Party Wall Agreements Explained

What the Party Wall Act covers, when you need a party wall agreement, how the process works, and what it costs.

The Party Wall etc. Act 1996 provides a framework for resolving disputes between neighbours when building work affects a shared wall, boundary, or nearby structures. Understanding it helps you avoid delays and disputes.

What Is a Party Wall?

A party wall is a wall that stands on the land of two or more owners and forms part of a building. Common examples include:

• The shared wall between semi-detached or terraced houses
• A garden wall built on the boundary line
• A floor or ceiling between flats

When Do You Need a Party Wall Agreement?

You must serve a party wall notice on your neighbours before starting any of the following work:

Work Directly on a Party Wall (Section 2)

• Cutting into the wall to insert a beam or lintel
• Removing a chimney breast from a party wall
• Raising, lowering or demolishing a party wall
• Underpinning a party wall
• Changing the thickness of a party wall

Building on the Boundary Line (Section 1)

• Building a new wall or structure on the boundary line

Excavation Near a Neighbouring Building (Section 6)

• Excavating within 3 metres of a neighbour's building, if your excavation goes below the bottom of their foundations
• Excavating within 6 metres of a neighbour's building, if a 45-degree line drawn from the bottom of their foundations would intersect your excavation

The Process

1. Serve a notice - give your neighbour a written notice at least 2 months before the planned start date (for work on a party wall) or 1 month before (for excavation). The notice must describe the proposed work
2. Neighbour responds - they have 14 days to respond:
   • Consent - they agree, and you can proceed (put the consent in writing)
   • Dissent or no response - a dispute is deemed to have arisen
3. Appoint surveyors - if there is a dispute, each party appoints a surveyor (or both agree to use a single "agreed surveyor")
4. Party wall award - the surveyor(s) prepare a Party Wall Award, which sets out:
   • What work can be done and how
   • A schedule of condition of the neighbour's property (a photographic/written record of the current state)
   • Access arrangements
   • Who pays for what
5. Work proceeds - you carry out the work in accordance with the award

How Much Does It Cost?

• If your neighbour consents: effectively free (just the cost of printing and serving the notice)
• Agreed surveyor (both parties share one surveyor): £800-£1,500
• Two surveyors (one each): £1,500-£3,000+ (you typically pay for both surveyors' fees as the person carrying out the work)

The building owner (the person doing the work) is generally responsible for the costs of the party wall process.

Common Misconceptions

• "My neighbour can stop my work" - they cannot. The Party Wall Act provides a process for the work to proceed, with appropriate protections. They can only influence the conditions, not block the work entirely
• "I only need a party wall agreement for large projects" - even small works like removing a chimney breast from a shared wall require a notice
• "Party wall and planning permission are the same thing" - they are completely separate processes. You may need both, either, or neither

What If I Skip the Process?

Failing to serve a party wall notice is not a criminal offence, but your neighbour can seek an injunction to stop the work. They could also bring a claim for damages if the work causes any harm to their property. It is always better to follow the proper process.

Tips

• Talk to your neighbour before serving the formal notice - explain what you are planning and why
• Serve notices early to avoid delaying your project start date
• If you get consent, confirm it in writing and keep a copy
• Even with consent, a schedule of condition is strongly recommended to protect both parties