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Brent · Garden Room · 2026

Garden Room Planning Permission in Brent: 2026 Guide

Brent has relatively low conservation area coverage at 9%, so most streets remain eligible for permitted development when the design stays within national limits. Householder approvals in Brent run at around 80% with an average decision time of 10 weeks.

Verdict
May be permitted development

A garden room in Brent can often be permitted development when it stays within size and design limits and no local constraint applies to your address. Always confirm at address level.

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Planning Constraints in Brent for Garden Room

Conservation area coverage
9%
Approval rate (Brent)
80%
Avg. decision time
10 weeks
Article 4 directions
2
Basement works frequently require full permission
HMO controls borough-wide
Metropolitan Open Land in several wards
Article 4 directions in Brent
  • • HMO Article 4 across the borough
  • • Basement 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 Brent

The CanUBuild checker surfaces real recent applications close to your address — approvals and refusals — so you can see what the planning officers at Brent Council 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 Brent?

In Brent, the answer depends on whether your property sits in a conservation area (9% 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 Brent?

Conservation areas in Brent 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 Brent Council assess conservation area proposals against the specific character appraisal for the street.

How long does a garden room application take to decide in Brent?

Brent Council currently averages around 10 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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Check your specific address in Brent

Address-level constraints and recent decisions around the corner. No drawings needed.

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