Dormer, mansard and hip-to-gable conversions delivered end-to-end with fixed pricing and a 10-year workmanship warranty.
We deliver survey, structural design, dormer construction, insulation, glazing and full interior fit-out. Stair design, fire compliance and Building Control are all coordinated by us — one contractor, one programme.
Roof windows, insulation, internal re-fit.
Shell, insulation, windows, staircase & interior finishes.
Structural alterations, larger shell, more complex detailing.
Depending on plumbing runs, tiling & custom cabinetry.
Indicative only — confirmed after survey & design pack.
Head-height checks, stair routing, load paths & fire strategy.
Drawings, structural calcs, PD/planning & Building Control.
Shell, insulation, windows, stairs, MEP, plaster & finishes.
Certification, warranties and snag-free handover.
A mansard loft conversion in Islington transformed unused attic space into a bright, luxurious master suite with ensuite and dressing area. Designed to maximise daylight and finished head height while staying compliant with London Building Regulations.
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A few recent lofts and large refurbishments delivered across London.
Rear glass roof, steel doors and bespoke cabinetry.
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“The loft has transformed our home — bright, warm and perfectly finished.”
“They handled planning and Building Control seamlessly. Great comms.”
“Fixed price, clear programme, zero surprises. Highly recommend.”
CHAS Accredited
FMB Member
SafeContractor
TrustMark
Forge Build proudly serves homeowners and developers across London and the South East, delivering loft conversions, extensions, and full refurbishments to the highest standards.
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Many lofts fall under permitted development. Mansards and front dormers often need planning. We advise and handle applications.
Aim for 2.2m+ finished head height. We’ll survey and propose options (dormer, steel config, lowered ceilings below) to achieve it.
Yes. Structural calcs, insulation, fire safety and stairs are coordinated to meet regs, with certification at handover.
Book a free site visit — get expert advice, a clear programme and a fixed-price quote.