Cost guide
Bedroom Addition Cost in 2026
A bedroom addition is priced like any room addition: size, foundation and finish level matter most. Adding a bathroom turns it into a suite and raises the price.
Step 1 of 4
Your addition
Size and type.
Labor costs differ a lot by state. This adjusts every line.
New finished floor area, not counting the existing house.
Type of addition
Foundation
Estimated addition cost
$113,900
$73,000 – $154,800
The calculator above starts as a 300 sq ft ground-floor room. Open it set to a 200 sq ft bedroom to price your own.
Bedroom addition cost by size and type
| Scenario | Estimated range | Per sq ft |
|---|---|---|
| Small bedroom (150 sq ft)Ground floor, slab foundation, standard finishes | $42,000 – $96,300 | $280–$642 |
| Standard bedroom (200 sq ft)Ground floor, slab foundation, standard finishes | $52,400 – $115,800 | $262–$579 |
| Bedroom built up (200 sq ft)Second-story addition, no new foundation | $58,300 – $123,000 | $292–$615 |
| Primary suite with bathroom (300 sq ft)Ground floor, full bathroom included | $86,200 – $190,800 | $287–$636 |
Estimates at national-average pricing, calculated with our own pricing engine and reviewed September 2026. Change the inputs in the calculator to price your exact project.
A standard 200 sq ft bedroom built on the ground floor costs about $52,400–$115,800. Building the same room as a second story costs about $58,300–$123,000.
What drives bedroom addition cost
- Type matters most: a second story costs more per sq ft than a ground-floor room, but needs no new foundation.
- Bathrooms and kitchens are plumbing-heavy and can add $30k–$70k.
- Architect fees, permits and utility tie-ins are often missing from rough quotes.
- Additions carry more unknowns, so this estimate includes a larger contingency.
Cheaper ways to get a bedroom
- Convert existing space. A garage conversion or basement finish usually costs less than new construction.
- Build a simple rectangle. Extra corners and roof lines add cost quickly.
- Skip the attached bathroom if a nearby one will do. A bathroom adds about $12,000 to $30,000 before contingency.
- Check local rules for egress windows and permits before you draw plans.
Frequently asked questions
How much does it cost to add a bedroom?
A 200 sq ft ground-floor bedroom costs about $52,400–$115,800 nationally. A second-story bedroom of the same size costs about $58,300–$123,000. Your state, finishes and any bathroom change the number.
How much does a master suite addition cost?
A 300 sq ft primary suite with a full bathroom is priced in the table above. The bathroom is the largest single add-on, so a suite costs noticeably more per square foot than a plain bedroom.
Is it cheaper to add a bedroom or convert a garage?
Converting existing space is usually cheaper because you skip the foundation, framing and roof. See the garage conversion cost guide for a comparison.
Do I need a permit to add a bedroom?
Almost always. Permits, plan review and inspections vary by city, and bedrooms usually need an egress window. Ask your local building department before you plan the layout.