Drainage under buildings
Drainage sometimes runs under a building. Build-over consent and structural support may be required. We work with the structural and drainage design to excavate, support or divert as specified so the build can proceed safely.
The commercial value of resolving drainage under buildings early is fewer delays, clearer budgeting, and reduced repeat disruption.
review Groundworks Contractors in Manchester and Excavation Contractors in Glasgow.
When to consider this guidance
Teams usually investigate drainage under buildings when early warning signs start affecting reliability, compliance, or project timelines. This is often the point where decision makers move from observation into scoped technical action.
Common warning signs
The symptoms below are the most common triggers we see before diagnosis and repair planning.
- Drain under proposed building
- Build-over agreement from water company
- Support design from structural engineer
- CCTV survey of existing drain
- We deliver to consent and design
How this is usually carried out
We work from the build-over consent and structural design. We deliver the support or diversion as specified.
Think you might have drainage under buildings? A professional inspection will confirm the diagnosis.
Practical steps to a reliable outcome
We deliver groundworks and support for drainage under buildings. We coordinate with the structural and drainage team.
What affects cost and complexity
Cost and complexity usually depend on access constraints, total scope, existing condition, and whether related works need to be coordinated in the same programme window.
What the process looks like
We keep delivery structured so scope, sequencing, and sign-off remain clear.
Step 1: Initial assessment
What this step delivers: Root cause and scope are confirmed.
Step 2: Method planning
What this step delivers: Practical repair strategy is agreed.
Step 3: Delivery and verification
What this step delivers: Work is completed and validated.
We provide these services across the UK, including
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Building over a drain? We can deliver to consent and design.
Related Services
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Drainage under buildings FAQ
- What are the signs of drainage under buildings?
- Drain under proposed building. Build-over agreement from water company. Support design from structural engineer.
- How do you diagnose drainage under buildings?
- We work from the build-over consent and structural design. We deliver the support or diversion as specified....
- How do you fix drainage under buildings?
- We deliver groundworks and support for drainage under buildings. We coordinate with the structural and drainage team....
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