Party Wall Surveyor Chiswick

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The adopted plan is from 2015, not the plan still at examination

Hounslow’s Local Plan page states that the current plan was adopted on 15 September 2015 and sets the borough planning framework to 2030.

A replacement is progressing, but it is not yet the adopted plan. The council’s examination news records submission of the proposed Hounslow Local Plan 2020 to 2041 on 23 June 2025. It was still publishing actions requested by the inspectors on 16 July 2026 following the fifth week of hearings. A design statement should distinguish adopted policy from a submitted or suggested modification rather than presenting them as interchangeable.

The separate Character, Sustainability and Design Codes SPD was adopted on 14 May 2024. Part A5 contains the residential extension rules, while Part B10 is the neighbourhood-level Chiswick code. Those documents are current planning guidance even while the replacement Local Plan is examined.

Hounslow publishes exact rear-extension measurements

Paragraph A5.10 of the adopted Part A5 measures a first extension from the original main rear wall and includes any roof overhang. Its stated maximum depths are:

These are planning-design measurements, not Party Wall notice distances. They address enclosure, daylight, sunlight and the relationship with the original house. They do not decide whether a proposed excavation is deeper than the adjoining foundations.

The same guidance treats an older L-shaped house with an outrigger separately. Where an infill extends beyond the usual depth, it says the eaves on the shared-boundary side should not exceed two metres and the roof pitch should not exceed forty-five degrees, sloping away from the boundary. Again, that planning angle is not the forty-five-degree plane used by section 6 of the Act; the two tests start from different points and answer different questions.

The basement limits are unusually specific

Part A5 gives a Chiswick homeowner or neighbour a concrete planning checklist. Paragraphs A5.55 to A5.57 state that a basement should:

• be no deeper than one subterranean floor;
• remain behind the main front and side walls of the house;
• for a larger property, project rearwards beneath part of the garden only up to 3.05, 3.65 or 4.25 metres according to the house type; and
• reinstate at least one metre of soil over the garden portion for drainage and planting.

Paragraph A5.53 says that where the council allows a basement, a planning condition will require submission of a construction method statement certified by a suitably qualified engineer. It is to cover excavation, temporary works and construction techniques, assess potential effects on neighbouring land using the area’s geology and hydrology, and address noise, dust and vibration. That wording does not say that every application must include the final statement or that the certifying engineer must also be its author.

That document can be valuable to an adjoining owner, but it does not replace the statutory information required by a section 6 notice. The notice must be accompanied by plans and sections showing the site and depth of the proposed excavation and, where relevant, the proposed building or structure.

Chiswick is a collection of distinct heritage areas

Hounslow’s conservation-area appraisal index publishes separate material for Bedford Park, Chiswick High Road, Chiswick House, Glebe Estate, Grove Park, Old Chiswick, Stamford Brook, Strand on the Green, Turnham Green and Wellesley Road. Ealing also publishes Bedford Park material. “Chiswick” therefore does not by itself establish Hounslow jurisdiction: the Hounslow Local Plan and SPD statements on this page apply only where the address is within that authority, and a reference simply to “the Chiswick conservation area” is too imprecise.

The council’s Article 4 page identifies additional controls for Bedford Park and Gunnersbury conservation areas. It provides separate schedules of affected properties and describes controls aimed at specified alterations. The schedule and property address need checking; neither direction should be treated as a blanket rule for every Chiswick home.

Conservation controls and Article 4 directions concern planning permission. A Party Wall surveyor does not grant planning permission, and a planning approval does not authorise the building owner to skip a notice required by the Act.

Apply the Act’s tests to the proposed work

For a Chiswick rear extension, loft alteration or basement, the relevant statutory route depends on what is actually proposed:

• A wall on the line of junction may engage section 1.
• Cutting a beam bearing into a party structure may engage sections 2 and 3.
• Excavation may engage section 6 even if the extension is wholly inside the building owner’s boundary.

The shorthand “within three metres” is incomplete. Section 6(1) also requires the proposed excavation to go below the bottom of the adjoining owner’s foundations. Section 6(2) reaches out to six metres only where part of the excavation would meet the plane drawn downwards towards that excavation at forty-five degrees to the horizontal from the level of the bottom of the adjoining foundations at the external face of the building or structure.

The planning code’s 3.05, 3.65 and 4.25 metre extension depths therefore cannot be used as a proxy for Party Wall notice. One measures the projection of development from the original rear wall. The other compares an excavation with an adjoining building and its foundations.

Nor does notifiable work always require an award. For a party-structure notice under section 3 or an excavation notice under section 6, written consent avoids the statutory dispute route; dissent or the applicable fourteen-day period without consent engages section 10. Section 1 has separate response provisions. The party wall notice guide explains the different notices, response routes and lead times.

Give a surveyor the material needed to define the job

Before asking for a Chiswick quote, assemble what is available:

• the complete address and the current conservation-area or Article 4 map and schedule;
• existing and proposed plans, including the original rear wall;
• foundation and excavation sections with levels and dimensions;
• the basement construction method statement and structural information;
• the notice served or received, its drawings and its date; and
• any written consent, dissent or unanswered delivery evidence.

The Party Wall surveyor guide explains the surveyor’s statutory role. The Party Wall surveyor cost guide covers what to compare in proposed scope and fees. For council-wide policy use the page for Party Wall surveyors for Hounslow properties; across the Hounslow–Ealing authority boundary, the page for Party Wall surveyors for Acton properties explains Ealing’s different planning position.

FindTheSurveyor operates a marketplace and does not perform the surveying work. If a quote is presented, compare the appointment basis, included inspections and documents, exclusions, VAT treatment and provision for additional work before deciding whether to request an introduction.

Sources checked

The local planning statements above were checked against the linked Hounslow Council pages and the adopted Part A5 PDF on 24 August 2026. The statutory tests were checked against the Party Wall etc. Act 1996. Planning policy, examination status and mapped designations can change, so verify the address and proposal against current official material.