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Loft conversions in London

Dormer, hip-to-gable and mansard conversions, from the first assessment of head height to Building Regulations approval.

Englehurst — three-storey rear extension including loft level with slate dormer
The brief

A loft conversion brings the roof space of a house into use, adding a floor of accommodation without extending into the garden.

Approach

The studio assesses head height, stair position and structure before any form is drawn. Rear dormer, mansard, hip-to-gable and L-shaped options are tested against the house, the street and the planning context, so that the conversion is proportioned to the building rather than imposed upon it.

Planning and regulation

Many rear dormers fall within permitted development; mansards, hip-to-gable conversions and most proposals in conservation areas require planning permission. Every conversion must meet Building Regulations, including the fire safety requirements that apply when a third storey is added.

Delivery

Structural design, fire strategy and Building Regulations approval are coordinated within a single package, and the studio administers the works through to completion.

Fees

Fees are fixed for each stage and confirmed in writing once the scope is agreed. Construction cost depends on the site, the specification and the procurement route, and is established through an indicative cost plan at feasibility stage.

Frequently asked questions

Is planning permission required for a loft conversion? +
Rear dormers on terraced and semi-detached houses often fall within permitted development. Mansards, hip-to-gable, and anything raising the ridge need planning. Conservation areas almost always need permission. The position of each property is checked before any design work.
How are fees and construction costs established? +
Fees are fixed for each stage and confirmed in writing once the scope is agreed. Construction cost depends on the site, the specification and the procurement route, and is established through an indicative cost plan at feasibility stage.
How long does a loft conversion take? +
3–5 months for design and consents, then 3–4 months on site. A simple rear dormer is quicker; a mansard or L-shaped dormer with planning takes longer. We give you a written programme at the start.
Which type of loft conversion suits a particular house? +
Depends on your roof shape, the street, and your planning position. Mid-terrace with a pitched roof: rear dormer is most cost-effective. Semi-detached with a hipped roof: hip-to-gable plus rear dormer gives most space. We test options in feasibility and recommend the best route.
Does a loft conversion add value to a house? +

Who we work with

  1. 01Homeowners
  2. 02Families
  3. 03Landlords
  4. 04Self-builders
  5. 05Property developers
  6. 06Investors
  7. 07Businesses

Why clients choose us

01Fixed fees

Fees are fixed at each stage and confirmed in writing, so that cost is known before design begins.

02Director-led

A director leads each project from the first conversation to completion, giving continuity at every stage.

03Response

Every enquiry is answered by a director within one working day, and progress is reported at every stage.

04Independent advice

Advice follows the evidence, including where it departs from the initial brief.

05Design quality

Design is resolved in detail before it reaches site, so that the quality of the idea is carried into the built work.

Related services

Services that usually sit alongside this appointment. Fixed fees, staged, with a director leading the work.

Discuss a project with the studio

Provide the site address and a summary of the requirement. A director will respond within one working day.

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