Expert house extensions and loft conversions across London. More space, more comfort, more value — built to last.
Extensions
Since 1998, Hennessy Ltd has helped London homeowners transform cramped houses into spacious homes. Dream kitchen, extra bedroom, home office — whatever you need, we design and build bespoke extensions and loft conversions that maximise space, boost functionality, and add serious value to your property.
Our Extension Services
Tailored solutions built to transform how you live:
House Extensions: Single-storey rear extensions, double-storey side additions — seamlessly built to match your home’s style. Perfect for open-plan living, extra bedrooms, or a standout entertainment space.
Loft Conversions: Turn wasted attic space into a stunning master suite, home office, or playroom. Dormer, mansard, or Velux — built around exactly what you need.
Full Project Management: Design, planning permission, construction, finishing touches — we handle it all, start to finish, hassle-free.
More Space. More Value.
Every square metre counts. Our extensions and loft conversions are designed to make the most of your space — practical, stylish, and built around how you live. And because a bigger home is a smarter investment, you’re adding real value along the way. We work closely with you at every step, so the finished space matches your vision and our standard of craftsmanship.
See the transformation for yourself. From cramped attics turned luxurious bedrooms to compact homes opened up with modern extensions — our portfolio speaks for itself.