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Wrap-around extensions in London

The combined rear and side extension: a single L-shaped volume that reorganises the ground floor of the house.

Portland House — open-plan ground floor created by a rear extension
The brief

A wrap-around extension combines the rear and side extensions into one continuous L-shaped volume, reorganising the ground floor of the house as a whole.

Approach

Because it alters the plan more fundamentally than either extension alone, the design begins with the whole ground floor: circulation, light, views to the garden and the structural strategy that allows walls to be removed. The roof form is resolved early, as it governs both daylight and planning acceptability.

Planning and regulation

Wrap-around extensions usually require a householder planning application. The studio establishes the planning position, the likely views of the local authority and the party wall obligations before design is developed.

Delivery

The project moves through feasibility, concept design, planning, technical design and construction, with structural design coordinated with the architecture throughout.

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

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.
Do wrap-around extensions need planning permission? +
Almost always yes. The combined footprint usually exceeds permitted development limits. We handle the entire process.
Is a wrap-around extension preferable to a rear extension? +
It depends on what you need. A rear extension adds depth. A wrap-around adds depth AND width, creating a much more generous single space. The cost difference is typically 30-50% more than a rear alone. We test both options in feasibility so you can compare directly.
How long does a wrap-around extension take? +
4-6 months for design and planning, then 4-6 months on site. Longer than a simple rear extension because the build is more complex — two foundation runs, corner structural details, wider temporary supports during construction.

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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