How to Price a Plumbing Leak Repair: Detection, Access and Repair Rate Guide

Quick Answer: A typical UK plumbing leak repair in 2026 prices £75–£150 for the call-out plus £55–£95 per hour for the repair itself, with most leaks resolved in 1–3 hours. Where the leak is concealed, thermal imaging detection adds £180–£380 and trace gas detection £280–£550 — both usually claimable under the buildings-insurance "trace and access" clause. The repair-cost split is roughly one-third detection, one-third repair, one-third access reinstatement (chasing wall, lifting floor, replastering, redecorating).

Summary

Leak repair is the most heterogeneous job in domestic plumbing. The headline charge for a visible compression-joint leak under a sink is £75–£150, takes 30 minutes, and needs a single olive and a tightening. The same trade-name on a concealed leak under a tiled shower tray runs £600–£1,800 once you add detection, tile lift, tray relift, and reinstatement — for the same £8 olive. Pricing this job honestly requires breaking the quote into three distinct parts: detection, repair, and reinstatement. Quoting a single fixed price is how the homeowner ends up at £400 for a visible leak and £150 for a hidden one — neither reflects the actual work.

The single most common mistake is conflating leak repair with leak detection. They are different jobs. Detection finds the leak — visually, by thermal imaging, by trace gas, or by acoustic listening. Repair fixes it. Reinstatement makes good the structural damage caused by accessing the leak. Most insurance policies cover the trace-and-access cost (sometimes capped at £5,000–£10,000) as a separate line from the repair cost itself, so getting the bookkeeping right matters for the homeowner's claim.

The water-damage clock starts the moment the leak begins. A 1 mm pinhole in a pressurised hot pipe drips at roughly 1–2 L per hour — that's 24–48 L per day, soaking through plasterboard ceilings, lifting parquet, swelling MDF skirting, and growing mould within 48–72 hours. Quote turnaround time matters more than headline price; a £200 quote that takes 4 days to start is more expensive in damage than a £400 same-day call-out.

Key Facts

Quick Reference Table

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Leak type Typical detection Repair cost Reinstatement Total
Visible compression joint (under sink) None — visible £80–£180 None £80–£180
Pinhole pinhole soldered joint (visible) Visual £150–£320 None £150–£320
Push-fit O-ring failure (accessible) Visual £80–£200 None £80–£200
Toilet pan gasket leak (visible at base) Visual £180–£380 Caulk, no major £180–£420
Concealed pipe in stud wall Thermal £180–£380 £150–£350 £180–£500 patch + decorate £510–£1,230
Under shower tray (mixer feed leak) Thermal £180–£380 £200–£500 Tray relift £300–£700 + retile £200–£500 £880–£2,080
Under suspended timber floor Thermal/acoustic £200–£450 £180–£420 Floorboard lift £80–£200 + finish £100–£300 £560–£1,370
Under solid concrete floor Acoustic + tracer £350–£700 £400–£900 Chase + concrete + flooring £400–£1,200 £1,150–£2,800
In ceiling void (above plasterboard) Thermal £180–£380 £200–£500 Plasterboard cut + skim + decorate £180–£600 £560–£1,480
External supply pipe (between meter and house) Acoustic + tracer £400–£800 £300–£900 Excavate + reinstate paving/lawn £200–£800 £900–£2,500

Detailed Guidance

Call-out, hourly rate and the first-hour minimum

Most plumbers charge a call-out fee plus an hourly rate. The call-out is a flat fee for turning up — typically £75–£150 in working hours, £150–£280 out-of-hours. Some firms include the first 30 minutes or first hour in the call-out; others charge it separately. Quote clarity here matters because the homeowner sees a £85 call-out and assumes that covers the work.

Hourly rates rise with skill, qualification, and time of day:

Most firms apply a one-hour minimum charge: even if the leak is fixed in 15 minutes, the homeowner pays for an hour. This isn't padding — it reflects travel, parking, equipment, and the fact that the engineer cannot economically chain 15-minute jobs.

