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Loft conversion bedroom in London property
Construction — London

Loft
Conversion
London.

Turn your unused loft into a bedroom, bathroom or home office. Dormer, hip-to-gable, Velux and Mansard conversions contact us for a free survey, fully designed and built by our team.

Free
Survey & quote
8–12 wks
Typical project
All London
Boroughs covered
Our options
Every job is different. Contact us for a free quote tailored to your property.
Velux / rooflight conversion
Roof windows only — no external structural changes
Dormer conversion
Rear dormer extension — most popular option for terraced houses
Hip-to-gable conversion
Popular for end-of-terrace and semi-detached houses
Mansard conversion
Maximum space — planning permission required
Request a free quote →

Congestion charge may apply for central London postcodes.

About loft conversions

Unlock your
loft space.

A loft conversion is one of the most cost-effective ways to add living space to a London property. By converting otherwise unusable roof space into a habitable room, you can add one or two bedrooms without the disruption and planning complexity of a ground floor extension.

The most common type in London terraced houses is a rear dormer — a box-like extension of the roof slope that creates full standing height across most of the new floor. Hip-to-gable conversions are popular in semi-detached properties and can be combined with a rear dormer for maximum space.

Most loft conversions in London fall under Permitted Development, though conservation areas and certain Article 4 zones require full planning consent. We advise on your specific position and manage any applications required.

Why choose us

Why London
homeowners choose us.

01
Full design and build

We manage design, structural engineering, planning (where required) and all construction and finishing trades — one contract, one team.

02
Party wall expertise

Most loft conversions in terraced houses require Party Wall Agreements with both neighbours. We refer you to a qualified surveyor and coordinate the process.

03
En-suite capability

We can include a full en-suite bathroom or WC within the loft conversion, with all plumbing and electrical work carried out by our own teams.

04
Staircase design

The new staircase is one of the most challenging design elements of a loft conversion. We work with you to find the best position that minimises impact on the floor below.

What's included

Complete
conversion.

Design drawings
Architectural drawings showing the proposed layout, staircase position and dormer design
Structural engineering
Steel beam calculations and connection details for all structural elements
Planning & Building Regs
Planning application where required, plus Building Regulations application and inspections throughout
Steelwork & structure
RSJ installation, new floor joists, dormer framing and roof modifications
Roofing
New flat or pitched dormer roof with breathable membrane and matching tile or felt finish
Windows & rooflights
Velux rooflights or dormer windows supplied and fitted
Insulation & boarding
Full insulation to current Building Regulations standards, plasterboarding and skim
Electrics, plumbing & decoration
All first and second fix trades by our own teams including en-suite if required
How it works

Design to
completion.

01
Survey & feasibility
We assess your loft to confirm headroom, structure and conversion type, and advise on the most suitable approach.
02
Design & approvals
Drawings produced, structural engineering commissioned and Building Regulations application submitted.
03
Build
Structural work, roofing, windows, insulation and all internal fit-out carried out by our teams.
04
Handover
Building Control sign-off, all certificates issued, final decoration complete and ready for use.
Common questions

Questions
answered.

How do I know if my loft is suitable for conversion?
The key measurement is head height — you need at least 2.2m from floor joist to ridge for a conversion to be practical. We assess this at the initial survey at no charge.
Does a loft conversion require planning permission?
Most dormer and hip-to-gable conversions fall under Permitted Development. Mansard conversions, properties in conservation areas and those already extended may require planning. We advise case by case.
Will I need a Party Wall Agreement?
If your property is semi-detached or terraced, the structural work will likely require a Party Wall Agreement with your neighbours. We recommend appointing a surveyor early to avoid delays.
Can I have an en-suite in the loft?
Yes — we include en-suite bathrooms in many of our loft conversions. The plumbing is run alongside the structural works, avoiding the need to revisit finished areas later.
How much does a loft conversion add to property value?
A well-designed loft conversion typically adds 15–25% to a property's value in London. The return on investment is usually higher than a ground floor extension of equivalent cost.
London-wide service

Unlock your
loft space.

Get in touch

Request a callback.

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Message us
Call GMAS — 07498 597339