A blocked drain rarely happens overnight. In most London homes, it builds up gradually — a little grease here, some hair and debris there — until one day the sink won’t empty or the toilet won’t flush properly. Catching the warning signs early can save you from a full-blown emergency, a flooded bathroom, or an expensive out-of-hours call-out.
Here are seven signs that your drains need attention before they fail completely.
1. Slow-Draining Sinks and Baths
If water lingers in your sink, bath, or shower tray longer than it used to, that’s usually the first sign of a blocked sink or partial blockage further down the pipework. It’s easy to ignore at first, but a slow drain almost always gets worse, not better, on its own.
2. Gurgling Noises From Pipes
Strange gurgling or bubbling sounds coming from your drains, toilet, or plughole are a classic symptom of trapped air caused by a blockage. As water tries to force its way past an obstruction, air gets pushed back up through the system — and that’s the noise you’re hearing.
3. Unpleasant Odours
A persistent bad smell from a sink, drain, or outside gully is often a sign that waste is trapped and starting to decompose. This is one of the most common reasons Londoners call an emergency drain unblocking service, particularly in older Victorian properties where drainage runs are more complex.
4. Water Backing Up
If water rises back up through a plughole when you run a tap elsewhere in the house, or your toilet bowl fills higher than normal after flushing, that’s a strong indicator of a blockage further along the shared drainage system — not just the fixture itself.
5. Blocked Toilet That Won’t Clear
A blocked toilet that repeatedly needs plunging, or won’t flush at all, is more than an inconvenience — it can indicate a blockage in the main soil pipe. Repeated blockages in the same spot are a sign it’s time to call a professional rather than keep reaching for the plunger.
6. Damp Patches or Puddles Outside
Unexplained damp patches, puddles, or soggy areas in the garden or near manhole covers often point to a blocked or damaged drain beneath the surface. Left unresolved, this can lead to structural damage or subsidence over time.
7. Multiple Fixtures Affected at Once
If more than one drain in the house is playing up at the same time — for example, the kitchen sink and the bathroom both draining slowly — this usually means the blockage is in a shared pipe rather than an isolated fixture, and it needs proper diagnosis.
How We Diagnose and Fix Blocked Drains
At London Emergency Drainage, we don’t guess. For anything beyond a simple surface blockage, our engineers use a CCTV drain survey to see exactly what’s happening inside the pipe — tree root ingress, a collapsed section, grease build-up, or a foreign object — before recommending a fix.
Depending on what we find, that fix might be:
- High-pressure jetting to clear grease, scale, and debris from the pipe walls
- Manual rodding for simpler blockages
- Drain repairs and relining if the pipe itself is damaged or cracked
Every job comes with a fixed price agreed before we start — no surprises on the invoice.
When to Call an Emergency Drainage Engineer
If you’re seeing more than one of the signs above, don’t wait for the drain to fail completely — especially overnight or over a weekend, when a small blockage can turn into a flooded kitchen or bathroom. Our engineers are on call 24/7 across all 32 London boroughs, with an average arrival time of around 60 minutes.
Call 020 8064 0422 for a fast, fixed-price callout, any hour of the day.