Service · London
Loft Conversions in London
Turn unused roof space into a master suite, home office or family room. We design and build dormer, mansard, hip-to-gable and L-shape loft conversions across London — from structural opening to finished ensuite.
Why Prime Build
What you get when you
work with us.
The same in-house team, the same five-stage process, the same 10-year guarantee — across every service we offer.
- Dormer, mansard, hip-to-gable & L-shape loft conversions
- Structural calculations, steel beams and full building-control coordination handled in-house
- Bespoke ensuite design (see our Richmond loft conversion case study)
- Average completion: 10–14 weeks from start to handover
- Adds an average 20–22% to UK home values
Our process
A five-stage process built to remove surprises.
01
Survey
Roof survey to confirm head-height, structural feasibility and conversion type.
02
Design
Loft layout, dormer/mansard design, ensuite planning and natural-light strategy.
03
Permits
Building control, party-wall agreements and planning (where needed) handled by us.
04
Build
Scaffold, structural openings, steels, joists, insulation, plasterboard, finishes — typically 10–14 weeks.
05
Handover
Sign-off, warranty and full snagging walk-through.
Recent loft conversions
Selected projects.
Extension · Richmond, TW10
Richmond Loft Conversion — Ensuite Bathroom
Extension · Richmond, TW10
Richmond Loft Ensuite — Walk-In Shower
Extension · Richmond, TW10
Richmond Loft Ensuite — Industrial Vanity
Extension · Richmond, TW10
Richmond Loft Conversion — Master Bedroom
Extension · Richmond, TW10
Richmond Loft Conversion — Bedroom
Extension · Richmond, TW10
Richmond Loft Family Bathroom
Frequently asked questions
Answers about loft conversions.
Related services
You may also need…
Bathroom Renovations
Whether it's a single ensuite refurb or a complete loft bathroom carved into the eaves, we handle every stage — first-fix plumbing, tiling, sanitaryware, lighting and bespoke joinery — to a hotel-suite standard.
Explore
Structural Work
The hardest part of any renovation is rarely visible once it's finished — the steel beams, structural openings, underpinning and load redistribution that make modern open-plan living possible.
Explore
House Extensions
From single-storey kitchen extensions to full double-storey side-returns, we design and build extensions that add space, value and light to your London home — completed on time, on budget and to a 10-year structural guarantee.
Explore