What your Build Over Agreement package includes
A complete Build Over Agreement submission typically includes:
- Drainage layout drawings (existing & proposed)
- Sewer location mapping using water authority records – *waterboard fees may apply
- Manhole relocation or sealing details
- Foundation design to protect the sewer
- Section drawings showing clearance distances
- Method statements for safe construction
- Water authority application forms completed
- Liaison with Thames Water, United Utilities, Severn Trent, Anglian Water, etc.
All documents are produced to water authority standards and accepted nationwide.
Our process
A clear, coordinated workflow from start to approval:
- Review of plans & sewer records We identify sewer positions, depths, and risk factors.
- Build Over drawings Plans, sections, and foundation details are prepared.
- Application preparation All forms, drawings, and supporting documents are compiled.
- Submission & liaison We submit to the water authority and respond to any queries.
Fees
Typical fees start from:
- £295–£495 for simple Build Over submissions
- £495–£895 for extensions requiring structural details
- £895+ for complex drainage diversions or deep sewers
A fixed quote is provided after reviewing your drawings and sewer records.
Borough & water authority considerations
While Build Over rules are national, each authority has its own scrutiny points:
- Thames Water — strict on manhole relocation and deep sewers
- United Utilities — detailed structural protection requirements
- Severn Trent — CCTV surveys often mandatory
- Anglian Water — careful review of clay pipe protection
- London boroughs — high density of shared Victorian drains
- Manchester & Lancashire — frequent shallow shared sewers
- Kensington & Chelsea — basement works require enhanced drainage protection
Your package is tailored to your authority, sewer type, and construction method.
Common mistakes to avoid
Applications are often delayed or rejected when:
- Sewer location is incorrect or unverified
- Drawings lack foundation or bridging details
- Manholes are left beneath extensions
- Builders rely on planning drawings instead of technical drainage drawings
Planning World eliminates these risks with a fully compliant, coordinated submission.
