House extension drawings in Hither Green
A single-storey rear extension on a Hither Green house that is not detached can reach 3 metres beyond the original rear wall under permitted development, and up to 6 metres through the larger home extension prior approval. DrawingsDirect draws single-storey rear extensions from £695 with no VAT to add, with the price published on the pricing page.
Fixed fee from £495 drawings + £200 survey (£695 total) · all prices
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Where the 3 metre line sits
The General Permitted Development Order lets a single-storey rear extension project beyond the original rear wall of the house by up to 3 metres where the house is not detached. Hither Green has plenty of terraced and semi-detached homes, so this is usually the line that decides your first sketch.
Everything is measured from the original house, meaning the building as it stood before earlier extensions. If a previous owner has already built out the back, that work counts against you, so find out what exists before you plan what to add.
Going to 6 metres: the prior approval route
For a house that is not detached, a larger home extension can reach up to 6 metres beyond the original rear wall, but only after the council has been asked through the prior approval process. It is a separate application from full planning permission, and it still needs proper drawings.
Lewisham's own record shows how this route has gone. Over the last eight quarters the council determined 85 larger home extension prior approvals, and 5% of them were granted. That is a borough-wide count for the whole route, and your outcome depends on your own site and neighbours.
The national planning data lists 30 live conservation-area entries for Lewisham.
When a full planning application is the better choice
If the design needs more than permitted development allows, you apply for householder planning permission. The national fee is £548 for this category of application, paid to the council and separate from any drawing fee.
In the latest four quarters Lewisham decided 578 householder applications and granted 89% of them. Of those decisions, 95% were made within eight weeks. Those figures cover every kind of home improvement, so treat them as the local backdrop and not as a prediction.
What the appeal figures add
Lewisham has 162 householder appeals on record in the Planning Inspectorate casework database, and 30% of them were allowed. A refusal is therefore not always the end, but it does not usually reverse either, which is the case for drawing the application well the first time.
Conservation areas in Lewisham
The national planning data lists 30 live conservation-area entries for Lewisham. Confirm on the council's own map whether your street is covered before you settle on a design.
Fixed fee, published
Single-storey rear extension drawings, covering the survey and the planning or permitted development drawings, start at £695 with no VAT to add. The price is on the pricing page with no form in front of it, and council fees are paid separately to the council.
Sources
Every figure on this page, where it comes from and a link to the original.
| Figure | Source | Link |
|---|---|---|
| £695 | DrawingsDirect starting fixed fee for single-storey rear extension drawings (survey and planning or permitted development drawings), with no VAT to add, from the published price list | drawingsdirect.co.uk |
| 3 metres | GPDO 2015 Sch 2 Pt 1 Class A.1(f)(i): a single-storey rear extension may extend beyond the rear wall of the original house by up to 3 metres, house other than detached (source wording: 3 metres) | www.legislation.gov.uk |
| 6 metres | GPDO 2015 Sch 2 Pt 1 Class A.1(g): larger home extension under the prior approval process (A.4), house other than detached, up to 6 metres beyond the original rear wall (source wording: 6 metres) | www.legislation.gov.uk |
| 85 | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 5% | Our analysis of MHCLG planning application statistics, table PS1 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| £548 | Fees for planning applications in England from 1 April 2026 (MHCLG, SI 2012/2920 as annually indexed), category 6(1): householder application for the enlargement, improvement or alteration of a single dwellinghouse (source wording: £548) | assets.publishing.service.gov.uk |
| 578 | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 89% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 95% | Our analysis of MHCLG planning application statistics, table PS2 (district open data table) (released 24 Sep 2026, quarters to 2026 Q2) | www.gov.uk |
| 162 | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 30% | Our analysis of Planning Inspectorate Casework Database (released 1 Oct 2026 (Casework Database 2609)) | www.gov.uk |
| 30 | Our analysis of MHCLG Planning Data Platform conservation-area and article-4-direction datasets (bulk snapshot retrieved 14 Aug 2026) | www.planning.data.gov.uk |