A London postcode or borough does not by itself create a Party Wall obligation. Notice is conditional on the proposed work engaging the Act and on the notice being prepared and served correctly. Check the actual drawings, measurements, ownership details and proposed start date rather than relying on a project label.
Which sections of the Act matter here?
The three common notice routes are the same in every part of England and Wales:
- Section 1 — line of junction: building a new wall on the line of junction or proposing a wall astride the boundary. One month's notice is normally required. Written consent from the adjoining owner is needed for the wall to be built astride the boundary; silence does not authorise that option.
- Section 3 — party structure: exercising the relevant rights to cut into, raise, lower, rebuild or otherwise work on a party wall or party structure. Two months' notice is normally required.
- Section 6 — adjacent excavation: excavating within 3 metres of a neighbouring building where the excavation will go below the level of its foundations, or within 6 metres where the excavation intersects the relevant 45-degree plane from the adjoining building's foundations. One month's notice is normally required, with drawings showing depth and proximity.
For a Section 3 or Section 6 notice, an express dissent or no written consent within 14 days can give rise to a deemed dispute under the statutory process. That 14-day deemed-dispute rule does not apply to a Section 1 proposal for a wall astride the boundary: written consent is needed for that option.
Practical London project examples
Loft conversions
A loft conversion may require a Section 3 notice where steel beams, joist hangers, flashings or other work engages the party wall, or where the wall is raised. A Velux-only conversion with no work to the party structure may not be notifiable under the Act. Check the structural drawings rather than relying on the project label.
Rear extensions
A rear extension may raise a Section 6 question because of its foundations, but the statutory distance and depth tests still have to be met. Section 1 may apply to a new wall built on the line of junction, while Section 3 is relevant if the proposal works on a shared wall or party structure. These are separate statutory questions; one extension does not automatically require every type of notice.
Side-return extensions
A side return may involve excavation beside a neighbour's building and a new wall at the boundary. The depth, distance and foundation design determine whether Section 6 and/or Section 1 applies. If the existing party wall is cut into, raised or otherwise used structurally, Section 3 may also be relevant.
Basements and lower-ground works
Basement excavation may fall within Section 6 and may also involve Section 3 where the party wall is underpinned, lowered or otherwise affected. These works need properly prepared drawings and often merit early independent structural and party wall advice. A checker result cannot assess engineering risk or replace that advice.
Chimney breast removal
Removing a chimney breast that forms part of a shared wall will generally engage Section 3. The proposed support and the extent of removal should be accurately described. If the chimney is genuinely entirely on one owner's side and does not affect the party structure, the position may be different.
The 32 London boroughs and the City of London
The Party Wall Act applies in all of these boroughs and in the City of London; the local authority does not change the statutory test:
- Barking and Dagenham
- Barnet
- Bexley
- Brent
- Bromley
- Camden
- Croydon
- Ealing
- Enfield
- Greenwich
- Hackney
- Hammersmith and Fulham
- Haringey
- Harrow
- Havering
- Hillingdon
- Hounslow
- Islington
- Kensington and Chelsea
- Kingston upon Thames
- Lambeth
- Lewisham
- Merton
- Newham
- Redbridge
- Richmond upon Thames
- Southwark
- Sutton
- Tower Hamlets
- Waltham Forest
- Wandsworth
- Westminster
- City of London
Correct details and service still matter
A Party Wall notice must be based on correct information about the building owner, adjoining owners, property, proposed works, drawings and timing. It must also be served correctly on every relevant adjoining owner. Check the service method and keep evidence of service; electronic service should only be used where the recipient has agreed in writing to accept it. A notice generator cannot guarantee that incomplete input or incorrect service creates a valid notice.
Planning permission and building-regulations approval are separate questions. They do not decide whether a Party Wall notice is required, and a Party Wall notice does not provide either approval.
Existing surveyor directory routes for London
If an adjoining owner dissents, or a Section 3 or Section 6 notice receives no written consent within 14 days, a surveyor process may become relevant. That does not mean a surveyor is automatically needed for every project. These existing postcode-area directory links are provided for you to review independently:
- Party wall surveyor directory for East London (E)
- Party wall surveyor directory for City of London (EC)
- Party wall surveyor directory for North London (N)
- Party wall surveyor directory for North-West London (NW)
- Party wall surveyor directory for South-East London (SE)
- Party wall surveyor directory for South-West London (SW)
- Party wall surveyor directory for West London (W)
- Party wall surveyor directory for West Central London (WC)
- Party wall surveyor directory for Bromley and nearby south-east London (BR)
- Party wall surveyor directory for Croydon and nearby south London (CR)
- Party wall surveyor directory for Bexley and nearby south-east London (DA)
- Party wall surveyor directory for Enfield and nearby north London (EN)
- Party wall surveyor directory for Harrow and nearby north-west London (HA)
- Party wall surveyor directory for Redbridge and nearby east London (IG)
- Party wall surveyor directory for Kingston and nearby south-west London (KT)
- Party wall surveyor directory for Havering and nearby east London (RM)
- Party wall surveyor directory for Sutton and nearby south London (SM)
- Party wall surveyor directory for Richmond and nearby south-west London (TW)
- Party wall surveyor directory for Hillingdon and nearby west London (UB)
You can also use the full postcode search. A directory listing is not an appointment or a recommendation for a particular dispute; decide independently whether to contact or instruct anyone.
Start with the free checker
The quickest next step is our free eligibility checker. It helps organise the Section 1, 3 and 6 questions before you decide whether to prepare a notice. If the checker indicates that a notice may be needed, verify your plans and adjoining-owner details before you create a notice. Neither tool is a guarantee that a notice is suitable for every set of facts.
Frequently asked questions
Does London have a different Party Wall law?
No. The Party Wall etc. Act 1996 applies across England and Wales, including all 32 London boroughs and the City of London. The statutory tests and notice periods do not change because a property is in a particular borough.
Does every London extension need a Party Wall notice?
No. It depends on the proposed work: whether it builds at the line of junction, affects a party structure, or excavates close to a neighbouring building at the relevant depth. A rear or side-return extension may raise one or more of these questions, but the plans and foundations decide.
Can I serve a London notice without a surveyor?
Yes. The Act does not require a surveyor to prepare or serve a notice. A surveyor may become involved if an adjoining owner dissents or a Section 3 or Section 6 notice receives no written consent within 14 days, and complex works may justify independent advice before service.