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Wide view of a modern brick house extension in Portsmouth featuring a flat roof and large bi-fold doors

House extensions serving Portsmouth, Drayton and across Hampshire

All trades under one roof. Free home surveys and quotations. In-house architectural design team.

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.

A landscaped residential patio area with modern wicker garden furniture outside a newly built brick home extension
Close-up of a contemporary brick extension with large glass sliding doors
- Muhammad Saeed, Google
I can confirm that BHI is the best house-building company I have dealt with. I fully renovated my kitchen with them, which they have transformed into a dream kitchen with all finishing and materials of excellent standards and uncompromising quality. All their team is really professional, friendly, easily approachable, knowledgeable, reliable, hardworking going extra mile to get the job done to excellent standards. They diagnose and resolve any issues accurately and immaculately. They do as they say, and you can blindly trust and rely on their standard of work. The top quality of their work is not comparable to that of any other company. My kitchen now looks like a kitchen in a Palace. I will get all my future projects for my house from them. Their after-sales/ work service is excellent, even coming out of hours to sort any issues. They have highly skilled specialists in Plumbing, gas work, waterworks, and electrical works, and they get the job done to the highest satisfaction and standards, attending to the finest details, and in the end, you can’t find a single fault. After using their services, I can’t think of any other company to use for all my house care projects. I will recommend them 100 per cent for any home care projects and can guarantee the top quality standard they maintain throughout their work. I will post pictures of my kitchen in due course. My review is without any exaggeration, and their way of renovation is such that they don’t cause any disturbance to households. In short, it’s an excellent company to blindly rely on for any home-building work. The top quality standard of their showroom, especially the kitchen, is the real transformation they do in your home. I can use and think of the best words to stamp the highest quality of work that their team delivers. From start to beginning they deliver so smoothly the excellent standards, and it seems all their team like a family.

​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.

Time to add space and value?

Talk with us to book your free survey for house extensions.

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