SD25B/0216

Proposed dormer roof to the rear roof slope at existing attic level plus two number velux roof lights to the front roof slope plus first floor front extension over existing ground floor extension also two box style windows at first floor level located on existing side gable plus alterations to existing ground floor rear extension to consist of change of roof style from gable roof to flat roof and all associated site works.

Granted

Core Planning Reasoning

The Inspector recommended retaining Condition 2, which omits the proposed raising and changing of the roof profile on the rear ground floor extension, to prevent overshadowing and injury to the residential amenities of the adjacent property.

Decision Maker's Conclusion

  • The proposed flat roof with parapet would be approximately 100mm higher than the existing ridge and is likely to result in increased overshadowing of the neighbor's kitchen window.
  • Analysis using the 45-degree rule confirms that the adjacent property's window falls within the zone of potential light reduction, and no shadow study was provided to refute this.
  • The Planning Authority's decision to omit this specific part of the development via Condition 2 is warranted to protect the residential amenities of the adjoining dwelling.

Cited Policies (CDP)

Policy H14H14 Objective 1Section 3.1.7 Built Form Principle (BFP) 1Section 3.2.2 Built Form Principle (BFP) 2Section 3.5.2 Built Form Principle (BFP) 5Section 3.7.2 Built Form Principle (BFP) 7South Dublin County Development Plan 2022-2028SDCC House Extension Design Guide 2025

Decision Document Summary

The application concerns various domestic extensions at 2A Kiltipper Close, an end-of-terrace dwelling in Tallaght. While South Dublin County Council granted permission, they included Condition 2 requiring the omission of a proposed change from a pitched roof to a higher flat roof with a parapet on the rear ground floor extension. The applicant appealed this condition, arguing that the new design would remove existing overhangs and that heights were within exempted development norms. However, th...
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