SD21B/0210

Extension and refurbishment of existing two storey three bedroom semi-detached dwelling of 103sq.m consisting of: new reconfigured vehicular entrance with electric gate and additional permeable paving with new single storey ground floor front; side and rear extension of 44sq.m with lean-to pitched roof and roof lights; detached single storey home office of 11.5sq.m with new rear garden side access from Liffey Crescent with landscaping to remaining 25sq.m garden area; new internal stairs to converted attic store of 24sq.m with dormer window to gable roof and associated site works.

Refused

Core Refusal Reason

The proposal constitutes overdevelopment of a restricted site and poses significant risks to public water and drainage infrastructure due to inadequate setbacks from existing mains.

Decision Maker's Conclusion

  • The proposed development is located too close to a 300mm public surface water sewer and a 100mm public watermain, failing to meet minimum setback requirements and risking structural damage and restricted maintenance access.
  • The scale of the extension combined with a proposed home office results in overdevelopment of the 0.0240-hectare site, leaving insufficient private amenity space for a three-bedroom dwelling.
  • The development would set an undesirable precedent for similar works that are harmful to residential amenities and contrary to the proper planning and sustainable development of the area.

Cited Policies (CDP)

Decision Document Summary

The application proposed an extension and refurbishment of a two-storey semi-detached house at 25 Liffey Dale, Lucan. South Dublin County Council refused permission because the side extension encroached upon the required exclusion zones for both a public surface water sewer and a watermain, posing a threat to public health and infrastructure integrity. Furthermore, the planning authority deemed the proposal an overdevelopment of a constrained site, noting that the resulting 25 sq.m of rear ameni...
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