Our Services
Home Extensions
About This Service
Professional Home Extensions Across Maidenhead, Windsor, Ascot and surrounding areas
Using tracked mini-excavators, telehandlers, site laser levels and our in-house plant hire with trained drivers, Sub Build deliver design-and-build home extensions across Maidenhead, Windsor, Ascot and surrounding areas. We install structural steelwork to British Standards, coordinate architects and building control, and manage every trade from strip-out to finish. With 35 years' local experience we deliver bespoke rear, front, wrap-around and multi-storey extensions that increase usable space and market value.
Our Process
How It Works
Free site survey
We carry out a full site visit, take measured surveys and give free initial indications, then agree a scope before producing a fixed-price quotation.
Design and approvals
In-house project management coordinates architects, planning applications, structural engineers and building control to secure approvals and technical drawings.
Build, manage, complete
We deploy plant, manage subcontractors, schedule inspections and deliver finishes, handing over with certification and a snagging walk-through.
Benefits
Why Choose us for Home Extensions?
End-to-end design and build
Single-point management from concept to completion removes duplication and keeps programmes tight, so architects, engineers and trades work to one delivery plan.
Local expertise and trusted trade memberships
Regional experience, plus memberships of The Guild of Master Craftsmen, the Association of Master Tradesmen and Local Surveys Direct, provide reassurance on compliance and workmanship.
On-site plant to reduce delays
Our plant hire capability with driver options speeds groundworks and deliveries, reducing reliance on third parties and helping keep your project on schedule.
Bespoke extensions for real homes, not cookie-cutter boxes. We design and build rear, front, wrap-around and multi-storey extensions tailored to your plot, whether a Victorian terrace in Maidenhead, a modern detached in Windsor or a riverside property in Marlow. Structural works are installed to British Standards, we use site lasers and precision plant for accurate foundations, and we arrange temporary propping, RSJ installation and damp-proofing as required.
Practical project management: Sub Build coordinate planning applications, building control approvals and the whole supply chain. Our team oversees trades, organises inspections and issues final certificates. We offer free initial indications, follow up with a fixed-price quotation after a full survey, and can supply plant and drivers to keep access and logistics under control on restricted sites.
FAQ
Frequently Asked Questions
Some single-storey rear extensions fall under permitted development, but larger, multi-storey or visible front extensions often require planning permission. Sub Build assess the site, advise on likely outcomes and can prepare drawings and submit applications with your architect if needed.
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