When a neighbour starts planning an extension in London, it can raise understandable concerns. You may be worried about noise, access, excavation, shared walls, foundations, damage, or whether the correct legal process has been followed. In many cases, nearby building work may fall under the Party Wall etc. Act 1996.
Express Party Wall helps adjoining owners across London understand their rights when a neighbour is building an extension, carrying out structural alterations, excavating close to their property, or working on a shared wall or boundary.
Not every extension automatically requires a Party Wall Notice, but many London extension projects do. The Party Wall Act may apply where the works affect a shared wall, a party structure, a boundary wall, or involve excavation close to your property.
This is especially common in London because many properties are terraced, semi-detached, converted into flats, built close to boundaries, or located in dense residential streets.
If your neighbour’s extension is notifiable under the Party Wall Act, they should serve the correct Party Wall Notice before starting the relevant work. The notice should explain the type of work proposed, the property involved, and the legal section of the Act being used.
Depending on the work, notice periods may differ. Some works require one month’s notice, while others may require two months. If you receive a notice, you should not ignore it. Your response affects how the party wall process continues.
You may be able to consent, dissent and appoint a surveyor, or agree to use one agreed surveyor. If you are unsure which option is right, Express Party Wall can review the notice and explain the next step clearly.
Sometimes adjoining owners only become aware of the issue once builders arrive, digging begins, or structural work starts. If you believe your neighbour should have served a Party Wall Notice but did not, it is best to seek advice quickly.
A party wall surveyor can help assess whether the work appears to fall under the Act and whether a notice should have been served. Acting early is important because once work has progressed, it may become harder to record the original condition of your property or resolve concerns calmly.
Where appropriate, you may also wish to request drawings, foundation details and information about the planned works from your neighbour or their builder.
London properties can be more complex than many other areas because of the building density and the variety of property types. A single extension can affect more than one adjoining owner, especially where properties are flats, maisonettes, converted houses or commercial-residential mixed buildings.
Neighbour extension works in London may involve leaseholders, freeholders, managing agents, landlords and multiple adjoining owners. This makes it important to identify the correct owners and serve notices properly before work begins.
Older walls, shallow foundations, basement levels, narrow access and shared structures can also make extensions more sensitive. A Schedule of Condition may be useful before work starts, especially where excavation, structural works or heavy construction activity is planned.
If you receive a valid Party Wall Notice, you normally have a few possible responses. The right option depends on the type of work, your concerns, and whether you are comfortable with the information provided.
You may consent if you are satisfied with the proposed works and do not need a Party Wall Award. However, consenting does not remove your neighbour’s responsibility for any damage caused by their works.
If you dissent, it does not mean you are objecting to the extension itself. It means the formal party wall process should be followed. A surveyor can then help agree the Party Wall Award.
Both owners may agree to appoint one surveyor to act impartially. This can often be simpler and more cost-effective where both sides are comfortable with the appointment.
A Party Wall Award is a legal document prepared by the appointed surveyor or surveyors. It sets out how the notifiable works should be carried out, what protections are required, and what happens if damage occurs.
The award may include details about working methods, access arrangements, working hours, protective measures, drawings, structural details and the Schedule of Condition. This can help reduce uncertainty and give both owners a clearer process to follow.
Express Party Wall supports adjoining owners and building owners across London, including North London, South London, East London, West London and Central London.
Whether your neighbour is building a small rear extension or carrying out more complex basement or structural works, we can help you understand whether the Party Wall Act applies.
Express Party Wall provides clear advice for London adjoining owners who are concerned about neighbouring building works. We can review the notice, check whether the correct process has been followed, explain your options and assist with surveyor appointments where needed.
If your neighbour is building an extension in London and you are unsure whether the Party Wall Act applies, it is better to ask for advice early. Waiting until work is already underway can make the situation more difficult to manage.
Contact Express Party Wall today for practical guidance on neighbour extensions, Party Wall Notices, adjoining owner rights and party wall surveyor appointments across London.
