Tadworth, Surrey
Date:
20211101
Client:
Private
O’Sullivan Civil Engineering constructed a large basement beneath a new rear extension to an existing private residence in Tadworth, Surrey – one of the most technically demanding forms of residential basement construction.
The scope included mass concrete underpinning of the existing house foundations, a timber soldier and waling temporary earthwork support system, bulk excavation in a constrained rear garden, modular steel formwork, steel mesh reinforcement, and a waterproof concrete base slab and retaining walls. The sequence concluded with a reinforced ground floor slab poured over the completed basement structure.
This project demonstrates O’Sullivan’s capability in complex underpinning and basement construction for private residential clients, architects and structural engineers across Surrey and the wider South East.
Controlled excavation adjacent to existing residential property using temporary earthwork support system - basement extension, Tadworth, Surrey 
Timber soldier and waling temporary earthwork support system protecting existing foundations during basement excavation - private residential project, Tadworth, Surrey 
Mass concrete underpinning beneath an existing house to facilitate basement construction under a new rear extension -Tadworth, Surrey 
Basement formation and groundworks beneath new residential extension - underpinning and temporary earthwork support, Tadworth, Surrey 
Steel-fixed in-situ reinforced concrete basement retaining walls under construction - residential basement beneath new extension, Tadworth, Surrey 
Modular wall formwork panels and reinforcement installation for waterproof concrete basement walls - private residential project, Tadworth, Surrey 
Completed A393 steel mesh reinforcement for basement roof slab with edge formwork set out ahead of concrete pour - Tadworth, Surrey 
Concrete pour and tamping of ground floor slab over basement - residential underpinning and basement construction, Tadworth, Surrey 
Completed basement structure beneath new residential extension - underpinning, waterproof concrete and formwork works, Tadworth, Surrey