Detection methods — what each costs and what they do

Detection is paid separately from repair when the leak is concealed. The four mainstream methods:

Visual / dye-test — included in the call-out. Plumber inspects under sinks, behind appliances, around the cylinder, listens for hiss, runs each fixture in turn. Effective for 60% of household leaks.

Thermal imaging — uses a FLIR-style infrared camera to find temperature differentials. Hot leaks show as a warm patch on a cold wall; cold leaks show as a chill patch behind plasterboard. £180–£380 typical fee for a competent operator with a calibrated camera. Needs a temperature differential — works well in winter, less well in summer when ambient and pipe temperatures match. Ineffective for cold-water leaks in unheated spaces.

Trace gas (hydrogen or helium) — a non-toxic gas mix is injected into the depressurised pipe. The engineer sniffs along the pipe run with a sensitive sensor that detects the gas escaping at the leak point. £280–£550 for a domestic trace. The most reliable method for confirmed-but-not-located leaks under solid floors. The pipework must be drained and isolated for injection.

Acoustic / correlator — sensors placed at two points on a metallic pipe correlate the noise of escaping water to triangulate the leak position. £200–£450 typical. Highly effective for pressurised mains leaks, less so for low-pressure heating returns or non-metallic pipework.

For most concealed domestic leaks, thermal imaging is the first call. If thermal fails (no temperature differential, or location is in a heated space), trace gas is the follow-up. Acoustic is reserved for buried mains supply leaks.

Common leak types and their repair patterns

Compression joint — the most common visible failure. The olive (small brass ring inside the nut) deforms or the nut backs off. Repair: drain the section, undo nut, replace olive, retighten with PTFE tape on the threads. Cost £80–£180. 30–60 minutes including isolation.

Soldered joint pinhole — corrosion eats through copper from inside, usually within 1 cm of a soldered fitting where flux residue accelerated dezincification. Repair: cut out the affected section, fit a slip-coupler (push-fit) or solder a new section. Cost £150–£320. 1–2 hours including drain-down.

Push-fit O-ring failure — the rubber O-ring inside a JG SpeedFit, Hep2O, or similar push-fit fitting hardens, splits, or fails to seal. Repair: pull the pipe out (requires the demount tool), inspect the O-ring, replace the fitting if the O-ring is damaged. Cost £80–£200. 30 minutes typically. Push-fit leaks are most common at year 8–15.

Soil pipe gasket — the wax-ring or rubber gasket between toilet pan and soil pipe degrades, causing slow seepage at the floor base. Repair: lift the toilet, scrape old gasket, fit new wax ring, reset and recaulk. Cost £180–£380. 1–2 hours including waste flange inspection.

Washing machine inlet hose burst — typical end-of-life failure at year 5–10. Hose splits, sprays cold water at mains pressure. Repair: isolate at washing machine valves, replace both inlet hoses (always replace both — the second is usually weeks behind the first), check shut-off valves. Cost £80–£180. 30 minutes. Recommended preventive replacement at year 5.

Lead pipe failure — older properties (pre-1970s) on lead service pipes develop pinholes from age and tap-fitting strain. Lead pipe must be replaced with 25 mm MDPE under modern Water Regulations. Cost £450–£1,200 for a typical service-pipe upgrade — see Water Supply Regulations 1999 and lead pipe replacement for the regulatory context.

Radiator / TRV body leak — wear on the gland nut or pinhole at the radiator. See leaking radiator diagnosis decision tree for the in-place repair routes.

Trace-and-access — getting the insurance claim right

Most UK buildings insurance policies include "trace and access" cover for water-leak damage. The clause typically covers the cost of:

The clause does not cover the repair itself (the new pipe section, the new fitting). That's a separate item, usually paid by the homeowner.

Trace-and-access is typically capped at £5,000–£10,000 per claim. Higher-spec policies extend to £20,000+. The homeowner needs the plumber to itemise the invoice clearly — detection on one line, repair on a second line, reinstatement on a third — so the loss adjuster can pay the trace-and-access portion under that clause.

