Grandspire Developments is a local building company and trusted builder specialising in house extensions, home renovations, garage conversions, loft conversions and bathroom refurbishments in Brackley, Bicester, Banbury and surrounding areas. We help homeowners create more space, improve layouts and modernise properties with a reliable, end-to-end building service, transparent written quotes and quality workmanship. If you’re searching for builders in Brackley, Bicester or Banbury, our team delivers practical solutions tailored to your home and budget.

Our extension work includes single-storey extensions, double-storey extensions and rear/side extensions, planned to blend with your existing property and finished to a high standard, ready to live in. We also provide loft conversion and garage conversion services to turn unused space into insulated, comfortable rooms such as bedrooms, home offices, gyms or playrooms. Every conversion is completed with careful attention to structure, insulation, ventilation, electrics, plumbing where required, and a clean final finish.

For homeowners planning a bathroom renovation, we deliver full bathroom refurbishments and bathroom installations – from strip-out and first fix to tiling, plastering, fitting and final seal. We coordinate all trades so you don’t have to manage multiple contractors, and we keep the project moving with clear communication and realistic scheduling.

We don’t just “do the build” – we manage your project from start to finish. You’ll have one point of contact, clear written quotations with no hidden extras, and work completed in line with current UK Building Regulations. We also protect your home while we’re on site, organise waste removal, and keep the workspace tidy and safe.

Alongside larger builds, Grandspire Developments offers essential property improvement services including interior and exterior decorating, carpentry and joinery (structural and finishing work), plumbing alterations and repairs, and general property maintenance – either as one-off jobs or as part of a full refurbishment.

Contact Grandspire Developments to arrange a site visit and receive a clear, itemised quote for your extension, loft conversion, garage conversion or bathroom refurbishment.