Party Wall Surveyor Knightsbridge

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Knightsbridge crosses a planning-authority boundary

A Knightsbridge address may be in the City of Westminster or the Royal Borough of Kensington and Chelsea. That is not a minor labelling issue: the two authorities have different local plans, basement policies, Article 4 directions and conservation documents.

Westminster’s planning-policy page records that the Knightsbridge Neighbourhood Plan was adopted on 11 December 2018. The council’s neighbourhood-plan page describes it as part of the statutory development plan for its area in Westminster. It should not be applied to an RBKC address simply because both use the Knightsbridge locality name.

Resolve the authority and conservation designation from the complete address before selecting planning guidance. Use the Westminster Party Wall guide for the City side and the Kensington and Chelsea Party Wall guide for the Royal Borough side. The authority determines the planning context, not whether the Party Wall Act applies.

Westminster has three separate Knightsbridge-area designations

Westminster’s current conservation-document index publishes individual maps for Knightsbridge, Knightsbridge Green and Albert Gate conservation areas. Combined audit and supplementary-planning material covers the three, but the maps remain separate. “In Knightsbridge” is therefore not a complete conservation-area answer even on the Westminster side.

The council also gives an important currency warning: adopted older audits and guides can cite policies that predate the current framework and should be read alongside current adopted policy. A design standard quoted from the older combined document should be checked against the City Plan adopted on 21 January 2026.

On the RBKC side, Hans Town creates another status distinction. The council’s directory retains the Hans Town Conservation Area Proposal Statement while labelling the replacement Hans Town Conservation Area Appraisal draft. Do not cite the draft appraisal as though it has replaced the current proposal statement.

Basement policy depends on which side of the seam

Westminster’s current Policy 50 normally limits a basement to one storey and controls the proportion of garden beneath which it may extend. Paragraph 50.2 calls for a structural methodology statement and appropriate self-certification from a suitably qualified engineer with a basement application.

The policy also addresses vaults beneath an adjacent highway: no more than 1.8 metres of encroachment and at least 900 millimetres of vertical cover between the highway surface and vault structure. Those figures regulate planning and highway space. They are not substitutes for the excavation distance and foundation tests in section 6 of the Party Wall Act.

Westminster’s city-wide basement Article 4 direction came into force on 31 July 2016 and removes the specified householder permitted-development right. It means the relevant basement development requires planning permission; it does not create a prohibition.

RBKC adopted its Local Plan 2024 on 24 July 2024. Policy CD11 normally limits a basement to one storey and no more than 50 per cent of each garden or open part of the site, calls for one metre of soil over a garden basement and does not permit excavation underneath a listed building, including vaults. The garden and single-storey criteria contain large-site exceptions.

RBKC’s separate borough-wide basement Article 4 direction was made on 15 April 2015, confirmed on 2 March 2016 and came into force on 28 April 2016. A notice or planning statement quoting the other authority’s direction date or policy number should be corrected before it is relied on.

Planning documents do not replace Party Wall notice

A planning structural methodology statement, engineer’s certification or conservation assessment may help explain a proposed scheme. None of those documents is a Party Wall notice. Planning permission also does not decide whether the proposed operations fall within sections 1, 2 or 6.

The statutory routes must be kept separate:

Section 1 applies where differently owned adjoining lands meet and the line is unbuilt or occupied only by a boundary wall that is neither a party fence wall nor an external building wall. Where an owner is about to build on that line, notice is required at least one month before the intended building work. Without consent to build astride it, the statutory alternative is a wall wholly on the building owner’s land and at that owner’s expense.
Section 2 gives specified rights in relation to party structures. Section 3 normally requires two months’ notice of those works.
Section 6 concerns specified excavation and normally requires one month’s notice.

Under section 6(1), work is not notifiable just because it is within three metres. Some part of the proposed excavation, building or structure within those three metres must also extend below the bottom of the adjoining building or structure’s foundations.

Section 6(2) applies a different test within six metres: any part of the proposed excavation, building or structure must meet a plane drawn downwards, in the direction of the building owner’s excavation, building or structure, at forty-five degrees to the horizontal. It starts from the line where the horizontal plane at the bottom of the adjoining foundations intersects the plane of the external face of the adjoining external wall.

The section 6 notice must be accompanied by plans and sections showing the excavation’s site and depth and, if a building or structure is proposed, its site. An assumed construction period, terrace type or basement policy cannot establish the neighbouring foundation level.

For a section 3 party-structure notice, section 5 deems a dispute after fourteen days without written consent. Section 6(7) provides the corresponding deemed-dispute route for excavation notice. Section 1 has separate response provisions, so it is inaccurate to publish one fourteen-day rule for every notice. The party wall notice guide explains the routes separately.

Where a dispute arises or is deemed to arise, section 10 allows the owners to use one agreed surveyor or each appoint a surveyor. A party to the matter cannot act as the statutory surveyor. A schedule of condition is commonly useful, but the Act does not make it a separate prerequisite for every appointment.

Describe the exact Knightsbridge instruction

Provide:

the complete address and confirmed planning authority;
the named conservation area and any listed-building entry;
whether the property is a house, purpose-built flat, converted flat or mixed-use premises;
known freeholder and qualifying leasehold interests;
the wall, floor, ceiling, vault or other structure affected;
the boundary and position of any proposed wall;
excavation plans and sections, including depths, distances and known foundation evidence;
the structural methodology statement or construction method information, if available;
notices, plans, responses and delivery evidence already exchanged; and
intended works dates and known access constraints.

The Party Wall surveyor guide explains the appointment route, and the Party Wall surveyor London guide gives the wider regional context.

FindTheSurveyor operates a neutral marketplace and does not carry out the surveying work. If a quote is presented, compare the proposed appointing owner, statutory scope, inspections and documents, exclusions, VAT treatment and the basis for any additional work. If the administrator makes a confirmed introduction, the professional appointment and payment terms are agreed directly with the selected surveyor.

Sources checked

The linked Westminster and RBKC policy and conservation indexes, each council’s basement material, and the Party Wall etc. Act 1996 were checked on 24 August 2026. Planning status, mapped boundaries and designations can change, so verify the complete address against current official records.