Does an attic conversion need planning permission?

Usually no, most attic conversions are 'exempted development' if under 40 sqm. But a dormer to the front of the house, or conversions in apartments, DO need planning. Check with your local authority or an architect.

How long does an attic conversion take?

A standard bedroom conversion takes 4-6 weeks. With en suite, 6-8 weeks. A dormer extension can take 8-12 weeks. Weather can affect the timeline since the roof is opened up.

Will it add value to my house?

Yes, an attic conversion typically adds 10-15% to your property value. A 3-bed semi becomes a 4-bed semi, which is a significant price bracket jump in most Irish housing markets.

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Attic Conversion Cost Ireland 2026: Pricing Guide

Attic Conversion Cost Ireland 2026: Storage/utility room €10,000 to €15,000. Bedroom conversion €15,000 to €25,000. Bedroom with en suite €22,000 to €35,000. Dormer extension add €5,000 to €15,000. Approximately €1,000 to €1,500 per sqm. Most attic conversions exempt from planning permission under 40 sqm. Must comply with Building Regulations Parts A, B, C, F, K, and L. Structural engineer report recommended.

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