Get a build-over survey for your extension — fast
Extending over or within 3 metres of a public sewer? Your water company needs a CCTV condition survey before and after the build. We match you with a verified specialist who does them every week.
Free · No obligation · Under 2 minutes
A build-over agreement protects the sewer under or near your build — and the water company won't grant one without a CCTV condition survey. Get it done early and it never holds up the build; leave it late and it can stall sign-off.
The 3-metre rule
Building within 3 metres of a public sewer (or 1 metre of a lateral drain) needs a build-over agreement under Building Regs Part H4 — and the water company requires a CCTV survey to grant it.
Typical cost
Survey incl. report in required format (trade guides, 2026)
- Fixed quotes before anyone visits
- Qualifications & insurance checked
- Matched to up to 3 vetted specialists — not the whole market
Matched to a shortlist — not blasted to the market
We match you with up to 3 verified local specialists — never more — and send their quotes by email, so you compare a shortlist instead of fielding calls from a dozen firms.
UK drainage in numbers
The scale of the problem
Sources: Water UK, Ofwat and the ABI (2024–2025). Figures are UK-wide and rounded.
Good to know
Questions about build-over surveys
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