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WHL S&E

WHL SURVEYING & ENGINEERING CASE STUDY

Structural Appraisal of Carlisle Mansions, Westminster

WHL Surveying & Engineering was instructed to undertake a visual structural appraisal of Carlisle Mansions, a substantial late-Victorian residential mansion block in Westminster, to support the preparation of the Building Safety Case under the Building Safety Act 2022.

Scope of Work

The commission included a comprehensive inspection of the building’s loadbearing masonry structure, foundations, basement, roof, external walls, balconies and communal areas, together with a desktop review of available fire safety, asbestos and historic building information. Particular attention was given to the structural implications of the building’s age, previous flooding, historic alterations and the absence of original structural drawings.

Findings

The appraisal confirmed that Carlisle Mansions remains structurally robust, with its traditional loadbearing brick masonry construction continuing to provide effective vertical and lateral stability. No evidence of significant structural movement, settlement or major alterations affecting the primary structural system was identified. The principal structural risk relates to the building’s below-ground environment, where previous basement flooding, the site’s Flood Zone 3 location and ongoing moisture exposure present long-term durability risks to masonry, timber and concealed metal elements. The inspection also identified areas requiring continued monitoring, including balcony supports and steelwork, where weathering and concealed corrosion could affect long-term performance if left unmanaged.

Recommendations

WHL Surveying & Engineering recommended targeted intrusive investigations to verify concealed structural elements, including foundation construction, timber floor build-ups, embedded steelwork and balcony fixings where original records were unavailable. The report also advised implementing a planned inspection and maintenance regime focusing on basement moisture management, drainage systems, masonry repairs, corrosion protection of external steelwork and regular monitoring of balconies and other attached structures. These measures provide a proportionate strategy to support the Building Safety Case while safeguarding the long-term structural integrity and resilience of this historic residential development.

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