Keep the old layout visible
Photos of the existing trap, waste and water feeds help plan the new connection.
Sink installation
Sink installation for kitchen sinks, laundry sinks, mixers, traps and waste connections.
A sink installation must align the bowl, mixer, trap, waste fall and cupboard access so the unit works without slow leaks.
Plumb A Nator helps with sink installation where a new sink, replacement bowl, mixer, basket strainer, trap or appliance waste connection must be fitted neatly. This service focuses on plumbing alignment, under-sink leak prevention, cabinet protection and drainage behaviour after the sink is installed.
Sink installation help line067 139 9980Tell us the sink type, cupboard layout, mixer position, existing water points and whether appliances connect under the sink.
Request Sink InstallationKitchen SinksBasket StrainersTrapsMixer Points
Sink fitting planning
Sink installation starts with alignment under the counter.
The visible sink is only part of the installation. The waste outlet, trap, mixer tails, isolation valves, overflow and appliance spigots must fit inside the cupboard without strain or hidden leaks.
Quick details that help before arrival
Useful details include sink size, countertop type, existing cut-out, trap position, mixer hole position, cupboard drawers, and nearby appliance waste hoses.
Before the team arrives
Check the cupboard and counter space before cutting or fitting.
A sink can look correct from above but fail below if the waste, trap or mixer tails clash with shelves, drawers or appliance hoses. Do not enlarge counter or cabinet holes before the pipe route is checked.
Check appliance hoses
Dishwasher or washing machine waste hoses may need a proper spigot and secure routing.
Avoid premature cut-outs
Do not cut a new counter opening until the sink template and plumbing route are confirmed.
Clear under-sink storage
Empty the cupboard so fittings, valves and traps can be reached and tested.
Focused service
Sink installation details that protect the cupboard.
This section focuses on the sink-specific parts that prevent hidden leaks after installation.
Bowls
Kitchen and laundry sink bowls
Sink bowls need stable seating, correct waste alignment and enough underside space for the trap and mixer tails. A tight cupboard can make the plumbing more important than the visible bowl size.
What to look for: Existing counter cut-outs, drawer positions, old silicone, rust around the waste and limited trap space.
Helpful hint: A sink that fits the hole can still be wrong if the waste outlet clashes with a shelf or drawer.
Waste
Basket strainers and sink wastes
Basket strainers, rubber seals and waste nuts must seal correctly so water does not track into the cupboard. Double bowls need careful joining and fall.
What to look for: Drips below the strainer, staining on cupboard boards or water appearing only when the bowl is full.
Helpful hint: Fill the bowl during testing because small waste leaks may not show during a quick rinse.
Traps
P-traps and under-sink routing
The trap must fit the available cupboard space and maintain a usable water seal without unnecessary strain on joints. Appliance spigots should be secure and accessible.
What to look for: Loose trap nuts, bad smells, slow drainage or hoses pushing the trap out of position.
Helpful hint: Keep cleaning products away from the trap area until testing is complete.
Mixers
Mixer points and isolation valves
Sink mixers need hot and cold feeds that are reachable and not twisted. Isolation valves reduce future disruption when a mixer tail or cartridge needs attention.
What to look for: Braided tails pulled tight, old valves that will not close, leaks at compression points or cupboard moisture.
Helpful hint: Ask for valves to be reachable after the sink is installed, not hidden behind drawers.
Sink Installation FAQ
Common questions about sink installation.
These answers are written for practical plumbing decisions, safety and preparation before the team arrives.
What should be checked before sink installation?
The sink size, counter cut-out, mixer position, hot and cold feeds, waste outlet, trap clearance, appliance hoses and cupboard access should all be checked before fitting.
Can a new sink use the old waste pipe?
Sometimes, if the new bowl and waste outlet line up. If the outlet position changes, the trap or waste route may need adjustment.
Why does a sink waste leak after installation?
Leaks can come from basket strainer seals, loose waste nuts, misaligned traps, cracked washers or joints pulled out of line.
Can you install a double kitchen sink?
Yes. Double bowls need correct joining, fall, trap layout and enough cupboard space for secure waste connections.
Should the sink be tested before final sealing?
Yes. Filling and draining the bowl helps reveal leaks around basket wastes and trap joints before the job is considered complete.
Can a dishwasher connect to the sink trap?
Often yes, when the trap has a suitable spigot and the hose is routed securely to reduce backflow and smell risk.
What causes bad smells under a sink?
Bad smells can come from poor trap layout, open spigots, loose waste joints, dry traps or food buildup in badly routed waste pipes.
Can a sink installation damage cupboards?
Poor cut-outs, slow leaks and bad trap alignment can damage cupboard boards. Planned routing and testing reduce that risk.
Do sink mixers need isolation valves?
Yes. Isolation valves make future mixer repairs and emergency shut-off much easier.
Can a laundry sink be installed?
Yes, when the water feeds, waste route, wall support and appliance layout are suitable.
What if my new sink does not fit the old hole?
The counter may need adjustment or a different sink size. Plumbing should be checked before cutting to avoid clashes underneath.
Can you replace only the basket strainer?
Yes, if the sink bowl is sound and the waste opening can seal properly.
Why does my sink drain slowly after installation?
Slow drainage can come from poor trap fall, blocked waste pipe, incorrect joining or a trap that is strained by the new layout.
What photos help before the visit?
Photos of the sink, cabinet, underside plumbing, mixer point and waste route help plan parts and access.
When is sink installation urgent?
It becomes urgent when the old sink or waste is leaking into cupboards, floors, walls or nearby electrical areas.