Bathtub and shower installation in Knoxville, TN covers removing the old tub, setting a new tub or shower base level on a solid floor, connecting the drain and overflow, and replacing or adapting the valve for the new layout. A tub-to-shower conversion also moves the drain to suit the new base and raises the valve and shower head.
Updated October 2026
Planning the Plumbing Behind a New Tub or Shower
A tub or shower swap is simple only when the new fixture fits the old drain location and valve. Change the size, switch a tub for a shower base, or choose a freestanding tub, and the drain, valve and supply move with it. That is best decided before demolition, with the new fixture's specifications in hand.
Kohler and Delta make many of the tubs and bases we set, paired with Moen, Delta or Kohler valves. For the whole bathroom layout, see bathroom plumbing remodels; for a dripping valve alone, shower repair.
What a Tub or Shower Install Costs Depends On
The fixture and what moves behind it drive the price.
Tubs and bases range widely in price.
Relocating a drain, especially on a slab, adds work.
Replacing an old valve while the wall is open.
Cast iron tubs take more to remove.
Tile or surround work is a separate trade.
Tub, Tub-Shower or Walk-In Shower
The choice changes the drain, the valve and how the room works.
| Option | Best for | Plumbing changes |
|---|---|---|
| Tub or freestanding tub | Soaking, families with young children | Floor or wall drain, tub filler |
| Tub-shower combination | The most flexible layout | Diverter valve, spout and head |
| Walk-in shower | Easy access, a modern look | Drain moved for the base, shower-only valve |
Tub to Shower Conversion
Converting a tub to a walk-in shower is one of the most requested bathroom changes. The tub comes out, the drain is moved to where the new shower base needs it, often from the end of the tub to the center or end of the base, and the old overflow is capped. The valve is raised or replaced with a shower-only valve, and the shower arm is raised to a comfortable height. Over a slab, moving the drain means cutting concrete; over a crawlspace, the work is done from below.
Walk-In Shower Base
A walk-in shower needs a base that drains correctly: a factory pan, or a tile floor built over a waterproof liner or membrane sloped to the drain. Low-threshold and curbless designs need the floor recessed or built up so water stays inside. We set the drain for the base you choose, whether a center drain or a linear drain, test it for leaks before the walls are finished, and place the valve and shower head where the people using the shower actually want them.
Alcove Tub Replacement
Replacing a tub between three walls means cutting the old one out or removing it whole, the hardest part with cast iron. The new tub is leveled on a mortar bed or its own supports, the drain and overflow connected and tested, and the tile flange set so the wall finish seals over it. If the valve is old, this is the time to replace it, since the wall is already open. We coordinate with the tile installer so the tub is protected and filled for a leak test before the walls go up.
Old Drains Under Knoxville Bathtubs
How a Tub or Shower Install Runs
- 1
Plan
Fixture specs, drain and valve positions confirmed.
- 2
Remove
Old tub or shower taken out.
- 3
Plumb
Drain, overflow and valve set for the new fixture.
- 4
Set and test
Tub or base leveled and leak-tested.
- 5
Trim
Spout, head and handle installed after tile.
How Long the Bathroom Is Out of Use
A like-for-like tub swap is the quickest version; a conversion takes longer because the drain and valve move and the new walls have to be tiled. The plumbing is a small share of the time, and most of the wait belongs to tile and finishing.
We set the tub or base and test it early so the tile installer can start, then come back to set the trim once the walls are finished.
Bathtub & Shower Installation Questions From Knoxville Homeowners
Can you convert my tub to a walk-in shower?
Yes. The drain and valve are moved to suit the new base.
Is a cast iron tub hard to remove?
It is heavy; it is often broken up in place or carried out whole with extra hands.
Do I need a new valve with a new tub?
Not always, but an open wall is the best time to replace an old one.
Can a freestanding tub go anywhere?
Wherever a floor drain and water supply can reach, on a floor that can carry its weight.
Do you install the tile?
We handle the plumbing and coordinate with your tile installer.
Will a new shower base fit my old drain?
Only if the drain lines up with the base; otherwise the drain is moved.
Other Kitchen & Bath Jobs We Handle
Bathroom Plumbing Remodel
Moving a drain and rough-in for a second bathroom.
Bathroom Plumbing Remodel detailsOutdoor Faucet & Hose Bib Repair
Frost-free sillcock and split hose bib after a freeze.
Outdoor Faucet & Hose Bib Repair in KnoxvilleWalk-In Tub Installation
Hot water capacity and fast-drain plumbing.
Walk-In Tub Installation in KnoxvilleReplacing a tub or shower?
Call to plan the plumbing before the old one comes out.