How Much Does a First-Floor Bedroom and Bathroom Conversion Cost in 2026?

Updated October 18, 2026 · By the Aging in Place Grants research desk · How we research

Turning existing first-floor space into a bedroom and bath often costs $5,000 to $38,000, while a new suite addition can top $100,000.

When stairs become hard, many families move daily life to the first floor. That usually means a bedroom and a bathroom with a shower on the main level. Cost depends on one big choice: convert space you already have, or build new.

First-floor conversion cost at a glance

HomeAdvisor's range for building an addition is lower, at $10,000 to $75,000 or more ⁴. Angi's top range for a bedroom and bath addition reaches $150,000 ². The gap reflects very different project sizes.

Option 1: convert space you already have

Many homes have a den, dining room, office or family room on the first floor that can become a bedroom. Often the bedroom part is easy: add a door, a closet and good lighting.

The bathroom is the costly part. HomeGuide says converting existing space into a bathroom runs $5,000 to $25,000, or about $200 to $250 per square foot ¹. It also says a conversion can save nearly half compared with an addition ¹.

Spaces that cost less

Spaces close to existing plumbing cost less. HomeGuide lists a closet or under-stair space at $3,000 to $7,500 and a laundry room at $7,500 to $16,000 ¹. A laundry room already has a drain and water lines.

Spaces that cost more

A bedroom or office conversion runs $20,000 to $38,000, and a garage $20,000 to $30,000 ¹, because drain lines must be run farther and floors often need work. HomeGuide lists rough-in plumbing alone at $450 to $1,800 ¹.

Option 2: build an addition

If there is no spare room, an addition adds a new suite on the ground floor. Angi reports a national average of $103,300 for a primary bedroom and bath addition, with most spending $37,500 to $117,000, or about $80 to $220 per square foot ². Additions need a foundation, framing, roofing and often an architect and engineer. Angi lists permits averaging about $900 ².

Design the space for the long run

Whichever route you choose, build it so it will still work if needs grow:

• A doorway at least 32 inches clear, and 36 inches if a power chair is possible
• A curbless or low-threshold shower with a seat and grab bars
• Blocking in the walls for future grab bars
• A comfort-height toilet with room beside it for a helper
• Lever handles, good lighting and non-slip floors
• A clear path from bed to bathroom

An occupational therapist or a Certified Aging-in-Place Specialist (CAPS) can review plans before you build.

Budget for surprises

HomeGuide suggests setting aside 10 to 20 percent of the budget for unforeseen issues, and notes older homes may need extra plumbing or electrical work ¹.

DIY or hire a pro?

Hire a licensed contractor and pull permits. Labor is about half of bathroom project cost, according to HomeGuide ¹, so families sometimes save by painting or doing cleanup themselves.

Who can help pay

• Medicaid waivers can cover accessible bathroom changes, though caps are often below the cost of a full conversion.
• VA grants such as HISA cover bathroom access for eligible veterans, and larger SAH and SHA grants cover bigger projects for severe service-connected disabilities.
• USDA Section 504 loans of up to $40,000 at a fixed 1 percent rate, plus grants up to $10,000 for owners 62 and older, help very-low-income rural owners ⁵.
• City CDBG, state housing finance agency and nonprofit repair programs may help with accessible bathrooms.
• Tax deduction: Bathroom changes for a disability can count as medical expenses, but an addition may raise home value, which reduces the deductible part under IRS rules ⁶.

Bottom line

If you have a usable first-floor room near plumbing, a conversion often lands between $5,000 and $38,000. A new suite addition usually costs far more. Price both before deciding to move.

Common questions

Is it cheaper to convert a room or build an addition?

Converting is usually much cheaper. HomeGuide says a conversion can save nearly 50 percent compared with an addition.

What does it cost to turn a den or office into a bathroom?

HomeGuide lists converting a bedroom or office into a bathroom at $20,000 to $38,000 for 100 to 150 square feet.

How much does a new primary bedroom and bath addition cost?

Angi reports a national average of $103,300, with most homeowners spending $37,500 to $117,000.

Can a half bath work for aging in place?

A half bath with a toilet and sink helps, but bathing still requires the stairs. HomeGuide lists small half-bath conversions at $3,000 to $5,000, so it can be a useful first step.

Sources

1. How Much Does It Cost to Add a Bathroom? (2026) — HomeGuide. Checked October 18, 2026.
2. How Much Does It Cost to Add a Bedroom and Bathroom? — Angi. Checked October 18, 2026.
3. Cost to Remodel to Adapt for a Disability — Fixr. Checked October 18, 2026.
4. Disability Accommodation Cost Guides — HomeAdvisor. Checked October 18, 2026.
5. Single Family Housing Repair Loans & Grants — USDA Rural Development. Checked October 18, 2026.
6. Publication 502 (2025), Medical and Dental Expenses — Internal Revenue Service. Checked October 18, 2026.