House Extensions & Construction Services in London

​With over 20 years in the building industry and countless extensions and conversions completed, G3 Building Solutions delivers construction projects of every scale across Central London. From single-storey rear extensions to loft conversions and full structural alterations, our experienced team manages every stage from groundworks to final finishes.

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House Extensions

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Extensions are the most cost-effective way to add space and value to your property. We design and build rear extensions, side return extensions, wraparound extensions and double-storey extensions, handling planning applications, structural engineering and building control sign-off as part of one seamless service. Our in-house architectural support means we can take your project from initial sketches to completed build.

 

Loft Conversions

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A well-executed loft conversion can add significant value to your home and create the extra bedroom, office or living space you need. We carry out dormer, hip-to-gable, mansard and velux loft conversions, including all structural steelwork, insulation, plastering, electrics and plumbing. Having our trades in-house means fewer delays and a cleaner build.

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Structural Alterations

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Whether you need load-bearing walls removed to create open-plan living, steel beams installed, or internal layouts completely reconfigured, our team delivers structural work safely and to current building regulations. We coordinate with structural engineers and building control throughout to ensure full compliance and sign-off.

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New Builds

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From ground-up residential builds to commercial units, we manage the full construction process. Our experience across Central London means we understand the particular constraints of urban building — restricted access, party wall considerations, planning conditions and working within tight sites.

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Our Approach

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We provide a design-and-build service under one roof. From initial planning submissions and architectural drawings through to the final build, you deal with one team throughout. This reduces miscommunication, avoids costly changes mid-project, and keeps everything on track and on budget.