Firms in London who list dormer, hip-to-gable, mansard and roof-light loft conversions, ranked by verified customer reviews and then distance. Nobody pays to move up this list, and a message goes to the one builder you choose.
TrustMark registered building firm in London offering extensions, loft conversions, kitchens and bathrooms, groundworks, structural work and plastering.
Our guide to loft conversion builders covers what the job involves, the approvals it needs and what to check before you hire. For prices, read Loft conversion cost in the UK (2026 guide). Local planning, building control and housing notes are on the London page.