A homeowner in Lexington decided it was time to replace the bathtub. On paper, a tub swap sounds simple: old tub out, new tub in. But anyone who has opened up a bathroom wall knows the tub is the key that unlocks everything behind it. Once it comes out, you get one clear shot at the valve inside the wall, the drain underneath, the waterproofing, and the tile around it.
This is the story of that Lexington bathroom — everything we did while the tub was out, and why each piece was done then and not later.
The Plumbing You Only Get One Shot At: Tub, Valve, and Drain
The project started with the core swap: a new bathtub, a new shower valve, and a new drain. The shower valve is the part worth understanding here. It lives inside the wall, and reaching it means opening the wall up. Since the wall was already open for the tub replacement, replacing the valve and the drain at the same time was the practical move — it meant no finished tile would ever have to come back off to reach them.
That sequencing is the whole logic of a tub replacement done well. The parts you will never see again get handled while you can still see them.
What Goes Behind the Tile: Waterproofing Above the Tub
With the old tub out, the wall above it was rebuilt with cement backer board and a full waterproofing layer before any tile went on. Tile and grout look solid, but they are not waterproof on their own — water finds its way through grout lines, and in the splash zone above a tub, that happens every single day. The waterproofing layer is the part that actually keeps water out of the wall cavity, and it can only be installed before the tile covers it.
New wall tile went over that prepared surface, and the bathroom floor got new tile as well. Doing the floor while the old floor tile was already coming up meant the new tile could run cleanly under the new fixtures instead of being cut around them.
Fitting the Room Around the New Tub
One detail was settled before work began: the baseboard heater ran long along the wall where the tub sits, and the plan called for shortening it to fit the new tub’s footprint, so the heater and the tub each have the space they need without crowding each other. Planning for it early kept it a small adjustment instead of a surprise.
The Details That Make It Feel New
Ceiling
The old popcorn ceiling texture was scraped off and the ceiling was repaired, giving the room a clean, smooth surface. Removing the dated texture changed the feel of the whole room more than its square footage would suggest — ceilings catch the eye more than people expect.
Vanity, mirror, and toilet
The bathroom got a new vanity, a new mirror, and a new toilet. With new tile on the walls and floor, carrying the refresh through to the fixtures keeps everything in the room at the same standard — no single worn-out piece pulling the eye away from the new work.
Ventilation and electrical
A new exhaust fan was installed, along with a replacement light switch. Bathrooms produce a lot of moisture in a short time, and a working fan is what moves it out before it settles into paint, drywall, and trim. Installing the new fan while the ceiling was already being repaired meant no extra holes in a finished ceiling later.
Finishing: Baseboards and Paint
The room was finished with new baseboards and fresh paint throughout. Trim and paint are the last layer, and they are also the layer you look at every day — clean lines at the floor and fresh color on the walls are what make a remodel feel complete rather than merely repaired.
Why Do It All at Once
Looked at as a list, this was a lot of separate jobs: tub, valve, drain, waterproofing, wall tile, floor tile, a shortened baseboard heater, a scraped ceiling, a new vanity, mirror, toilet, fan, switch, baseboards, and paint. Done as one project, though, they fall into a natural order — hidden plumbing and waterproofing first, tile next, fixtures and finishes last — and nothing that is finished ever has to be torn up to reach something behind it.
That is the real lesson of this Lexington bathroom. A bathtub replacement is never just a bathtub replacement; it is a brief window when the whole room is accessible. Using that window well is what separates a tub swap from a bathroom that feels new for years.
If you are thinking about replacing a bathtub in the Greater Boston area, we are happy to take a look and talk through what your bathroom would need while the walls are open. Request a free estimate — no pressure, just a clear picture of the work. (We are licensed and insured, proof available on request.)