Awaiting decisionExtensionDecision due in ~7 weeks (7 September 2026)

42, Sycamore Road, Mount Merrion, Blackrock, Co. Dublin, A94Y1T0

Renovation and extension of a semi-detached house in Mount Merrion.

D26B/0401/WEB · Dun Laoghaire Rathdown County Council · Lodged 14 July 2026

Reference: D26B/0401/WEB
Authority: Dun Laoghaire Rathdown County Council
Register status: In progress
Type: Permission
Received: 14 July 2026

Summary

AI-generated

The development consists of the renovation and extension of an existing two-storey semi-detached house. It includes the demolition of a single-storey rear extension, construction of a new single-storey rear extension, conversion of the existing garage, and internal modifications.

Extensionextensionrenovationgarage conversion

Storeys: 2

Generated from the description above by an AI model and may contain mistakes. The council’s description is the authoritative record.

Official record

Development description

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.

Built & sold

What happened next

Beyond the decision: whether this development was built, and what property here has sold for.

Recent sales nearby

within 500 m

Residential Property Price Register sales within 500 metres of this site
Address	Date	Price	Distance
29 Sycamore Road, Mount Merrion, Co Dublin	Sept 2025	€1,785,000	106 m
117 The Rise, Mount Merrion, Dublin	Mar 2025	€1,701,001	194 m
4 Dualla Court, Stillorgan Rd, Stillorgan	Jan 2025	€485,000	227 m
56 Trees Rd, Mount Merrion, Blackrock	Apr 2025	€1,285,000	264 m
31 Trees Rd, Mount Merrion, Blackrock	Nov 2025	€1,740,000	267 m
Apt 6, Fortwilliam, Mount Merrion Ave	Jun 2025	€460,000	272 m
30 Treesdale, Stillorgan Rd, Stillorgan	Oct 2025	€985,000	282 m
2 Cherrygarth, Mount Merrionprice excludes VAT	Oct 2025	€881,057	302 m

Nearby properties, not this site — a guide to local values.

Sources: Building Control Management System (commencement notices) and the Residential Property Price Register, licensed under CC BY 4.0. Records are matched to this application by location and may not be exhaustive; always confirm against the official source before relying on them.

Key dates

Timeline

Application received14 July 2026
Decision due7 September 2026

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