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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

$186.46 per square foot for premium grade construction (Range: $153.96 - $218.96)
$116.36 per square foot for standard grade construction (Range: $89.96 - $142.75)
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

$91.25 per square foot (Range: $71.50 - $111.00)
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)
$3,000.00 for typical walk-in closet (approx. 9'x9') (Range: $2,500.00 - $3,500.00)
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

79711, Midland, Texas - August 31, 2018

Building a Home Addition

$81.00 to $115.00 per square foot for premium grade construction
$60.00 to $80.00 per square foot for standard grade construction


Reported by:
ProMatcher Research Team
See the Midland 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
01702, Framingham, Massachusetts - January 3, 2018

Building a Sunroom

$103.57 to $146.61 per square foot (three-season room)
Cost estimate considers the price of sunroom construction. Price accounts for 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 Framingham Home Additions Cost Report
01613, Worcester, Massachusetts - March 20, 2018

Dormer Addition

$3,756.24 to $4,175.01 for single-window gable dormer
Includes necessary manhours. Cost also includes 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 Worcester Home Additions Cost Report
79414, Lubbock, Texas - January 24, 2018

Home Remodeling

$4.00 to $6.00 per square foot
15 percent deposit with balance due on job completion

Reported by:
Adam Watkins, Watkins Home Services
See the Lubbock Home Additions Cost Report
01420, Fitchburg, Massachusetts - June 22, 2018

Building a Closet

$1,488.04 to $1,628.81 for standard bedroom closet (4 ft reach-in)
Includes manhours for closet installation. Cost takes into account demolition, framing, drywall, and finishing for reach-in closet (48" wide and 28" deep). Additional charge for built-in shelving, custom organization systems, and walk-in closets.

Reported by:
ProMatcher Research Team
See the Fitchburg Home Additions Cost Report
37664, Kingsport, Tennessee - August 6, 2018

Building a Home Addition

$150.00 to $300.00 per square foot for premium grade construction
$100.00 to $200.00 per square foot for standard grade construction
The material used and the complexity of the project are the driving force of pricing. I will not lower my standards of craftsmanship to lower a price.

Reported by:
Scotty Anderson, Anderson's Home Repair LLC.
See the Kingsport Home Additions Cost Report
01702, Framingham, Massachusetts - April 20, 2018

Building a Garage Addition

$47.07 to $60.52 per square foot (custom designed, standard grade)
Includes the price of building a garage addition. Cost accounts for standard materials and waste removal. Does not include design drawings.

Reported by:
ProMatcher Research Team
See the Framingham Home Additions Cost Report
01613, Worcester, Massachusetts - January 3, 2018

Building a Sunroom

$97.71 to $138.32 per square foot (three-season room)
Price quote considers the cost of sunroom installation. Items included: adding a three-season room to an existing structural base, installing standard-grade windows, siding, roofing and fixtures, and installing electrical access. Cost excludes installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.

Reported by:
ProMatcher Research Team
See the Worcester Home Additions Cost Report
01453, Leominster, Massachusetts - March 20, 2018

Dormer Addition

$3,057.68 to $3,398.57 for single-window gable dormer
This window dormer installation price quote presumes typical conditions. No additional charge for standard-grade materials and supplies to build gable dormer with one average-sized window. Cost excludes room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .

Reported by:
ProMatcher Research Team
See the Leominster 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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