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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)
Free Estimates from Local Pros

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

98266, Maple Falls, Washington - May 30, 2025

Building a Home Addition

$225.00 to $275.00 per square foot for premium grade construction
$150.00 to $175.00 per square foot for standard grade construction
I charge this price to handle the plans and permits, inspections, you just got to decide how big you want to go and let me and my team handle the rest we work with some amazing architects have a stellar reputation with inspectors. I provide tons of pics of the job same day work order estimates a 1 year warranty on all work if anything fails in the first year its free to get it fixed. We want your great grand kids to enjoy the addition as well we strive for perfection and work till we are that's why we give ourselves an entire year to make sure we are. lol.

Reported by:
Deborah Weston, Home Pros
See the Maple Falls Home Additions Cost Report
50401, Mason City, Iowa - May 16, 2021

Building a Garage Addition

$31.19 to $40.09 per square foot (custom designed, standard grade)
Estimate takes into account the cost of building a garage addition. Price does include standard grade materials and debris removal. Excludes design drawings.

Reported by:
ProMatcher Research Team
See the Mason City Home Additions Cost Report
48085, Troy, Michigan - November 14, 2022

Building a Sunroom

$75.70 to $108.53 per square foot (three-season room)
This is how much one can expect to spend on sunroom installation. Typically included in the price: building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Prices may be higher for insulating materials, heating and air conditioning work, and permitting .

Reported by:
ProMatcher Research Team
See the Troy Home Additions Cost Report
27215, Burlington, North Carolina - October 29, 2020

Dormer Addition

$2,800.16 to $3,112.34 for single-window gable dormer
This estimate includes dormer addition construction. Also includes cutting into an existing roof, framing structure, installing window, re-roofing, and re-siding. There is an additional cost 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 Burlington 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
97701, Bend, Oregon - January 18, 2023

Building a Closet

$1,534.13 to $1,679.27 for standard bedroom closet (4 ft reach-in)
Manhours for closet building are included in price. Cost estimate includes framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Does not include shelving systems, storage solutions, cabinets, lighting, or larger closets.

Reported by:
ProMatcher Research Team
See the Bend Home Additions Cost Report
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
22314, Alexandria, Virginia - May 16, 2021

Building a Garage Addition

$49.35 to $63.45 per square foot (custom designed, standard grade)
Price range takes into account garage construction labor. Price also includes standard materials and project cleanup. Items that are not included: blueprint preparation.

Reported by:
ProMatcher Research Team
See the Alexandria Home Additions Cost Report
19082, Upper Darby, Pennsylvania - November 14, 2022

Building a Sunroom

$101.09 to $144.94 per square foot (three-season room)
This is how much one can expect to spend on sunroom installation. Typically included in the price: standard three-season room addition with builder-grade materials (windows, siding, and roofing) and standard electrical work. Prices may be higher for installing insulation, extending heating and/or cooling system, installing plumbing, and pulling permits.

Reported by:
ProMatcher Research Team
See the Upper Darby Home Additions Cost Report
87544, Los Alamos, New Mexico - October 29, 2020

Dormer Addition

$3,247.12 to $3,609.13 for single-window gable dormer
Estimate for window dormer installation is included. No additional charge for standard-grade materials and supplies to build gable dormer with one average-sized window. Cost does not take into account room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .

Reported by:
ProMatcher Research Team
See the Los Alamos 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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