A shower that runs too hot, too cold or barely at all can ruin the start of your day. Shower valves live inside the wall, so problems can seem intimidating, but most issues come from a worn cartridge, a failing pressure-balance mechanism or mineral buildup. Hard water in the region leaves scale on shower heads and valve parts, and older homes in Unionville and Thornhill may have valves that are decades old.
We repair shower valves, heads, diverters and handles, and we work through the trim so we can avoid opening tile whenever possible.
Shower Repair Around Markham
Showers in older Markham homes, especially in Thornhill, Milliken and Unionville, may have two- or three-handle valves that have been in the wall for decades. Parts for many of these are still available, and rebuilding them can restore reliable operation. For some very old valves, we may recommend a modern pressure-balance valve, which protects against sudden temperature swings.
In newer homes, single-handle valves are standard, and their cartridges wear over time, particularly with hard water. Replacing the cartridge usually brings back smooth control and stops drips.
Pressure-balance problems are common in households with several bathrooms in use at once, which is the norm in larger Markham homes. If your shower goes cold every time the dishwasher runs, that's a sign the valve isn't balancing properly.
If you're planning a bathroom renovation, it's a good time to upgrade the valve, since the wall will be open. We can install a new valve during the renovation so it's ready for your new tile.
Scale also affects shower heads, and a simple cleaning or replacement can make a noticeable difference to water flow.
Anti-scald protection matters in homes with young children or older relatives, both common in Markham's multi-generational households. When we service a valve, we set the maximum hot-water temperature so nobody gets an unpleasant surprise, and we explain how the handle limit works in case you ever want to adjust it.
Signs You Need Shower Repair
Your shower needs a repair if you notice:
- Temperature swings. If the water turns hot or cold when someone flushes, the pressure-balance cartridge may be failing.
- Dripping after shutoff. A worn cartridge or seals let water through when the shower is off.
- Weak flow. Clogged shower heads or restricted valves reduce pressure.
- Diverter problems. Water still coming from the tub spout when the shower is on means the diverter is worn.
- Stiff handle. Scale and age make the valve hard to turn.
How We Do It
- 1
Diagnose from the trim
We remove the handle and trim to identify the valve type and its condition.
- 2
Shut off and replace parts
We replace cartridges, stems or seals with the correct parts for your valve.
- 3
Clean or replace heads and diverters
Scaled shower heads and worn diverters are cleaned or replaced.
- 4
Set temperature limits
We adjust the valve's limit stop for comfortable, safe temperatures.
- 5
Test
We run the shower, check temperature stability and confirm no drips.
Why Choose Markham Plumbing
Many shower problems can be fixed from the front without breaking tile. We work through the trim wherever we can, protect your tub and tile while we work and explain whether your valve can be repaired or should be upgraded.
- Tile-friendly repairs
- Temperature safety set
- Diverter repairs
- Clear explanations
Shower Repair FAQs
Why does my shower get hot when someone flushes?
Your valve's pressure-balancing isn't working properly. Replacing the cartridge usually solves it.
Do you have to remove tile to fix a shower valve?
Usually not. Most repairs can be done through the trim opening. Full valve replacement may need access from behind the wall or a larger trim plate.
How do I improve shower pressure?
Start by cleaning or replacing the shower head. If pressure is still weak, the valve or supply lines may be restricted.
My shower drips at night. Is it serious?
It wastes water and usually means a worn cartridge. It's a straightforward repair.