Party Wall Surveyor Barking and Dagenham: Compare Quotes

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A 2024 plan, a 2012 guide and a 2026 Becontree code

Barking and Dagenham adopted its Local Plan 2037 on 18 September 2024. The plan replaced the old borough-wide policies to which the council’s Residential Extensions and Alterations SPD had originally been attached.

That does not make the 2012 guide disappear. The council’s current supplementary planning documents page still lists it as adopted. The accurate status is therefore narrower: the guide remains council-listed design guidance, but its references to Policies BP8 and BP11 are obsolete because the new plan marks both policies as superseded.

There is now a third layer. On 16 June 2026, Cabinet adopted the Becontree Estate SPD and Design Code for properties within its mapped boundary. That document contains newer, address-specific standards and says the general 2012 extensions guidance is itself being updated.

Before using any dimension, establish whether the property is inside the Becontree boundary. The answer changes which current guide is directly relevant.

The borough-wide rear-extension test

Outside the Becontree-specific code, the 2012 guide says that a single-storey rear extension to a terraced or semi-detached home should not normally project more than 3.65 metres from the original rear wall.

Where exceptional circumstances support more depth, the extra part must remain inside a 45-degree line drawn in plan from the corner of the adjacent dwelling. The same guide also says:

a flat roof should be no higher than 3 metres;
pitched-roof eaves should be no higher than 3 metres, with 4 metres overall;
extensions and outbuildings together should not normally cover more than 50 per cent of the garden; and
a two-storey rear extension should not project beyond a 45-degree line taken from the corner of the adjoining property or its solid-roofed extension.

Those are planning design standards. They assess daylight, outlook, scale and overdevelopment. They do not identify a party wall or decide whether notice is required.

The guide’s separate summary of permitted-development limits dates from 2012. Treat that section as a historical snapshot, not confirmation that work is permitted in 2026. Current planning status depends on the legislation, any Article 4 direction, earlier extensions and the address.

Becontree now has a four-metre code

The adopted Becontree Estate code takes a different approach for the estate.

It sets a maximum projection of 4 metres for a single-storey rear extension within its design criteria, with a maximum overall height of 4 metres and maximum eaves height of 3 metres. If the roof is flat, the overall limit is 3 metres.

For a two-storey rear extension, the code’s maximum planning-design depth is the lesser of:

3 metres from the original rear elevation; or
a 45-degree line in plan from the centre of the nearest habitable-room window in the neighbouring property.

The code also limits a side extension to 4 metres overall, 3 metres at the eaves and half the width of the original house. It should be set back 1 metre from the principal elevation. Two-storey side extensions are generally discouraged, and side extensions on corner plots are described as generally inappropriate.

The 3.65-metre borough-wide figure and the 4-metre Becontree figure are not interchangeable. Record which document and address boundary support the design before comparing it with a neighbour’s plans.

One sentence in the new code cites an Act that does not exist

The Becontree code says that where a neighbour’s rear extension already abuts the shared boundary, the new extension should adjoin it with no perceptible gap. It then says: “see also: Party Wall Act, 1994”.

That cross-reference is wrong. The statute is the Party Wall etc. Act 1996.

The planning instruction also cannot answer the boundary question on its own. Before two extensions are joined, establish whether the existing flank wall is:

astride the boundary;
wholly on the neighbouring owner’s land;
wholly on the building owner’s land; or
already a party wall within the statutory definition.

Section 1 does not govern every boundary situation. It has effect only where the adjoining lands are not built on at the line of junction, or are built on there only to the extent of a boundary wall that is neither a party fence wall nor the external wall of a building. A neighbour’s existing extension can therefore mean that the section 1 gateway is not met, depending on where its wall stands and what that wall is.

Where section 1 of the 1996 Act does apply, a new wall astride the boundary needs the adjoining owner’s written consent. Without it, a building owner may instead build a wall wholly on their own land, subject to the section’s notice procedure. Rights affecting an existing party structure require their own analysis.

So “no visible gap” is a planning-design outcome, not proof of ownership, consent or a statutory right. Drawings should show the boundary, wall thickness, eaves, gutter and proposed construction rather than leaving the detail for site.

Barking and Dagenham has two different 45-degree lines

Both local extension guides use a 45-degree line to assess the effect of an extension on a neighbour. The origin varies: the 2012 guide works from a building corner, while the Becontree two-storey test works from the centre of a habitable-room window.

The excavation line in section 6 of the Party Wall etc. Act 1996 is different again. It is drawn downwards from the bottom of the adjoining owner’s foundations towards the proposed excavation.

