 2,012 homeowners found 74% plan to stay put, 66% are renovating or planning to within two years, and 53% of those with a HELOC or home equity loan used it for renovations. Rate lock-in is pushing owners to add space instead of trading up.
TD Bank, Homeowners Are Staying Put and Tapping Equity Products survey (2025)46% Share of home equity borrowers citing renovations as the reason (2024)
The Mortgage Bankers Association's 2025 Home Equity Lending Study, as reported by National Mortgage Professional, found 46% of borrowers applied for a home equity loan or HELOC to fund renovations in 2024, down from 65% in 2022 as debt consolidation grew. Equity remains the main financing route for six-figure additions.
Mortgage Bankers Association, 2025 Home Equity Lending Study (via National Mortgage Professional)14.6 pts Unfinished-basement gap, owner homes built before 1990 vs 1990–2024
Addition Scope's weighted analysis of the EIA's 2024 household survey microdata: Basement homes built before 1990 44.0% versus Basement homes built in 1990–2024 29.4% (a 14.6-point gap). Potential finishing research should distinguish existing condition from structural feasibility and purchase intent.
Addition Scope analysis of EIA 2024 RECS household data29.7 pts One-bathroom gap between homes built before 1990 and 1990–2024
Addition Scope's weighted analysis of the EIA's 2024 household survey microdata: owner-occupied homes built before 1990 36.6% versus owner-occupied homes built in 1990–2024 7.0% (a 29.7-point gap). One-bath households may need different disruption planning; the data do not measure remodeling intent.
Addition Scope analysis of EIA 2024 RECS household data-3.5 pts Unfinished-attic gap between homes built before 1990 and 1990–2024
Addition Scope's weighted analysis of the EIA's 2024 household survey microdata: Attic homes built before 1990 84.9% versus Attic homes built in 1990–2024 88.4% (a -3.5-point gap). Unfinished attic space is not necessarily occupiable or convertible.
Addition Scope analysis of EIA 2024 RECS household data54% Renovated in 2025 (2025 activity; 2026 plans)
The 2026 U.S. Houzz & Home Study surveyed homeowners on Houzz about their 2025 projects and 2026 plans; 54% renovated in 2025 and 50% plan to renovate in 2026.
2026 U.S. Houzz & Home Study52% Decorated in 2025 (2025 activity; 2026 plans)
The 2026 U.S. Houzz & Home Study surveyed homeowners on Houzz about their 2025 projects and 2026 plans; 52% decorated in 2025, alongside 54% who renovated and 47% who made repairs.
2026 U.S. Houzz & Home Study47% Repaired in 2025 (2025 activity; 2026 plans)
The 2026 U.S. Houzz & Home Study surveyed homeowners on Houzz about their 2025 projects and 2026 plans; 47% made repairs in 2025, while 54% renovated and 52% decorated.
2026 U.S. Houzz & Home Study50% of surveyed Houzz homeowners plan to renovate in 2026
The 2026 U.S. Houzz & Home Study found 54% of surveyed homeowners renovated in 2025 and 50% plan to renovate in 2026. Stated intent, from a Houzz platform sample.
2026 U.S. Houzz & Home Study71% Prioritized preventative maintenance (April 15-16, 2025)
Angi's 2025 Home Spending Pulse surveyed homeowners who had hired a pro in the previous year (fielded April 15–16, 2025). 71% said they were putting preventive maintenance first.
Angi 2025 Home Spending Pulse29% Bundled repairs (April 15-16, 2025)
Angi's 2025 Home Spending Pulse surveyed homeowners who had hired a pro in the previous year (fielded April 15–16, 2025). 29% bundled several repairs into one visit.
Angi 2025 Home Spending Pulse19% Selected cheaper materials/services (April 15-16, 2025)
Angi's 2025 Home Spending Pulse surveyed homeowners who had hired a pro in the previous year (fielded April 15–16, 2025). 19% chose cheaper materials or services.
Angi 2025 Home Spending Pulse23% Started early before price rises (April 15-16, 2025)
Angi's 2025 Home Spending Pulse surveyed homeowners who had hired a pro in the previous year (fielded April 15–16, 2025). 23% started a project early before expected price rises.
Angi 2025 Home Spending Pulse62% Increased maintenance-affordability concern (April 15-16, 2025)
Angi's 2025 Home Spending Pulse surveyed homeowners who had hired a pro in the previous year (fielded April 15–16, 2025). 62% reported growing concern about affording home maintenance.
