23 Hermitage Downs, Rathfarnham, Dublin, D16X2AO

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• Garden room and granny flat planning permission — the 2026 Class 1A and 3A exemptionsDublin councils granted 89% of the 911 garden-room and granny-flat applications lodged in the two years to September 2026. Since 27 July 2026 a detached 32–45 m² garden dwelling can be exempt, with a 14-day notice to the council.
• Further information requests on a planning application — 21% of Dublin files, six months to reply21% of applications received by Dublin councils in the year to September 2026 drew a further information request. What the council is asking, the six-month deadline, what "significant" FI triggers, and what it does to neighbours' rights.
• An Bord Pleanála appeal, now An Coimisiún Pleanála — four weeks, €220, and a 25% reversal rateThe Commission reversed the council in 25% of the 1,195 Dublin-area appeals decided in the two years to September 2026. Who can appeal, the four weeks, the €220 fee, why 240 appeals a year fail on procedure, and the odds by direction.
• Certificate of compliance with planning permission — what the architect's opinion covers and what it does notRetention applications were 17% of everything lodged in the GDA over 12 months, and a fifth of those decided were refused. What a certificate or opinion on compliance with planning permission says, who signs it, the Law Society and RIAI forms, and the gaps a buyer should close from the register.