Build near drainage.
Plan it properly.
Design and technical support for extensions and structures proposed close to or over public sewers, coordinated around the relevant water authority requirements.
Drainage constraints need to shape the design before construction begins.
Building close to a public sewer can affect foundations, access and the approval route. We review the proposed work against the available drainage information and develop proportionate technical details for the agreed scope.
Early coordination helps avoid a layout or foundation solution that conflicts with the sewer position, depth or authority requirements.
Technical support for build-over applications
The required information depends on the sewer, proposed work and relevant water authority.
Drainage Information Review
Review of available sewer records, site information and proposed building position.
Build-Over Drawings
Plans and sections showing the relationship between the proposal and affected drainage.
Foundation Design
Proportionate foundation details developed around sewer position and depth.
Protection Details
Relevant bridging, clearance or protection principles for the agreed design.
Application Support
Preparation of agreed technical information for the authority process.
Design Coordination
Alignment between architectural layout, drainage constraints and structural requirements.
Clear information around the sewer and structure
The package is matched to the authority requirements and the information available.
Location information
Plans identifying the proposed work and relevant drainage route.
Relationship sections
Sections showing foundation depth, clearances and sewer position.
Structural details
Foundation or bridging information for the agreed design solution.
Supporting notes
Clear technical notes describing assumptions and proposed protection.
Four clear steps from enquiry to delivery
Share the proposal
Send the site address, drawings and any drainage records or survey information.
Review the sewer
The available position, depth and relationship to the work are assessed.
Coordinate the design
Layout and foundations are developed around the identified constraints.
Issue information
The agreed drawings and technical details are prepared for the application route.
Build Over Agreement, clearly explained
Straight answers about scope, information and project delivery.
What is a Build Over Agreement?
It is an agreement with the relevant water authority for qualifying building work over or close to a public sewer.
How do I know whether a sewer is public?
Drainage records and site information should be reviewed. Ownership and authority requirements depend on the specific drainage arrangement.
Can foundations cross a sewer?
The acceptable solution depends on sewer position, depth, condition and authority requirements. The design must be reviewed case by case.
Do you submit the application?
Application support can be included where expressly agreed, using the drawings and information available for the project.
Should this be resolved before construction?
Yes. The drainage relationship and required authority route should be established before affected foundations or building work begin.
Building near a public sewer or drainage route?
Share the drawings and drainage information for a coordinated technical response.