Transform Your Home with a Bespoke Extension
An extension is one of the most effective ways to create more space and add significant value to your property. At Gosai Construction, we design and deliver extensions tailored to your lifestyle — blending functionality, style, and craftsmanship across London and Greater London.
Designed Around You
Every home is unique, and so are our extensions. Whether you’re looking to expand your kitchen into a bright, open-plan area, add extra bedrooms for a growing family, or create a home office sanctuary, we guide you from initial design through to final build. Our architects and designers work with you to ensure your extension integrates seamlessly with your home’s style, scale, and setting.
Why Choose an Extension with Gosai?
- Add valuable living space without leaving the home you love
- Increase property value with a high-quality build
- Options including side-return, rear, wrap-around, single or double-storey extensions
- Full support with planning permissions, building regulations, and council approvals
- Delivered on time, on budget, and with precision craftsmanship
Built to Last
It’s not enough to build large — it must endure. We use premium materials, expert engineering, and meticulous attention to detail, from foundations through to finishing touches. With over 30 years of experience, we ensure each extension is solid, safe, and suited to London’s climate and regulations.
Frequently asked questions
How much value does an extension add to my London home?
A well-designed and built extension can add anywhere from 10–20% (or more) to your property value, depending on location, materials, and scale.
Do I need planning permission for an extension?
Many smaller extensions fall under permitted development, but for larger builds, or in conservation / listed areas, full planning permission may be required. We handle the applications for you.
How long will the extension process take?
Typically 10–16 weeks, depending on the size, complexity, ground conditions, and required approvals. Before work begins we’ll provide a detailed timeline.
What level of disruption should I expect?
Some disruption is inevitable, but we minimise it: daily cleanup, clear schedules, protected worksites. We aim to make the process as smooth as possible.
What distinguishes Gosai from other builders for extensions?
Our combination of aesthetic design, solid technical expertise, full compliance, and commitment to deadlines and quality gives homeowners confidence in every project.
Explore our portfolio of Extension projects
Each project was crafted with precision, creativity, and a commitment to exceptional quality. From the design to the hand over phase.
