Approved at first submission by Kingston Council in 10 weeks.
A family in Coombe approached us for single-storey rear extension on a 1930s detached property. Constraints: respecting streetscape rhythm typical of Kingston upon Thames, maintaining rear garden depth, and meeting Kingston Council's design expectations for the conservation context (22 conservation areas borough-wide).
Measured survey week 1. Three design iterations balancing internal layout against external massing visible from neighbours. Two scheme massings tested against Kingston Council's adopted design guidance. Chosen scheme matched existing roof pitch, used matching brick, set the new opening back from the eaves.
Submitted to Kingston Council via the Planning Portal. Permitted Development eligibility confirmed via parallel LDC. Officer comments minor, addressed in 5 days. Approved at first submission.
Decision recorded Kingston Council, statutory determination period.

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Every Coombe postcode district we draw in, the stock that dominates it and the authority that validates a house extensions there. Coombe fees below are the statutory England rates for 2026, not house extensions estimates.
| Postcode | Area | Dominant stock | What it means for a house extensions |
|---|---|---|---|
| KT2 | Kingston / Norbiton | 1930s detached, Edwardian villas | Kingston / Norbiton sits wholly inside KT2, so Kingston Council validates every house extensions submitted from an KT2 address. |
| KT3 | New Malden | 1930s detached, Edwardian villas | KT3 covers New Malden only; Kingston Council handles the house extensions. |
| KT1 | Kingston | Georgian fragments, Victorian terraces, 1930s semi-detached | Neighbouring Kingston, where house extensions work is handled by the same Kingston Council case officers. |
| KT5 | Surbiton | Edwardian villas, mansion blocks | Neighbouring Surbiton, where house extensions work is handled by the same Kingston Council case officers. |
| KT9 | Chessington | 1930s semi-detached | Neighbouring Chessington, where house extensions work is handled by the same Kingston Council case officers. |
| KT5 | Tolworth | 1930s semi-detached, post-war flats | Neighbouring Tolworth, where house extensions work is handled by the same Kingston Council case officers. |
| KT2 | Norbiton | Victorian terraces, Edwardian villas | Neighbouring Norbiton, where house extensions work is handled by the same Kingston Council case officers. |
Roof pitch, wall build-up and plot depth change every few Coombe streets, and each one changes what a house extensions can achieve at that address.
Coombe conservation designations: there are 22 across Kingston Council, Surbiton, Hampton Wick, Coombe Hill among them. Designation costs a Coombe owner the permitted-development route: a house extensions then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Coombe Hill is the Coombe designation that most often changes a house extensions design.
Coombe permitted development status: there is no borough-wide direction from Kingston Council, so a house extensions at a KT2 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a Coombe sale to argue it later.
The building fabric around Coombe: Edwardian villas in Surbiton and New Malden; Victorian terraces in Kingston central; 1930s semi-detached in Chessington and Tolworth; post-war in New Malden. Outer south-west London suburban; generally permissive; riverside conservation areas add character in Kingston town. A house extensions in Coombe is scoped against that stock first.
Sources for this Coombe house extensions 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.
Same MCIAT team. Same approval discipline.
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