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Home Additions Costs & Prices - ProMatcher Cost Report

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Home Additions Costs & Prices


We have collected data nationwide to help calculate the average cost of home additions in the US. The following are average costs and prices reported back to us:

Cost of Building a Home Addition

$115.02 per square foot for standard grade construction (Range: $88.87 - $141.16)
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Cost of Building a Garage Addition

$41.82 per square foot (custom designed, standard grade) (Range: $36.59 - $47.05)
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Cost of Building a Sunroom

$108.09 per square foot (three-season room) (Range: $88.82 - $127.35)
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Cost of Dormer Addition

$3,267.12 for single-window gable dormer (Range: $3,094.61 - $3,439.62)
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Cost of Home Remodeling

$66.21 per square foot (Range: $38.74 - $93.67)
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Cost of Building a Closet

$1,614.51 for standard bedroom closet (4 ft reach-in) (Range: $1,541.58 - $1,687.43)
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 Addition to House - Build
 Garage - Build
 Sunroom - Build
 Dormer - Addition
 Remodeling - One or More Rooms
 Closet - Build

Home Additions Cost Checklist

Building a Garage Addition Cost Checklist
When evaluating a garage addition cost estimate from a local contractor, make certain the estimate contains everything you want done. Here is a checklist of items you may want to consider:

- Are they going to “stick build” it (which means construct it onsite) or is it going to be a pre-packaged modular structure?

- Are they preparing or providing construction drawings (blueprints)?

- How do they plan on preparing the site for construction? Do they need to grade, fill, or compact the site?

- Are they going to do a soils test?

- What kind of foundation are they installing (concrete or aggregate).

- Are they going to be responsible for pulling permits?

- What type of garage door are they installing? Are they installing a garage door opener? If so, what kind?

- Will the garage have windows? If so, what kind (vinyl, wood)?

- What type and grade of roofing material are they installing?

- What type and grade of siding are they using (vinyl, wood, composite)?

- Will the interior be finished or unfinished?

- Are they installing any type of security system?

If you are interested in hiring a garage contractor, we can point you in the right direction. Learn more about hiring contractors and get a free garage cost estimate.

Home Additions Cost Factors

Cost of Building a Home Addition

Learn more about the factors that impact the cost of a home addition, including your geographic location and the quality of materials chosen.

Find Costs & Prices in Your City


Home Additions Cost Data

98266, Maple Falls, Washington - May 30, 2025

Building a Home Addition

$225.00 to $275.00 per square foot for premium grade construction
$150.00 to $175.00 per square foot for standard grade construction
I charge this price to handle the plans and permits, inspections, you just got to decide how big you want to go and let me and my team handle the rest we work with some amazing architects have a stellar reputation with inspectors. I provide tons of pics of the job same day work order estimates a 1 year warranty on all work if anything fails in the first year its free to get it fixed. We want your great grand kids to enjoy the addition as well we strive for perfection and work till we are that's why we give ourselves an entire year to make sure we are. lol.

Reported by:
Deborah Weston, Home Pros
See the Maple Falls Home Additions Cost Report
44309, Akron, Ohio - May 16, 2021

Building a Garage Addition

$35.00 to $45.00 per square foot (custom designed, standard grade)
This estimate includes garage construction. Cost does include standard materials and project cleanup. The estimate excludes blueprint preparation.

Reported by:
ProMatcher Research Team
See the Akron Home Additions Cost Report
79604, Abilene, Texas - November 14, 2022

Building a Sunroom

$75.78 to $108.65 per square foot (three-season room)
This quote is a ballpark figure for sunroom installation. This should cover building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Extra fees may apply for insulating materials, heating and air conditioning work, and permitting .

Reported by:
ProMatcher Research Team
See the Abilene Home Additions Cost Report
35401, Tuscaloosa, Alabama - October 29, 2020

Dormer Addition

$2,800.16 to $3,112.34 for single-window gable dormer
Estimate includes dormer addition construction. Cost does include framing, roofing, and finishing a gable dormer with a single window. Additional charge for larger dormers, electrical work or plumbing services, permit inspection fees, dormers for hip roofs, and interior space renovations.

Reported by:
ProMatcher Research Team
See the Tuscaloosa Home Additions Cost Report
28209, Charlotte, North Carolina - March 23, 2025

Home Remodeling

$75.00 to $200.00 per square foot


Reported by:
ProMatcher Research Team
See the Charlotte Home Additions Cost Report
94188, San Francisco, California - January 18, 2023

Building a Closet

$2,362.42 to $2,585.92 for standard bedroom closet (4 ft reach-in)
Price quote considers the cost of closet building. Items included: framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Cost excludes shelving systems, storage solutions, cabinets, lighting, or larger closets.

Reported by:
ProMatcher Research Team
See the San Francisco Home Additions Cost Report
46219, Indianapolis, Indiana - March 23, 2025

Building a Home Addition

$225.00 to $350.00 per square foot for premium grade construction
$150.00 to $200.00 per square foot for standard grade construction


Reported by:
ProMatcher Research Team
See the Indianapolis Home Additions Cost Report
67401, Salina, Kansas - May 16, 2021

Building a Garage Addition

$30.42 to $39.11 per square foot (custom designed, standard grade)
Estimated quote takes into account the price of garage construction. Also includes standard materials and project cleanup. Estimate does not account for blueprint preparation.

Reported by:
ProMatcher Research Team
See the Salina Home Additions Cost Report
31701, Albany, Georgia - November 14, 2022

Building a Sunroom

$74.78 to $107.22 per square foot (three-season room)
This quote is a ballpark figure for sunroom installation. This should cover standard three-season room addition with builder-grade materials (windows, siding, and roofing) and standard electrical work. Extra fees may apply for installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.

Reported by:
ProMatcher Research Team
See the Albany Home Additions Cost Report
87401, Farmington, New Mexico - October 29, 2020

Dormer Addition

$2,871.20 to $3,191.30 for single-window gable dormer
Includes pricing for dormer addition construction. Cost takes into account framing, roofing, and finishing a gable dormer with a single window. Excludes larger dormers, electrical work or plumbing services, permit inspection fees, dormers for hip roofs, and interior space renovations.

Reported by:
ProMatcher Research Team
See the Farmington Home Additions Cost Report
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Disclaimer: Costs and prices shown on the ProMatcher site are intended to be used as general information, not as guaranteed estimates. To obtain cost information relevant to your project, request a quote or estimate from a local service provider.
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