Harrow grew up along the Metropolitan Railway’s Metro-land suburbs of the 1920s and 1930s, giving the borough its bay-windowed semis in Pinner, Rayners Lane and Wealdstone, alongside the genuinely old hilltop village of Harrow on the Hill wrapped around Harrow School.
What We Do
Our Building Services in Harrow
Every service below is delivered by our own in-house tradespeople, fixed-price and fully insured, right across Harrow.
Loft Conversions in Harrow
Dormer, mansard, hip-to-gable and Velux loft conversions across London, built to a fixed price and full Building Control sign-off.
Learn more →House Extensions in Harrow
Rear, side return, wraparound and double storey extensions designed and built to fit seamlessly with your London home.
Learn more →Basement Conversions in Harrow
Cellar conversions, basement lowering and full new excavations, engineered and waterproofed to BS 8102 by our in-house team.
Learn more →Garage Conversions in Harrow
Integral, attached and detached garage conversions into bedrooms, offices and annexes, most without planning permission.
Learn more →Property Refurbishment in Harrow
Cosmetic updates through to full structural refurbishments, managed under one dedicated site manager from start to finish.
Learn more →General Building in Harrow
Repointing, roof repairs, damp treatment, brickwork and small structural alterations, carried out by our own trades.
Learn more →Design & Build in Harrow
One team, one contract, one fixed price for design, planning, structural engineering and construction on your project.
Learn more →New Builds in Harrow
New homes and replacement dwellings built from foundation to final finish, with zero-rated VAT on construction costs.
Learn more →Commercial Building in Harrow
Office, retail and restaurant fit-outs across London, delivered around your trading hours with minimal disruption.
Learn more →Residential Building in Harrow
The full range of residential building work, from a single repair to a new build, delivered by one London contractor.
Learn more →Building Demolition in Harrow
Safe, fully licensed demolition work across London, from internal wall removal to complete house demolition ahead of a new build.
Learn more →Why Choose Us
Why Choose Us in Harrow
One Site Manager, Start to Finish
You get a single dedicated site manager for the whole of your Harrow project, not a rotating cast of subcontractors passed between agencies.
Fixed-Price Quotes
Every quote is itemised and fixed against a proper site survey, so the price we agree with you in Harrow is the price you actually pay.
Our Own In-House Trades
Bricklayers, carpenters, electricians and plumbers all work for us directly, which is why our schedule holds up on site in Harrow.
Local Planning Knowledge
We know Harrow Council's conservation areas, Article 4 directions and design guidance, so your Harrow project starts on the right planning route.
Local Knowledge
Building & Planning Considerations in Harrow
Harrow has around 30 conservation areas grouped mainly around Harrow on the Hill, Pinner, Stanmore and Harrow Weald, several of which carry their own Article 4 directions. Green Belt land across Stanmore and Harrow Weald restricts disproportionate extensions to the original dwelling, and the council's Residential Design Guide sets out detailed expectations for dormers, rear additions and materials across the rest of the borough's deep-plotted interwar semis.
Every quote we provide for a Harrow property starts with a check against Harrow Council's conservation area maps and Article 4 register, so you know exactly which route your project needs before any design work begins.
Areas We Cover
Areas We Cover in Harrow
Harrow on the Hill
Pinner
Wealdstone
Stanmore
Rayners Lane
Kenton
Edgware
Harrow Weald
Don't see your street listed? We cover the whole of Harrow and the surrounding area — get in touch to check.
Our Work
Recent Harrow Projects
A look at recent work carried out for clients in and around Harrow.
Mansard Roof Loft Conversion
An under-used loft transformed into three light-filled bedrooms and a family bathroom, with a full mansard roof extension built to Building Control standards from start to finish.
View Project →
Rear Extension — Open-Plan Kitchen & Living Space
A single-storey rear extension that opened up a cramped, closed-off floor plan into one bright, open-plan kitchen and living space.
View Project →What Clients Say
Reviews from Harrow
“Alpha converted our loft into two bedrooms and a bathroom without a single hiccup. They turned up when they said they would, kept the site tidy, and the finish is better than we hoped for.
”
Priya Shah
Loft Conversion, Walthamstow
Common Questions
FAQs for Harrow Homeowners
Which parts of Harrow are best suited to a loft conversion?
The interwar semi-detached houses of Rayners Lane, Kenton and Wealdstone typically have deep hipped roofs that suit a hip-to-gable or dormer loft conversion well, while properties on Harrow on the Hill need a more heritage-sensitive approach given the area's conservation status.
How quickly can you start a project in Harrow?
Once your survey is complete and any required planning approval is granted, most projects in Harrow start on site within 2 to 4 weeks, subject to our current schedule.
Do you handle planning permission and Building Regulations in Harrow?
Yes. We manage the full planning and Building Regulations process for Harrow projects, including liaising with Harrow Council where a planning application is required.
Do I need to get multiple quotes before choosing a builder in Harrow?
It is always sensible to compare quotes, but make sure you are comparing fixed, itemised prices based on a proper site survey rather than rough estimates, since these rarely match the final bill.
Ready When You Are
Get a Quote for Your Harrow Building Project
Free site survey, a fixed-price quote within 48 hours, and one team from first fix to final handover.
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