The Department of Housing, Planning, Community and Local Government provide a wide range of guidance on planning related issues including architectural heritage, landscape, childcare facilities and best practice design.
They also provide a range of leaflets covering a wide range of planning topics including how to prepare and lodge a planning application, how to make a planning appeal, requirements for change of use, building extensions, garages, domestic sheds, agricultural development, etc. The full range of these leaflets can be found at: https://www.opr.ie/planning-leaflets/
For further details on planning guidelines and standards please refer to www.environ.ie and www.irishstatutebook.ie