Slievethoul, Brittas, Co. Dublin.

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• Granny flat planning permission in Ireland — the family-flat condition and the 2026 exemptionDublin councils granted 102 of the 122 granny-flat and family-flat applications they decided in the 12 months to September 2026. When an attached flat needs permission, what Class 3A exempts from 27 July 2026, and the condition every grant carries.
• 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.
• 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.