Garden Room in Ireland — Cost, Planning, and When It Beats an Extension

Garden room in Ireland: €8,000–€25,000 installed (typically 10–25 m²). Under 25 m² is exempt from planning (Schedule 2, Class 3 of the Planning Regulations). Over 25 m² needs full planning permission. Uses: home office (most common), gym, playroom, art studio, teenager's retreat, granny flat (with restrictions on overnight use). Cheaper than an extension (€2,500–€3,800/m²) and faster to install (2–4 weeks). Best for sites with a flat garden and a clear sightline to the house. Most modern garden rooms are timber-frame with EWI, double-glazed windows, and a heat pump or electric heater.

TL;DR

• Garden room in Ireland: €8,000–€25,000 installed (typically 10–25 m²). Under 25 m² is exempt from planning.

• Uses: home office, gym, playroom, art studio, teenager's retreat, granny flat (with restrictions).

• Cheaper than an extension (€2,500–€3,800/m²) and faster to install (2–4 weeks). Best for sites with a flat garden and a clear sightline to the house.

When this matters most

You're considering a garden room (home office, gym, etc.).

When this doesn't apply

You've already extended the house.

Frequently asked questions

How much does a garden room cost in Ireland?

€8,000–€25,000 installed (10–25 m²). Under 25 m² is exempt from planning. Most common use: home office. Cheaper than an extension and faster to install.

Do I need planning permission for a garden room in Ireland?

Under 25 m²: exempt from planning (Schedule 2, Class 3). Over 25 m²: full planning permission required. The garden room must be for domestic use, not as a separate dwelling.

What can I use a garden room for?

Home office, gym, playroom, art studio, teenager's retreat, granny flat (with restrictions). Cannot be used as a separate dwelling without change-of-use planning.

Sources

Planning and Development Regulations 2001, Schedule 2, Class 3. https://www.irishstatutebook.ie/