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.

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 Annexe in Hayes

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

Self-contained living spaces perfect for guests, family, or rental income. Built to our 2026 Part L standard — adding £20,000–£55,000 to your Hayes property. From £65,000.

0.15 W/m²K

U-value

£20,000–£55,000

Value uplift

25–40 days

Build time

£103

LDC fee

Trusted by homeowners in Hayes

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Matched to Hayes installers who know London Borough of Hillingdon planning requirements.

Garden Annexe in Hayes, Middlesex

Hayes has undergone significant regeneration since the opening of the Elizabeth line, which now connects it to Central London in under 30 minutes. This improved connectivity has driven a wave of professional inward migration and property investment — making a well-specified garden room an increasingly valuable home improvement in this rapidly changing area. Hayes's 1930s and post-war housing stock typically features manageable rear gardens suited to compact garden offices and studio builds. With Elizabeth line commuters seeking work-from-home solutions, demand for purpose-built garden offices here has increased sharply since 2022.

Why Hayes Homeowners Choose This Build

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

Wall construction150mm SIPs panels

U-value (wall)0.15 W/m²K

GlazingA-rated argon-filled

Acoustic reduction40dB+ standard

Data infrastructureCAT6A (10Gbps ready)

ElectricsPart P compliant

FoundationsGround screws (no concrete)

Build time25–40 days

FSC-certified timber · Ground screw foundations · Just One Tree partner

Planning in Hayes — 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. The LDC fee is £103. Your installer will check boundary distances and coverage at the site survey.

£103

LDC fee

2.5m

Max height (boundary)

50%

Max garden coverage

London Borough of Hillingdon Portal Full PD Guide 2026

How We Work in Hayes

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.

See Completed Projects Near Hayes

Real builds with specs, materials, and planning routes documented.

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Garden Annexe FAQs — Hayes

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.

“The team connected me with a fantastic installer who built my garden office in under 10 days. It's warm, quiet, and I love working from it every day.”

Sarah J.

Wimbledon, SW London · Garden Office

“Quick, professional, and totally transparent. I compared three quotes and picked the best one. My music studio is perfectly soundproofed.”

David M.

Highgate, North London · Music Studio