SD21B/0585
Demolition of existing single storey structures; porch to front, bay window and store to rear; construction of single storey flat roof extension to front, part single storey flat roof extension and part two storey extension with pitch roof to match existing dwelling to rear and internal modifications with associated siteworks.
Refused
Core Refusal Reason
The development was refused due to significant flood risk concerns, encroachment on the Whitechurch Stream riparian buffer, and inadequate surface water management and drainage proposals.
Decision Maker's Conclusion
- The proposed extension is situated within a 1 in 100-year flood risk zone, and the proposed mitigation measures, specifically the removal of a weir, are unacceptable as they increase flood risk to downstream properties.
- The development fails to maintain the mandatory 10-metre biodiversity protection zone from the Whitechurch Stream, creating a risk of sediment release and ecological damage to the watercourse.
- The application lacks essential technical data, including soil percolation tests and BRE Digest 365 calculations, and fails to provide adequate Sustainable Drainage Systems (SuDS) to manage surface water run-off.
Cited Policies (CDP)
Policy G3 Objective 2Policy IE3 Objective 3Policy IE2 Objective 5Policy IE2 Objective 9
Decision Document Summary
The proposal involved the demolition of existing single-storey structures and the construction of an extension at Lissadell, Whitechurch Road, Rathfarnham. The site is located adjacent to the Whitechurch Stream, placing the development within a high-risk flood zone. South Dublin County Council refused permission because the applicant failed to demonstrate adequate flood mitigation, proposed an insufficient setback from the watercourse in violation of biodiversity policies, and provided inadequat...SOURCE PDFOpen Original
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