21 South Avenue, Mount Merrion, Co. Dublin

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• Planning application fees and costs in Ireland — €34 for an extension, €65 for a house, treble for retentionThe council fee is the smallest cost of a planning application. Schedule 9 fees for a house, an extension, retention and commercial floor space; the €20 observation, the €220 appeal, development contributions and what the drawings and notices cost.
• 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.
• Protected structures and architectural conservation areas — what needs permission, the free section 57 declaration, and what the register shows368 applications naming a protected structure were decided across the Greater Dublin councils in 12 months and 88% were granted. What being on the Record of Protected Structures means, what an ACA takes away from the ordinary exemptions, how to get a section 57 declaration, and what buyers should check.