Barking and Dagenham, London
L-shaped dormer drawings in Barking and Dagenham
An L-shaped dormer over a back addition can add a full room and a bathroom to a Barking and Dagenham house, and we draw it for a fixed quote after a free constraints check, VAT included. The council granted only 66.5 per cent of householder applications in its latest year, so the design has to be right before it is submitted.
Fixed quote after a free constraints check
- MCIAT chartered
- £2m PI insured
- LABC Partnered
- Fixed fees, VAT included
Request a fixed quote
How we work on l-shaped dormer drawings
Nine steps from first call to approval.
Enquiry and constraints check
We check the property against conservation areas, listed status, Article 4 directions, tree preservation orders, flood zone and planning history. We choose the right route and send a fixed quote.
Measured survey
We survey the house on one datum: rooms, levels, boundaries, drains, trees and the neighbours' windows that the 45° and 25° tests depend on.
Design options
We model the house in Revit and show you options in 3D and plan, with the planning strategy and the precedents in your street.
Design frozen
You choose an option in writing. Nothing changes after this without your say.
Independent check
A second chartered technologist checks every sheet against the council's validation checklist and the policy. A senior review signs it off before anything is submitted.
Submission
We prepare the forms, certificates, fee and documents and submit through the Planning Portal.
Officer liaison
We answer the planning officer and make any amendments within five working days, at no charge until approval.
Building regulations
Technical drawings are coordinated with the structural engineer's calculations, the drainage and the planning conditions.
Approval and hand-over
Building control approval, then a next-steps pack covering the commencement notice, party wall timing and CIL.
Free redraws until approval. Every drawing set is checked independently, and the checker is never the person who drew it.
Request a fixed quote
Barking and Dagenham guidance for an L-shaped dormer
The council's householder document is the Residential Extensions and Alterations SPD, and it is the first thing a case officer opens. It does not set a number for an L-shaped dormer that we can quote, so we do not invent one. We design to the national limits and then test the scheme against the guidance on design, neighbours and the street.
Part of the borough is covered by a second document, the Becontree Estate SPD and Design Code. A house on that estate is read against an original design with a strong, repeated look. If your address is there, the roof form has to respect that look, and we read the code before drawing an L.
The borough plan is the Barking and Dagenham 2037 Local Plan. It states the general tests, and the SPD turns them into practice.
Local figures for Barking and Dagenham
| Measure | Value | Period | Source |
|---|---|---|---|
| Conservation areas | 4 named conservation areas published by the council | — | planning.data.gov.uk |
| Article 4 directions | 3 Article 4 directions published by the council | — | planning.data.gov.uk |
| Listed building entries | 49 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Householder decisions | 388 decisions | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications granted | 66.5 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 100 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Households living in a house | 68.8 % of households living in a house or bungalow (detached, semi-detached or terraced) | Census 2021 | nomisweb.co.uk |
| Green Belt share of the council area | 14 % of council area covered by green-belt polygons | — | planning.data.gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Householder applications by street in Barking and Dagenham
| Street | Applications | Approved |
|---|---|---|
| Westrow Drive | 51 | 62% |
| Upney Lane | 35 | 79% |
| Beccles Drive | 34 | 67% |
| Lyndhurst Gardens | 28 | 62% |
| Blake Avenue | 22 | 70% |
| Western Avenue | 22 | 50% |
| Salisbury Avenue | 21 | 74% |
| Lichfield Road | 19 | 56% |
| Melford Avenue | 19 | 75% |
| Rugby Road | 19 | 58% |
| East Road | 18 | 61% |
| Fanshawe Crescent | 18 | 71% |
| Marston Avenue | 18 | 72% |
| Sandringham Road | 18 | 71% |
| Woodbridge Road | 18 | 69% |
Loft enlargement in section: the permitted development limits
A dormer on the rear slope, with the limits that decide whether it needs planning permission.
- A · Extra roof volume allowed
- 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume
- B · Set-back from the eaves
- Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension)
- C · Height limit
- No part higher than the highest part of the existing roof
A low grant rate changes how we draw
In its latest published year Barking and Dagenham decided 388 householder applications and granted 66.5 per cent, yet it decided 100 per cent within eight weeks or an agreed extension. That is a council that is quick and selective at once.
For an L-shaped dormer the lesson is plain. A big roof volume is the kind of scheme that can fall in the refused third, so we show the officer the set-backs, the materials and the effect on the garden neighbours on the drawings themselves, rather than leaving it to a covering letter.
Does your house have the back addition an L needs?
About 68.8 per cent of households here live in a house or bungalow. An L-shaped dormer needs a two-storey back addition, an outrigger, to continue over. Not every house has one, and where it is missing a plain dormer is the better answer, and we say so before you spend on drawings.
Where the addition exists, the rule that makes the L workable is: Eaves-retention and 0.2 m set-back do not apply where the enlargement joins the original roof to the roof of a rear or side extension. That is what lets the new roof run over the junction without the usual step-back.
Volume, height and the conservation question
Permitted development caps the roof you can add: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. Height is limited too: No part higher than the highest part of the existing roof. In a protected area the position is: Class B roof enlargements are not permitted development on article 2(3) land.
The borough has 4 conservation areas and 3 Article 4 directions, and Historic England lists 49 entries. Those are short lists for a London borough, but a short list still covers some streets, and our address check confirms which side you are on.
Shared roofs, stairs and fire safety
A roof shared with a neighbour brings the party wall rules: Party structure notice at least 2 months before work. We prepare the drawings that go with the notice, and the party wall notices service issues them.
The stair is tested on the model, because the allowance is only: Loft conversions where 2.0 m cannot be achieved: 1.9 m at the centre of the stair, 1.8 m at the side (half width). A bigger conversion brings fire duties too: New storey above 4.5 m by loft conversion: protect the full escape route with fire-resisting doors (min E 20) and partitions (min REI 30). Our building regulations drawings in Barking and Dagenham carry both forward.
What the drawings include and the route to a decision
You receive existing and proposed plans, the roof section through the outrigger, the elevations and the location and block plans. We give a fixed quote after a free constraints check, VAT included, since the junction detail changes the effort from house to house. A chartered technologist who did not draw the set checks every sheet.
If the council asks for changes we redraw free of charge until approval. For a simpler roof, compare dormer loft conversion drawings in Barking and Dagenham, see the borough overview in architectural drawings in Barking and Dagenham, or look at Redbridge and Havering nearby.
What you receive
Related pages
Other services in Barking and Dagenham
Questions
Does my Barking and Dagenham house need a back addition for an L-shaped dormer?
Yes, an L-shaped dormer continues over a two-storey back addition. Without one, a plain dormer is usually the right design, and we tell you this at the quote stage.
How many householder applications does the council grant?
In its latest year it granted 66.5 per cent of 388 decisions, which is why we draw with care.
Is the Becontree Estate treated differently?
Yes. The council publishes the Becontree Estate SPD and Design Code, and a house inside it is judged against that design code.
Sources and dates
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- planning.data.gov.uk, retrieved
- lbbd.gov.uk, retrieved
- lbbd.gov.uk, retrieved
- legislation.gov.uk, retrieved
- legislation.gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
Tell us about your property.
We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.