The statutory tests are:

excavation within 3 metres that will go lower than the bottom of the adjoining owner’s foundations; or
excavation within 6 metres that will go below the 45-degree foundation plane specified by the Act.

Distance alone does not satisfy the three-metre test; the proposed excavation must also go deeper than the neighbour’s foundations. Passing either council planning line does not establish that section 6 is avoided. The party wall notice guide explains the separate notice types and timing.

Basements and flood risk

The adopted Local Plan does not set a general borough-wide basement size cap. Policy DMSI 6 instead controls the flood-risk position.

It says basements are not appropriate in Flood Zone 3b and places restrictions on their use and design in Flood Zones 2 and 3a, referring applicants to section 7 of the borough’s Level 1 Strategic Flood Risk Assessment. It also requires future climate-change risk to be considered where updated modelling indicates a site may move into Flood Zone 2 or 3 conditions.

That planning assessment is separate from section 6 of the Act. For a basement or underpinning proposal, obtain the excavation depth, horizontal distance to each adjoining structure and the best available evidence of neighbouring foundation depth. A flood-risk conclusion does not answer the Party Wall test, and an award does not grant planning permission.

Nearly half the current property stock is interwar

The Becontree Estate’s age is not a minor historical detail. It dominates the borough’s property profile.

As at 31 March 2025, the Valuation Office Agency recorded:

980 properties built before 1900;
2,280 built from 1900 to 1918;
28,630 built from 1919 to 1929; and
12,100 built from 1930 to 1939.

The two interwar bands total 40,730 properties, or 49.79 per cent of the borough’s 81,800 properties. That is the second-highest interwar share among London’s 33 local authorities, behind Harrow.

The adopted Becontree code describes the estate as having been built from 1921 to 1934 and says it originally comprised about 29,000 homes. The official stock data therefore supports the planning document’s account without proving the age or construction of any individual address.

The Valuation Office Agency rounds these counts to the nearest ten, and totals may not sum because of rounding.

At Census 2021, Barking and Dagenham recorded 73,899 households:

30,754 in a terraced house;
16,358 in a semi-detached house;
20,451 in a purpose-built flat or tenement;
3,751 in a detached house;
1,577 in part of a converted or shared house; and
756 in a commercial building.

Terraced and semi-detached homes together account for 47,112 households, or 63.75 per cent. That is the third-highest combined share among London’s 33 local authorities, after Bexley and Havering.

Those forms commonly contain shared walls, but the census is not a legal inspection. It cannot show whether a particular wall is a party wall or whether proposed work falls within the Act.

Article 4: the November date has not arrived

The council made two non-immediate Becontree directions alongside the new code. One covers porches across the estate; the other covers side and roof alterations on mapped corner plots. The council says they will be introduced in November 2026, and the side-and-roof instrument specifies 19 November 2026 if confirmed.

As at this page’s recording date, 24 August 2026, that future date has not arrived. Do not write as though those householder rights have already been withdrawn. Check confirmation and commencement again before work begins.

A separate Article 4 direction for additional storeys above existing residential and commercial properties has applied across the borough, except designated industrial land, since 22 February 2022.

The council identifies four conservation areas, 45 statutorily listed buildings and structures, 123 locally listed buildings, and Barking Abbey as its only scheduled monument. Heritage status and Article 4 controls change the planning route; they do not replace the Party Wall Act.

Explain the property and proposed work

Provide:

the full property address;
whether it falls inside the mapped Becontree Estate boundary;
whether it is terraced, semi-detached, detached or a flat;
which walls, floors or ceilings are shared, and with whom;
whether an existing neighbour’s extension reaches the boundary;
whether the proposed wall would sit astride or wholly to one side of the boundary;
the extension depth, height, eaves, gutter and boundary detail;
the planning 45-degree assessment used and its starting point;
whether excavation or underpinning is proposed, including depth and distance to neighbouring structures;
known or assumed neighbouring foundation depths and the basis for them;
the flood zone and any site-specific flood assessment;
conservation, listing and Article 4 status for the address;
whether you are carrying out work or responding to a neighbour’s work;
drawings, structural details and planning documents where available;
notices, responses and correspondence already exchanged; and
known dates and access constraints.

Compare the proposed appointment

Each quote should explain who would appoint the surveyor and the work included. That may involve reviewing drawings, notices, inspections, a schedule of condition, preparation of an award, liaison with another surveyor or later visits.

The Party Wall surveyor guide explains when a surveyor may be needed, and the Party Wall surveyor cost guide explains the factors that can affect the proposed fee. Neighbouring coverage includes Party Wall surveyors for Havering properties and the wider Party Wall surveyor east London guide.

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