Our team have been assisting with design, method and construction of one, two and three level basements for residential and commercial projects for 20 years, using a range of techniques to complete each project. We have:

• Perfected specialised retention techniques including a steel wall system which is installed without vibration prior to excavation. The system includes the temporary and permanent wall with a very narrow profile and an attractive high spec finish.
• Imported the DRCFA technology halves the standard piling tolerances currently assumed in the industry. The DRCFA system is fast and accurate.
• Completed a number of basements using top down or partial top-down methodologies.
• Constructed several basements using prop and berm techniques.
• Imported German-built leader rigs with high-spec vibro tools allowing variable speed and variable moment adjustments during installation minimising vibration influence away from the site.

The issues and methods to consider when planning a basement development can be many and complex and comprise all or part of the following:

• Feasibility.
• Noise and vibration.
• Traffic management.
• Deflection limits for retaining structures in respect of both compliance and actual site conditions.
• Ground water levels and ground permeability trigger the need to consider drawdown settlement, flooding issues, whether to fully tank, drain or partially drain basements.

“We can provide our clients with a range of costs, depending on strength of the soil and height of the water table and can construct a range of basements from palisade to secant walls – depending on the geology and neighbours. CLL knows basement developments inside-out and advises the best solutions right from an early stage.”
— Terry Donnelly