01Overview
Fixture work covers toilets, faucets, sinks, showers, tubs, garbage disposals and the water and drain connections for dishwashers and washing machines. Most of it is repair or like-for-like replacement; moving or adding fixtures is a bigger job with more rules.
- Cold water
- Hot water
- Drain / waste / sewer
- Vent
- 1Trap: holds a water seal that blocks sewer gas
- 2Branch drain: needs a steady slope toward the stack
- 3Stack: carries waste down to the building drain
- 4Vents: let air in so draining water doesn't siphon the trap seals
- 5Cleanout: access point for clearing a clog
Simplified, not to scale. Real layouts vary by building.
A dripping faucet usually needs a new cartridge or washer.
02Signs you may need this
- Toilet runs, refills on its own, or rocks on the floor
- Faucet drips or leaks at the base
- Shower temperature swings when someone uses water elsewhere
- Low flow at one fixture
- Leak or smell under the sink
- Garbage disposal hums, jams or leaks
- Water under the dishwasher or washing machine
03Common causes
| Fixture | Usual cause | Typical fix |
|---|---|---|
| Running toilet | Worn flapper or fill valve | Replace the parts |
| Rocking toilet | Loose flange or failed seal | Reset with a new seal; repair the flange |
| Dripping faucet | Worn cartridge, washer or seat | Replace the cartridge or the faucet |
| Shower temperature swings | Old valve without pressure balancing | Replace the shower valve |
| Leak under sink | Loose trap, failed supply connector | Tighten or replace |
| Disposal jam or leak | Obstruction, worn seals | Clear or replace the unit |
Inside a toilet tank: a worn flapper or fill valve is behind most running toilets.
04Possible solutions
| Situation | Usual choice |
|---|---|
| Common part failure on a newer fixture | Repair |
| Old fixture, parts hard to find | Replace |
| Old shower valve with temperature swings | Replace with a pressure-balancing valve |
| Renovation | Replace and, where needed, relocate (permitted work) |
The right approach depends on what the plumber finds on site. This table is general information, not a diagnosis.
Replacing an old shower valve stops hot and cold swings.
05What affects the cost
Prices are set by the plumber and depend on what's found. These factors usually matter most:
- Repair vs. replacement
- Fixture and parts chosen
- Access behind tile or in tight cabinets
- Building rules (co-op and condo approvals)
- Whether the work becomes a filed alteration
06What a plumber typically checks
- Checks the fixture's valves and supply connections
- Identifies the make and replacement parts
- Checks the drain and trap
- Tests pressure and temperature at the fixture
- Recommends repair or replacement
07By building type
- Apartments
- Fixture repairs in rentals are usually the landlord's responsibility. In co-ops and condos, owners typically handle fixtures inside the unit.
- Prewar bathrooms
- Old two-handle shower valves and drum traps are common and harder to service.
- Houses
- Easier access from the cellar or basement for drain and supply work.
08Local considerations
New York City
In NYC, replacing an existing fixture is considered minor work that can be done without a permit, but it must still be done by or under a Licensed Master Plumber. Moving or adding fixtures is a filed alteration. Many co-op and condo boards require approval even for fixture replacement.
Long Island, Westchester & Hudson Valley
Like-for-like fixture replacement is often permit-free, but rules differ by town and village. Ask the plumber or the building department.
New Jersey
Some minor fixture work is treated as ordinary maintenance; relocating fixtures needs a permit. The construction official decides what falls where.
09Permits & licensing
- NYC: fixture replacement by or under a Licensed Master Plumber; relocation is filed with DOB
- New Jersey: permits for new or relocated fixtures through the construction office
- Co-ops & condos: check alteration rules before work
Rules differ by jurisdiction. Compare NYC, Long Island, Westchester and New Jersey.
10Frequently asked questions
Do I need a plumber to replace a toilet in NYC?
Yes. Fixture replacement is minor work that may not need a permit, but in NYC it must still be performed by or under a Licensed Master Plumber.
Why does my shower get hot when someone flushes?
Older shower valves don't compensate when cold-water pressure drops. A pressure-balancing or thermostatic valve fixes it.
Are garbage disposals allowed in NYC?
Disposals are generally allowed in NYC, but some buildings prohibit them in their house rules. Check with your building first.
11Bathroom & Kitchen Plumbing by area
We take calls about bathroom & kitchen plumbing across the region. Choose your area for local building and permit details.
New York City
Long Island & Hudson Valley
New Jersey
12Related
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Sources & review
Last reviewed . General information, not legal or engineering advice. Rules change and individual buildings differ.