Party Wall Agreement Process: Timeline, Notices and What to Expect

Party wall • Extensions • Homeowner guidance

Planning a loft conversion, side extension, or any work near a shared boundary? The Party Wall etc. Act 1996 sets out a legal process that you are required to follow before certain types of building work begin.

Understanding the party wall agreement process from the outset can help you plan your project timeline more accurately and avoid delays. This guide explains what is involved, when you need to serve a notice, and what happens if a neighbour agrees or disputes the work.

When Does the Party Wall Act Apply?

The Party Wall etc. Act 1996 applies in England and Wales. It is designed to protect the rights of both the building owner carrying out work and the adjoining owners whose properties may be affected.

You are likely to need to follow the party wall process if your proposed works include any of the following:

• Building a new wall on or at the boundary of your property
• Work directly on a shared wall — such as removing a chimney breast that is part of a party wall
• Excavating within three or six metres of an adjoining building’s foundations, depending on the depth of the proposed excavation
• Loft conversions where structural work is done to the party wall
• Rear and side extensions that involve work close to or on the shared wall

The Act applies to work carried out on shared walls between terraced or semi-detached properties, and to boundary work between detached properties where excavation is involved. If you are unsure whether your project falls within the scope of the Act, a party wall surveyor can advise.

Serving the Party Wall Notice

The first step in the party wall process is serving a written notice on all adjoining owners affected by the proposed works. The notice must be given before work begins — typically at least two months in advance for party wall and party structure work, or at least one month for new walls at or on the boundary line.

The notice must set out:

• Your name and address as the building owner
• The address of the property where the work will be carried out
• A description of the proposed works
• The date on which you intend to start

The notice should be served in writing and kept safely, as it forms part of the legal record. Notices can be delivered in person, by post, or left at the adjoining owner’s property. If the adjoining property is tenanted or vacant, the notice must still be served on the correct legal owner.

Who counts as an adjoining owner?

An adjoining owner is any person with an interest in the adjoining land or building who would be affected by the work. This includes freeholders, leaseholders with a lease of more than one year, and in some cases tenants. If you are unsure who to serve the notice on, a party wall surveyor can help you identify the correct parties.

What Happens After the Notice Is Served

Once a party wall notice has been served, the adjoining owner has 14 days to respond.

If they consent in writing

If the adjoining owner gives written consent within 14 days, the work may proceed without the need for a formal party wall award. Consent should be given in writing and retained by both parties. It is sometimes worth agreeing a schedule of condition of the adjoining property before works begin, even where consent is given — this documents the pre-work condition and can help avoid disputes about damage later.

If they dissent or do not respond

If the adjoining owner dissents or fails to respond within 14 days, a dispute is deemed to have arisen under the Act. At this point, both parties must appoint surveyors to act on their behalf.

The two appointed surveyors may then agree to use an agreed surveyor — a single party wall surveyor who acts impartially for both parties — which can simplify and speed up the process. Alternatively, each party appoints their own surveyor, and those two surveyors appoint a third surveyor in case of disagreement.

The Party Wall Award

Once surveyors are appointed, they will draw up a party wall award. This is a legal document that sets out:

• The nature and extent of the works permitted
• How and when the work may be carried out
• Access rights for the building owner and their contractors
• A schedule of condition of the adjoining property before works begin
• Arrangements for any compensation or remediation should damage occur

The award is binding on both parties and provides a clear framework for how the work should proceed. Once an award is in place, work may generally begin subject to any conditions it contains.

Costs of the party wall process

In most cases, the building owner — the person carrying out the work — meets the cost of the party wall process, including the fees of both surveyors where applicable. This is because the work originates with them and the process exists to protect the adjoining owner. Party wall surveyor fees vary and will depend on the complexity of the project and the amount of work involved.

Typical Timeline

The party wall process takes time, and it is important to factor this into your project schedule before you begin.

In straightforward cases where an agreed surveyor acts for both parties, the process from notice to award may take around six to eight weeks. More complex projects, or situations where there is active dispute, may take longer.

Starting the process early — before your architect finalises drawings or your contractor is booked — reduces the risk of delays to your build programme.