Combinando a side return extension with a rear extension, the wraparound creates a dramatic L-shaped space that completely transforms the ground floor of Victorian and Edwardian properties. This is the ultimate guide to planning, costing, and building a wraparound extension in London.
What is a Wraparound Extension?
A wraparound extension involves extending both to the side (into the side return alleyway) and to the rear of your property. By removing the sidewall and rear wall of your existing kitchen, you merge these new areas with the original layout to create a vast, open-plan L-shaped room.
This type of extension is particularly popular in London areas like Wandsworth, Fulham, and Clapham, where terraced housing stock often suffers from narrow galley kitchens and disconnected living spaces.
Key Benefits
- Maximum Space Gain: Typically adds 15-40 square metres of internal floor area.
- Improved Flow: Eliminates the “corridor effect” common in period homes, creating a wide, sociable footprint.
- Connection to Garden: Wraparound designs naturally embrace the garden, often featuring large bi-fold or sliding doors on two aspects.
- Zoning Potential: The L-shape naturally zones the space into kitchen, dining, and living areas without the need for walls.
Planning Permission
Unlike simple rear extensions, wraparound extensions almost always require full Planning Permission. They rarely fall under Permitted Development rights because:
- The extension usually extends beyond the side elevation wall.
- The width often exceeds half the width of the original house.
London Planning Tip: Many councils (like Wandsworth and Lambeth) have specific policies regarding “infill” extensions. They often require the side wall on the boundary to be no higher than 2.5m-3m to protect neighbors’ light. A sloping roof is a common design solution to comply with this.
Cost Breakdown
Wraparound extensions are structural heavyweights. You are essentially supporting the entire back corner of your house on steel beams.
- Shell Cost: £2,500 – £3,500 per m²
- Structural Steelwork: £10,000 – £15,000 (The “Box Frame”)
- Glazing: £15,000 – £30,000 (Sliding doors, roof lanterns)
- Kitchen & Finishes: £25,000 – £50,000+
- Professional Fees: £5,000 – £8,000 (Architect, Structural Engineer)
Total Estimated Budget: £120,000 – £180,000 for a high-spec London finish.
Party Wall Matters
Because you are building right up to the boundary walls on one or both sides, you will certainly need Party Wall Agreements with your neighbors. This process should be started at least 2-3 months before construction begins.
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