Angi 2025 Home Spending Pulse
Home additions: regional differences
57.7% Share of Midwest homes that sit over a basement (2024)
EIA's 2024 RECS microdata put 16.4 million Midwest occupied homes over a basement, 57.7% of the region's stock, against 51.6% in the Northeast, 14.2% in the West and 12.9% in the South. Nationally 29.5% of occupied homes have a basement. Installed stock, not projects.
EIA, 2024 RECS preliminary household microdata (May 2026)56.1% Share of Northeast homes with exactly one full bathroom (2024)
EIA's 2024 RECS microdata put 12.9 million Northeast occupied homes at exactly one full bathroom, 56.1% of the region's stock, against 45.0% in the Midwest, 33.3% in the West and 30.3% in the South. The older Northeast stock is where bathroom additions and suites lead. Installed stock.
EIA, 2024 RECS preliminary household microdata (May 2026)
State by state: homes with only one full bathroom; attics left unfinished; homes built over a basement
Homes with only one full bathroom: 38.6% nationally. Highest in Rhode Island (61.5%), New York (60.4%), District of Columbia (58.8%); lowest in Arizona (20.6%), Nevada (22%), Florida (22%).
Attics left unfinished: 85.6% nationally. Highest in Colorado (94.8%), Wisconsin (94.8%), Rhode Island (93.8%); lowest in Mississippi (79.2%), Louisiana (79.9%), North Carolina (80.3%).
Homes built over a basement: 42.9% nationally. Highest in Connecticut (91.7%), Massachusetts (91.2%), Nebraska (91.1%); lowest in Arizona (3%), Arkansas (7.2%), California (7.9%).
Addition Scope calculated these state estimates from the Energy Information Administration's 2024 household survey microdata. EIA publishes the 2024 survey nationally and by region, not by state. Shares are weighted; a dash means the state sample was too small for a reliable estimate (fewer than 100 households, fewer than 10 yes answers, or a relative standard error above 30%). Source data.
| State | Homes with only one full bathroom | Attics left unfinished | Homes built over a basement |
|---|---|---|---|
| United States | 38.6% | 85.6% | 42.9% |
| Alabama | 30.4% | 81.7% | 16.3% |
| Alaska | 45.4% | — | 24.8% |
| Arizona | 20.6% | 90.5% | 3% |
| Arkansas | 37.4% | 80.4% | 7.2% |
| California | 36.8% | 86.6% | 7.9% |
| Colorado | 31.1% | 94.8% | 66.6% |
| Connecticut | 53.3% | 86.3% | 91.7% |
| Delaware | 33% | — | 56.9% |
| District of Columbia | 58.8% | — | 83.2% |
| Florida | 22% | 91.1% | — |
| Georgia | 24.8% | 84.2% | 25.8% |
| Hawaii | 40.5% | — | — |
| Idaho | 24.8% | 93.5% | 30.9% |
| Illinois | 43.4% | 89.3% | 77.5% |
| Indiana | 48.4% | 84.1% | 49.8% |
| Iowa | 40.5% | 88.2% | 88% |
| Kansas | 41.9% | — | 72.3% |
| Kentucky | 37.8% | 89.4% | 49.8% |
| Louisiana | 33.3% | 79.9% | — |
| Maine | 57.2% | — | 82% |
| Maryland | 33.4% | 84.3% | 76.5% |
| Massachusetts | 57.2% | 83.9% | 91.2% |
| Michigan | 47.9% | 91% | 86% |
| Minnesota | 35.6% | — | 85.8% |
| Mississippi | 32.9% | 79.2% | — |
| Missouri | 42.3% | 90.1% | 75.2% |
| Montana | 37.9% | 89.9% | 60.9% |
| Nebraska | 37% | 89.8% | 91.1% |
| Nevada | 22% | 88.6% | — |
| New Hampshire | 51.1% | 86.2% | 91.1% |
| New Jersey | 50.8% | 81.6% | 71.3% |
| New Mexico | 30.4% | — | — |
| New York | 60.4% | 81.8% | 85.1% |
| North Carolina | 30.6% | 80.3% | 20.6% |
| North Dakota | 36.1% | 90% | 88.3% |
| Ohio | 49.5% | 83.3% | 76.6% |
| Oklahoma | 37.2% | 85.4% | 8.4% |
| Oregon | 39% | 90.1% | 21.9% |
| Pennsylvania | 53.7% | 81.3% | 89.8% |
| Rhode Island | 61.5% | 93.8% | 90.5% |
| South Carolina | 25.2% | 87% | — |
| South Dakota | 36.7% | — | 85.9% |
| Tennessee | 35% | 81.8% | 29.7% |
| Texas | 31.7% | 82.4% | — |
| Utah | 26.1% | — | 74.9% |
| Vermont | 51.3% | — | 88.6% |
| Virginia | 33.2% | 83.1% | 48.8% |
| Washington | 35.1% | 85.1% | 34.3% |
| West Virginia | 43.4% | — | 64% |
| Wisconsin | 51.3% | 94.8% | 90.1% |
| Wyoming | 37% | 92.7% | 65.1% |
U.S. housing data by region
How many existing homes already have the features that shape a home additions project, nationally and in each census region. Addition Scope weighted these from the federal survey records; counts are rounded.
