The Complete Guide to Party Wall Agreements

party-wall-agreement-complete-guide

If you are planning building works that affect a shared wall, boundary or neighbouring property, the Party Wall etc. Act 1996 almost certainly applies to you. This guide explains everything you need to know — from when party wall notices are required, through to how awards work and what the process costs.

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. The most common examples are:

The wall between two semi-detached or terraced houses
A garden wall built on the boundary line between two properties
A wall that separates two buildings, such as in converted flats or commercial units

The term also covers party fence walls (boundary walls that are not part of a building), party structures (floors and ceilings between flats) and, in some situations, excavation near neighbouring buildings.

What Is the Party Wall etc. Act 1996?

The Party Wall etc. Act 1996 is an Act of Parliament that provides a framework for preventing and resolving disputes between neighbours in relation to party walls, boundary walls and excavations near neighbouring buildings. It applies throughout England and Wales.

The Act does three things:

Requires building owners to give formal notice before carrying out certain types of work
Provides a mechanism for resolving disputes through appointed surveyors
Protects adjoining owners by ensuring their property is safeguarded during building works

The Act does not prevent you from carrying out your works. It simply ensures that your neighbours are informed, that their property is protected, and that any disputes are resolved fairly.

When Do You Need a Party Wall Notice?

You are required to serve a party wall notice if your building works fall into one of three categories:

Section 1 — New Building on the Boundary Line

If you plan to build a new wall or structure on or astride the boundary line between your property and a neighbouring property, you must serve a Section 1 notice. This commonly applies to rear and side extensions.

Section 2 — Work to an Existing Party Wall

If you plan to carry out work directly to an existing party wall or party structure, you must serve a Section 2 notice. This includes cutting into a party wall to insert a beam, raising or reducing the height of a party wall, demolishing and rebuilding a party wall, and removing chimney breasts from a party wall.

Section 6 — Excavation Near a Neighbouring Building

If you plan to excavate within 3 metres of a neighbouring building and to a depth below its foundations, or within 6 metres where the excavation cuts a line drawn downward at 45 degrees from the bottom of the neighbour's foundations, you must serve a Section 6 notice. This most commonly applies to basement conversions, underpinning and deep foundation work.

The Party Wall Process Step by Step

The party wall process follows a clear sequence:

Serve notice — The building owner serves a written notice on each affected adjoining owner at least one month (Section 1) or two months (Sections 2 and 6) before the proposed start date
Adjoining owner responds — The adjoining owner has 14 days to consent or dissent. If they do not respond, they are deemed to have dissented
If consent is given — The works can proceed. We still recommend a schedule of condition to protect both parties
If dissent is given (or no response) — Each party appoints a surveyor, or both parties appoint an agreed surveyor. The surveyor(s) prepare a party wall award
Party wall award — The award is a legally binding document that sets out the works permitted, the timing, access arrangements and any conditions. It usually includes a schedule of condition recording the state of the adjoining property before works begin
Works proceed — The building owner carries out the works in accordance with the award

What Is a Party Wall Award?

A party wall award is the formal document prepared by the appointed surveyor(s) under the Act. It records:

The works that are permitted and any conditions attached
The rights and responsibilities of both parties
A schedule of condition of the adjoining property
The timing and manner in which the works are to be carried out
Provisions for access and working hours
How costs are to be apportioned

The award is binding on both parties and their successors in title. It can be enforced through the courts if necessary. Either party has the right to appeal an award to the County Court within 14 days of receiving it.

What Is a Schedule of Condition?

A schedule of condition is a detailed, photographic record of the condition of a neighbouring property before building works begin. It provides an objective baseline that can be referred to if any damage is alleged after the works are completed.

We recommend a schedule of condition even where the adjoining owner consents to the notice. It protects both parties and avoids disputes about whether damage was caused by the building works or pre-existed.

How Much Does a Party Wall Surveyor Cost?

Party wall surveyor fees depend on the complexity of the project, the number of adjoining owners affected, and whether the matter is resolved by consent or requires a full award.

As a guide:

Single adjoining owner, straightforward project — £900 to £2,500
Multiple adjoining owners or complex works — £2,500 to £5,000+
Schedule of condition only — £400 to £800

In most cases, the building owner pays the reasonable fees of both their own surveyor and the adjoining owner's surveyor. We provide fixed fee quotes before any work begins, so there are no surprises.

How Long Does the Party Wall Process Take?

The timeline depends on whether the adjoining owner consents:

Consent given — The process can be completed in as little as 2 weeks
Dissent — agreed surveyor appointed — Typically 4 to 6 weeks
Dissent — separate surveyors appointed — Typically 6 to 8 weeks, sometimes longer if the works are complex or the other surveyor is slow to respond

We always recommend starting the party wall process as early as possible — ideally as soon as you have planning permission or detailed drawings. Delays in serving notice can push back your construction start date.

Common Misconceptions

"I don't need a party wall notice for a small extension." — The Act does not distinguish between small and large projects. If the works fall within Section 1, 2 or 6, notice is required regardless of the size of the project.

"My neighbour has agreed verbally, so I don't need a notice." — Verbal agreement is not sufficient under the Act. Formal written notice must be served. This protects both parties if circumstances change or if the property is sold.

"The Act only applies to terraced houses." — The Act applies to any situation where building works affect a party wall, boundary or nearby foundations. This includes detached houses where excavation is near a neighbour's building.

"I can use any surveyor for party wall work." — While the Act does not require specific qualifications, the party wall award is a legally binding document. Instructing an unqualified surveyor risks errors that can lead to disputes, delays and additional costs. We strongly recommend using a chartered surveyor who is a member of RICS.

Why Choose Acton & Co

We are RICS-regulated chartered surveyors with membership of both RICS and CIOB. Our office is based in Gravesend, and we provide party wall services across London, Kent and the South East. We act for building owners, adjoining owners and as agreed surveyors.

We take a pragmatic approach to every instruction. Our goal is to reach agreement efficiently, protect our clients' interests and keep building projects on schedule. We provide fixed fee quotes so you know the cost before we start.

Party Wall Surveyors Near You

We provide party wall surveying services across London and Kent. Find your local page for area-specific information and FAQs:

We also provide building surveying and chartered surveying services across both regions.

Frequently Asked Questions

Can my neighbour refuse a party wall notice?

Your neighbour cannot prevent you from carrying out works that comply with the Act. If they dissent, surveyors are appointed to prepare an award. If they do not respond within 14 days, they are deemed to have dissented, and the surveyor process begins automatically.

What happens if I carry out work without serving a party wall notice?

If you carry out notifiable works without serving notice, the adjoining owner can seek an injunction to stop the works. They can also pursue a claim for damages. Proceeding without notice also means you have no award in place to define permitted works or protect you if a dispute arises.

Does the Party Wall Act apply to garden walls?

If the garden wall is a party fence wall — meaning it stands on the boundary line and is used to separate the properties — then yes, certain works to it will fall under the Act. Building a new wall on the boundary line also requires notice under Section 1.

Who pays for the party wall surveyor?

In most cases, the building owner pays the reasonable fees of both their own surveyor and the adjoining owner's surveyor. The award will confirm how costs are apportioned.

Can I serve my own party wall notice?

You can draft and serve your own notice, but we recommend having a chartered surveyor prepare it to ensure it is correctly worded and served in accordance with the Act. An incorrectly served notice can invalidate the process and cause delays.