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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

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
62521, Decatur, Illinois - May 16, 2021

Building a Garage Addition

$31.99 to $41.13 per square foot (custom designed, standard grade)
Manhours for building a garage addition are included. Estimate includes standard materials and waste removal. However, it does not include design drawings.

Reported by:
ProMatcher Research Team
See the Decatur 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
33901, Fort Myers, Florida - October 29, 2020

Dormer Addition

$2,829.76 to $3,145.24 for single-window gable dormer
Price range takes into account dormer addition construction labor. Does include framing, roofing, and finishing a gable dormer with a single window. Cost does not include 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 Fort Myers 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
36582, Theodore, Alabama - February 3, 2025

Building a Home Addition

$150.00 to $200.00 per square foot for premium grade construction
$80.00 to $110.00 per square foot for standard grade construction


Reported by:
ProMatcher Research Team
See the Theodore Home Additions Cost Report
01613, Worcester, Massachusetts - May 16, 2021

Building a Garage Addition

$44.42 to $57.11 per square foot (custom designed, standard grade)
Estimated quote includes labor for garage construction. No additional charge for standard materials and project cleanup. Cost estimate excludes blueprint preparation.

Reported by:
ProMatcher Research Team
See the Worcester Home Additions Cost Report
12210, Albany, New York - November 14, 2022

Building a Sunroom

$89.72 to $128.64 per square foot (three-season room)
This quote is a ballpark figure for sunroom installation. This should cover adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Extra fees may apply for insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Albany Home Additions Cost Report
64052, Independence, Missouri - October 29, 2020

Dormer Addition

$2,823.84 to $3,138.66 for single-window gable dormer
The cost of window dormer installation is included in the estimate. Price takes into account standard-grade materials and supplies to build gable dormer with one average-sized window. Items excluded: room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .

Reported by:
ProMatcher Research Team
See the Independence 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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