What is retention planning permission in Ireland?

Retention permission is used where development has already taken place without the planning permission it required, or where it deviated materially from a permission that was granted. Rather than only being able to seek forgiveness after the fact through enforcement proceedings, the Planning and Development Act 2000 allows an applicant to seek retention permission, effectively asking the council to grant permission for works as built, assessed under the same planning tests as if the application had been made before construction.

Crucially, retention is not an automatic route to legalising unauthorised works. The council assesses the retention application exactly as it would a standard application - against the local development plan, ministerial guidelines, and the impact on neighbours and the area - and can refuse it if the development does not comply with proper planning and sustainable development. A refusal of retention can lead to enforcement action requiring the unauthorised element to be modified or removed entirely.

The process follows the same statutory steps as a normal application: site notice, newspaper notice, public observation period, and possible third-party appeal to An Coimisiún Pleanála, meaning neighbours can object to retention applications just as they could to a standard proposal. Retention is commonly needed where an extension was built larger than the exempted development limits, where works deviated from an approved planning permission, or where a change of use occurred without permission.