Blocked Drain or Broken Pipe? How to Tell the Difference

Most of the calls we get are straightforward blockages — something's stopping the flow, and clearing it sorts the problem. But every so often, what looks like a blockage is actually a broken, cracked or displaced pipe, which needs a different fix entirely. Here's how to tell which you're likely dealing with.

Signs it's probably a blockage

A blockage tends to affect a single fixture at a time — one sink, one toilet, one outside gully — rather than the whole system. It usually builds up gradually, with drainage getting slower over a few days before stopping altogether, and it's often accompanied by gurgling as trapped air works its way past the obstruction. Critically, a straightforward blockage generally clears with rodding or jetting and doesn't come straight back.

Signs it's more likely a broken pipe

A few patterns point towards something structural rather than a simple blockage. If the same spot blocks again within weeks of being cleared, that's a strong signal — a clear pipe doesn't reblock itself, but a cracked or root-damaged one will keep catching debris in the same place. Soft, sunken or unusually green and lush patches of ground above a drain run can indicate a leak feeding the soil underneath. A smell that persists even once the drain is flowing again, or multiple fixtures backing up at once, both point further up the chain than a simple blockage would.

Why a CCTV survey settles it

Trying to diagnose a pipe from the surface is guesswork either way. A CCTV drain survey puts a camera through the actual run and shows exactly what's there — a clear pipe with a one-off blockage, root ingress, a cracked joint, or a section that's dropped out of alignment. It turns a guess into a decision, and if it does turn out to be a structural problem, the recording makes it straightforward to plan the repair properly rather than digging speculatively.

What to do next

If your drain keeps coming back to the same problem, or something about it doesn't feel like a normal blockage, it's worth having a survey done rather than paying for repeat clearances. Email us what you're seeing and we'll tell you honestly whether a survey is the right first step.