26 Mather Road South, Mount Merrion, Blackrock, Co. Dublin, A94F7K2

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• Planning permission for an extension in Ireland — the 45 m² exemption and a 94% grant rateDublin councils granted 94% of extension applications decided in the year to September 2026. Since 27 July 2026 a rear extension of up to 45 m² can be exempt. The conditions, when you still apply, the fee and the timeline.
• How to object to a planning application in Ireland — five weeks, €20, and 348 open windows today348 Dublin-area applications are inside their five-week observation window as this page was built. Anyone can make a submission for €20. Since the 2024 Act it is also the ticket to an appeal and, for most people, to judicial review.
• Site notice planning rules — 22% of Dublin applications invalid, and the notice is the top cause2,539 of the 11,409 applications received by Dublin councils in the year to September 2026 were declared invalid; in South Dublin nearly half were for the site notice. What it must say, where it goes, when it turns yellow.
• How long does planning permission take in Ireland? A 53-day median, and the tailThe median Dublin application took 53 days from receipt to decision in the year to September 2026; one in ten took over 161 days. The eight-week clock, what stops it, and what "final grant" means.