Hammersmith and Fulham has one of London's highest conservation area coverages at 56%, which affects many garden room proposals. Householder approvals in Hammersmith and Fulham run at around 71% with an average decision time of 11 weeks.
In Hammersmith and Fulham, 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.
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.
Read the full garden room planning guide for the national rules and application process.
The CanUBuild checker surfaces real recent applications close to your address — approvals and refusals — so you can see what the planning officers at Hammersmith and Fulham Council have approved for comparable schemes. Nearby precedent is one of the strongest signals for your own chances.
In Hammersmith and Fulham, the answer depends on whether your property sits in a conservation area (56% 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.
Conservation areas in Hammersmith and Fulham 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 Hammersmith and Fulham Council assess conservation area proposals against the specific character appraisal for the street.
Hammersmith and Fulham Council currently averages around 11 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.
Address-level constraints and recent decisions around the corner. No drawings needed.