Does a Home Extension Require a Party Wall Agreement?

In many cases — yes.

If your home extension involves building on or within 3meters of a shared boundary, altering a party wall, or excavating close to your neighbour’s property, you’ll need a Party Wall Agreement under the Party Wall etc. Act 1996.

This legal agreement protects both you and your neighbours by setting out how the works will be carried out, helping to prevent disputes and delays once construction begins.

At Excela Architecture London, we make the process straightforward. Our experienced team handles everything from:

– Assessing whether your project requires a Party Wall Agreement

– Producing the detailed Party Wall agreement documents.

Our Party Wall Agreements from just £350, we provide a fast, affordable, and compliant service — ensuring your home extension or loft conversion can move forward without unnecessary conflict or delay.

Whether you’re at the design stage or ready to start construction, Excela Architecture London will guide you through the entire Party Wall process with clarity and confidence.

Party Wall Agreement FAQs

How do I know if my project needs a Party Wall Agreement?

You’ll likely need one if your extension or loft conversion involves building on or near a shared boundary, altering a shared wall, or excavating within three or six metres of a neighbouring structure. Our team will review your plans and confirm your requirements before any notices are served.

Who pays for the Party Wall Agreement?

In most cases, the building owner (the person carrying out the work) covers the cost of the Party Wall process — including surveyor fees. This ensures your neighbours are not financially disadvantaged by your proposed works.

How long does a Party Wall Agreement take?

From start to finish, the process can take anywhere between 1 to 3 weeks, depending on the complexity of the proposed building works. Excela Architecture London manages the entire process efficiently to help avoid unnecessary delays.

What happens if I start building without a Party Wall Agreement?

Starting work without a valid agreement can result in legal action, stop notices, or claims for damages. It’s always best to have your agreement in place before construction begins — we make sure it’s handled properly from the outset.

How can Excela Architecture London help?

We provide Party Wall Agreements from just £350, ensuring that all details are covered in the Part Wall Agreement Document. Our integrated approach ensures your project remains compliant, protected, and ready to build — all with minimal stress and clear communication throughout.