GSM Builders Ltd are experienced builders in Harrow, working across HA1, HA2 and HA3 – Harrow on the Hill, Harrow Weald, Wealdstone, Kenton, Rayners Lane, North Harrow, Pinner and Stanmore borders. We are based in Hayes, roughly 25 minutes away, and regularly run extension, loft and refurbishment projects across the borough.
Building on Harrow’s mix of housing
Harrow has a wider mix of homes than most West London boroughs: 1930s semis in Kenton and Rayners Lane, large detached Edwardian and inter-war houses around Harrow on the Hill and Harrow Weald, Victorian terraces in Wealdstone, and a growing number of flats around Harrow town centre. Each type calls for a different approach, and we have worked on all of them.
Typical projects include double-storey rear extensions on the larger detached houses, hip-to-gable loft conversions on 1930s semis (which can add a genuine 30 m² of floor space), side-return extensions on Wealdstone terraces, and the complete renovation of period houses – including structural alterations to open up the ground floor.
Planning permission in Harrow
Harrow Council manages planning locally. Harrow on the Hill, Roxeth, Harrow Weald Park and Pinner High Street are among the borough’s conservation areas, where Article 4 directions can remove permitted development rights for extensions and roof alterations. Elsewhere, standard permitted development limits apply. We advise on the right route before you commit, produce the drawings and structural calculations, and submit the application if one is needed. All structural work is inspected and certified by Building Control.
Building services we offer in Harrow
- House extensions – single-storey rear, side-return, wrap-around and double-storey
- Loft conversions – Velux, rear dormer, hip-to-gable and L-shaped
- Full property refurbishment and renovations
- Kitchen fitting and kitchen renovation
- Bathroom renovation and wall tiling
- Roofing, plastering, flooring and painting & decorating
- 24/7 emergency call-outs – plumbing, electrics, glazing and boarding-up
Why choose GSM Builders Ltd in Harrow?
- Genuinely local. Our base at Leven Way, Hayes UB3 is about 25 minutes by road from Harrow, so site visits, quotes and snagging calls are quick and easy.
- One team from start to finish. Design input, structural calculations, Building Control liaison, all trades and decoration under one contract.
- Building Control approved work. Every structural project is signed off with completion certificates you will need when you sell or remortgage.
- Clear written quotes. Itemised pricing, agreed payment stages and no hidden extras.
- Fully insured with public liability cover and a 12-month workmanship warranty.
Examples of work in Harrow
- Two-storey rear extension with new kitchen and master bedroom in Harrow Weald
- Hip-to-gable loft conversion with Juliet balcony in Kenton
- Side-return extension and full ground-floor reconfiguration in Wealdstone
- Kitchen and bathroom renovation of a Rayners Lane semi
Nearby areas we also cover
Ruislip · Greenford & Northolt · Hillingdon · North West London · West London
Free quotes in Harrow
Contact us with your address and what you have in mind. We will arrange a site visit and provide a clear written quote at no cost.
