Build Over Agreement Services in London
Securing a Build Over Agreement is a critical legal requirement when your construction project is located over or near a public sewer. Whether you are planning a rear extension, a new outbuilding, or a garden room, obtaining this formal approval from the water authority ensures that your development is completely lawful and does not compromise essential infrastructure. Navigating this process can feel like walking through a legal minefield, but our professional architectural services provide the technical roadmap and deep expertise needed to protect your investment.
What is Build Over Agreement?
A Build Over Agreement is a formal legal document issued by your local water authority that confirms your proposed works are safe to be built near their assets.
- Legal Certainty: It provides formal confirmation from the authority that your development complies with their specific regulations.
- Asset Protection: This agreement acts as your shield against future enforcement action, such as the authority requiring access to the sewer at your expense.
- Technical Verification: The process involves an expert assessment of your drainage and foundation designs to ensure the sewer remains protected.
- Essential for Property Confidence: This isn’t just paperwork; it is your guarantee that solicitors, mortgage lenders, and future buyers will have complete confidence in your property.
Types Of Build Over Agreement
Certificate of Lawfulness – Proposed Development
(CLOPUD)
Get legal peace of mind before you build. This certificate confirms that your planned extension, loft conversion, or outbuilding falls under “permitted development.” It’s a vital step for ensuring your investment is legally protected before work begins.
Certificate of Lawfulness: Existing Development
(CLEUD)
Formalize what’s already there. A CLEUD confirms that an existing structure or use of land is lawful. This is essential for works completed without prior planning permission that have been in place for more than four years (or ten years for changes of use).
When You Need Build Over Agreement Services
You typically require this professional service when your construction activities are within 3 meters of a public sewer. Common scenarios include:
- Rear or Side Extensions: When the footprint of your new extension crosses a shared drainage line.
- New Outbuildings: Constructing garden rooms, sheds, or garages over existing sewer pipes.
- New Build Developments: Designing foundations for new dwellings where public sewers are present on the site.
- Regularising Existing Works: Obtaining a retrospective agreement for works already completed without prior consent.
Our Build Over Agreement Process
We provide a streamlined service that combines technical expertise with deep knowledge of utility regulations to ensure your application is not refused.
Sewer & Property Assessment
We review your site plans and drainage history to assess the lawfulness of your project.
Drawings & Evidence Preparation
You will receive professionally prepared drawings, including detailed drainage layouts and foundation sections
Authority Submission & Liaison
We submit your application to the water authority and handle all technical correspondence on your behalf.
Agreement Issued
Once the process is complete, you receive the official legal paper confirming the work is authorized.
Why Choose Online Architectural Services
Navigate London’s planning regulations with confidence. Our experienced team handles all aspects of planning applications.
London Borough Expertise
Deep knowledge of all 32 London boroughs and their specific planning requirements
High Approval Success Rate
Proven track record of successful LDC applications across London
Council-Compliant Drawings
Professional architectural drawings that meet all local authority standards
Fixed Pricing
Transparent, competitive pricing with no hidden fees or surprises
Fast Turnaround
Quick preparation and submission to meet your project timelines
Related Services
Building Regulation Drawings
Compliant technical drawings for building control approval.
Build Over Agreement Frequently Asked Questions
Why do I need one?
You need it to confirm your development is legal under utility law and to protect yourself from future enforcement action.
Is it the same as planning permission?
No; planning permission grants approval for development, while this agreement confirms that your works follow water authority rules.
How long does the process take?
While authorities vary, the process typically follows a similar 8-week timeframe for review and decision.
What happens if I don't apply?
You may face enforcement action, delays during a property sale, or requests for expensive indemnity insurance from solicitors.