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Loft Conversions in London: More Space Without Moving
If your home is starting to feel tight, you’re not alone. Many London homeowners reach the point where one extra bedroom, a proper home office, or an additional bathroom would change day-to-day life, however moving feels like the most expensive, disruptive option.
A loft conversion is often the smartest way to get the space you need while staying in the neighbourhood you already love. Done well, it can transform an underused attic into a bright, practical room that adds real value to your property.
Common worries we hear (and how we help)
It’s completely normal to feel cautious before starting building work, especially if you’ve heard stories about projects running over budget, dragging on for months, or leaving a home in chaos.
Homeowners typically come to us because they want:
- Clear costs (so there are no nasty surprises)
- A realistic timeline (so life can keep moving)
- A team they can trust (not a rotating cast of trades)
- Minimal disruption (especially with kids, work-from-home, or busy schedules)
- A finish that looks right (not “good enough”)
That’s why LLAC manages the full process, from the first site visit and design through to permissions support, construction and final inspection.
Our Loft Conversion Process
We manage every stage of your project with transparency and technical precision, from the initial sketch to the final sign-off.
01
Consultation & Site Visit
A free expert assessment of your roof space, structure, and potential layouts to define what is possible for your home.
02
Design & Architectural Planning
Detailed 3D designs and floor plans tailored to your needs, ensuring structural integrity and maximizing both light and floor area.
03
Planning & Permits
We handle all local London council submissions, including full planning permission or lawful development certificates.
04
Structural Work & Shell
The core construction phase. Steel installation, floor joists, and external roofing, converting the space into a secure room shell.
05
Internal Fit-Out
Plumbing, electrical works, insulation, and plastering. We bring in our skilled trades to transform the shell into a functional living space.
06
Finishing & Final Inspection
Second-fix installs, painting, and clean-up. Completion is only defined after a rigorous final inspection and building control sign-off.
Types of Loft Conversions & Typical Costs
Costs provided are estimated guides and are subject to a detailed site survey and your specific requirements.
Velux / Rooflight
What it is: The simplest conversion, involving skylights without altering the roof shape.
Best for: Budget-friendly projects with sufficient headroom.
Cost range: £30,000 – £40,000
Mansard
What it is: Alteration of the entire roof slope to nearly vertical, maximizing internal space.
Best for: Terraced houses seeking a full additional floor.
Cost range: £70,000 – £95,000
Dormer
What it is: A vertical wall from the slope of the roof, creating extra floor space and headroom.
Best for: Most London homes needing a standard master suite.
Cost range: £45,000 – £65,000
L-Shaped Dormer
What it is: Two dormers joined together, usually over the main house and the rear outrigger.
Best for: Victorian properties requiring multiple rooms.
Cost range: £65,000 – £95,000
All costs are approximate and subject to a site survey and specification.
Hip-to-Gable
What it is: Straightens a slanted roof to create a vertical wall, significantly increasing volume.
Best for: Semi-detached or end-of-terrace properties.
Cost range: £50,000 – £75,000
Custom / Bespoke
What it is: Tailored architectural solutions blending multiple types for unique London spaces.
Best for: Heritage buildings or complex design requirements.