Wraparound Extension Cost London 2026: Complete Price Guide
- LCCL Construction
- 5 days ago
- 3 min read
A wraparound extension — sometimes called a wrap around or L-shaped extension — is one of the most popular and highest-value extension types for Victorian and Edwardian terraced houses in London. It combines a rear extension with a side return extension to create a large open plan kitchen, dining and living space across the entire ground floor. This guide gives you accurate 2026 wraparound extension costs so you can budget realistically before starting your project. LCCL Construction has delivered hundreds of wraparound extensions across London and Hertfordshire.
How Much Does a Wraparound Extension Cost in London in 2026?
A wraparound extension in London costs between £60,000 and £128,000 in 2026 for a full design and build service. The average project cost is £78,000 to £95,000 depending on size, specification and location. This includes all architectural design, planning permission, building regulations, structural calculations, party wall notices where required and all construction works from foundations to finished plaster.
Wraparound Extension Cost by Size in London
Small wraparound (20 sqm): £60,000 to £75,000. Standard wraparound (28 sqm): £75,000 to £95,000. Large wraparound (36 sqm): £95,000 to £128,000. Premium specification in Central London locations can exceed £150,000.
What Affects Wraparound Extension Cost in London?
The key factors are: total size in square metres, specification of glazing and doors including bifold or sliding doors and rooflights, whether planning permission is required, complexity of structural steelwork required to open up the ground floor, the specification of internal finishes including flooring, kitchen island and lighting, and location within London. Premium London postcodes cost 15-25 per cent more than outer London.
What Is Included in a Wraparound Extension Cost?
LCCL Construction wraparound extension costs include everything: measured building survey, architectural design, planning permission, building regulations, structural engineer calculations, party wall notices and agreements where required, all groundworks and foundations, steelwork and structural changes to remove existing walls, superstructure, roof and rooflights, external walls with matching brickwork or render, bifold or sliding doors, first fix electrics and plumbing, insulation, plastering, second fix and decoration. Kitchen units and appliances are typically supplied by the client.
Wraparound Extension vs Rear Extension vs Side Return: Cost Comparison
A rear extension only costs £35,000 to £75,000. A side return only costs £35,000 to £75,000. A wraparound combining both costs £60,000 to £128,000 — significantly less than doing them separately and creates a much larger open plan space. This makes a wraparound the highest value option for Victorian terraces with a side return alley. See our full wraparound extension guide and full home extension cost guide.
How Much Value Does a Wraparound Extension Add?.
A wraparound extension in London typically adds 150 to 300 per cent of the construction cost in property value. A wraparound costing £85,000 typically adds £130,000 to £220,000 in outer London and £200,000 to £400,000+ in premium locations. See our full guide on how much value an extension adds.
Frequently Asked Questions About Wraparound Extension Cost in London
How much does a wraparound extension cost in London?
From £60,000 for a small wraparound to £128,000 for a large wraparound with premium specification.
Is a wraparound extension cheaper than a rear extension plus a separate side return?
Yes — combining both into one wraparound project is significantly more cost-effective than doing them separately due to shared foundations, roof and structural steelwork.
Does a wraparound extension need planning permission?
Most wraparound extensions require planning permission because the side return element typically exceeds permitted development limits. LCCL Construction handles all applications.
To get a free detailed estimate for your wraparound extension call LCCL Construction on 020 8037 7332 or get an instant quote online.
