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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

$192.34 per square foot for premium grade construction (Range: $155.36 - $229.31)
$117.06 per square foot for standard grade construction (Range: $90.71 - $143.40)
Free Estimates from Local Pros

Cost of Building a Garage Addition

$41.80 per square foot (custom designed, standard grade) (Range: $36.54 - $47.05)
$28.80 per square foot (pre-designed kits and packages) (Range: $23.20 - $34.40)
Free Estimates from Local Pros

Cost of Building a Sunroom

$7,500.00 fixed-fee for 10'x10' three-season room (Range: $5,750.00 - $9,250.00)
$80.00 per square foot (four-season room) (Range: $75.00 - $85.00)
$97.17 per square foot (three-season room) (Range: $80.47 - $113.87)
Free Estimates from Local Pros

Cost of Dormer Addition

$3,267.12 for single-window gable dormer (Range: $3,094.61 - $3,439.62)
Free Estimates from Local Pros

Cost of Home Remodeling

$69.62 per square foot (Range: $50.14 - $89.09)
Free Estimates from Local Pros

Cost of Building a Closet

$1,613.49 for standard bedroom closet (4 ft reach-in) (Range: $1,539.86 - $1,687.12)
$3,125.00 for typical walk-in closet (approx. 9'x9') (Range: $2,000.00 - $4,250.00)
Free Estimates from Local Pros
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Home Addition Contractors
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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

90703, Cerritos, California - July 7, 2020

Building a Home Addition

$190.00 to $285.00 per square foot for premium grade construction
$150.00 to $265.00 per square foot for standard grade construction


Reported by:
ProMatcher Research Team
See the Cerritos Home Additions Cost Report
48380, Milford, Michigan - June 5, 2018

Building a Garage Addition

$45.00 to $65.00 per square foot (custom designed, standard grade)
$45.00 to $55.00 per square foot (pre-designed kits and packages)
Depending upon the size of the contract, usually 4 payments.

Reported by:
Terry Adams, Park Builders Inc.
See the Milford Home Additions Cost Report
29020, Camden, South Carolina - January 3, 2018

Building a Sunroom

$75.00 to $106.17 per square foot (three-season room)
Manhours for sunroom construction are included in cost. Estimate includes building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Items excluded: insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Camden Home Additions Cost Report
67846, Garden City, Kansas - March 20, 2018

Dormer Addition

$2,655.12 to $2,951.13 for single-window gable dormer
Labor is included in this dormer addition construction estimate. Price accounts for 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 Garden City Home Additions Cost Report
40769, Williamsburg, Kentucky - April 1, 2020

Home Remodeling

$15.00 to $60.00 per square foot


Reported by:
ProMatcher Research Team
See the Williamsburg Home Additions Cost Report
01453, Leominster, Massachusetts - January 27, 2020

Building a Closet

$1,488.04 to $1,628.81 for standard bedroom closet (4 ft reach-in)
Cost includes labor for closet installation. Also includes wall framing, drywall installation, and builder-grade finishes (rod, door, hinges, etc.). Items not included: built-in shelving, custom organization systems, and walk-in closets.

Reported by:
ProMatcher Research Team
See the Leominster Home Additions Cost Report
95340, Merced, California - June 30, 2020

Building a Home Addition

$86.00 to $170.00 per square foot for premium grade construction
$65.00 to $130.00 per square foot for standard grade construction
T&M 2 hrs minimum

Reported by:
Rick Bonner, A BONNER ELECTRIC
See the Merced Home Additions Cost Report
14240, Buffalo, New York - April 20, 2018

Building a Garage Addition

$33.53 to $43.11 per square foot (custom designed, standard grade)
Includes pricing for building a garage addition. Cost takes into account standard grade materials and debris removal. Excludes design drawings.

Reported by:
ProMatcher Research Team
See the Buffalo Home Additions Cost Report
22802, Harrisonburg, Virginia - January 3, 2018

Building a Sunroom

$74.69 to $105.73 per square foot (three-season room)
Price considers the cost of sunroom construction. Estimate includes standard three-season room addition with builder-grade materials (windows, siding, and roofing) and standard electrical work. Does not include insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Harrisonburg Home Additions Cost Report
77515, Angleton, Texas - March 20, 2018

Dormer Addition

$2,643.28 to $2,937.97 for single-window gable dormer
Cost estimate considers the price of dormer addition construction. Price accounts for cutting into an existing roof, framing structure, installing window, re-roofing, and re-siding. 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 Angleton 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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