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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

$116.33 per square foot for standard grade construction (Range: $89.99 - $142.66)
$180.73 per square foot for premium grade construction (Range: $151.45 - $210.00)
Free Estimates from Local Pros

Cost of Building a Garage Addition

$41.77 per square foot (custom designed, standard grade) (Range: $36.53 - $47.01)
$23.50 per square foot (pre-designed kits and packages) (Range: $17.75 - $29.25)
Free Estimates from Local Pros

Cost of Building a Sunroom

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

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

$91.25 per square foot (Range: $71.50 - $111.00)
Free Estimates from Local Pros

Cost of Building a Closet

$3,000.00 for typical walk-in closet (approx. 9'x9') (Range: $2,500.00 - $3,500.00)
$1,576.05 for standard bedroom closet (4 ft reach-in) (Range: $1,503.92 - $1,648.18)
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

01035, Hadley, Massachusetts - April 29, 2018

Building a Home Addition

$180.00 to $250.00 per square foot for premium grade construction
$90.00 to $130.00 per square foot for standard grade construction
We bill for work completed, based on the time it takes to complete the task to specifications. We are happy to adjust billing timetables to a customers needs or changes they request. We often operate as residential building contractors and let the customer pay subcontractors directly. this save the customer money and allows some freedom in choosing subs for each job. In this case we bill for hours spent managing subs on the job. Short jobs we bid a day rate. larger projects we bid overall prices and modify the contract as the job requires. Materials are often purchased on an account and reimbursed within the standard billing cycle. We operate on a 10-80-10 billing cycle for larger jobs.

Reported by:
Benjamin Anderson, albatross builders
See the Hadley Home Additions Cost Report
27958, Moyock, North Carolina - July 20, 2017

Building a Garage Addition

$5.00 to $10.00 per square foot (pre-designed kits and packages)
Projects will be a cost estimate based on additional necessary materials and time necessary to complete.

Reported by:
Todd Robinson, TKR Ventures LLC
See the Moyock Home Additions Cost Report
01453, Leominster, Massachusetts - January 3, 2018

Building a Sunroom

$79.54 to $112.60 per square foot (three-season room)
Cost takes into account labor. Also includes building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Price does not include insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Leominster Home Additions Cost Report
01853, Lowell, Massachusetts - January 14, 2017

Dormer Addition

$3,800.64 to $4,224.36 for single-window gable dormer
Estimate accounts for the cost of window dormer installation. Price includes standard-grade materials and supplies to build gable dormer with one average-sized window. Items not included: room-size additions, permits, interior finishes, hip roof dormers, shed dormers, home electrical wiring, or plumbing, .

Reported by:
ProMatcher Research Team
See the Lowell 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
01101, Springfield, Massachusetts - March 1, 2017

Building a Closet

$1,624.88 to $1,778.61 for standard bedroom closet (4 ft reach-in)
This estimated quote includes closet building. It also includes framing walls and hanging drywall to add a closet to an existing room (4 ft wide). Cost excludes shelving systems, storage solutions, cabinets, lighting, or larger closets.

Reported by:
ProMatcher Research Team
See the Springfield Home Additions Cost Report
20119, Catlett, Virginia - April 24, 2018

Building a Home Addition

$215.00 to $275.00 per square foot for premium grade construction
$155.00 to $215.00 per square foot for standard grade construction
We charge the amount of money needed to sustain our small company in the area we live. I truly like what and who I do work for.I would work for free if it were possible, but unfortunately it's not. I am satisfied as long as I can satisfy someone.

Reported by:
Joseph Thibodeau, Thibodeau Contracting, Inc.
See the Catlett Home Additions Cost Report
01201, Pittsfield, Massachusetts - January 2, 2017

Building a Garage Addition

$38.71 to $49.77 per square foot (custom designed, standard grade)
Price quote includes garage construction. It includes standard materials and project cleanup too. Excludes blueprint preparation.

Reported by:
ProMatcher Research Team
See the Pittsfield Home Additions Cost Report
01760, Natick, Massachusetts - January 3, 2018

Building a Sunroom

$103.57 to $146.61 per square foot (three-season room)
Estimated quote includes sunroom construction. Also includes building a three-season sunroom onto an existing patio, deck, or slab foundation, standard materials (windows, siding, roofing, etc.), and basic electrical wiring. Cost does not take into account insulation, HVAC, plumbing work, and construction permits.

Reported by:
ProMatcher Research Team
See the Natick Home Additions Cost Report
01613, Worcester, Massachusetts - January 14, 2017

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
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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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