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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

$190.63 per square foot for premium grade construction (Range: $155.25 - $226.00)
$116.69 per square foot for standard grade construction (Range: $90.40 - $142.98)
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

$74.81 per square foot (Range: $56.83 - $92.78)
Free Estimates from Local Pros

Cost of Building a Closet

$1,576.05 for standard bedroom closet (4 ft reach-in) (Range: $1,503.92 - $1,648.18)
$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

12764, Narrowsburg, New York - December 7, 2019

Building a Home Addition

$150.00 to $200.00 per square foot for premium grade construction
$100.00 to $150.00 per square foot for standard grade construction


Reported by:
ProMatcher Research Team
See the Narrowsburg 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
70826, Baton Rouge, Louisiana - January 3, 2018

Building a Sunroom

$74.00 to $104.75 per square foot (three-season room)
Includes manhours for sunroom construction. Cost takes into account building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Additional charge for insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Baton Rouge Home Additions Cost Report
24112, Martinsville, Virginia - March 20, 2018

Dormer Addition

$2,578.16 to $2,865.59 for single-window gable dormer
Manhours for window dormer installation are included in this estimate. Price includes standard-grade materials and supplies to build gable dormer with one average-sized window. Excludes room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .

Reported by:
ProMatcher Research Team
See the Martinsville Home Additions Cost Report
33542, Zephyrhills, Florida - March 28, 2019

Home Remodeling

$5.00 to $9.00 per square foot
We bill according to the amount of work needed to complete the job correctly, as well as the materials costs incurred. Per square foot price may exceed $9 depending on customer choices.

Reported by:
Brett Weeks, Repair-n-Stuff LLC
See the Zephyrhills Home Additions Cost Report
30014, Covington, Georgia - June 4, 2019

Building a Closet

$1,500.00 to $5,000.00 for typical walk-in closet (approx. 9'x9')
We price per project, dependent on the amount of material needed to complete the project. We fully customize the project to suit your needs as well as your wallet.

Reported by:
Joel McDaniel, Atlanta Cabinets & Furniture
See the Covington Home Additions Cost Report
77598, Webster, Texas - October 28, 2019

Building a Home Addition

$125.00 to $192.00 per square foot for premium grade construction
$100.75 to $121.37 per square foot for standard grade construction


Reported by:
ProMatcher Research Team
See the Webster Home Additions Cost Report
38305, Jackson, Tennessee - April 20, 2018

Building a Garage Addition

$31.57 to $40.59 per square foot (custom designed, standard grade)
Labor for building a garage addition is included in the price. Accounts for cost of standard grade materials and debris removal Cost does not account for design drawings.

Reported by:
ProMatcher Research Team
See the Jackson Home Additions Cost Report
74361, Pryor, Oklahoma - January 3, 2018

Building a Sunroom

$65.07 to $92.11 per square foot (three-season room)
This estimated cost includes sunroom installation labor. Price estimate includes adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Items excluded: installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.

Reported by:
ProMatcher Research Team
See the Pryor Home Additions Cost Report
28401, Wilmington, North Carolina - March 20, 2018

Dormer Addition

$2,924.48 to $3,250.52 for single-window gable dormer
This dormer addition construction estimate takes into account labor. Includes framing, roofing, and finishing a gable dormer with a single window. Price estimate 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 Wilmington 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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