Wrap-Around Extension Guide: Cost, Planning & Design 2026
A wrap-around extension combines a side return and rear extension into one L-shaped space. It is the most ambitious single-storey option, typically creating a large open-plan kitchen-living-dining room that wraps around the corner of the house.
What you need to know
What is a wrap-around extension?
A wrap-around extends your home on two sides — typically the rear and one side — forming an L-shape when viewed from above. This creates the maximum ground-floor space from a single project. It works particularly well on corner plots and semi-detached properties with side access.
Design possibilities
The L-shape naturally creates distinct zones: a kitchen area in one wing, a dining space in the corner, and a living area in the other wing. Bi-fold doors across the rear connect the space to the garden. Corner glazing where the two wings meet adds dramatic natural light.
Planning and PD
The rear element may fall under PD (up to 4m/8m). The side element typically requires planning permission unless it stays within the existing side wall plane. We assess each wing separately and advise on the most efficient route — sometimes a hybrid approach (PD for the rear, planning for the side) saves time.
How much does it cost?
| Item | Typical Cost Range |
|---|---|
| Build cost (25–40m²) | £55,000–£100,000 |
| Professional fees | £3,000–£6,000 |
| Corner glazing | £3,000–£8,000 extra |
| Kitchen | £10,000–£30,000 |
| Party wall (per neighbour) | £700–£1,500 |
| Contingency (15%) | £8,000–£15,000 |
Prices based on Dorset rates, 2026
Planning permission
Wrap-around extensions usually require planning permission for the side element, even if the rear element falls under PD. We recommend applying for the full project under one planning application for simplicity.
The rear wing may qualify as PD if it meets standard depth limits. Side extensions under PD must not exceed half the width of the original house and must match the existing ridge height. In practice, most wrap-arounds benefit from a single planning application.
Building regulations
Complex junction between the two wings requires careful structural design. Drainage from both wings must be coordinated. The corner area where the wings meet needs particular attention for waterproofing and structural continuity.
Typical timeline
| Phase | Duration |
|---|---|
| Design | 3–4 weeks |
| Planning application | 8–12 weeks |
| Structural and Building Regs | 2–3 weeks |
| Build | 14–20 weeks |
Frequently asked questions
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