Madison Bloom

4 Nov 2026

Loft conversions in London: planning, timelines and what to expect

From the first visit to the final sign-off, how a typical loft conversion runs.

A loft conversion is one of the most popular ways to add a bedroom without losing garden space. Here is how a typical project runs.

Is your loft suitable?

Head height, roof structure and the position of the stairs all matter. We check these on the first visit and explain the options, from a simple roof-light conversion to a full dormer.

Permissions

Many loft conversions fall under permitted development, but some need planning permission, particularly in conservation areas. All conversions need building regulations approval, and a party wall agreement may be needed with your neighbours.

Timeline

Once designs and approvals are in place, most conversions take between eight and twelve weeks on site. Much of the early work happens from scaffolding, so disruption inside the home is limited.

Staying informed

Clients can follow every stage of their job, with photos and notes, in their online account.

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