Renovation and extension of existing 2-storey semi-detached house at 42, Sycamore Road
42, Sycamore Road, Mount Merrion, Blackrock, Co. Dublin, A94Y1T0
up to 2 storeys · 0.048 ha · Granted · permission to Sept 2031 (estimate)
Planning application D26B/0401/WEB to Dun Laoghaire Rathdown County Council: Renovation and extension of existing 2-storey semi-detached house to include, demolition of single-storey rear extension, at 42, Sycamore Road, Mount Merrion. Granted by the council on 4 September 2026. The permission normally runs to September 2031 (an estimate: the grant plus five years).
Timeline
- Application lodged
- Council granted
- Permission normally ends (estimate)
The end date is an estimate: the grant plus five years, the normal life of a permission. An extension or a commencement changes it.
Key facts
Proposed development
The development will consist of the renovation and extension of existing 2-storey semi-detached house to include (i) demolition of single-storey rear extension, (ii) construction of a new single-storey part-pitched roof, part-flat extension to rear with rooflights (iii) conversion of existing garage and modifications to existing garage doors to front (iv) demolition of chimneystack to rear, new rooflight to side, external insulation to rear and internal modifications to the existing house, (v) landscaping works to the rear and associated site works.
Planning status
Permission was granted on 4 Sept 2026. The four-week appeal period has passed with no appeal recorded, so the permission is final. Works can start once a commencement notice is lodged; the permission normally runs to Sept 2031 (estimate).
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Nearby applications
Other applications on the Dun Laoghaire Rathdown register close to this address.
- D26B/0099/WEB38, Stillorgan Road, Blackrock, Dublin, A94A2W2Granted
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- D25A/0121/WEB51, Sycamore Road, Mount Merrion, Blackrock, Dublin, A94K8X7On Site
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- D24A/0937/WEB8, Sycamore Crescent, Mount Merrion, Blackrock, Co. Dublin, A94H9P0Granted
The proposed extension to the side and rear of the house consists of a part 2-st
- D25B/0727/WEBThe Gables, Sycamore Crescent, Mount Merrion, Dublin, A94Y8D2On Site
(i) Construct a two storey East facing side and front ex
- D26A/0327/WEB100, The Rise, Mount Merrion, Co Dublin, A94N7Y3Closed
1) Demolition to existing Chimney to the rear, 2) Proposed two story extension t
- D26A/0346/WEB100, The Rise, Mount Merrion, Blackrock, Co. Dublin, A94N7Y3Granted
1) Demolition to existing Chimney to the rear, 2) Proposed two story extension to the rear with pitched roof also a single story extension with pitched roof…
Related
About this page: the facts above come from the statutory public planning register kept by Dun Laoghaire Rathdown County Council and are refreshed weekly (last updated 28 Sept 2026). Applicant names and contact details are not shown. Status labels are PlanningLeads' plain-language reading of the register status and the "Use" label is classified by AI from the public description (see how we use AI); neither is legal advice and the council's file is the record. How we handle this data: privacy notice.
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