Under-Sink Plumbing Repair · Leicestershire
Under-Sink Plumbing RepairIn Leicestershire — Traps, Wastesand Supply Lines Re-Sealed.
Under-sink leaks rot kitchen carcasses fast. We trace the actual source (it's almost never where the water is sitting), replace traps, wastes and flexible supplies, and pressure-test under load before we leave.
Most jobs under 90 minutes · 12-month guarantee · Fixed prices from £105
- 18 years' experience
- Same-visit fix on 9 of 10 jobs
- 12-month workmanship guarantee
- Fully insured — £2m public liability
- 1,600+ under-sink repairs completed
Overview
What under-sink plumbing repair covers — and why it matters.
What it is
Under-sink plumbing repair covers any leak or fault on the pipework between the wall and the sink — supply lines (flexi hoses), isolation valves, trap (P-trap or bottle trap), waste pipe, dishwasher and washing machine tee connections, and the basin/sink waste itself.
Who it's for
Anyone who's noticed water pooling in the under-sink cupboard, swelling chipboard at the cupboard base, a damp smell from the kickboards, or a slow drip when the tap is run.
When you need it
As soon as you spot any moisture in the cupboard. The cupboard base on most modern kitchens is moisture-resistant chipboard at best — it swells and breaks within days of sustained moisture contact.
Why professional matters
Under-sink fittings combine 4–6 different components (supplies, isolators, trap, waste, tee-offs for appliances) — so a leak that appears on the cupboard floor could be from any of them. A professional traces the actual source, not the visible symptom, and replaces with parts that match the rest of the run.
What happens if you ignore it
The cost of waiting.
Under-sink leaks are the most common cause of kitchen carcass failure in modern homes. The base panel of a kitchen unit is rarely solid wood — it's moisture-resistant chipboard that swells, delaminates and falls apart within weeks of sustained moisture.
Risks if left unrepaired
- Kitchen unit bases delaminate within 2–3 weeks of sustained moisture — usually requiring a full unit replacement.
- Damp from a slow drip migrates along the kickboards to neighbouring units.
- Mould grows quickly in the dark, damp cupboard environment — a hygiene risk in a food preparation area.
- Flexi supply hoses degrade with age — a 10-year-old flexi is statistically far more likely to burst than a new one.
- Failed dishwasher and washing machine tee connections can flood a kitchen overnight when the appliance runs.
Common DIY mistakes we see
- Tightening a weeping trap nut until the thread strips — a £4 nut becomes a full trap replacement.
- Using mole grips on chrome trap nuts — crushed and unrecoverable.
- Wrapping leaking supply hoses in tape — flexis fail catastrophically, not gradually.
- Sealing a waste connection with silicone instead of replacing the rubber seal.
- Ignoring the drip because the cupboard floor seems to dry overnight — most of the water is now in the chipboard fibres.
Our process
A five-step system — every job, every time.
- 1
Empty & Inspect
Cupboard contents removed and stored. Full inspection of every joint with a torch and a paper towel — we find the source, not the symptom.
- 2
Isolate
Isolate at the in-line service valves or the property stopcock. Towels and a tray laid down to catch residual water.
- 3
Repair
Failed component replaced — trap, waste, supply hose, isolation valve or tee. We use chrome or plastic to match the rest of the installation.
- 4
Pressure Test
Cold and hot run under full pressure for 5+ minutes. Sink filled and drained 2–3 times to test the waste and trap under load.
- 5
Clean & Repack
Cupboard wiped down, kickboard area dried, cupboard contents replaced exactly as found. Written 12-month guarantee handed over.
Benefits
What you actually get.
Source-Level Repair
We fix what's actually leaking, not the symptom. The first-time fix rate is over 90%.
Protects the Kitchen
A £105 under-sink repair this week prevents a £700+ unit replacement next month.
Modern Flexi Replacements
We always recommend replacing flexis older than 5 years while we're there — cheap insurance against a catastrophic burst.
Appliance Tee Service
Dishwasher and washing machine connections checked and serviced while we're under the sink.
Clean Work in a Tight Space
We work in cluttered under-sink cupboards every day — your stuff is moved carefully, the work area kept clean, and everything put back exactly as we found it.
12-Month Guarantee
Every joint we make and every part we fit is covered for a full year on workmanship.
In detail
The technical detail behind a proper under-sink plumbing repair.
Under-sink pipework is a cluster of small components that all live in a damp, dark, cramped environment. Each one has a different failure mode.
Flexi supply hoses
Braided stainless flexis are the standard connection between the isolation valve and the tap tail. They have a finite life — typically 10–15 years — and fail catastrophically when they go. We replace with WRAS-approved EPDM-lined hoses of the correct length (never coiled, never under tension).
Isolation valves
The small in-line valves that let you isolate the sink without turning the whole property off. They fail by seizing, weeping at the spindle, or partial closure that restricts flow. We replace with a modern lever-style isolator that everyone in the house can operate.
Traps (P-trap and bottle trap)
Modern kitchen sinks usually run a 1.5-inch bottle trap; basins typically run a 1.25-inch P-trap. Failure points are the compression nuts, the rubber washers, and the seal where the trap meets the waste outlet. We replace as a complete unit where the body is cracked or hairline-fractured.
Waste pipe and connections
32mm or 40mm waste pipework from the trap to the wall. Push-fit and solvent-weld both used; both fail at the rubber ring if not seated correctly. We replace failed sections and confirm the fall is correct (minimum 1:40 on a horizontal run).
Dishwasher and washing machine tees
Many under-sink installations include a tee with two appliance connections. These are a common leak source — both at the tee body itself and at the appliance valve. We service and replace as part of the visit.
Basin/sink waste outlet
The sink itself has a waste outlet that compresses against the sink underside with a rubber washer and plumber's putty. Over years the putty dries out and the seal weeps. We re-seat with fresh putty and a new washer.
Frequently asked
Under-Sink Plumbing Repair — your questions, answered.
Areas we cover
Under-Sink Plumbing Repair — local to you
- Leicestershire
- Warwickshire
- Birmingham
- Coventry
- Staffordshire
- Derbyshire
- Nottinghamshire
- Northamptonshire
- West Midlands
Based in Dadlington, covering the wider Midlands daily.Check your postcode →
Fix the Leak — Before the Cupboard Goes.
Most under-sink leaks fixed in under 90 minutes, with a 12-month guarantee on every joint.
Same-day attendance available across Leicestershire & Warwickshire