What sets us apart
Complete in-house project management
Our team coordinates all trades and administrative requirements internally to ensure a smooth construction process.
Symphony kitchen showroom available
View a range of durable Symphony kitchens at the local showroom for inspiration and design.
Federation of Small Businesses member
Membership signifies a commitment to professional standards and reliable service within the UK building industry.
Expand your home with confidence
B H I Building Services delivers a full range of house extension services in Portsmouth, Chichester, Hampshire, and beyond, guiding you from the first ideas right through to the finishing touches. With 37 years of experience, we manage every step, including planning, permissions, construction, and interior design, so you avoid the stress and get exactly what you want. Our team provides a binding quotation before construction begins, so everything is clear from the outset.
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We handle all the details, from kitchen extensions to double-storey builds, ensuring your new space blends seamlessly with your home. Every project is completed in line with current regulations and is inspected by a Local Council inspector upon completion. We also provide all relevant gas and electricity safety certification where required. You gain extra space and real value, without the hassle of moving.


​Tailored extensions, start to finish
We specialise in single-storey extensions, double-storey extensions, rear and side return extensions, kitchen extensions, and open-plan living spaces. Our service also covers structural alterations and steelwork, as well as foundations, brickwork, roofing, plumbing, electrics, plastering, and full finishing work. Our in-house architectural and design support helps create tailored plans that suit your lifestyle and your property’s character. We guide you through planning permission and building regulations, ensuring every stage is properly managed and approved.
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You receive regular updates and clear communication throughout the build, with a fully managed service from concept through to completion. By using our own experienced team of tradespeople, we maintain consistent quality and ensure your extension is delivered efficiently and to a high standard.
The benefits of extending your home
A well-designed extension allows you to increase living space without the need to move, making your home more practical and enjoyable for everyday life. It also adds value to your property when designed and built correctly. We create tailored designs to suit your home and lifestyle, ensuring seamless integration with your existing property, so the finished result feels natural and cohesive.
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Our fully managed service covers everything from initial concept through to completion, including all planning, construction, and finishing works. With high-quality workmanship and attention to detail throughout, B H I Building Services ensures your extension is built to last, delivering both comfort and long-term value.

