Room-by-Room

What Will Your New Room Cost?

Get a detailed cost estimate for a bathroom, kitchen, bedroom, garage conversion or sunroom, broken down by materials, labor and your region. Free and instant.

Estimate my room
Under a minute Cost breakdown Region adjusted
Room type Step 1 of 4

Which Room Are You Adding?

Pick the room closest to your project.

Estimates include typical materials and labor for the chosen finish. Permits and unusual site conditions are extra. Confirm with contractor bids.

How the Room Calculator Works

Tell us the room, size and finish, and we estimate materials, labor and regional cost.

1. Pick the Room

Each room type carries a different cost per square foot based on plumbing, fixtures and finishes.

2. Set Size and Finish

Enter the square footage, choose a finish level and add any optional features.

3. See the Breakdown

Get a low-to-high range, cost per square foot and a materials, labor and region breakdown.

Typical Cost per Square Foot by Room

National averages from economy to premium finishes. Your estimate is then adjusted for your state’s construction costs, from about 35% below to 90% above these figures.

Bathroom $383 to $720 / sq ft
Kitchen $340 to $640 / sq ft
Bedroom / Office $213 to $400 / sq ft
Sunroom / Enclosure $170 to $320 / sq ft
Garage Conversion $106 to $200 / sq ft

What Affects Your Room Addition Cost

Plumbing and Fixtures

Bathrooms and kitchens cost the most per square foot because of plumbing, cabinetry and appliances.

Finish Quality

Economy to premium can more than double the per-square-foot rate for the same room.

Square Footage

Bigger rooms cost more overall, though cost per square foot often dips a little at larger sizes.

Your Region

Labor and material rates vary by state. Your ZIP code is matched to its state, and the estimate is adjusted by that state’s cost index.

Planning the project as a whole? Read our room addition planning guide, or see sample budgets for a 20x20 room and a 400 sq ft master suite.

Room Addition Cost FAQ

How much does it cost to add a room?
Nationally, most room additions run from about $106 to $720 per square foot depending on the room type and finish level, before adjusting for your state. Bathrooms and kitchens cost the most per square foot because of plumbing, cabinetry and fixtures.
Which room is most expensive to add?
Bathrooms are typically the most expensive per square foot, followed by kitchens. Bedrooms, offices and garage conversions cost the least because they need fewer fixtures and finishes.
What affects the cost of a room addition?
Square footage, room type, finish quality, optional features like custom cabinets or a soaking tub, and your regional labor and material rates all affect the total.
Does this estimate include labor?
Yes. The per-square-foot rates include typical materials and labor for that finish level, adjusted for your region. Permits and unusual site conditions are extra.
Is the calculator free?
Yes. It is free and gives an instant low-to-high range plus an emailed copy of your breakdown.

Estimate Your Room Now

Get a detailed cost breakdown, then connect with vetted local contractors for real quotes.

Start the calculator