Replacing an Old Fiberglass Tub or Shower Unit

Signs the unit is near the end

• The floor of the tub or shower flexes or creaks when you stand in it
• Hairline cracks, especially near the drain or in the corners
• Staining or a dull, chalky surface that no longer cleans up
• Caulk at the base that keeps failing, or water marks on the ceiling below
• A soft spot in the bathroom floor right in front of the unit

Flexing is the one to take seriously. It usually means the unit was not fully supported underneath, or that something under it has changed. Each flex works the caulk joints and drain connection a little looser.

Why removal is more work than you expect

A one-piece unit is often bigger than the bathroom door because it was set in place before the walls were framed or finished. Getting it out usually means cutting it into sections. The unit is also fastened to the studs through its flanges and covered by drywall at the edges, so the wall around it gets opened up. That is normal, and it is part of why replacing one unit usually turns into at least a shower or tub surround project rather than a straight swap.

Your replacement options

A tiled walk-in shower

If nobody uses the tub, the alcove becomes a tiled walk-in shower with a waterproofing system behind the tile, a niche and a glass panel or door. Our Herndon remodel is built around a tiled walk-in shower; it is a good example of the finished look.

A new tub with a tiled surround

If you want to keep a tub, a new tub set on a proper base with a tiled surround above it gives you a more durable, easier-to-update finish than another one-piece unit. A built-in niche replaces the molded shelves you lose.

Another multi-piece or one-piece unit

Multi-piece units that assemble in the room exist and can suit some budgets. They avoid tile and grout entirely. Ask about the trade-offs in look, durability and how they handle future repairs.

What we often find behind an old unit

Once the unit is out, we check the subfloor around the drain, the studs on the valve wall and the condition of the valve and drain. Water that has leaked past failing caulk for years often shows up as staining or softness in the subfloor. Old shower valves may be worth replacing while the wall is open. These are not guaranteed problems, but they are common enough that your written scope should say how they will be handled and priced if found.

This is also where waterproofing matters. Bathroom Brigade uses Schluter waterproofing, such as Kerdi-Board and Kerdi-Shower kits, behind tile in wet areas. A tiled shower is only as good as what is behind the tile.

Planning around the removal

Cutting out an old unit makes dust and noise, and the bathroom will be out of service while the new shower or tub is built, waterproofed and tiled. If this is your only full bathroom, tell us before scheduling so we can talk through sequencing. In a townhouse, we also cover stairs and the path to the door, since the unit comes out in pieces through the house.

Think about how the new shower will be used before choosing finishes. A family that bathes small children will want a tub or a handheld shower; someone planning to stay in the home long-term may want a low threshold and blocking for grab bars. Both are easy to plan when the old unit is out and the walls are open, and much harder once the tile is up.

Permits

Replacing the valve, drain or supply lines is plumbing work. Inside the Town of Herndon, plumbing needs its own permit in addition to the building permit for the alteration. Outside town limits, Fairfax County lists new, repaired or relocated plumbing fixtures as needing a permit.

Cost