Homes that already have it (EIA)
| Measure | U.S. | Northeast | Midwest | South | West | Source |
|---|---|---|---|---|---|---|
| Homes over a basement2024 · occupied primary-residence housing units | 29.5% | 51.6% | 57.7% | 12.9% | 14.2% | U.S. Energy Information Administration |
| Basement homes reporting an unfinished basement2024 · homes over a basement | 41.1% | 52.4% | 40.7% | 31.3% | 26.5% | U.S. Energy Information Administration |
| Owner-occupied homes over a basement2024 · owner-occupied primary residences | 39.6% | 74.4% | 73.5% | 16.8% | 19.5% | U.S. Energy Information Administration |
| Homes with an attic2024 · occupied primary-residence housing units | 47.6% | 40.5% | 49.5% | 55.3% | 38.0% | U.S. Energy Information Administration |
| Attic homes reporting an unfinished attic2024 · homes with an attic | 85.6% | 82.8% | 88.3% | 84.1% | 88.7% | U.S. Energy Information Administration |
| Attic homes reporting a finished attic2024 · homes with an attic | 14.4% | 17.1% | 11.7% | 15.9% | 11.3% | U.S. Energy Information Administration |
Rooms and layout in existing homes (EIA)
| Measure | U.S. | Northeast | Midwest | South | West | Source |
|---|---|---|---|---|---|---|
| Homes with exactly one full bathroom2024 · occupied primary-residence housing units | 38.6% | 56.1% | 45.0% | 30.3% | 33.3% | U.S. Energy Information Administration |
| Homes with exactly two full bathrooms2024 · occupied primary-residence housing units | 46.8% | 35.3% | 41.5% | 53.0% | 49.9% | U.S. Energy Information Administration |
| Homes with exactly three full bathrooms2024 · occupied primary-residence housing units | 11.8% | 7.3% | 11.4% | 12.8% | 13.8% | U.S. Energy Information Administration |
| Homes with at least one half bathroom2024 · occupied primary-residence housing units | 30.3% | 33.6% | 33.6% | 29.3% | 26.4% | U.S. Energy Information Administration |
Remodeling behavior (surveys)
- 54% Renovated in 2025 (2025 activity; 2026 plans, Surveyed homeowners on Houzz). 2026 U.S. Houzz & Home Study
- 52% Decorated in 2025 (2025 activity; 2026 plans, Surveyed homeowners on Houzz). 2026 U.S. Houzz & Home Study
- 47% Repaired in 2025 (2025 activity; 2026 plans, Surveyed homeowners on Houzz). 2026 U.S. Houzz & Home Study
- 50% Plan renovation in 2026 (2025 activity; 2026 plans, Surveyed homeowners on Houzz). 2026 U.S. Houzz & Home Study
- 71% Postponed a project (April 15-16, 2025, Surveyed homeowners who hired a pro in previous year). Angi 2025 Home Spending Pulse
- 71% Prioritized preventative maintenance (April 15-16, 2025, Surveyed homeowners who hired a pro in previous year). Angi 2025 Home Spending Pulse
- 29% Bundled repairs (April 15-16, 2025, Surveyed homeowners who hired a pro in previous year). Angi 2025 Home Spending Pulse
- 19% Selected cheaper materials/services (April 15-16, 2025, Surveyed homeowners who hired a pro in previous year). Angi 2025 Home Spending Pulse
- 23% Started early before price rises (April 15-16, 2025, Surveyed homeowners who hired a pro in previous year). Angi 2025 Home Spending Pulse
- 62% Increased maintenance-affordability concern (April 15-16, 2025, Surveyed homeowners who hired a pro in previous year). Angi 2025 Home Spending Pulse
How Addition Scope compiles these figures
Published figures come from Angi, Zonda, Zonda / PR Newswire, National Association of Realtors, HomeAdvisor, CADTRI, HomeLight, HomeGuide and other named sources, each linked where it appears. Housing data by region is Addition Scope's weighted tabulation of the EIA's 2024 Residential Energy Consumption Survey public microdata, using the survey's own weights and 60 replicate weights for the intervals, and of the Census Bureau's Characteristics of New Housing tables. Figures describe the period and population shown next to each one.
