Mitcham — covered by Merton 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.


CR4 primarily covers Mitcham in Merton.
Decisions for CR4 are made by Merton 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 Merton: No.
Building regs from £950. We do not charge hourly. Free site survey across all CR4 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. Merton Council timelines align with the national norm.
Mitcham in CR4 is characterised by the housing stock of Merton — broadly victorian villas in wimbledon.

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Every CR4 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. CR4 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| CR4 | Mitcham | 1930s semi-detached, post-war estates | Mitcham sits wholly inside CR4, so Merton Council validates every drawing package submitted from an CR4 address. |
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | Adjoining district to CR4, also inside Merton for drawing package purposes. |
| SW20 | Raynes Park | Victorian villas, Edwardian terraces | Adjoining district to CR4, also inside Merton for drawing package purposes. |
| SM4 | Morden | 1930s semi-detached, post-war flats | Adjoining district to CR4, also inside Merton for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few CR4 streets, and each one changes what a drawing package can achieve at that address.
CR4 (Mitcham) conservation designations: there are 28 across Merton Council, Wimbledon Common, Wimbledon Village, John Innes among them. Designation costs a CR4 (Mitcham) 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. John Innes is the CR4 (Mitcham) designation that most often changes a drawing package design.
No blanket Article 4 over CR4 (Mitcham): Merton Council has not withdrawn permitted development across CR4 (Mitcham), so a drawing package outside a CR4 (Mitcham) conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a CR4 owner wants on file.
The building fabric around CR4 (Mitcham): Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham. Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive. A drawing package in CR4 (Mitcham) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Merton Council.
Sources for this CR4 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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