When DIY Becomes Risky: 7 Bathroom Jobs to Hire Out

The DIY-vs-pro decision framework

Four factors decide whether to DIY or hire out:

1. Plumbing change required? If yes, hire out.
2. Electrical work near water? If yes, hire out.
3. Structural framing or wall opening? If yes, hire out.
4. Tile-shower waterproofing involved? If yes, hire out.

If two or more of these come up “hire”, definitely hire. The cost of one redo is the cost of two installs.

What you can DIY

Five bathroom safety jobs are reasonable for a homeowner who’s comfortable with a drill and a tape measure:

DIY-friendly: Install grab bars where studs exist

10 minutes per bar. See how to install a grab bar yourself. The exception is grab bars in tile where there’s no stud, that pushes into pro territory because of the toggle-bolt-through-tile complication.

DIY-friendly: Swap a raised toilet seat

3 minutes, tool-free. The seat clamps to the bowl rim. See best raised toilet seats.

DIY-friendly: Replace the bath mat

30 seconds. Lift, place, press to suction.

DIY-friendly: Add a shower chair or transfer bench

5 minutes for setup. Adjustable legs, rubber tips, suction-cups (transfer bench inside-tub legs).

DIY-friendly: Adjust the water heater temperature

30 seconds at the heater dial. Set to 120 F.

That’s $300-$600 of meaningful safety improvements, all DIY, in a weekend.

What needs a pro

Job 1: Walk-in tub installation

A walk-in tub install is a plumbing, electrical, structural, and finish-tile job all at once. Even experienced DIY-ers don’t do these.²

What it costs to hire: $1,500-$8,000 in labor, on top of the tub itself ($3,000-$20,000). See walk-in tub cost.

What goes wrong if you DIY: the door seal leaks (most common failure), the subfloor sags, the drain doesn’t pitch correctly, the anti-scald valve isn’t installed to code. Each costs $1,500+ to fix after the fact.

Job 2: Tile-shower or curbless shower conversion

Waterproofing a tile shower is a precise multi-step process, membrane, slope, drain, then tile. A small mistake means water damage that shows up 18 months later.

What it costs to hire: $4,000-$15,000 depending on size and finishes. See best walk-in showers for seniors.

What goes wrong if you DIY: water leaks behind the tile within 2-3 years; substantial subfloor and wall damage; mold remediation.

Job 3: Adding wall framing for grab bars (during a remodel)

If you’re remodeling and want grab bars in locations without studs, the right move is to add 2x6 blocking inside the wall during the open-wall phase. This is a framing job, not a finish-trades job.

What it costs to hire: $200-$500 if added to an existing remodel scope.

What goes wrong if you DIY: the blocking isn’t anchored to the studs strongly enough to hold a 250-lb pull load; the bar pulls out under stress.

Job 4: Plumbing relocation (drain or supply lines)

Walk-in tubs, walk-in showers, and bathroom rearrangements often need drain or supply line moves. Plumbing through a finished bathroom floor is a code-required licensed-plumber job in most jurisdictions.

What it costs to hire: $1,500-$3,000 for a typical drain relocation.

What goes wrong if you DIY: code violations that block resale; drain slope wrong; leak under the floor that shows up months later.

Job 5: Electrical work near water

Adding a GFCI outlet near a tub, hard-wiring a backlit mirror, installing under-cabinet lighting in a bathroom, all electrical work in a wet location requires careful attention to code.

What it costs to hire: $150-$400 per outlet or fixture, depending on distance to the panel.

What goes wrong if you DIY: non-GFCI install fails inspection, permit issues, fire or shock risk.

Job 6: Stair lift installation

Stair lifts are sold and installed by the manufacturer. DIY isn’t really an option.

What it costs: $3,000-$10,000 for straight stairs, $9,000-$20,000 for curved. See best stair lifts.

Job 7: Walk-in tub finish-tile rework around the install

Even if the tub install is “easy,” the tile transition where new tub meets old tile is finish work. Bad tile-to-tile transitions look obvious and chip out within months.

What it costs to hire: $1,000-$4,000 for tile rework around a tub.

How to find a good contractor

Look for these credentials, in this order:

1. Licensed and insured in your state, verify the license number with your state contractor licensing board.
2. CAPS-certified. Certified Aging-in-Place Specialist, accredited by the National Association of Home Builders.⁴
3. Recent references, call three. Ask “would you hire them again?”
4. Written contract with itemized scope, materials, timeline, change-order terms, never accept a vague quote.
5. Permits pulled by the contractor, keeps liability with them, not you.

For more on finding the right specialist, see how to find a CAPS-certified specialist.

Cost expectations for hired-pro bathroom safety work

Typical 2026 costs for the most common jobs:²

Job	Cost range	Time
Single grab bar install (in tile, no stud)	$150-$300	1 hour
Walk-in tub installation	$1,500-$8,000	1-3 days
Curbless shower conversion	$4,000-$15,000	5-7 days
Drain relocation only	$1,500-$3,000	1 day
GFCI outlet install	$150-$400	1 hour
Subfloor reinforcement	$500-$2,000	1 day

Red flags from contractors

• Same-day pressure to sign.
• “Special price today only.”
• Refuses to provide itemized written quote.
• Won’t pull permit.
• Asks for more than 25% deposit upfront.
• Shows up unsolicited (“we were working in your neighborhood”).
• Pushes their own financing during the sales call.

For the full red-flag list, see the quote you should ask for.

What to do next

If your project is small (under $1,000): DIY the items in the “what you can DIY” section.

If the project is medium ($1,000-$5,000): consider an OT evaluation first to confirm the right scope.

If the project is large ($5,000+): get a CAPS-certified contractor evaluation before signing. The $200-$400 evaluation typically saves 10x its cost.

For broader strategy, see how to make your bathroom safer for aging parents.