Compare quotes from multiple verified Woolwich plumbers
Your enquiry goes straight to the plumbers you pick — no middleman fee
A rising water bill, a warm patch of floor, damp that keeps coming back — a hidden leak rarely announces itself. Finding it without tearing the house apart, and working out whose pipe it is, is the whole job.
✅ Checked before listing — identity, insurance, trading presence, Gas Safe (where relevant). How we verify →
✅ Workmanship guarantee badges on listings — 1, 3, 6 or 12 months
No customer-side introduction fee and no pay-to-play ranking — just Woolwich plumbers checked before they’re listed.
Contact verified leak detection specialists in Woolwich ↓
Are you a plumber covering Woolwich?
Use the search above to find a local expert
The signs of a hidden leak in a Woolwich home
Most hidden leaks are found by their side-effects long before anyone sees water. The classic tell is a water bill that climbs with no change in use. Others are subtler: a patch of floor that’s warm underfoot over a heating pipe, a musty smell in a cupboard, paint that blisters low on a wall, or the sound of running water when every tap is off.
A quick self-check that works in any tenure: turn everything water-using off, find your stop tap, and watch your meter. If the meter keeps ticking, water is escaping somewhere between the meter and your taps. Thames Water uses a version of this logic for supply problems — it suggests checking whether water comes from the cold kitchen tap but nowhere else, which points to internal plumbing rather than the network. Our find your stop tap guide shows exactly where to look.
Whose pipe is it? Drawing the responsibility line
This is where a good leak detection job earns its money, because chasing the wrong pipe wastes everyone’s time and money. The dividing line runs at your boundary and your stopcock.
On the clean-water side, once water is inside your boundary and serving only your property, the internal plumbing is yours to fix — Thames Water directs residents with an internal supply issue to an approved plumber or their landlord. On the waste side, Thames Water owns public sewers and any drains shared with neighbours, even where they run under your garden, while a drain serving only your home inside your boundary is yours.
If you’re a Royal Greenwich leaseholder, the line is drawn even more precisely: the council makes you responsible for pipes that only serve your home — after the stopcock — while it keeps the pipes running up to your home, up to the stopcock. A leak detection specialist who establishes which side of the stopcock the leak sits on can save you from paying for a repair that isn’t yours — and importantly, the council also holds leaseholders responsible for leaks going into other properties and the damage they cause, which is exactly why early detection matters in a flat.
Older Woolwich stock: lead pipes and pinhole leaks
Woolwich isn’t only new-build glass and steel. Behind the town-centre and the conservation areas there’s a lot of older fabric, and older fabric brings older pipe. Thames Water notes that lead in water pipes has been banned since the 1970s and homes built after 1970 are unlikely to have it, but that an older property may still have a lead pipe feeding it or lead in the internal plumbing.
For leak detection, old pipe matters twice over. Lead and early copper corrode and develop pinhole leaks that weep rather than gush — precisely the kind that hide behind plaster for months. And Thames Water gives a clear way to identify lead: an unpainted lead pipe is a dull grey, its joints are rounded and swollen, and it makes a dull thud when tapped rather than a ring. If a specialist finds lead while tracing a leak, replacement — not just patching — is usually the right conversation, and Thames Water runs a lead pipe replacement scheme worth asking about. Our Victorian terrace plumbing guide goes deeper on old-stock pipework.
Royal Arsenal Riverside: when a “leak” is on the heat network
If you live in one of the Royal Arsenal Riverside apartments, a heat or hot-water problem may not be a plumbing leak at all. The scheme operator, SSE, describes each home as regulated by a heat interface unit, removing the need for individual gas boilers and hot water storage, and confirms it maintains and repairs those HIUs and the energy centre under a long-term contract.
That changes what a leak means. Weeping or a pressure drop on the heat-network side of the HIU is the operator’s or managing agent’s responsibility, not something to fix as ordinary domestic pipework. A genuine leak on the cold-water plumbing or on radiators inside your flat can still be a plumber’s job, subject to your lease. A specialist who knows the difference won’t try to “repair” something they shouldn’t touch — and won’t charge you for it.
How leak detection actually works
Good detection is deliberately non-destructive — the goal is to pinpoint the leak so only a small area is opened up. Specialists build a picture using acoustic listening equipment that hears water escaping under floors, thermal imaging that reads the temperature difference a hidden pipe creates, tracer gas introduced into a drained system, and moisture meters to map where water has travelled. Pressure-testing an isolated section confirms whether a run is losing water at all.
The value is in avoiding the alternative: lifting every floor and opening every wall on a guess. For a leaseholder or a landlord, a documented trace also matters for responsibility and insurance — it shows exactly where the leak was and whose pipe it sat on.
Hard water is why Woolwich pipes fur up
Woolwich sits in Thames Water’s supply area, and Thames Water is clear that all the water in its region is hard, because it passes through chalky limestone. Hard water leaves limescale, and over years that scale narrows pipe bores, leaves scale and deposits inside pipes and fittings.
You can’t soften the mains, but you can manage the effects. Thames Water suggests running hot water at around 60°C and, if you fit a softener, installing a separate tap and having the unit inspected regularly by an approved plumber. Our London hard water guide explains what scale does to a plumbing system over time.
Why verified plumbers in Woolwich
Leak detection is a trust-heavy job — you’re paying someone to tell you what’s happening inside your walls, and you can’t easily check their work yourself. That’s exactly why verification matters here. Every specialist listed is checked before they appear: identity, insurance and trading presence, with Gas Safe registration confirmed where any gas work is involved, and re-checked each year. Because plumbers pay a flat monthly listing fee, there’s no customer introduction fee and no pay-to-play ranking deciding who you see first. Workmanship-guarantee badges show whether a plumber backs the repair for 1, 3, 6 or 12 months — useful when a “fixed” leak needs to stay fixed.
Frequently asked questions
Turn everything off, find your stop tap, and watch your water meter.
If it keeps moving with no water in use, something is leaking between the meter and your taps.
A rising bill, unexplained damp or a warm patch of floor are the common early signs.
If it’s on your side of the boundary and serves only your home, it’s yours.
Thames Water is responsible for its public network and for drains shared with neighbours.
A detection specialist can establish which side of the line the leak sits on.
For a leak on pipework that only serves your home, after the stopcock, Royal Greenwich makes leaseholders responsible.
A leak on the pipes up to your home, up to the stopcock, is the council’s.
A documented trace showing where the leak sits is what settles it.
Maybe not.
Those homes use a shared heat network with a heat interface unit rather than a boiler, so a fault on the heat-network side goes to the managing agent or heat supplier.
A leak on your own cold-water pipes or radiators can still be a plumber’s job.
Not directly, but over years limescale from Woolwich’s hard water builds up inside pipes and fittings, narrowing the bore and leaving deposits.
Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor, 20+ years’ experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