Waltham Forest, London
Rear extension drawings in Waltham Forest
Rear extension drawings for a Waltham Forest house start at £695 including VAT. The borough has just adopted a new householder guide that sets no maximum depth but controls boundary height and applies the 45-degree test in plan and elevation. We draw both tests on the sheets.
From £695 (VAT included)
- MCIAT chartered
- £2m PI insured
- LABC Partnered
- Fixed fees, VAT included
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Waltham Forest's new rules for rear extensions
The council's Residential Alterations and Retrofit SPD is recent, and it works through two clear tests. The first covers longer single-storey extensions where nothing has been built next door: 2.4 m boundary height (over 3 m deep). For a terraced or semi-detached house, the roof at the side boundary must stay low and the ridge must sit below the first-floor sill.
The SPD sets no other maximum depth, which moves the argument from a number to the drawings. A longer extension can be acceptable if the boundary height, the roof and the neighbour test are right.
The second test is the 45-degree test: 45 degrees (plan and elevation). It applies to single and multi-storey extensions. The line from the corner of the extension must not pass beyond the centre of the neighbour's window, and in elevation it is drawn from half-way down a sloping roof, with a fixed window point for full-height openings.
Local figures for Waltham Forest
| Measure | Value | Period | Source |
|---|---|---|---|
| Where there is no extension next door (terraced or semi-detached), single-storey rear extensions longer than 3 m should not exceed 2.4 m high at the side boundary; ridge below first-floor sill. The SPD sets no other maximum depth. | 2.4 m boundary height (over 3 m deep) | — | walthamforest.gov.uk, Waltham Forest Residential Alterations and Retrofit SPD (adopted June 2026), p.32, para 7.5.4 |
| 45-degree test applies to single and multi-storey extensions in plan and elevation; the line from the extension corner must not pass beyond the centre of the neighbour's window; in elevation drawn from half-way down a sloping roof, window point at 2 m for full-height openings. | 45 degrees (plan and elevation) | — | walthamforest.gov.uk, Waltham Forest Residential Alterations and Retrofit SPD (adopted June 2026), pp.30-31, 45-degree test |
| Article 4 directions | 15 Article 4 directions published by the council | — | planning.data.gov.uk |
| Conservation areas | 15 named conservation areas published by the council | — | planning.data.gov.uk |
| Listed building entries | 118 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Green Belt share of the council area | 22 % of council area covered by green-belt polygons | — | planning.data.gov.uk |
| Householder decisions | 771 decisions | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications granted | 81.5 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 90.7 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| GPDO 2015 Sch 2 Pt 1 Class A, para A.1(f)(i) | 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey | — | legislation.gov.uk |
| Approved Document L Vol 1 2021 incl. 2023 amendments, Table 4.2 | New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4 | — | 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 Waltham Forest
| Street | Applications | Approved |
|---|---|---|
| Browning Road | 22 | 82% |
| Blenheim Road | 16 | 67% |
| Ulverston Road | 14 | 55% |
| Capworth Street | 13 | 64% |
| Clacton Road | 12 | 55% |
| St Johns Road | 12 | 67% |
| The Avenue | 11 | 91% |
| Grange Park Road | 10 | 100% |
| Murchison Road | 10 | 88% |
| Oakdale Road | 10 | 70% |
| Sky Peals Road | 10 | 75% |
| Woodberry Way | 10 | 63% |
| Albert Road | 9 | 75% |
| Badlis Road | 9 | 89% |
| Colchester Road | 9 | 56% |
Single-storey rear extension: the permitted development limits
The house in section with a rear extension; the dashed lines mark the zone near the boundary.
- A · Depth beyond the original rear wall
- 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey
- B · Maximum height
- 4 m
- C · Within the zone near the boundary
- Eaves no higher than 3 m where within 2 m of the curtilage boundary
- D · Larger extension under prior approval
- 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI
Drawing the tests so the officer can check them
With no depth cap, the burden of proof sits on the drawings. We mark the 45-degree line on the plan from the extension corner and repeat it on the elevation from the half-way point of any sloping roof, so the officer can verify the result at a glance.
We also draw a section across the side boundary showing the wall height, the eaves and the ridge against the first-floor sill. If an adjoining owner has already extended, the guide treats the situation differently, so the survey records what is built next door.
Retrofit and the national limits
The SPD is titled around alterations and retrofit, and a rear extension is a chance to improve the whole house. The Building Regulations set minimum values for new fabric: New elements in existing dwellings, limiting U-values W/(m²·K): roof 0.15, wall 0.18, floor 0.18, windows 1.4 (or WER Band B), doors 1.4. We coordinate those with the design from the start.
On the planning side, national rules still apply: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey for permitted development, with prior approval for more: 6 m (attached) / 8 m (detached), single storey, height max 4 m; not on article 2(3) land or an SSSI. A Lawful Development Certificate in Waltham Forest records what a house can do without an application.
Article 4, conservation areas and the Green Belt
Waltham Forest has 15 Article 4 directions and 15 conservation areas, and Historic England lists 118 entries. Where a direction applies, permitted development rights are removed for the matters it names, so a householder application replaces the shortcut.
About 22 per cent of the borough is covered by Green Belt designation, and the borough records 231 tree preservation orders. We check each against your address at the start.
How the council has been deciding householder applications
Waltham Forest decided 771 householder applications in its latest published year and granted 81.5 per cent. Some 90.7 per cent were decided within eight weeks or an agreed extension. Gardens cover about 24.4 per cent of the borough's land in the Greater London land-use survey.
These borough-wide figures describe the past. They show how the council works, not how any one scheme will fare.
Price, checking and what is included
Our rear extension drawings start at £695, VAT included and fixed before you commit. The set has existing and proposed plans, elevations and sections, with a location plan and block plan. A second chartered technologist checks each sheet, and we redraw at no charge if the council asks for changes.
Our building regulations drawings in Waltham Forest carry the technical detail for the builder.
Related drawings and nearby boroughs
For a different shape, see side return extension drawings in Waltham Forest or house extension drawings. The borough as a whole is at architectural drawings in Waltham Forest.
Neighbours use other rules: Redbridge, Enfield and Hackney. The national picture is on our rear extension drawings page.
What you receive
Related pages
Other services in Waltham Forest
Questions
Is there a maximum rear extension depth in Waltham Forest?
The SPD sets no maximum depth beyond its boundary rule. It controls height at the boundary for longer single-storey extensions: 2.4 m boundary height (over 3 m deep).
What is the 45-degree test?
A line from the corner of the extension must not pass beyond the centre of the neighbour's window, checked at 45 degrees (plan and elevation). We draw it on the plan and the elevation.
Does the new SPD change permitted development?
No. National limits still apply: 3 m (attached) / 4 m (detached) beyond the original rear wall, single storey. The SPD guides applications that need permission.
How much do rear extension drawings cost in Waltham Forest?
From £695 including VAT, fixed up front. The council's householder fee of £548 is separate.
Sources and dates
- walthamforest.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- legislation.gov.uk, retrieved
- gov.uk, retrieved
- walthamforest.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- data.london.gov.uk, retrieved
- ribblevalley.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.
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