London’s limited living space can be a challenge to get around, but instead of moving we encourage considering plans to extend your existing home. A basement extension can be filled with light and heat when given the correct initial planning. We have experience in basement excavation, basement conversions and basement construction.

Our new basement are completely waterproof and damp free. We offer to build new basement or full renovations of the existing basement including lower floor level and full tanking installation. We use for tanking only the best quality products from DELTA membrane system LTD. For more information or to borrow some materials please click here.

Our basements works are fully completed with DELTA design and inspections. On the completion we provide 30 years product guarantee.


Our highly personalised service will ensure that your underground extension fits your needs perfectly. HBC can help turn your ideas of more living space into a reality with a basement, loft or general extension. To understand how to best use your existing properties space, please contact us here.