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Garden Annexe in London

Self-contained living spaces perfect for guests, family, or rental income. Built to our 2026 Part L standard — adding 5–15% to your property value.

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Self-contained garden annexe with kitchen and living area in London
From £65,00025–40 days
0.15 W/m²KU-value
25–40 daysBuild time
From £65,000Starting price

Why Choose a Garden Annexes?

Provide comfortable, independent living space for family members with a self-contained garden annex. Perfect for elderly relatives (Granny Annexes), young adults needing independence, guest accommodation, or even rental income. Our recommended installers build fully habitable homes to building control standards, complete with kitchens, bathrooms, and living areas. They offer a cost-effective alternative to care homes, house extensions, or buying a separate property.

Keep family close while maintaining independence and privacy
Cost-effective alternative to care homes or house extensions
Increase your property value significantly
Faster construction compared to traditional building extensions
Potential rental income stream (subject to planning)

2026 Technical Specification

Full kitchen and bathroom installation
Building Control compliant construction
Accessible design options (ramps, wet rooms, wide doorways)
High-performance insulation exceeding Part L requirements (U-value 0.15 W/m²K)
Separate utility connections and metering

How It Works

Feasibility Assessment

Check planning viability, site suitability, and building control requirements for habitable space.

Planning Application

Full management of the planning permission process, including design and submit documentation.

Building Control

Ensuring all regulations for habitable space are met, including fire safety and accessibility.

Complete Construction

Full build including all utilities, plumbing, electrics, and interior finishes.

Areas We Cover

Vetted local installers across north and west London suburbs. Tap an area for local planning notes and value uplift.

Harrow
Middlesex
+£30,000–£75,000
Pinner
Middlesex
+£38,000–£88,000
Stanmore
Middlesex
+£40,000–£90,000
Ruislip
Middlesex
+£35,000–£82,000
Northwood
Middlesex
+£40,000–£95,000
Watford
Hertfordshire
+£28,000–£65,000
Hampstead
North London
+£65,000–£145,000
Highgate
North London
From £35,000
Chelsea
Prime Central London
From £35,000
Notting Hill
Prime Central London
From £35,000
Chiswick
West London
From £35,000
Wimbledon
Richmond & South West London
From £35,000

Garden Annexe FAQs

Do I need planning permission for a garden annex?
Yes. Garden annexes intended for sleeping or living accommodation almost always require planning permission. Our partner installers manage the full application process on your behalf and can advise on the likelihood of approval in your specific borough.
Can I rent out a garden annex?
This depends on your planning permission conditions. Some approvals restrict use to 'ancillary' accommodation for family only, while others permit independent letting. We recommend discussing your intentions with your installer at the feasibility stage.
How much does a garden annex cost?
Garden annexes typically start from £65,000 and range to £120,000+ depending on size, specification, and finishing level. While this is more than a standard garden room, it's significantly less than a traditional extension or buying additional property.

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