Wraparound House Extensions in London: Maximise Your Ground Floor Space

A wraparound extension in London combines a rear extension with a side return extension to create an L-shaped addition that wraps around the back and side of your property. It provides the maximum possible ground floor space and is ideal for creating large open-plan kitchen-dining-living areas. LCCL Construction delivers wraparound extensions across London with prices typically ranging from £72,000 inc. VAT (£60,000 + VAT) to £128,000.

Wraparound House Extensions in London

Can it be done under permitted development?

A single-storey rear extension of 3 m on a terrace or semi (4 m on a detached house), a side-return infill and a side extension up to half the original width are permitted development on a house outside a conservation area or Article 4 street — no planning application, just a Lawful Development Certificate, which we apply for on every one. Fixed-price permitted development extensions start from £42,000 inc. VAT (£35,000 + VAT) at economy specification, design and build inclusive, and the 6 m / 8 m larger home extension goes through a 42-day prior approval notification rather than a full application. See our permitted development projects page for every product with its from-price and the checks we run before we confirm a project qualifies.

Not sure whether your project needs planning permission? Enter your postcode and tick what you want to build — we look up the conservation areas, Article 4 directions and listed buildings for you, and you see which parts are permitted development and the from-price for each. Lawful Development Certificate included on every permitted development job.

Planning check

What Is a Wraparound House Extensions in London?

A wraparound house extensions in London is essentially a rear extension and side return extension built as one combined project. The extension wraps around the corner of your property in an L-shape, filling the side passage and extending the rear wall simultaneously. This creates the largest possible ground floor footprint from a single storey extension. Wraparound extensions are particularly popular on Victorian and Edwardian terraced houses in London where the side return passage and rear garden offer significant potential for additional space. The result is typically a large open-plan kitchen-diner-living area that can be double or triple the size of the original kitchen.

How Much Does a Wraparound Extension Cost in London?

A wraparound extension in London typically costs £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT) in 2026. The cost is higher than a rear extension or side return alone because you are building a larger structure with more complex foundations, structural steelwork and roofing. A standard wraparound on a terraced house creating approximately 25 to 35 square metres of additional space costs £72,000 – £153,600 inc. VAT (£60,000 – £128,000 + VAT). Larger wraparounds on semi-detached or detached properties with high-specification finishes can cost £96,000 – £120,000 inc. VAT (£80,000 – £100,000 + VAT) or more. These prices include all design, structural calculations, building regulations and construction through LCCL Construction's design and build service.

Planning Permission for Wraparound Extensions

Wraparound extensions can sometimes fall under permitted development rights if both the rear and side components individually meet the permitted development size limits. The rear portion must not exceed 6 metres on terraced and semi-detached houses or 8 metres on detached houses. The side portion must not exceed half the width of the original house and must be single storey. However, the combined impact of a wraparound often means planning permission is advisable even if technically not required, particularly in conservation areas or streets with uniform architecture. LCCL Construction assesses each property individually and advises on the best planning approach.

Design Considerations for Wraparound Extensions

Wraparound extensions require careful architectural design to ensure the space flows naturally and receives adequate natural light. The junction where the rear and side portions meet needs particular attention to avoid creating a dark central area. Large rooflights, a glazed roof section over the former side passage, and full-width bi-fold or sliding doors at the rear are essential design elements. Structural steel beams are typically required to create the open-plan layout by removing internal walls. The foundations need to be designed for the L-shaped footprint, which may require deeper foundations in areas with London clay soil. Underfloor heating works exceptionally well in wraparound extensions.

Why Choose LCCL Construction for Your Wraparound Extension?

LCCL Construction has won the LABC Awards Regional Winner 2024 for Best Residential Extension London and has over 20 years of experience delivering wraparound extensions across London. Our design and build service covers everything from initial consultation and architectural design through to construction, project management and finishing. We provide fixed-price quotes with no hidden costs, stage-based payments tied to milestones, a dedicated project manager, and an optional 10-year LABC structural warranty. Call 020 8037 7332, email info@lcclconstruction.co.uk, or book a free consultation at lcclconstruction.co.uk/booking-calendar/free-consultation-call.