Mainline Drains
Excavation of a collapsed drain pipe by professional drainage engineers

Collapsed Drain Under Patio

Drains running beneath patios are susceptible to collapse from ground movement, tree root damage, and the weight of heavy paving. A collapse can cause patio slabs to sink, crack, or become unstable, and may allow sewage to leak into the surrounding ground.

What to Look For

  • Patio slabs sinking or becoming uneven
  • Cracks appearing between or through patio slabs
  • Foul smells around the patio area
  • Waterlogged areas around the patio edge
  • Ants or insects emerging between slabs
  • Green algae growth in specific areas indicating moisture

How We Diagnose the Problem

We use CCTV drain cameras to inspect the pipe beneath the patio and determine the type and extent of damage. Drain tracing helps us pinpoint the exact position without unnecessary excavation.

Think you might have collapsed drain under patio? A professional inspection will confirm the diagnosis.

How We Fix It

We lift only the slabs needed to access the collapsed section, replace or reline the damaged pipe, and carefully reinstate the patio. Where possible, no-dig relining avoids the need to disturb the surface at all.

Need a Professional Inspection?

If you're experiencing persistent issues, don't wait for the problem to worsen. Our engineers use proven methods to diagnose accurately. Call for emergency response or book a scheduled inspection.

Patio slabs sinking? Get a CCTV survey to check for a drain collapse underneath.

Collapsed Drain Under Patio FAQ

What are the signs of collapsed drain under patio?
Patio slabs sinking or becoming uneven. Cracks appearing between or through patio slabs. Foul smells around the patio area.
How do you diagnose collapsed drain under patio?
We use CCTV drain cameras to inspect the pipe beneath the patio and determine the type and extent of damage. Drain tracing helps us pinpoint the exact position without unnecessary excavation....
How do you fix collapsed drain under patio?
We lift only the slabs needed to access the collapsed section, replace or reline the damaged pipe, and carefully reinstate the patio. Where possible, no-dig relining avoids the need to disturb the sur...

Need an Expert?

Get in touch today for a free, no-obligation quote. Our team is ready to help — 24/7.