Party Wall Surveyor Twickenham

Twickenham addresses are normally handled by the London Borough of Richmond upon Thames, but the locality and TW postcode districts reach towards other authority areas. Confirm the complete address against the current planning-authority map before applying Richmond policy. That check also prevents East Twickenham, Whitton or a marketing description from being used as an unsupported boundary conclusion.

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Use the adopted 2025 plan, not the old Twickenham AAP

Richmond’s Adopted Local Plan page says the Local Plan 2024-2039 was adopted on 7 October 2025. It replaced the previously adopted 2018 Local Plan and the Twickenham Area Action Plan 2013. An online result quoting the AAP can still describe historic context, but it is not the current development-plan policy for a new application.

The page for Party Wall surveyors for Richmond properties explains the authority-wide position. The Party Wall surveyor London guide provides the wider statutory route. The Twickenham request should still record the complete address, planning authority and current adopted plan version.

Planning policy and the Party Wall Act answer different questions. A scheme can need planning permission without engaging the Act, engage the Act without needing a full planning application, or require both routes. Neither approval substitutes for the other.

Current supplementary guidance keeps three distinct rear projections

Richmond’s updated supplementary-guidance directory continues to list the House Extensions and External Alterations SPD, adopted on 1 June 2015. The document still refers internally to plans that have since been superseded, so use its design guidance with the October 2025 Local Plan rather than importing the old policy framework.

For a single-storey rear extension, the SPD says the effect is usually acceptable where the projection is no further than:

3 metres for a terraced property;
3.5 metres for a semi-detached house; and
4 metres for a detached house.

Those figures are not absolute permissions. Paragraph 3.1.3 makes the final test site-specific, including distance from the boundary and neighbouring property, height next to the boundary, materials and neighbouring layout. Where a Victorian infill extension exceeds the stated depth, the guidance says the eaves height should be limited to 2.2 metres to mitigate enclosure.

For side work, the SPD says a subordinate extension is usually set back at least one metre behind the front elevation. It also says a two-storey side extension should be sited one metre from the side boundary to retain an important gap and avoid a terracing effect, and should not be wider than half the original building.

These planning figures do not create a statutory right to build on the junction or cut into a shared wall. The page for Party Wall surveyors across West London can organise a wider search, but the title plan, wall construction and proposed drawings govern the particular job.

Policy 54 and the basement directions operate together

The adopted plan’s Policy 54, Basements and Subterranean Developments resists more than one storey below existing ground level at a residential property or one previously in residential use. Its other requirements include:

no more than 50% of existing garden land, or half of another undeveloped garden area, excluding the original-building footprint;
structural stability for the host, neighbours and infrastructure, with a Structural Impact Assessment for work added to or adjacent to a listed building;
at least one metre of naturally draining permeable soil and a 200mm drainage layer over basement beneath garden;
a site-specific screening assessment by a chartered professional in the specified throughflow or groundwater policy zones and areas with at least 25% groundwater-flood susceptibility;
a Basement Impact Assessment where screening identifies potential effects or further investigation is needed;
a suitable positive pumping device where the proposal contains a waste outlet; and
a Construction Management Plan addressing construction and occupation impacts.

Richmond uses two basement Article 4 directions, one for the greatest flood-hazard land and one for the remaining mapped area. Together they cover the borough, and the council says the specified basement development has required planning permission since 1 April 2018.

The council’s basement webpage usefully identifies planning, building-control and construction documents, but its short Party Wall description reduces the issue to work within three or six metres. That is incomplete. Distance alone does not engage section 6: the three-metre route also requires excavation below the adjoining foundation bottom, and the six-metre route uses the statutory plane.

Heritage directions can stop at a run of addresses

Twickenham includes several conservation areas. The Twickenham Riverside appraisal extends from Marble Hill Park to Radnor Gardens and includes Eel Pie Island. The Twickenham Green appraisal covers a different area centred on the triangular Green. Check the address against the current map and use the matching appraisal.

Twickenham Green also shows why “in an Article 4 area” is too vague. Its current appraisal records a direction made on 26 October 1992 for 24-33 First Cross Road. The listed controls concern specified exterior alterations, hard surfaces, antennae, enclosures and exterior painting. That direction does not apply to every property around the Green and is separate from the borough basement directions.

Conservation and Article 4 status can affect whether planning permission is needed for visible alterations, lightwells, railings, roofs, windows or boundary treatment. It cannot turn a non-party wall into a party structure or alter the notice periods in the 1996 Act.

Preserve every element of the statutory tests

The Party Wall surveyor guide explains the process. For a Twickenham project, record the gateway as well as the proposed work:

Section 1(1): the lands adjoin and are owned by different owners. At the line of junction, no building stands or there is only a boundary wall that is neither a party fence wall nor an external building wall. If an owner is about to build on any part of that line, at least one month’s notice is required. Without consent to place a wall astride the line, the statutory alternative is a wall wholly on the building owner’s land and at that owner’s expense.
Sections 2 and 3: before exercising a section 2 right, the building owner ordinarily serves a notice at least two months before the intended start, stating the owner’s name and address, the nature and particulars of the work and the proposed start date. Section 3(3) excepts work with the written consent of every adjoining owner and occupier and work required by a statutory dangerous-or-neglected-structure notice.
Section 6(1): the proposal is to excavate, or to excavate for and erect a building or structure, within three metres horizontally of part of an adjoining building or structure, and part of the proposed excavation, building or structure inside those three metres extends below the level of the bottom of the adjoining foundations.
Section 6(2): within six metres, ask if any part of the proposed excavation, building or structure would meet a plane drawn downwards in the direction of the building owner’s excavation, building or structure at 45 degrees to the horizontal. Its origin is the line where a horizontal plane at the adjoining foundation-bottom level intersects the plane of the external face of the adjoining building’s or structure’s external wall.

Where section 6 applies, notice is served at least one month before excavation and includes the required plans and sections. The party wall notice guide covers the distinct notice types and response routes. Richmond’s planning 25- and 45-degree daylight checks, its basement screening zones and the Act’s section 6 plane must remain separately labelled.

Give the reviewer a measurable Twickenham file

Include:

the full address and verified local planning authority;
the October 2025 Local Plan reference and applicable current SPD pages;
the exact conservation-area and address-level Article 4 results;
rear or side extension dimensions and retained boundary gaps;
existing and proposed plans identifying ownership lines and shared structures;
excavation sections with horizontal distances, formation levels and known adjoining-foundation bottoms;
basement screening, BIA, structural and construction-management material where relevant;
existing notices, drawings, service evidence and responses; and
freehold and leasehold information for the interests potentially affected.

If adjoining-foundation information is absent, describe it as unknown. Do not turn a council shorthand or a postcode into a statutory conclusion. If an introduction is made, assess the stated scope, inspections, deliverables, exclusions and responsibility for later stages before appointment. Post your Twickenham Party Wall job.

Sources checked

The authority, adopted-plan, extension, basement, conservation and Article 4 statements were checked against the linked Richmond sources on 24 August 2026. The statutory wording was checked against section 1, section 2, section 3 and section 6 of the Party Wall etc. Act 1996. Recheck the exact address, heritage designations and current planning documents when the work is prepared.