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Build Over Agreement
A Build Over Agreement is required when building work takes place over or near a public sewer. The agreement protects the sewer from damage during and after construction. It must be obtained from the water company before building work begins.
Water Industry Act 1991, Section 185Valid: One-off (per project)
What it covers
- Location of public sewer in relation to building
- Foundation design and protection measures
- CCTV survey before and after construction
- Agreement conditions and compliance
Who needs a Build Over Agreement?
Developers
Self-builders
Homeowners extending over a sewer
Manage your Build Over Agreement with CertBox
1
Upload the PDF
Upload your Build Over Agreement to CertBox against the right property.
2
Track expiry dates
Your dashboard shows when certificates need renewing.
3
Share via link
Send a secure link to landlords, agents, or Building Control.
Frequently asked questions about Build Over Agreement
How do I know if there is a sewer under my extension?
Check the public sewer map, available from your water company or on their website. Any sewer shown on the map within 3 metres of your proposed building may require a Build Over Agreement.
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