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Shower repair in San Jose for valves, cartridges, diverters and pan leaks
A shower that drips after it is turned off, a handle that swings too far before it runs hot, a diverter that sends half the water out the tub spout, or a stain spreading under the floor. Most shower repairs happen behind the handle or under the pan.
Shower repair in San Jose usually means replacing a worn cartridge or valve seats for a drip or temperature problem, rebuilding a diverter that leaks to the tub spout, or finding a pan leak with a flood test. Most valve work is done from the front through the trim, without opening the wall.
Warning signs
Signs a shower needs repair
- Drips after shutoff
A worn cartridge or seats.
- Temperature swings
A failing pressure-balance cartridge.
- Never gets hot enough
Anti-scald stop set low, or a worn cartridge.
- Water out of the tub spout
A diverter that no longer seals.
- Stain on the ceiling below
A pan, drain or valve leak.
- Loose or cracked tile
Water getting behind the surface.
- Musty smell
Moisture under the pan.
What happens after you call
How a shower repair visit runs
- 1
Call
Drip, temperature or leak?
- 2
Identify
Valve maker, model and type.
- 3
Test
Flood or spray test for leaks.
- 4
Repair
Cartridge, diverter, valve or drain.
- 5
Set limits
Anti-scald stop adjusted.
- 6
Check
No drips, steady temperature.
The job
Drip, temperature or leak: three different repairs
A drip from the head after the water is off is a valve problem. A shower that swings hot and cold, or never gets hot enough, usually has a worn cartridge or a misset anti-scald stop. Water in the ceiling below, or at the baseboard outside the shower, is a pan, drain or valve-body leak, and that one is found with testing before anything is opened.
A new shower or a tub conversion is covered under shower installation. Leaks that could be coming from somewhere else are traced under leak detection.
Shower valve replacement
When a valve body is corroded, cracked, or an obsolete model with no parts left, the valve itself is replaced. That means opening the wall from behind where there is access, from a closet or the room next door, or cutting a tile opening from the front that a larger trim plate can cover. A new pressure-balance or thermostatic valve is soldered or crimped in, tested and fitted with new trim. While the wall is open we check the supply lines to the valve, since they are often as old as the valve.
Cartridge swap
Most single-handle shower valves use a cartridge that mixes hot and cold and, in pressure-balance valves, guards against sudden temperature changes. Worn cartridges drip, stiffen, or lose the balancing function so the shower turns cold when a toilet flushes. We identify the valve maker and model, fit the matching cartridge, clean scale from the valve body, and set the anti-scald limit stop so the handle cannot run too hot. Moen, Delta and Kohler cartridges are specific to their own valves.
Diverter repair
A tub-shower diverter sends water up to the showerhead instead of out of the spout. When it wears, water keeps coming from the spout while the shower runs, wasting water and weakening the spray. Spout-mounted diverters are fixed by replacing the tub spout; valve-mounted diverters on three-handle setups need a new stem or cartridge. We confirm which type you have before ordering parts, and check that the new spout is the right length for the pipe it slides onto, so it seals and sits tight to the wall.
Shower pan leak
A shower pan leak shows up as a ceiling stain below, damp baseboards outside the shower, or loose tile at the floor. The cause can be the pan liner, the drain connection, or grout and caulk letting water behind the tile. We separate them with testing: a flood test with the drain plugged checks the pan, and running water only on the walls checks the surround. The fix ranges from resealing the drain to replacing the pan, and we only recommend tearing out what the test shows has failed.
Local context
Older shower valves in San Jose homes
Plenty of San Jose bathrooms still run on their original shower valves, including older two- and three-handle designs whose parts are getting hard to find. When a cartridge or stem is no longer made, the choice is between a conversion kit that fits the existing valve body and a new valve behind the wall. We check part availability for your valve before recommending either, so the repair is not held up waiting on a discontinued piece.
Cost factors
What changes the price of a shower repair
Planning range, not a quote: $140 to $220 per hour for plumbers in Santa Clara County. Source: proplumbersanjose.com, 2026-07-26.
- Valve type Common cartridges cost less than obsolete parts.
- Access A back panel is easier than cutting tile.
- Pan leaks Testing comes before any tear-out.
- Tile work Tile repair is often separate.
- Time of call After-hours is billed differently; you hear how first.
Every job is priced after we see it; any published range is for planning only.
Brands we service and install
FAQ
Shower repair questions
Usually a worn cartridge or valve seats.
The pressure-balance cartridge is failing.
Most cartridge and diverter repairs are done from the front.
A flood test with the drain plugged, separate from a wall spray test.
Often, if parts exist; otherwise a conversion kit or a new valve.
Moen, Delta, Kohler and most others.
Stop using that shower and call; we test it promptly.
Related work
Other Kitchen & Bath jobs we handle
Shower problem in San Jose? Call any hour
We find which part failed before anything is opened.
Updated September 2026