Planning Permission for Garden Buildings in Northern Ireland

Planning Permission controls whether you can build it there at all (height, position, use). Building Regulations control how you build it (structural safety, insulation, fire safety). They are separate systems. Planning permitted development is set by Class D of the Planning (General Permitted Development) Order (Northern Ireland) 2015, which has no floor-area limit. The 30m² and 15m² thresholds come from Schedule 2 of the Building Regulations (Northern Ireland) 2012: up to 30m² with no sleeping accommodation is exempt if built substantially of non-combustible material or at least 1m from the house, any road and the boundary; up to 15m² with no sleeping accommodation only needs to be at least 1m from a dwelling. You might need one, both, or neither. Electrical work should always be done by a qualified electrician.

No. Garden rooms approved under permitted development cannot be used as separate dwellings. They must be "incidental" to the main house (e.g., home office, gym, studio). If you want to create a separate dwelling (granny flat, rental unit), you'll need full planning permission. Any sleeping accommodation also means the building is no longer exempt from the Building Regulations.

Neighbour objections don't automatically mean refusal. The council considers whether objections are based on valid planning concerns (loss of light, overlooking, size) vs personal preferences. Most garden building applications are approved even with objections, as long as they meet planning rules. Good design and thoughtful positioning help.

Size of garden affects permitted development. All outbuildings together can't cover more than 50% of your garden area (excluding the original house footprint). So larger gardens allow larger buildings without permission. However, the 4m height limit, the 2.5m eaves limit within 2m of the boundary, and the ban on decking or raised platforms still apply regardless of garden size. In an AONB, buildings more than 20m from the house cannot cover more than 10m² in total.

Often yes, for planning. NI permitted development has no minimum boundary distance, but within 2 metres of the boundary the eaves must be no higher than 2.5 metres, and if a road runs opposite the rear wall of your house you must stay 3.5 metres from that boundary. Building control is separate: a building over 15m² (up to 30m²) is only exempt from the Building Regulations if it is at least 1 metre from the boundary or built substantially of non-combustible material. Leaving a gap also helps with maintenance access.

Building without required permission is a planning breach. The council can issue an enforcement notice requiring you to remove the building or apply for retrospective permission. For building work, enforcement can be taken within 5 years of the work being substantially completed (Planning Act (Northern Ireland) 2011, section 132). Works to listed buildings fall under separate listed building controls. Always check first - it's much easier and cheaper than dealing with enforcement action.

You don't need planning permission for electrical work. All electrical work should be done by a qualified electrician and certified on completion. We work with certified electricians and can arrange this as part of your installation.