Home Extensions Harrow – Design, Planning Approval & Build
Your trusted partner for home extensions across Harrow, Pinner, Northwood, Stanmore and Edgware (HA3, HA5–HA8 postcodes). We deliver seamless projects with a 100% planning success rate with the London Borough of Harrow.
Home Extensions that grow your home with the family and Harrow requirements.
Families in Harrow, Pinner, Northwood, Stanmore and Edgware love the outstanding schools, green spaces and Met/Jubilee line connections – but many 1930s-1970s houses no longer fit growing or multi-generational households. Instead of moving, many choose to extend. HomeExtensionsRUs specialises in rear extensions, side returns, loft conversions and wrap-arounds perfectly suited to the HA3, HA5, HA6, HA7 and HA8 areas.
Recent projects in the Harrow area
These are recent projects we’ve completed across HA postcodes, focusing on meeting the family needs.
- Single-storey rear extension, HA3 – open-plan kitchen-family room for a 1930s semi (2024)
- Loft conversion with rear dormer, HA5 Pinner – master suite + home office (2024)
- Two-storey side extension, HA7 Stanmore – extra bedrooms and enlarged living space (2023)
- Wrap-around extension, HA8 Edgware – combined side + rear for a detached property (2023)
30 years of extending homes across Harrow has refined our full-service extension approach – achieving 100% planning approval and delivering the quality, communication and project certainty that local families value.
Serving Harrow Families and Homeowners
Our Harrow team delivers high-quality home extensions designed to maximise space, improve flow, and add long-term value to your property. Our construction management service brings your vision to life with 30 years of local experience—coordinating single-storey extensions, open-plan remodels, and full structural reconfiguration from groundworks through final finishes.
We understand that family needs evolve – young children need play space, teenagers want independence, elderly parents require accessible ground-floor living, or working from home demands dedicated office areas. By listening carefully to how your household is changing, we design and build extensions that grow with you, creating flexible spaces that serve you well today and adapt as your family’s needs shift over the coming years.
Planning Permission for Home Extensions in Harrow (HA3, HA5–HA8)
All HA3, HA5, HA6, HA7 and HA8 postcodes fall under the London Borough of Harrow. The council is generally supportive of well-designed householder extensions.
Permitted Development rights are largely intact outside a handful of small conservation areas (e.g. Harrow on the Hill, Pinner Village). Single-storey rear extensions up to 8 m (with Prior Approval) or 6 m (standard PD) are normally allowed without full planning.
We still recommend a pre-app for anything two-storey or near a boundary – our local relationships deliver 100% approval and decisions typically within 6–8 weeks.
Why Harrow-Area Families Partner with HomeExtensionsRUs
We know every Harrow ward, the conservation area guidelines and the exact design cues that win approval first time. Our 100% planning success rate over three years comes from local expertise and clear communication.
You get one dedicated manager from concept to completion — no stress, just the extra space your family deserves.
Home Extension Design
Transform your vision into a practical and stunning home extension plan — tailored to your lifestyle and property.
Council Planning Approval
Navigate planning requirements with our 100% success rate. We handle applications with precision and empathy.
Build Project Management
Ensure your project is delivered on time, on budget, and to the highest standard with our expert oversight.
Ready to Add Space to Your Harrow-Area Home?
Book your free consultation today and discover what’s possible under Harrow’s rules.
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Frequently Asked Questions – Home Extensions in Harrow Area
Do most HA3–HA8 properties need planning permission for a rear extension?
Usually no – Permitted Development rights are generous across Harrow. Single-storey rear extensions up to 8 m (with Prior Approval) or 6 m (standard PD) are normally allowed.
How long does planning take with Harrow Council?
Householder applications are typically decided in 6-8 weeks – often faster with our pre-submission checks.
Can I extend in a Harrow Conservation Area (e.g. Pinner Village or Harrow on the Hill)?
Yes – we regularly secure approval using sympathetic materials and designs that satisfy Harrow’s conservation officers.
Do you handle Listed Buildings in the area?
Absolutely – we’ve successfully extended several Grade II properties in Pinner and Harrow on the Hill.
How much does a typical single-storey extension cost in the Harrow area in 2025?
Expect £62,000–£85,000 including VAT, fees and fittings – our feasibility study gives you a precise figure.
Useful Local Planning & Building Resources – Harrow
- London Borough of Harrow – Planning Applications
- London Borough of Harrow – Conservation Areas
- Planning Portal – Permitted Development Guide
- LABC Front Door – Home Improvement Advice
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