Party Wall Agreements in London — A Practical Guide for Homeowners

The Party Wall etc. Act 1996 is a piece of UK legislation that provides a framework for preventing and resolving disputes in relation to party walls, boundary walls, and excavations near neighbouring buildings.

The Act applies when you intend to:

• **Section 2 — Party wall works** (the most common trigger for extensions and loft conversions):
• •Any works to a shared party wall (the wall between two terraced or semi-detached houses)
• •Cutting into the party wall (to insert beams, chase cables, or form new openings)
• •Raising the height of the party wall
• •Demolishing and rebuilding the party wall
• •Underpinning the party wall
• •Weathering a party wall

• **Section 3 — New wall on the boundary**:
• •Building a new wall on or astride the boundary line with the adjoining property

• **Section 6 — Excavations near neighbouring foundations**:
• •Excavating within 3 metres of a neighbouring building where the excavation goes deeper than the neighbouring foundations
• •Excavating within 6 metres of a neighbouring building where the excavation intersects with a 45-degree line drawn downwards from the base of the neighbouring foundations

For most London terraced house extensions and loft conversions, both Section 2 and Section 6 will apply — Section 2 for works to the party wall itself, and Section 6 for the foundation excavations which are typically within 3 metres of the neighbouring house.

A Party Wall Notice is a written notice served on the 'adjoining owner' (your neighbour) informing them of your intended works. It is a legal requirement — you cannot start notifiable party wall works without serving notice.

**Who is the 'adjoining owner'?** The owner of the adjoining property — the freeholder, or the leaseholder if they hold a lease of more than 1 year. If the property is rented, you notify the freeholder, not the tenant.

• **When to serve notice:**
• •**Section 2 works (party wall works)**: minimum **2 months** before works commence
• •**Section 6 works (excavations)**: minimum **1 month** before works commence
• •Where both apply, serve both notices at the same time, with the 2-month Section 2 notice timing controlling

**Key rule**: Serve notice as soon as your design drawings are ready — not when you are ready to start on site. The 2-month notice period is a minimum; there is no maximum. The most common programme delay on London extension projects is a late party wall notice causing a dispute resolution process that adds 2–3 months.

• **What information must the notice contain?**
• •Your name and address
• •The address of the building
• •A description of the proposed works with drawings or plans where required
• •The date on which the works are proposed to start

Once you serve notice, your neighbour has three possible responses:

**1. Consent in writing (within 14 days)** If your neighbour consents in writing within 14 days of receiving the notice, a Party Wall Award (formal agreement) is not required. You can proceed with the works once the notice period has expired. Keep a copy of the written consent.

**2. Counter-notice (where they want to add works)** Your neighbour has 1 month to serve a counter-notice requesting that you carry out additional works at the same time (for example, raising the party wall to their own requirements). This is uncommon in practice.

**3. Deemed dissent (no response) or explicit dissent** If your neighbour does not respond within 14 days, or explicitly dissents (objects or says they don't agree), a dispute is deemed to have arisen. This triggers the dispute resolution procedure:

• •Each party appoints a party wall surveyor (or agrees to use a single 'agreed surveyor')
• •The surveyors agree a Party Wall Award — a formal document recording the works to be carried out, the method and timing, and protecting both parties' interests
• •The Award process typically takes 6–10 weeks once surveyors are appointed
• •The building owner (you) typically pays the costs of both surveyors

**Costs of the dispute resolution process**: an agreed surveyor typically charges £800–£1,500. If separate surveyors are appointed, you will pay for both — total cost £1,500–£3,000 is common. In contentious cases, costs can be higher.

• A Party Wall Award is a legally binding agreement that:
• •Describes the proposed works in detail
• •Sets out the method and sequence of works
• •Records the condition of the adjoining property before works begin (via a Schedule of Condition)
• •Defines how access to the adjoining property is to be managed
• •Sets out arrangements for making good any damage
• •Confirms how disputes during the works are to be resolved

The Schedule of Condition is particularly important. It is a photographic record of the condition of the adjoining property (typically the wall, floors, and ceiling of the rooms adjacent to the party wall) before works begin. It protects you: if the neighbour claims the works caused damage that was already there, the Schedule provides evidence of the pre-existing condition.

Once the Award is issued, you can proceed with the works. The Award remains in force for the duration of the works.

No. The Party Wall Act is not a consent mechanism — your neighbour cannot veto your extension through the party wall process. They can only trigger the dispute resolution procedure, which results in an Award that allows you to proceed with the works (subject to conditions).

This is a crucial point that many homeowners do not understand. A neighbour who objects to your extension through the planning process has the ability to raise objections that the council may consider. A neighbour who dissents under the Party Wall Act only triggers the surveyor process — they cannot prevent you from doing works that are otherwise legal.

However, if you carry out party wall works without serving notice, and those works cause damage to the adjoining property, you have no legal protection under the Act. The neighbour can claim damages, and you will have no Schedule of Condition to rely on as evidence of the pre-existing condition.

You do not need to appoint a party wall surveyor unless a dispute arises (i.e., your neighbour dissents or doesn't respond). If your neighbour consents in writing, no surveyor is needed.

If a dispute arises, the Act requires surveyor involvement. You can:

**Option 1: Agreed Surveyor (single surveyor for both parties)** Both parties agree to appoint one surveyor to act for both. This is faster and cheaper. The agreed surveyor must be impartial. RCB recommends this option where the relationship with the neighbour is good — it typically takes 4–6 weeks to reach an Award.

**Option 2: Two surveyors (one per party)** Each party appoints their own surveyor. The two surveyors prepare the Award jointly (and appoint a third surveyor as umpire if they cannot agree). This takes longer (6–10 weeks) and is more expensive. Typically used when there is a dispute about the scope of works or the potential for damage.

**Practical guidance**: RCB assists clients in serving party wall notices and can recommend experienced party wall surveyors. Many of our clients achieve consent without needing to involve surveyors — particularly where we help frame the initial notice clearly and address neighbour concerns early.