Shower Remodel in Valencia, CA

The first question is how deep the job goes. The answer sets the price, the schedule and whether the city gets involved.

If the floor feels solid, the grout is stained rather than crumbling and nothing shows outside the shower, the trouble may be skin deep. Santa Clarita's code lists tiling and tub or shower surrounds as finish work that skips a building permit, and it lets a showerhead be swapped for one of like type too, as long as the new one meets the state's water saving rules (Santa Clarita code, 18.02.030 for the tile and 18.02.040 for fixtures).

The exemption covers the finish work only. Any plumbing, wiring or fan work done at the same time still needs its own permit. Old tile rarely comes off clean, so the contractor looks at the board behind it before promising that the wall can stay.

A leak changes the answer. If water has been getting past the tile, the pan or the wall behind it has failed, and the lasting fix is to take the shower down to the framing and build it again. The valve usually gets replaced while the wall is open.

That is where the permit comes in. Under the city's code, replacing a drain, pipe or valve hidden inside a wall or floor counts as new work rather than a repair, so the job gets a permit and inspections (SCMC 18.02.040, item 10).

A shower pan fails quietly. By the time anything shows, water has usually been getting through for a while. Things to look for:

• Grout or caulk at the floor that stays dark long after the last shower.
• Loose or cracked floor tiles, or a floor that gives a little underfoot.
• Stains, swelling or peeling paint on the wall or baseboard just outside the shower.
• A musty smell that cleaning does not shift.
• For a shower upstairs, a stain on the ceiling below it.

Any one of these is worth a look before new tile goes in, because fresh tile over a leaking pan only hides the problem for a while.

A tiled shower is a stack of layers, and each one has a job. The tile is the part you see, but it is not the part that keeps water in.

Under the floor tile sits a waterproof liner laid over a sloped base and pitched 1/4 inch per foot toward small weep holes in the drain body. It runs up the walls at least 3 inches past the top of the curb, and it carries over any built-in seat as well (California Plumbing Code 408.8). Water that soaks through the grout lands on the liner and drains away instead of reaching the framing.

Before the mortar bed and tile go on, the pan sits under 2 inches of standing water for a quarter of an hour. If the level drops, it gets fixed before anything covers it (408.8.5).

The walls get cement backer board rather than drywall, and a waterproofing membrane over the board seals the seams and corners before any tile goes up. The code's own line is simpler than the build: shower walls need a nonabsorbent surface to at least 6 feet above the floor (California Residential Code R327.2). The membrane is how the wall behind that surface stays dry too.

The valve body sits between two studs, and only the handle and its trim plate show on the tile. Every new shower valve has to be pressure balance, thermostatic or a mix of both, which keeps the temperature steady when someone flushes a toilet, and the hottest it will let the water get is 120 degrees (408.4 and 408.4.2). A handheld shower counts as a showerhead, and each one is limited to 1.8 gallons a minute at 80 psi (408.3).

A remodel is the one time the valve is easy to reach, which is why the contractor usually replaces it rather than tiling around an old one.

The finished floor must drop toward the drain by at least 1/8 inch for every foot, and never by more than 1/2 inch (408.6). Small floor tiles follow that fall toward a center drain easily. Large ones do not bend, so big floor tile usually pairs with a linear drain along one wall, which lets the whole floor tilt one way.

Grout is where hard water shows first. A sealed or epoxy grout is worth asking about when the contractor walks through the materials.

A walk-in is simply a shower you step into without climbing over a tub wall. In a hall bath it usually takes the place of the tub. In a primary bath it often replaces a cramped stall with something roomier.

The plumbing code sets the floor. A shower needs 1,024 square inches inside, wide enough that a 30 inch circle fits, and that space has to stay open up to 70 inches over the drain (408.7). That makes 32 by 32 inches the smallest square that passes. A 30 by 60 inch base is named as passing on its own, which is why a tub alcove converts so easily. The way in needs at least 22 inches of clear opening (408.6).

A built-in bench and a recessed niche for bottles make a walk-in easier to live with. A bench gets the same waterproofing as the floor, with the liner carried 3 inches above its seat (408.8).

Grab bars need solid blocking in the wall behind them. The code only requires that backing in newly built homes (R328.1), but a remodel is the cheapest time to put it in, even if the bars come years later.

A curbless shower has no step at all. The floor tile runs straight in, which is kind to knees and walkers and to anyone who means to grow old in the house. It is also the most involved kind of walk-in, because the shower floor has to drop and the waterproofing has to reach further into the room. The tub to shower guide walks through what that takes.

SCV Water's 2026 water quality report gives its imported surface water an average hardness of 160 mg/L for 2025, and its well water 354 mg/L. What reaches a given house depends on the blend served there. The agency's own water quality page says hard water leaves spots on glass and porcelain, and in a bathroom that means the shower glass first.

Frameless glass is thick panels held by hinges and clips with nothing around the edges. It looks the cleanest and leaves the fewest places for scale to build up. Semi-frameless adds a slim frame on some edges. Framed doors cost the least and seal easily, but their metal channels are where hard water leaves its crust first.

Whichever you pick, every pane in a shower door or enclosure has to be safety glass that passes the federal glazing test, CPSC 16 CFR 1201, rather than the lighter test some other glass in a house may use (R324.3.1 and R324.4.5).

Many glass shops offer a factory applied coating that makes water bead and run off. It slows spotting but does not stop it. A squeegee after each shower does more than any coating, and a whole house softener deals with the minerals at the source. SCV Water also lists a free water efficiency kit for its customers, one per account, that includes a WaterSense showerhead.

No neutral study publishes a price for a shower on its own; the public numbers cover whole bathrooms. What moves a shower price is easy to list, though. New tile over a sound pan and valve is the smallest job. A pan that has failed means demolition to the studs, a new liner and a water test, and a permit. A new valve opens the wall behind the controls. Frameless glass and a tiled bench add more. For scale only: a whole bathroom, hired out, came to $12,285 on average in 2023 for owners nationwide, per Harvard's tables built on federal survey data (Improving America's Housing 2025).

One cost is easy to miss. When the job has a permit and the house went up no later than January 1, 1994, state law has every older high flow toilet, faucet and showerhead in the home replaced before final sign off (Civil Code 1101.4). If your toilets are original, budget for them. For everything beyond the shower, see the bathroom remodel cost guide.

From demolition until the glass goes in. In between come the new plumbing, a rough inspection before the walls close, the pan and its water test, the backer and waterproofing, then the tile. The glass is measured once the tile is set and made to order, so the last stretch is often a wait.

A retile over a sound pan skips most of that list. If this is the only shower in the house, ask the contractor how the work can be ordered to keep the gap short. The dates come in writing with the price.