House Extensions Chelsea

Extending a Chelsea property requires a blend of architectural ambition and heritage sensitivity. Whether you are adding a rear extension to a townhouse, building a glazed garden room, or converting a basement to create additional living space, every Chelsea extension project must be designed to complement the area's distinguished architectural character. GS Renovation brings over 30 years of extension experience to Chelsea, delivering projects that add valuable space while respecting the streetscape and conservation area requirements.

Chelsea's strict planning environment — governed by the Royal Borough of Kensington and Chelsea — means that extensions must be carefully designed to meet conservation area policies and, where applicable, listed building regulations. Our team has extensive experience working within these constraints, producing extension designs that satisfy planning officers while achieving our clients' ambitions for additional space, natural light, and improved connectivity between the house and garden.

Our Chelsea extension projects range from discreet single-storey rear additions with frameless glazing and green roofs to more substantial double-storey extensions and basement excavations. Every project is managed end-to-end by our dedicated team, from initial feasibility assessment through planning, construction, and final handover.

Rear Extensions

Rear extensions in Chelsea typically serve to enlarge kitchen and dining areas at garden level, creating the light-filled, connected living spaces that are essential in premium London homes. We design and build extensions that maximise the relationship between interior and garden, using frameless glazing, bi-fold doors, and roof lanterns to create spaces that feel both expansive and intimate.

• Garden-level kitchen extensions
• Frameless glazing and crittal-style doors
• Green roof and living wall integration
• Roof lanterns and clerestory windows
• Seamless indoor-outdoor connection

Side Return Extensions

Where Chelsea properties have a side passage or lightwell, a side return extension can significantly increase the width and usability of ground-floor rooms. We design these extensions to blend seamlessly with the existing building, using materials and proportions that complement the period architecture. Combined with internal wall removal and RSJ installation, a side return extension can transform a narrow Chelsea kitchen into a generous open-plan space.

• Side return infill extensions
• Lightwell widening and improvement
• Combined side and rear extensions
• RSJ installation for open-plan layouts
• Period-sympathetic materials and detailing

Planning & Building Regulations

Extensions in Chelsea are subject to rigorous scrutiny from the Royal Borough's planning department. Our team prepares thorough planning applications with detailed drawings, design and access statements, and heritage impact assessments where required. We manage the building control process throughout, ensuring your extension is fully compliant and properly certified.

• RBKC planning application preparation
• Conservation area compliance
• Listed building consent where required
• Building control management
• Party wall agreement coordination