Hillside Lodge, Kilmashogue, Rathfarnham, Dublin 14

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• Retention planning permission in Ireland — refused 27% of the time, against 7% for extensionsOne in six Dublin applications is for retention, and 27% of retention decisions in the two years to September 2026 were refusals. When you need it, the treble fee, the seven-year rule and the sale-time problem.
• 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 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.
• Planning permission vs exempted development — 29% of section 5 requests came back "not exempt"Of 251 section 5 declarations decided by Dún Laoghaire-Rathdown and South Dublin in the 12 months to September 2026, 29% found the works needed permission. How exemption works, where it is lost, and how to get a €80 declaration.