Basement Impact Assessments
Due to high land values and limited development space in London, basement extensions are becoming common. It is increasingly recognised that these may have an impact on local flooding, groundwater flow, and ground movements, potentially generating long term stability issues for neighbouring properties. In April 2011, the London Borough of Camden adopted CPG4, as official planning guidance, for their use in the consideration of planning applications involving basements in the Borough The document presents a structured, formalised approach to identifying the potential risks, both from and to the development, in a five stage Basement Impact Assessment (BIA) process from original screening by the applicant through to review and decision making by the Council.
The BIA process incorporates a holistic review of ...
The BIA process incorporates a holistic review of surface and groundwater conditions, and incorporates geotechnical analysis, where appropriate, to establish ground movements arising from the basement development and therefore its potential impact on neighbouring properties. This is particularly relevant where party wall foundations are to be underpinned. CGL has undertaken a number of BIA reports to date and one of the very first ‘test’ cases of the new process is currently under consideration within the Council.
Recent experience suggests that other London Boroughs are likely to adopt the BIA methodology with frequent requests from Local Planning Authorities to assess the hydrogeological and hydrological impacts of large basements elsewhere in London. CGL’s extensive experience within the London area makes us well placed to address these queries, and provide an holistic analysis to accurately determine the potential risks and support the planning process.
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