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Kensington and Chelsea · Garden Room · 2026

Garden Room Planning Permission in Kensington and Chelsea: 2026 Guide

Kensington and Chelsea has one of London's highest conservation area coverages at 73%, which affects many garden room proposals. Householder approvals in Kensington and Chelsea run at around 64% with an average decision time of 12 weeks.

Verdict
Depends on constraints

In Kensington and Chelsea, whether a garden room needs planning permission depends on specific constraints — conservation area, Article 4, listed status or flood risk. Check your address to see which apply.

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Planning Constraints in Kensington and Chelsea for Garden Room

Conservation area coverage
73%
Approval rate (Kensington and Chelsea)
64%
Avg. decision time
12 weeks
Article 4 directions
2
Very high conservation area coverage
Basements SPD (April 2016) actively enforced
Dense cluster of listed buildings
Article 4 directions in Kensington and Chelsea
  • • Basement Article 4
  • • HMO Article 4 in specified areas

Permitted Development Rules

Outbuildings including garden rooms are permitted development under GPDO Schedule 2, Part 1, Class E, provided they are incidental to the enjoyment of the house.

  • Maximum height 2.5m if within 2m of any boundary.
  • Maximum eaves height 2.5m and overall height 4m (dual-pitched roof) or 3m (any other roof).
  • Must not be forward of the principal elevation fronting a highway.
  • Total footprint of all outbuildings cannot exceed 50% of the original curtilage.
  • Must be single-storey.
  • Use must be incidental to the dwelling — not primary residential accommodation.
  • Verandas, balconies and raised platforms are not allowed.

Read the full garden room planning guide for the national rules and application process.

Recent Garden Room Decisions in Kensington and Chelsea

The CanUBuild checker surfaces real recent applications close to your address — approvals and refusals — so you can see what the planning officers at Royal Borough of Kensington and Chelsea have approved for comparable schemes. Nearby precedent is one of the strongest signals for your own chances.

See decisions near your address

Frequently Asked Questions

Do I need planning permission for a garden room in Kensington and Chelsea?

In Kensington and Chelsea, the answer depends on whether your property sits in a conservation area (73% of the borough), is listed, or falls within an Article 4 direction. Most garden room proposals are permitted development for houses when they stay within GPDO limits and no local constraint applies. Check your exact address with the CanUBuild checker before spending on drawings.

Can I build a garden room in a conservation area in Kensington and Chelsea?

Conservation areas in Kensington and Chelsea typically remove several permitted development freedoms. For a garden room, the Larger Home Extension route and some external alterations do not apply, so a full householder application is usually required. Planning officers at Royal Borough of Kensington and Chelsea assess conservation area proposals against the specific character appraisal for the street.

How long does a garden room application take to decide in Kensington and Chelsea?

Royal Borough of Kensington and Chelsea currently averages around 12 weeks for householder applications. Complex garden room proposals — particularly those in conservation areas or on listed buildings — can take longer. Prior approval decisions for Larger Home Extensions are typically issued in 42 days.

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