Rear extension drawings for Lewisham homes, £589
In a Lewisham conservation area any side extension and any rear extension taller than one storey needs permission, and Article 4 directions go further for elevations visible from public viewpoints. We read the direction for your street first.
- £439 drawings + £150 survey (£589 total)
- 27 Article 4 documents checked
- Heritage statement covered
What do rear extension drawings cost in Lewisham?
We charge £589: £439 for the drawings, forms and submission and £150 for the survey visit, with no VAT to add. Lewisham Council’s application fee is paid to the council.
What the Lewisham price covers
- A survey of the rear wall, garden levels and boundaries
- Existing and proposed plans, elevations and sections
- A check of your street against Lewisham’s published Article 4 directions
- A heritage statement brief if the house is in a conservation area
- Submission to Lewisham and replies to the case officer
| Our drawings and submission paid to us | £439 |
|---|---|
| Measured survey paid to us | £150 |
| Council householder fee paid to the council | £548 |
| Total | £1,137 |
We charge £589 in total. The £548 is paid to the council when the application goes in, and the survey is charged once if you later order building regulations drawings for the same house.
What conservation area status adds in Lewisham
Lewisham says planning permission is needed for certain external works to a house in a conservation area, on top of the usual permitted development limits. Its list includes house extensions to the side, house extensions to the rear greater than single storey, cladding, any addition or alteration to the roof, and a garden building to the side of the house (Lewisham conservation area works).
A single-storey rear extension is therefore still governed by Class A in many conservation areas, unless a direction applies. Lewisham also requires a heritage statement with any application affecting a conservation area building, which we check at validation. Flats and subdivided houses have no permitted development rights at all.
Lewisham’s Article 4 directions
Lewisham applies Article 4 directions to named streets and conservation areas, and publishes 27 direction documents, among them Brockley, Culverley Green, Hatcham, Ladywell, Telegraph Hill, Sydenham Thorpes and four in Blackheath. They apply only to houses in use as a single dwelling, and under them external changes to elevations visible from public viewpoints need permission (Lewisham Article 4).
For example, a rear extension on a Telegraph Hill house that cannot be seen from the street is judged differently from one on a corner plot where the back is on show, so we map what can be seen from public viewpoints. Lewisham decided 393 of 413 householder applications inside 8 weeks in the year to June 2026.
Lewisham rear extensions in numbers
- 27
- Article 4 direction documents on Lewisham’s page for conservation areas and named streets. Lewisham: Article 4 directions in conservation areas
- Beyond one storey
- Rear extensions taller than one storey need permission in a Lewisham conservation area. Lewisham: external works to houses in conservation areas
- All side extensions
- Side extensions that need permission in a Lewisham conservation area. Lewisham: external works to houses in conservation areas
- Public viewpoints
- Elevations that Lewisham’s Article 4 directions control: those visible from public viewpoints. Lewisham: Article 4 directions in conservation areas
- 393 of 413
- Lewisham Council householder applications decided within 8 weeks in the year to June 2026, out of all it decided (prior approvals not counted). MHCLG live table PS2, planning application statistics by district, July 2025 to June 2026 (GOV.UK)
- £72.73 per m²
- The Mayor of London’s CIL in Lewisham (band 2) for permissions granted in 2026, owed only when a scheme is liable for CIL in the first place. Mayoral CIL: annual rate summary for 2026, Table 1 (Greater London Authority)
Lewisham rear extension questions
Does a Lewisham conservation area stop a single-storey rear extension?
Not by itself. Lewisham lists side extensions and rear extensions above one storey as needing permission, but an Article 4 direction may add more.
What does an Article 4 direction change?
External changes to elevations visible from public viewpoints need permission, for houses used as a single dwelling.
Do I need a heritage statement?
Lewisham’s legislation note says applications affecting heritage assets, such as buildings in conservation areas, need one.
How fast does Lewisham decide?
It decided 393 of 413 householder cases within 8 weeks last year. We cannot promise a date.
Other services people book with this one
- Prior approval for a larger home extension£349 drawings + £150 survey (£499 total)
- Lawful Development Certificate drawings£389 drawings + £150 survey (£539 total)
- Building regulations drawings£479 drawings + £150 survey (£629 total)
- Side return extension drawings£479 drawings + £150 survey (£629 total)
- Party wall notice£39
Price your Lewisham extension
Send the address and a sketch. We check the direction and reply with a fixed price.