A typical claim flow:

  1. Homeowner notices ceiling stain, calls insurer
  2. Insurer engages a leak detection contractor (or homeowner appoints their own and seeks reimbursement)
  3. Contractor finds the leak, issues invoice with detection / repair / reinstatement lines
  4. Loss adjuster approves trace-and-access portion against the policy cap
  5. Contractor or builder undertakes reinstatement (replaster, retile, redecorate)
  6. Insurer pays direct or homeowner is reimbursed

Plumbers who routinely do leak work understand this flow and produce invoices loss-adjusters can process without query. The homeowner saves significant time when the invoice is clear.

Material choice — copper vs plastic vs lead

Repair material affects both cost and longevity:

For repairs on existing systems, match the existing material where possible. A push-fit fitting will accept copper pipe; copper push-fit slip couplers are an excellent emergency repair on a leaking soldered joint without re-soldering. See compression fittings vs push-fit vs solder selection for the application guide.

Reinstatement allowance — the line homeowners forget

When the leak is concealed, reinstatement is often the single largest cost item. Three illustrative scenarios:

Behind plasterboard wall — chase 200 × 200 mm, fit new pipework, fill, skim, redecorate the affected wall panel. Materials £40–£80; labour 2–4 hours; redecoration of full wall panel £80–£180. Total £180–£500.

Under tiled shower tray — lift tile around tray, lift tray, repair pipe, refit tray with new bedding, re-tile, re-grout, re-silicone. Materials £180–£400; labour 4–8 hours. Total £400–£900.

Under solid concrete floor — saw-cut the concrete, jackhammer access, repair pipe, infill with new concrete to match level, retile or refloor. Materials £80–£250; labour 4–8 hours. Total £400–£1,200.

A clear quote names the reinstatement allowance separately from the repair. A vague quote rolls it into the headline number — and the homeowner then quibbles over whether the redecoration should have been included.

When the leak is in the gas pipe

Gas-pipe leak is a wholly separate trade and a Gas Safe registered engineer is mandatory. Common indicators: gas smell, hissing at fitting, soap-test bubbles. A gas leak is treated as an emergency — call the National Gas Emergency Service on 0800 111 999 (24h) before calling a plumber. The emergency service makes the gas safe; the Gas Safe engineer fixes the pipe. See gas tightness testing procedure for what the engineer does on arrival.

Gas-leak repair costs £150–£450 typical for a single fitting replacement; £400–£1,200 for a section of pipe replacement.

Frequently Asked Questions

How much does it cost to find and fix a hidden leak?

For a concealed leak in a stud wall, expect £510–£1,230 total: thermal imaging £180–£380, repair £150–£350, reinstatement £180–£500. Under a tiled shower tray, £880–£2,080. Under a solid concrete floor, £1,150–£2,800 — the access reinstatement is the biggest line.

Will my insurance cover the repair?

Most UK buildings policies cover trace-and-access (locating and reinstating after a leak) but not the repair itself. So the £180–£380 thermal imaging fee, the £180–£500 plaster reinstatement, and the £200–£500 retile would typically be claimable; the £150–£350 actual pipe repair would be the homeowner's cost. Check your policy schedule for the trace-and-access cap (commonly £5,000) and excess.

How quickly should a plumber respond to a leak?

Same day for active leaks — a dripping pipe causes 24–48 L of water damage per day. Most reputable firms offer same-day call-out within working hours and 24-hour emergency cover at premium rates. The homeowner's first action should be to isolate the supply at the property stop-cock (usually under the kitchen sink or in a garage) before the plumber arrives.

Can I just fix a small leak myself?

A visible compression-joint leak is within DIY scope: isolate, drain, remove nut, replace olive, retighten. Push-fit and soldered repairs require either a tool or torch and a higher skill level. Solid-floor and concealed leaks are not DIY — the access work alone risks pipe damage and structural damage. For any insurance claim, professional invoices are usually required for reimbursement.

What's the difference between a slow leak and a burst?

A slow leak is a steady drip or weep that loses 0.5–5 L per day — typically a degraded olive, hardened O-ring, or hairline pinhole. A burst is a structural failure of pipe or fitting that loses 10–500 L per hour. Bursts are emergencies; slow leaks are urgent. Both warrant same-day attention but bursts need the supply isolated immediately.

Regulations & Standards