Homeowner polls
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What problem is the added space meant to solve?
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What all-in budget are you planning, including design and permits?
Angi's 2026 typical range is $21,891 to $83,356; Zonda's midrange primary suite is $170,517.
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Home additions statistics: quick answers
What share of U.S. homes are built over a basement?
29.5% nationally in 2024 (about 39.1M housing units), based on Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026). The share is highest in the Midwest at 57.7% and lowest in the South at 12.9%. The figure covers occupied primary-residence housing units.
Among basement homes, what share report an unfinished basement?
41.1% nationally in 2024 (about 16.1M housing units), based on Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026). The share is highest in the Northeast at 52.4% and lowest in the West at 26.5%. The figure covers homes over a basement.
What share of owner-occupied homes are over a basement?
39.6% nationally in 2024 (about 35.5M housing units), based on Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026). The share is highest in the Northeast at 74.4% and lowest in the South at 16.8%. The figure covers owner-occupied primary residences.
What share of U.S. homes have an attic?
47.6% nationally in 2024 (about 63.1M housing units), based on Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026). The share is highest in the South at 55.3% and lowest in the West at 38.0%. The figure covers occupied primary-residence housing units.
Among attic homes, what share report an unfinished attic?
85.6% nationally in 2024 (about 54.0M housing units), based on Addition Scope's weighted analysis of EIA 2024 RECS preliminary household microdata (May 2026). The share is highest in the West at 88.7% and lowest in the Northeast at 82.8%. The figure covers homes with an attic.
Is unfinished-basement prevalence different in older and newer owner-occupied homes?
Older houses are far more likely to have a basement that was never finished. If your home predates 1990, the basement is probably raw space with the most room to add living area, and also the most likely to need moisture and egress work first. Addition Scope calculated this from the federal government's 2024 household survey data: owner-occupied basement homes built before 1990 44.0% versus owner-occupied basement homes built in 1990–2024 29.4%.
How does one-bathroom prevalence differ by house age?
Older homes are much more likely to have a single full bathroom. That is why a second bath is one of the most common additions in pre-1990 houses, and why plumbing access decides the price. Addition Scope calculated this from the federal government's 2024 household survey data: owner-occupied homes built before 1990 36.6% versus owner-occupied homes built in 1990–2024 7.0%.
How does unfinished-attic prevalence vary by house age?
Unfinished attics are more common in older houses. If you're short on space, the attic can be cheaper to convert than an addition, provided headroom, stairs and floor strength work. Addition Scope calculated this from the federal government's 2024 household survey data: owner-occupied attic homes built before 1990 84.9% versus owner-occupied attic homes built in 1990–2024 88.4%.
Put the numbers to work
Free toolHome addition cost calculatorSize, material tier and complexity in, a realistic budget range out.
Free toolAddition comparisons: out versus up, conversion versus new buildSide-by-side tables for the decisions that change the price most.
Free toolAddition feasibility quiz: do you know what decides your project?9 questions that show what you already know and what to check next.
Free toolAddition polls: what other planners chose, feared and cutSee what other planners chose and add your vote.
Service guides
Service guideRoom AdditionsA room addition builds new ground-floor space on its own foundation, tied into the existing walls and roof, to add a bedroom, family room, kitchen extension, bathroom or primary suite.
Service guideSecond Story AdditionsA second-story addition builds a new floor on top of an existing house, either over the whole footprint or over part of it, after an engineer confirms the foundation and walls can carry the load.
Service guideADU & Garage ConversionsAn accessory dwelling unit is a second, self-contained living space on a single-family lot, built by converting a garage or basement, adding onto the house, or constructing a detached unit.
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