gilston road

This challenging project involves the construction of a new basement structure beneath the garden of an existing residential property. The subterranean space is designed as an extension to the main house, seamlessly linked via a newly constructed tunnel. The new underground area will be utilized for recreational purposes, featuring a home cinema and a gym.  The basement extends beneath the entire garden, with careful planning to ensure minimal impact on the structural integrity of the existing main house. This construction process required extensive excavation and the installation of advanced structural support systems to prevent soil movement and guarantee the stability of the surrounding buildings.  A Contiguous Bored Pile (CBP) retaining wall system was employed to form the external perimeter of the basement. The piles serve as the primary load-bearing structure, effectively resisting both soil and hydrostatic pressures. To manage groundwater ingress, the basement walls were designed to include a waterproofing membrane or grout injection.  A strategically designed connecting tunnel was constructed between the newly formed basement and the existing main house. This tunnel serves as the main access route between the new underground space and the residence, requiring a temporary support system during excavation. The tunnel design considered both structural loads from above and lateral earth pressures, necessitating careful engineering of the tunnel's lining and surrounding soil stabilisation.  The internal space of the basement has been thoughtfully divided into a home cinema and gym. Both areas have been designed with consideration for soundproofing and vibration isolation, particularly for the cinema space, ensuring a comfortable and enjoyable recreational experience.