Dagenham, RM8 to RM10

Builders in Dagenham

Get a free quote Call Bes on 07448 465880

Bes Cuni: Registered Building Inspector (Class 2), MCIOB, AssocRICS

If you are looking for builders in Dagenham, the first question is not the price. It is whether your house is on the Becontree estate, and if it is, whether it sits on the corner of a block. BXC Developments is based at 12 Jackson Road, Barking, so Barking and Dagenham Council is our own planning authority, and we check that question before anything is drawn.

Most of Dagenham is Becontree. The London County Council built it in the 1920s and early 1930s as homes for families after the First World War, and about half of the estate lies in what was Dagenham parish. The council puts it at around 29,000 homes, of which about 19,579 are now privately owned. The houses are mainly terraces and cottages in red brick or render, with tall brick chimneys and tiled pitched roofs, and that uniformity is exactly why the estate is a Non-Designated Heritage Asset in the Local Plan 2037, adopted on 18 September 2024.

On 16 June 2026 the council adopted the Becontree Estate Design Code. Its Cabinet had already approved making two Article 4 directions on 11 November 2025: one covering porches on every Becontree home, and one covering side and roof extensions on corner plots. The council says they come in from November 2026, subject to Council approval, and as of 8 November 2026 its website does not yet confirm that they are in force. Check with the council for your address before you build. We do that check as part of the free site visit, then give you a written, itemised quote.

What builders in Dagenham need to check before you build

Three things decide the planning route on a Dagenham job, and none of them is the size of the extension. First, the corner plot. The council's Cabinet report counted about 4,024 privately owned corner properties on the estate, roughly 14 percent of its homes, and those are the houses where side and roof extensions will need planning permission once the corner plot direction is in force. The council's own FAQs say side extensions are generally not encouraged on corner plots, so on a corner house the design has to be worked out against the Design Code from the first sketch. Second, the porch. The other direction covers porches on every Becontree property, which catches the one job most people assume is too small to need permission. Third, whether you are in the Dagenham Village conservation area, one of only four in the borough. There a dormer or any other change to the roof profile needs the council's consent, tree work needs six weeks' written notice, and the borough's Additional Storeys Article 4 direction still applies, because the Secretary of State cut it back to Lymington Mews and Dagenham Village only. Outside those cases a mid-terrace Becontree house normally keeps its permitted development rights, and a Lawful Development Certificate is the way to have that confirmed in writing before work starts.

Bes Cuni, Registered Building Inspector (Class 2) on the Building Safety Regulator register
MCIOB and AssocRICS
Based at 12 Jackson Road, Barking, in the same borough as Dagenham
Free site visit and a written, itemised quote
BXC Developments Ltd, company 12091124, checkable on Companies House

We also cover nearby

Barking
Becontree
Chadwell Heath
Rush Green
Rainham
Ilford
Romford
Hornchurch
Elm Park

Building services for Dagenham homes

Everything below is run by the same team from our Barking office. If your house is on the Becontree estate, start with the guide: it explains the Design Code and the Article 4 directions in plain English.

Becontree extensions and lofts guideWhat the Design Code and the Article 4 directions mean for your house.
House extensionsSingle storey, double storey, side return and wraparound extensions.
Loft conversionsRooflight, rear dormer, hip-to-gable and mansard lofts.
RoofingTiled re-roofs, flat roofs, lead work and chimney repairs.
BricklayingNew walls, structural openings and brick matching on red brick terraces.
Planning in Barking and DagenhamHow the council decides extension and loft applications.

Questions Dagenham homeowners ask builders

Are the Becontree Article 4 directions in force yet?

The council approved making them on 11 November 2025 and says they come in from November 2026, subject to Council approval. When we checked on 8 November 2026, its Article 4 page did not yet confirm they were in force. Before you build a porch on any Becontree house, or a side or roof extension on a corner plot, ask the council whether the direction applies to your address, or apply for a Lawful Development Certificate.

How do I know if my house is on the Becontree estate?

The council's Design Code covers the estate across Alibon, Beam, Becontree, Eastbury, Goresbrook, Heath, Mayesbrook, Parsloes, Valence, Village and Whalebone wards, but a ward name alone does not settle it, because not every street in those wards is part of the estate. The council's Becontree consultation pages carry the boundary map. Give us the postcode and we will check it with you at the site visit.

Can I still build a rear extension on a Becontree terrace without planning permission?

Usually, yes, if the house keeps its permitted development rights. A single-storey rear extension on an attached house can go out 3 metres, or up to 6 metres through the prior approval process, and no higher than 4 metres. The council says many owners can get permission for something larger than that under the Design Code, so a planning application is not always the worse option.

Can I do a loft conversion in Dagenham without planning permission?

On most terraced houses you can add up to 40 cubic metres under permitted development, or 50 on a semi, as long as nothing goes on the roof slope facing the road and the work stays below the ridge. Two exceptions matter here: corner plots on the estate once the Article 4 direction is in force, and homes in the Dagenham Village conservation area, where a dormer needs consent.

What does a dormer loft conversion cost in London?

We do not publish prices, because every roof is different and you get a written, itemised quote after the site visit. As an outside benchmark, Build Team's London guide, updated 25 June 2026, puts a rear dormer with a bedroom and en suite at £45,000 to £75,000 and a hip-to-gable at £50,000 to £90,000, both including VAT. Use those figures to sense-check any quote you receive.

Do I need a party wall agreement on a Becontree terrace?

Almost certainly, because terraces share walls on both sides. Under the Party Wall etc. Act 1996 notice goes to each neighbour between two months and a year before work starts. They have 14 days to agree in writing. Silence is not consent: if they do not reply, the dispute process starts and a surveyor gets involved. It is separate from planning and building regulations, so it needs its own place in the programme.

Bes is a Registered Building Inspector. Does he sign off your work?

No, never. Bes is a Registered Building Inspector (Class 2) on the Building Safety Regulator's register, but no inspector can check his own job. Your extension or loft is inspected by the council's building control service or by an independent approved inspector. What his registration gives you is a builder who knows exactly what that inspector will ask to see, and gets it ready before the visit.

Have you built in Dagenham?

We are based in Barking, in the same borough, and the photographs on this page are from our own London jobs. We do not label them with a town, because we would rather show you real work honestly than put a Dagenham caption on a photo we cannot prove. Ring Bes on 07448 465880 and he will talk you through any of them.

Get a free quote for your Dagenham home

Send your postcode, tell us whether the house is on a corner, and add a line about the job. Bes will tell you which permission route applies before a visit is booked.

Get a free quote Call 07448 465880