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Case study · Kingston upon Thames

Single-storey rear extension in Coombe

Approved at first submission by Kingston Council in 10 weeks.

Project summary

Service
Single-storey rear extension
Location
Coombe, Kingston upon Thames
Property stock
1930s detached, Edwardian villas
Article 4 in borough
No
Process duration
10 weeks
Outcome
Approved at first submission

Open-plan kitchen extension with natural light — house extensions in London
The brief

What the client needed

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).

Design response

How we designed it

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.

Planning route

Submission and decision

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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Single-storey rear extension in Coombe — a flat-roof rear extension with rooflights
A flat-roof rear extension with rooflights — single-storey rear extension in Coombe.

Which Coombe postcodes does this house extensions service cover?

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.

PostcodeAreaDominant stockWhat it means for a house extensions
KT2Kingston / Norbiton1930s detached, Edwardian villasKingston / Norbiton sits wholly inside KT2, so Kingston Council validates every house extensions submitted from an KT2 address.
KT3New Malden1930s detached, Edwardian villasKT3 covers New Malden only; Kingston Council handles the house extensions.
KT1KingstonGeorgian fragments, Victorian terraces, 1930s semi-detachedNeighbouring Kingston, where house extensions work is handled by the same Kingston Council case officers.
KT5SurbitonEdwardian villas, mansion blocksNeighbouring Surbiton, where house extensions work is handled by the same Kingston Council case officers.
KT9Chessington1930s semi-detachedNeighbouring Chessington, where house extensions work is handled by the same Kingston Council case officers.
KT5Tolworth1930s semi-detached, post-war flatsNeighbouring Tolworth, where house extensions work is handled by the same Kingston Council case officers.
KT2NorbitonVictorian terraces, Edwardian villasNeighbouring Norbiton, where house extensions work is handled by the same Kingston Council case officers.

Which Coombe neighbourhoods suit a house extensions best?

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.

What local planning policy applies to a house extensions in Coombe?

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.

What happens if a Coombe property sits on a boundary?

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.

Similar project in Coombe?

Same MCIAT team. Same approval discipline.

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Single-storey rear extension in Coombe — a two-storey extension with a balcony
A two-storey extension with a balcony — single-storey rear extension in Coombe.

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