Garden Room Planning Permission: What the 2026 Exemption Changed

Garden room planning permission in Ireland depends on how you use the space. Standard garden rooms for hobbies or home offices up to 25 m² are generally exempt. However, under S.I. No. 340/2026, effective 27 July 2026, detached garden dwellings up to 45 m² used for living are also exempt, provided specific conditions are met.

What is the difference between a garden room and a garden home?

A garden room is a non-habitable space like an office or gym, while a garden home is a fully habitable dwelling designed for full-time living.

Historically, you could build a 25 m² garden room without planning permission, but you could not sleep or live in it. If you wanted to build a space for an elderly parent or an adult child, you needed full planning permission from your local council. The new exemption changes this distinction entirely.

From July 2026, you can build a habitable garden home up to 45 m² without going through the standard planning permission process, provided you follow the strict rules set out in S.I. No. 340/2026. This allows families to create independent living spaces in their back gardens much faster than before.

What are the rules for the 2026 garden dwelling exemption?

To qualify for the planning exemption under S.I. No. 340/2026, your garden dwelling must be under 45 m², located in the rear garden, and leave at least 25 m² of private open space.

The exemption, which currently runs until 31 December 2030, has specific conditions to prevent overdevelopment in residential areas. You must meet all of the following criteria to build without planning permission:

• The unit must be located in the rear garden of the main home.
• The total floor area cannot exceed 45 m².
• You must retain at least 25 m² of the original garden space.
• The unit requires a separate entrance.
• The owner of the property must live in the principal dwelling.

Even though you bypass the planning permission stage, you still have to comply fully with Building Control, fire safety regulations, and BER requirements. Ireland's nZEB (Nearly Zero Energy Building) minimum standard is BER A2. At Nua Living, our granny flats are designed to reach BER A1–A0, ensuring they exceed these legal requirements.

How do garden rooms and garden homes compare?

Garden rooms are lighter structures meant for daytime use, whereas garden homes require permanent foundations, high-grade insulation, and full utility connections.

Because a garden home is a permanent dwelling, the construction method matters immensely. We build using ICF (Insulated Concrete Formwork). This involves a reinforced concrete core poured on site between two permanent layers of insulation. It is not a timber-frame or steel-frame shed delivered on a lorry. Once your foundations are ready, the on-site structural build takes just 5–10 days.

How much does a permanent garden home cost?

Nua Living offers four fixed-price sizes for ICF garden homes, starting at €69,000 plus VAT at 13.5% for a 25 m² studio.

These prices include the design, the build, and full project management. They exclude site works, utility connections, and professional fees. Our four fixed prices are:

• 25 m² Studio Flat: €69,000 + VAT at 13.5%
• 33 m² 1 Bed Granny Flat: €93,900 + VAT at 13.5%
• 45 m² 1-or-2 Bed Granny Flat: €126,500 + VAT at 13.5%
• 48 m² 2 Bed Granny Flat: €134,500 + VAT at 13.5%

Notice that the 45 m² unit fits perfectly within the maximum size allowed by the S.I. No. 340/2026 exemption. If you want the larger 48 m² unit, you will still need to apply for standard planning permission. You can read more about the steps involved in our planning guide.

Do I still need to worry about Building Control?

Yes, planning exemption does not mean exemption from building regulations. You must still comply with all structural, fire safety, and energy efficiency standards.

Building Control ensures the home is safe and fit for human habitation. This means proper foundations, adequate ventilation, compliant electrical and plumbing work, and meeting the nZEB standards. Bypassing planning permission saves you time and council fees, but you still need a commencement notice and sign-off from a qualified professional.

Because our modular homes use ICF construction, they easily exceed these minimums, providing a warm, quiet, and permanent living space that will last for generations.

Frequently Asked Questions

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

Standard non-habitable garden rooms up to 25 m² are generally exempt from planning permission. For habitable garden dwellings, S.I. No. 340/2026 allows units up to 45 m² to be built without planning permission from 27 July 2026, provided specific conditions are met.

What are the conditions for the 2026 garden dwelling exemption?

Under S.I. No. 340/2026, the dwelling must be in the rear garden, be 45 m² or less, leave at least 25 m² of garden space, have a separate entrance, and the owner must live in the main house.

How long does it take to build an ICF garden home?

Once the foundations are ready, the on-site structural build using ICF (Insulated Concrete Formwork) takes 5–10 days. Design, planning, and utility connections will add lead time before construction begins.

Are Nua Living granny flats delivered fully built?

No. Nua Living homes are built on site using ICF (Insulated Concrete Formwork), which consists of a reinforced concrete core poured between permanent insulation layers. They are not timber or steel frames delivered on a lorry.

Ready to plan your garden home?

The best way to confirm your planning eligibility and get an accurate picture of the costs is to arrange a free, no-obligation site visit. We can assess your rear garden, check the 25 m² remaining space requirement, and help you choose the right layout. Check if your garden qualifies and get a fixed price.