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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
44309, Akron, Ohio - November 14, 2022

Building a Sunroom

$83.00 to $119.00 per square foot (three-season room)
This quote is a ballpark figure for sunroom construction. This estimate price accounts for 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 insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Akron 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
93001, Ventura, California - January 18, 2023

Building a Closet

$1,937.47 to $2,120.77 for standard bedroom closet (4 ft reach-in)
Price considers labor for closet building. Estimate accounts for framing walls and hanging drywall to add a closet to an existing room (4 ft wide). No shelving systems, storage solutions, cabinets, lighting, or larger closets included.

Reported by:
ProMatcher Research Team
See the Ventura 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
32802, Orlando, Florida - November 14, 2022

Building a Sunroom

$81.17 to $116.38 per square foot (three-season room)
This quote is a ballpark figure for sunroom construction. This estimate price accounts for 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 Orlando 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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