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.

North Harrow · Middlesex

Garden Annexes in North Harrow

Serving the London Borough of Harrow planning area · North Harrow (Metropolitan line)

North Harrow's established family demographics are driving real demand for garden annexes as a cost-effective alternative to care home costs or complex extended household arrangements. Our Harrow Borough-approved installers build self-contained annexes from £65,000 with full kitchen and bathroom provision, returning uplifts between £28,000 and £68,000 on 1930s and 1950s housing stock.

0.15

U-value

£28,000–£68,000

Value uplift

25–40 days

Build time

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Garden Annexes in North Harrow

For commuting professionals in North Harrow, creating independent living space for family members, guests, or rental income is a compelling proposition. The area's 1930s and 1950s semis with standard suburban gardens give installers room to work with, and the quiet residential area between Harrow and Pinner setting means builds here tend to enhance rather than overwhelm the streetscape. Our North Harrow projects are specified with full Building Control compliance, kitchen and bathroom plumbing, separate utility connections, and fire-rated construction, and planning under Harrow is well-understood by our vetted installer network.

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 Harrow

North Harrow has no significant conservation area coverage across its main residential streets. Standard Permitted Development rules apply in the London Borough of Harrow.for all builds to protect your investment at resale.

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 North Harrow — 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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