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.

West Drayton · Middlesex

Garden Annexes in West Drayton

Serving the London Borough of Hillingdon planning area · West Drayton (Elizabeth line)

West Drayton's improving housing market and Hillingdon Council planning framework support a straightforward route to a Building Control-compliant garden annexe from £65,000. Our vetted installers deliver full kitchen and bathroom provision with separate utility connections, adding up to £52,000 to properties that are benefiting from sustained Elizabeth line investment and rising buyer expectations.

0.15

U-value

£20,000–£52,000

Value uplift

25–40 days

Build time

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Garden Annexes in West Drayton

The affordable terraces and semis with practical rear gardens that characterise West Drayton make it particularly well-suited to self-contained habitable garden annexe construction. As a Elizabeth line suburb with fast Central London access, the area attracts Heathrow workers and first-time buyers who increasingly see creating independent living space for family members, guests, or rental income as a practical upgrade rather than a luxury. Every build we recommend here includes full Building Control compliance, kitchen and bathroom plumbing, separate utility connections, and fire-rated construction, meeting the 2026 Part L standard that Hillingdon now expects.

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.

Planning Authority: London Borough of Hillingdon

West Drayton is within Hillingdon's planning jurisdiction with standard Permitted Development rules applying across most residential streets. No significant conservation area coverage affects the main residential areas.

Why Choose This?

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.

Garden Annexes in West Drayton — 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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