Serving Party Wall Notices in London: A Step-by-Step Guide

There are three types of notice under the Party Wall etc. Act 1996, each triggered by different types of work: Party Structure Notice (Section 3): required when you intend to carry out works to a party wall or party floor — a wall or floor shared with an adjoining property. Works covered include: cutting into the party wall (to insert beams, flashings, or services); raising the party wall; demolishing and rebuilding the party wall; and underpinning the party wall. Timescale: must be served at least 2 months before works start. Line of Junction Notice (Section 1): required when you intend to build up to or on the boundary line between properties, where no party wall currently exists. Applies to: new walls built on or astride the boundary; building up to within 3m of the boundary at foundation level. Timescale: must be served at least 1 month before works start. Three Metre Notice and Six Metre Notice (Section 6): required when you intend to excavate within 3m of the neighbouring property's structure to a depth lower than its foundations (Three Metre Notice), or within 6m where the line of your excavation intersects a 45-degree plane drawn downward from the bottom of the neighbour's foundation (Six Metre Notice). Applies to most extension foundations in London, as houses are close together and the new extension's foundation is typically within 3m of the neighbouring property. Timescale: must be served at least 1 month before works start.

Each Party Wall Notice must be in writing and must include: Your full name and address (the building owner serving the notice). The address of the property where works are to be carried out. The name and address of the adjoining owner (your neighbour) to whom the notice is served. A description of the proposed works: what you intend to do, in enough detail for the adjoining owner to understand the nature and scope of the works. Relevant drawings or plans showing the works (these should at minimum show the plan and section of the proposed works in relation to the party wall or boundary). The anticipated start date of the works (not less than the statutory notice period from the date of service). For Section 6 notices: details of the proposed excavation — depth, distance from the neighbour's structure. Signature and date. There is no prescribed form for Party Wall Notices — any written document containing the above information is valid. However, using a standard template (available free from the government's planning portal or the Pyramus and Thisbe Club) reduces the risk of an invalid notice.

A Party Wall Notice can be served: In person (hand delivered to the adjoining owner): reliable if the neighbour is in the property. Obtain an acknowledgement of receipt if possible. By recorded delivery: the most common method. Keep the certificate of posting and the Royal Mail signature receipt as evidence of service. By email: valid if the adjoining owner has previously indicated in writing that they are willing to receive notices by email. Ordinary post (first class): valid but harder to evidence service if the neighbour disputes it. Notice to a tenant versus a freeholder: the notice must be served on the owner of the adjoining property (the freeholder or long leaseholder), not just the current occupying tenant. If the adjoining property is a leasehold flat, the notice may need to be served on both the freeholder and the leaseholder depending on the nature of the works and the lease terms. In a terrace of houses, the Two Parties are typically just you and your immediate neighbours on either side. In a London terrace where the rear outrigger shares a wall with the house behind as well, a third or fourth neighbour may also be an adjoining owner requiring notice.

After a Party Wall Notice is served, the adjoining owner has 14 days to respond in one of three ways: Consent: the adjoining owner signs and returns a written consent to the works. The works can proceed after the notice period has expired, with no party wall surveyor required. This is the ideal outcome and occurs in a significant proportion of straightforward residential projects where the neighbours are on good terms. Dispute (dissent): the adjoining owner disputes the works or does not respond within 14 days. In this case, a dispute is deemed to exist under Section 10 of the Act, and each party must appoint a surveyor to agree an Award. Counter-notice: in response to a Section 3 notice, the adjoining owner may serve a counter-notice requesting modifications to the proposed works. If the two owners cannot agree on the counter-notice terms, the dispute procedure applies. The dispute procedure: once a dispute exists, the building owner and the adjoining owner each appoint a party wall surveyor. The two surveyors may jointly appoint a third surveyor to act as arbitrator. The surveyors' role is to agree a Party Wall Award — a document that sets out the scope of the works, any conditions on how they are to be carried out, the condition of the adjoining property before works (schedule of condition), and any compensation for damage caused.

Party wall surveyor fees in London vary depending on the complexity of the works and the number of adjoining owners involved: Simple consent (where the neighbour consents and no Award is required): building owner cost typically nil or very low (if using a solicitor to draft the consent form). Straightforward dispute with one adjoining owner, simple Award: building owner's surveyor fee £800-£1,500; adjoining owner's surveyor fee £800-£2,000 (the building owner typically pays both surveyors' fees). Multi-neighbour dispute, complex works (loft conversion, basement, wrap-around extension): total surveyor fees £3,000-£8,000. Schedule of condition (survey of the adjoining property before works to document its pre-works state, protecting both parties from disputes about damage): £300-£700 per property surveyed. In London, where disputes are more common and works more complex, budgeting £2,000-£5,000 for party wall matters on a medium-complexity project (rear extension and loft conversion) is prudent. The key financial protection is the schedule of condition — without it, a neighbour can claim that any pre-existing crack or mark was caused by your works.