Lee / Grove Park — covered by Lewisham Council.
Planning permission drawings delivered by an MCIAT chartered team.
Building regulations drawings delivered by an MCIAT chartered team.
Loft conversion drawings delivered by an MCIAT chartered team.
House extension drawings delivered by an MCIAT chartered team.
Mansard roof extensions delivered by an MCIAT chartered team.
Garage conversion drawings delivered by an MCIAT chartered team.
Basement conversion drawings delivered by an MCIAT chartered team.
Structural calculations delivered by an MCIAT chartered team.
Measured building survey delivered by an MCIAT chartered team.
Party wall services delivered by an MCIAT chartered team.
Rear dormer drawings delivered by an MCIAT chartered team.


SE12 primarily covers Lee / Grove Park in Lewisham. It also touches Bromley.
Decisions for SE12 are made by Lewisham Council. Standard Permitted Development rules apply for most rear extensions and loft conversions on terraced and semi-detached houses, unless the property is in a conservation area, is listed, or sits under an Article 4 Direction. Article 4 in Lewisham: No.
Building regs from £950. We do not charge hourly. Free site survey across all SE12 addresses.
From first call to planning decision: typically 12–14 weeks. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination. Lewisham Council timelines align with the national norm.
Lee / Grove Park in SE12 is characterised by the housing stock of Lewisham — broadly victorian and edwardian terraces across brockley, honor oak, forest hill.

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Every SE12 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. SE12 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| SE12 | Lee / Grove Park | mixed Victorian and inter-war stock | SE12 straddles a boundary: Lee / Grove Park addresses fall to Lewisham Council or Bromley Council, so confirm which authority validates the drawing package before submitting SE12 drawings. |
| SE4 | Brockley | Victorian and Edwardian terraces | Adjoining district to SE12, also inside Lewisham for drawing package purposes. |
| SE6 | Catford / Bellingham | 1930s semi-detached, post-war flats | Adjoining district to SE12, also inside Lewisham for drawing package purposes. |
| SE8 | Deptford | Georgian terraces, post-war estates, new-build | Adjoining district to SE12, also inside Lewisham for drawing package purposes. |
| SE20 | Anerley / Penge | Victorian and Edwardian terraces | Adjoining district to SE12, also inside Bromley for drawing package purposes. |
| BR1 | Bromley / Bickley | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to SE12, also inside Bromley for drawing package purposes. |
| BR2 | Hayes / Keston | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to SE12, also inside Bromley for drawing package purposes. |
| BR3 | Beckenham | Edwardian villas, 1930s semi-detached | Adjoining district to SE12, also inside Bromley for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few SE12 streets, and each one changes what a drawing package can achieve at that address.
SE12 (Lee / Grove Park) conservation designations: there are 30 across Lewisham Council, Deptford High Street, Forest Hill, Hither Green among them. Designation costs a SE12 (Lee / Grove Park) owner the permitted-development route: a drawing package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Blackheath is the SE12 (Lee / Grove Park) designation that most often changes a drawing package design.
Article 4 and your SE12 (Lee / Grove Park) drawing package: Lewisham Council has made no borough-wide direction, so permitted development for a drawing package in SE12 (Lee / Grove Park) generally survives outside SE12 (Lee / Grove Park) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SE12 owner records that a drawing package was lawful.
What SE12 (Lee / Grove Park) is built from: Victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford. Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD. That mix decides the drawing package route in SE12 (Lee / Grove Park) more than the postcode does, and it is what a Lewisham Council case officer reads first. A householder application costs £548 paid to Lewisham Council direct, with 8 weeks to a decision once validated.
SE12 (Lee / Grove Park) conservation designations: there are 48 across Bromley Council, Chislehurst, Beckenham, Keston among them. Designation costs a SE12 (Lee / Grove Park) owner the permitted-development route: a drawing package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Bromley Town is the SE12 (Lee / Grove Park) designation that most often changes a drawing package design.
Article 4 and your SE12 (Lee / Grove Park) drawing package: Bromley Council has made no borough-wide direction, so permitted development for a drawing package in SE12 (Lee / Grove Park) generally survives outside SE12 (Lee / Grove Park) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SE12 owner records that a drawing package was lawful.
What SE12 (Lee / Grove Park) is built from: Large 1930s detached and semi-detached in Chislehurst and Bickley; Edwardian in Beckenham; Victorian in Bromley town; Metropolitan Green Belt covers significant rural-fringe land. Largest London borough by area; substantial Green Belt; conservation areas in most town centres; generally permissive elsewhere. That mix decides the drawing package route in SE12 (Lee / Grove Park) more than the postcode does, and it is what a Bromley Council case officer reads first. A householder application costs £548 paid to Bromley Council direct, with 8 weeks to a decision once validated.
Sources for this SE12 drawing package page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
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