Build Over Agreement London Thames Water Engineers
- Admin
- Apr 14
- 3 min read
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A Build Over Agreement is a legally binding document in the UK that permits construction or alterations near existing public sewers, a mandatory documents before you can start construction for your extenion. It ensures that the structural integrity and proper functioning of the sewer network are maintained during and after construction activities wihtout compromising the integrity of the pipes.
When is a Build Over Agreement Necessary?
Typically, a Build Over Agreement is required when planning construction within 3 meters of a public sewer or buildin gover it. This includes extensions, new buildings, or any work that might affect the sewer infrastructure. However, certain situations may exempt you from needing such an agreement, such as:
Private Drains: If all sewers on your property are private, a Build Over Agreement may not be necessary unless building within 1 meter of where they connect to a public sewer. Then you need to provide relevant drawings to the water authority.
Diverting the Sewer: In some cases, it may be possible to divert the sewer around your construction area. This option requires professional design input and prior consent from the water compnay like Thames Water.
Application Process for a Build Over Agreement
Consultation with Water Authority: We will contact your local water company to determine if a Build Over Agreement is required for your project.
Preparation of Documentation: We will prepare detailed plans of your proposed development, including existing drainage layouts and structural details. We will provide the necessary drawings and calculations.
Submission of Application: We will act as you agent and submit the application form along with all required docBuild Over Agreement London Thames Water Engineersumentation and the application fee to your local water company.
Review and Approval: The water company will review your application, which may involve pre-construction surveys of the sewer like CCTV. Once approved, we can commence with construction, adhering to any conditions set out in the agreement.
Considerations and Restrictions
Manholes and Inspection Chambers: Manholes or inspection chambers should not be located inside the building as flooding might occur. If they are, they must be relocated outside the building's footprint as per the minimum required distances.
Sewer Depth and Proximity: The depth of the sewer influences the minimum distance foundations must be from it. For example, sewers up to 1.1 meters deep should have foundations at least 150mm away; deeper sewers require greater distances. We will prepare the relevant drawings as required.
Piled Foundations: Piled foundations are generally not permitted within 15 meters of a public sewer. This is a special design usually for larger projects.
Costs and Processing Times
Application fees vary by water company and sewer size classification. For instance, Thames Water charges £299 for Class 1 sewers (up to 160mm in diameter) when applying online. The approval process typically takes up to 21 days, provided all necessary information is submitted. We undertake the entire process from A to Z until approval, answering any technical questions that might arise.
In summary, obtaining a Build Over Agreement is a crucial step when planning construction near public sewers. It safeguards both your property and the public sewer infrastructure, ensuring that your development complies with legal and safety standards and building control.
Build over agreement London Thames water Ritzi Engineers
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