What to Do in a Plumbing Emergency

In a real plumbing emergency, the first three minutes matter more than the next three hours. Knowing where your stopcock is, which way it turns, and what to do before the engineer arrives can be the difference between a damp patch and a ceiling on the floor. This guide walks through the practical steps for the most common emergencies — burst pipe, leaking ceiling, no hot water, suspected gas leak, and blocked drain — and what to tell the plumber so they arrive ready.

The single most important thing: know your stopcock

Your main stopcock controls the cold water supply into the property. Closing it shuts off all internal plumbing. In most Peterborough homes it's located:

• Under the kitchen sink, on the rising main
• In a utility room or under-stairs cupboard
• In the garage or boiler cupboard in some newer builds
• Occasionally in the front garden, in a buried box marked "stopcock"

Find it now, before you need it. Test it by turning the tap clockwise — it should close after a few full turns. If it's stiff or won't move, exercise it gently or get it replaced. A seized stopcock during a burst pipe is a costly problem to discover too late.

The external stopcock (in a small box at the property boundary or pavement) controls the supply from the water main to your property. Use the internal one first — it's faster and you don't need a tool.

Emergency 1: Burst pipe or major leak

Sudden water spraying from a pipe, or pooling under a basin, sink, or radiator.

1. Turn off the internal stopcock immediately. Don't try to find the source first.
2. Open all cold taps downstairs (kitchen, utility) to drain the rising main and reduce the pressure feeding the leak.
3. Turn off the boiler at its electrical isolator. This prevents the boiler from drawing water from an empty system and damaging itself.
4. If the leak is hot water — also open hot taps to drain the cylinder if you have one.
5. Contain the leak with towels, buckets, or anything that catches water. If a ceiling is bulging, make a small hole at the lowest point to drain the water into a bucket — better than the whole ceiling collapsing.
6. Turn off electricity to any room where water is dripping through ceilings or running near sockets.
7. Photograph everything for your insurance claim.
8. Call an emergency plumber — see our 24/7 emergency service.

If you can isolate the leak with a service valve nearer to the appliance (most modern basins and radiators have isolation valves on the supply pipes), do that — it lets you restore water to the rest of the house while waiting for the engineer.

Emergency 2: Water coming through the ceiling

A bulging or dripping ceiling almost always means a leaking pipe or appliance directly above.

1. Turn off the internal stopcock — same as a burst pipe
2. Catch the water with buckets, basins, and towels
3. Pierce a small hole in the lowest sag with a screwdriver or kitchen knife. Counter-intuitive but it prevents the ceiling collapsing under the weight of trapped water. Use a bucket directly underneath.
4. Turn off electricity to that floor if there's any risk of water reaching ceiling lights or sockets
5. Move valuables and electronics out of the affected area
6. Call for help — see our guide to water through the ceiling for what happens next

Emergency 3: No hot water

Less time-critical than a leak, but treat it as urgent if it's winter or there are vulnerable residents.

1. Check the boiler display for error codes — note them down before doing anything else
2. Check system pressure on the gauge. Most boilers want 1.0–1.5 bar cold. Below 0.5 bar and the boiler will refuse to fire.
3. If pressure is low, top up via the filling loop (silver braided hose underneath) and reset the boiler
4. If the boiler shows no display at all, check the fused spur and the consumer unit
5. If you have a system or conventional boiler, check the cylinder thermostat hasn't tripped (small reset button on the side of the cylinder)
6. If none of this works, call an engineer — see our no hot water guide for the longer diagnosis

Emergency 4: Suspected gas leak

If you smell gas in or around the property:

1. Don't switch any electrical appliance on or off — including light switches, mobile phones, doorbells. A spark can ignite leaked gas.
2. Open all windows and doors to ventilate
3. Turn off the gas at the meter if you can reach it safely — there's a lever on the supply pipe that turns 90 degrees to off
4. Leave the property
5. Call the National Gas Emergency line on 0800 111 999 — they attend within an hour, free, 24/7
6. Don't return until they've confirmed it's safe

This is not something for your usual plumber — the National Gas Emergency service has the authority to isolate and seal the supply at the network level. Once the leak is identified, they'll seal off the affected appliance and a Gas Safe engineer (like ours) can then repair or replace it.

Emergency 5: Blocked drain or overflowing toilet

Less catastrophic than a burst pipe but still needs prompt action.

1. Stop using the affected fixture immediately
2. For an overflowing toilet, lift the cistern lid and close the flapper or push the float down to stop the inflow
3. Don't pour drain unblocker products down if there's standing water — they often make the problem worse and create chemical exposure risks for the engineer
4. Check the external drains at the property boundary — if water is backing up into the soil stack or the inspection chamber is overflowing, you may have a main drain blockage requiring rodding or jetting
5. Photograph everything and call for drain blockage help

What to tell the plumber when you call

The faster the engineer understands the situation, the faster the right help arrives. When you call, have these ready:

• Your address and postcode
• What's happening — burst pipe, no hot water, blocked toilet
• Whether you've turned off the stopcock or boiler
• Whether the property is still occupied or you've evacuated
• Any error codes shown on the boiler
• Whether there's electricity near water
• How accessible the relevant area is (loft, under floors, behind boxed pipework)

What it costs

Emergency call-outs in Peterborough typically run £90–£150 for the first hour during working hours, with parts and additional time charged on top. Out-of-hours rates (evenings, weekends, bank holidays) are usually 1.5–2x daytime rates. See our pricing page for current rates.

Cheap call-out rates often mean expensive hourly rates — always ask for the total estimate over the phone before agreeing to dispatch. We give fixed quotes wherever possible and never charge for the call itself.

Prevention is cheaper than emergency

Most plumbing emergencies are preventable. The biggest avoidable causes we see in Peterborough are:

• Frozen pipes in uninsulated lofts and external walls — see our guide on preventing frozen pipes
• Old isolation valves that seize over time and fail when needed
• Limescale build-up in tap cartridges and shower heads
• Slow weeping joints that suddenly let go
• Boiler pressure relief discharge ignored until the expansion vessel completely fails

An annual plumbing health check catches most of these before they become 2am phone calls. See our what to do before the emergency plumber arrives guide for additional steps that minimise damage while you wait.