GrantedAlterationsDecided 31 March 2021

Merrion House, Mount Merrion Avenue, Blackrock, Co Dublin

Alterations and roof extension to a detached house in Blackrock.

D21A/0116 · Dun Laoghaire Rathdown County Council · Lodged 12 February 2021

Reference: D21A/0116
Authority: Dun Laoghaire Rathdown County Council
Register status: Decided
Type: Permission
Received: 12 February 2021

Summary

AI-generated

The project involves altering a detached dwelling to increase it from four to five bedrooms. Works include removing existing ground floor extensions, raising the roof ridge height, and installing a new flat roof and glazed elements.

Alterationsrenovationroof extension

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

Permission sought for the alteration of an existing 4 bed detached dwelling to a 5 bed detached dwelling consisting of; (i) removal of side and rear ground floor extensions, (ii) replacement of existing ground floor pitched roof with new flat roof over side extension (iv) raising of existing roof ridge height (v) new elevational treatment to all elevations including new glazed elements and new render finish throughout (vi) minor internal alterations, together with minor landscaping and bounda...

Land-use zoning

What this land is zoned for

Objective ARS

“A To provide residential development and improve residential amenity while protecting the existing residential amenities”

Objective set by the COUNTY DEVELOPMENT PLAN 2022-2028 (2022–2028). The planning authority decides each application on its own merits — this is the zoning context, not a compliance assessment.

Read the zoning objectives in the development plan

Built & sold

What happened next

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

Built — construction complete

A commencement notice records works starting on 28 February 2023.

Notified floor area: 13 m²

Recent sales nearby

within 500 m

Residential Property Price Register sales within 500 metres of this site
Address	Date	Price	Distance
95 Merrion Park, Blackrock, Co. Dublin	Sept 2025	€1,120,000	51 m
87 Merrion Park, Hill Ave South, Blackrock	Dec 2025	€840,000	62 m
79 Merrion Park, Blackrock, Co Dublin	Nov 2025	€1,330,000	78 m
26 Ashurst, Mount Merrion Ave, Blackrock	Aug 2025	€510,500	86 m
78 Merrion Park, Booterstown, Blackrock	Feb 2025	€920,000	94 m
28 Merrion Hall, Mount Merrion Ave, Blackrock	Feb 2025	€600,000	135 m
Apt 6, Fortwilliam, Mount Merrion Ave	Jun 2025	€460,000	143 m
57 Merrion Park, Blackrock, Dublin	Apr 2025	€760,000	179 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 received12 February 2021
Decision issued31 March 2021

In the area

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Related developments

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