Curbless shower, steam room, freestanding tub: what a slab foundation allows.
Can you convert a tub to a walk-in shower on a slab? Move a toilet? Add steam, heated floors or a bidet seat? A practical bathroom guide for Scottsdale, Cave Creek and Phoenix homes.
- Reading
- 3 minutes
The short answer
A slab foundation turns plumbing changes into a concrete project, but nearly every bathroom wish is still possible if you plan the drain first.
- Drain location drives most slab bathroom layouts
- 1
- Always scan for post-tension cables before cutting a slab
- Scan
- Bidet seats and heated floors need protected circuits
- GFCI
- Needs a sealed, sloped ceiling and its own circuit
- Steam
Can I convert a tub to a walk-in shower with a curbless entry on a slab?
Yes. The usual ways are to recess the shower floor by cutting a channel in the slab, or to raise the rest of the bathroom floor slightly so the shower sits flush. Recessing is the neater result, and it needs a concrete saw, a plumber and a slab scan.
In 1980s homes in McCormick Ranch and Pinnacle Peak, the slab is usually conventional and cutting is straightforward. In newer homes with post-tension slabs, the work has to be planned around the cables. Our post on how to remodel a bathroom shower walks through how a shower floor is built up.
Bathroom upgrades and what each one asks of the house
Ordered by how often we see them, each with the question to settle first.
- 01
Walk-in shower with a linear drain
Arizona fit: 5 out of 5- Best for
- Aging in place and a clean, open look
- Why it works
- A single-slope floor and a linear drain make cleaning easy and remove the curb.
- Watch out
- Needs correct slope and waterproofing. Mistakes here become leaks you find later.
- 02
Freestanding tub
Arizona fit: 4 out of 5- Best for
- Primary baths with space and a view
- Why it works
- On a slab, weight is rarely a problem. A floor-mounted filler may need a supply line planned into the slab.
- Watch out
- On an upper floor, the framing must be checked for the added load.
- 03
Steam shower or sauna
Arizona fit: 3 out of 5- Best for
- Primary baths with a full tile enclosure
- Why it works
- A very comfortable winter-morning feature. It needs a generator, a vapor barrier and a sloped ceiling.
- Watch out
- Any gap in the waterproofing shows up fast. Hire a tile setter with steam experience.
- 04
Electric heated floor under tile
Arizona fit: 3 out of 5- Best for
- Cool-morning comfort in a primary bath
- Why it works
- A thin heating mat under tile warms a small area at a low running cost.
- Watch out
- A nice-to-have in the Valley. Expect to use it a few months of the year.
Do it yourself
DIY: stop hard-water spots on frameless shower glass
Frameless glass shows every mineral spot. Prevention is cheaper than polishing.
- Time
- 10 minutes a week
- Cost
- $15–$30 in supplies
You will need
- Squeegee
- Microfiber cloth
- White vinegar
- Glass protectant
Start with clean glass
Remove existing buildup with vinegar and a non-scratch pad before applying protection.
Apply a glass protectant
It makes water bead and roll off, so fewer minerals dry on the surface.
Squeegee after each shower
Ten seconds. This one habit does more than any product.
Check the showerhead
Mineral-clogged nozzles spray unevenly and leave streaks. Soak them in vinegar monthly.
More bathroom questions from Scottsdale and Cave Creek homeowners
Can I add a bidet seat, and does the toilet need an outlet? Most electric bidet seats need a GFCI outlet within reach of the toilet. If there isn’t one, an electrician can add it in the wall, ideally before tile goes up.
Can I add a second sink or a make-up vanity to a primary bath? Usually yes if the wall can take the plumbing. A make-up vanity needs only power, light and a mirror, with no water at all.
For finishes that resist mineral buildup, see our guide to hard-water-proof bathroom fixtures. If you are planning a full bathroom, our kitchen and bath design team coordinates fixtures, tile and plumbing from the start.
Before you build
Check your own city's rules
Permits, zoning and setbacks are set by the city or town, and they change. Use these official pages to confirm what applies to your lot before you order materials or sign a contract.
Check paperwork you already have
Your parcel number (APN) is printed on your county property tax statement and usually on your deed or title documents.
Or search by address
The Maricopa County Assessor lets you search by street address or owner name and returns the parcel number.
Use it on the city tools
Scottsdale, Phoenix and Cave Creek map and permit tools accept an address, and many also accept a parcel number.
These are links to official government sites, not advice. Requirements depend on your lot, zoning and the scope of work, so confirm with the city or town and your designer before you start.
Where it matters
Scottsdale
Primary baths in Troon, Grayhawk and DC Ranch often ask for steam and curbless showers. Plan the drain and the waterproofing together.
Cave Creek
Well-water homes need softening to protect fixtures and glass. Plan filtration alongside the remodel.
Phoenix
Arcadia and Biltmore baths in older slab homes often need new supply lines once the walls are open.
FAQ
Questions, answered
Can I convert a tub to a walk-in shower with a curbless entry on a slab?
Yes. Most are done by recessing the shower floor into the slab or raising the rest of the floor slightly. Both need correct slope and waterproofing, and a scan before cutting.
Can I add a steam shower or sauna in a primary bath?
Yes, with a steam generator, a vapor barrier, a sloped ceiling and a dedicated circuit. Choose a tile setter with steam experience.
Can I move a toilet or shower on a slab foundation?
Yes, but the drain is below the slab, so concrete has to be cut and repaired. Get a plumber’s estimate before locking in a layout.
Can I add a freestanding tub, and does my floor need reinforcing?
On a slab, usually no reinforcing is needed. On an upper floor, the framing should be checked. Floor-mounted fillers need a supply line planned early.
Can I add a bidet seat, and does the toilet need an outlet?
Electric bidet seats need an outlet, ideally GFCI-protected, near the toilet. Add one before tile goes up.
Can I add heated floors under tile in a Phoenix-area home, and is it worth it?
You can. It is a comfort feature for cool mornings, not a heating system. Many homeowners add it to the primary bath only.
How do I stop hard-water spots on frameless shower glass?
Squeegee after each shower, use a glass protectant and clean mineral buildup before it hardens. A water softener helps the whole house.
