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.

Hayes · Middlesex

Garden Annexes in Hayes

Serving the London Borough of Hillingdon planning area · Hayes & Harlington (Elizabeth line)

Hayes is seeing genuine regeneration, and a well-specified garden annexe adds between £20,000 and £55,000 to properties that are already appreciating strongly on the back of Elizabeth line access to Central London. Our Hillingdon-approved installers build fully self-contained annexes from £65,000 with kitchen, bathroom, and Building Control sign-off as standard.

0.15

U-value

£20,000–£55,000

Value uplift

25–40 days

Build time

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Garden Annexes in Hayes

Hayes, regenerating west London suburb near Heathrow, is seeing strong demand for self-contained habitable garden annexe builds among its first-time buyers and young families. The area's affordable terraces and post-war estates with compact gardens provide the space and privacy needed for a high-specification build, while Hillingdon Council's planning framework keeps the process straightforward for most residential plots. Our recommended installers deliver full Building Control compliance, kitchen and bathroom plumbing, separate utility connections, and fire-rated construction as standard on every Hayes project.

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

Hayes is within Hillingdon's planning area and operates standard Permitted Development rules with no significant Article 4 Direction coverage across most residential streets. Your installer will check boundary distances and coverage at the site survey.

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 Hayes — 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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