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Garden RoomsGarden Annexes

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.

0.15 W/m²K

U-value

5–15%

Value uplift

25–40 days

Build time

From £65,000

Starting price

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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

1

Feasibility Assessment

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

2

Planning Application

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

3

Building Control

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

4

Complete Construction

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

Garden Annexe — by Area

Local planning notes, council LDC information, and area-specific installer guides.

Eastcote
Middlesex
+£30,000–£70,000
Hampstead
North London
+£65,000–£145,000
Harefield
Middlesex
+£25,000–£60,000
Harrow
Middlesex
+£30,000–£75,000
Hayes
Middlesex
+£20,000–£55,000
Ickenham
Middlesex
+£35,000–£80,000
North Harrow
Middlesex
+£28,000–£68,000
Northolt
Middlesex
+£20,000–£50,000
Northwood
Middlesex
+£40,000–£95,000
Pinner
Middlesex
+£38,000–£88,000
Rickmansworth
Hertfordshire
+£35,000–£85,000
Ruislip
Middlesex
+£35,000–£82,000
Stanmore
Middlesex
+£40,000–£90,000
Uxbridge
Middlesex
+£28,000–£68,000
Watford
Hertfordshire
+£28,000–£65,000
West Drayton
Middlesex
+£20,000–£52,000
West Hampstead
North London
+£55,000–£125,000
Bushey
Hertfordshire
+£30,000–£72,000

Garden Annexe FAQs

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.

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