Garden Rooms & House Extensions in Ireland: New Planning Rules for 2026
If you’ve been thinking about creating more space at home, 2026 could be the perfect time to start your project.
New planning exemption rules in Ireland have increased the size of certain garden rooms and house extensions that may qualify as exempted development.
For homeowners across Dublin and surrounding areas, this could mean more flexibility when planning a garden office, garden room, home gym or house extension.
At HomeZone Garden, we design and build bespoke garden rooms and home improvements tailored to your property and lifestyle.
New planning exemption regulations came into effect in Ireland on 27 July 2026. Two of the biggest changes for homeowners are:
This gives homeowners more possibilities when looking to increase their usable living space.
However, exempted development is still subject to specific conditions and limitations, so not every 30m² garden room or 45m² extension will automatically qualify without planning permission.
Garden rooms have become one of the most popular ways to add functional space to an Irish home without changing the existing internal layout.
Under the new rules, qualifying garden structures can now have a total floor area of up to 30m², increased from the previous 25m² threshold.
A bespoke HomeZone Garden room can be designed for many different uses, including a home office, gym, studio, playroom, hobby room or simply a comfortable additional space away from the main house.
The extra 5m² available under the updated exemption can make a significant difference when designing a practical, comfortable room.
Importantly, the 30m² allowance remains subject to the relevant exempted-development conditions. Homeowners should therefore check that their individual property and proposed project qualify before construction begins.
The changes are also great news for homeowners considering a house extension in Dublin or elsewhere in Ireland.
The exempted development threshold for qualifying house extensions has increased from 40m² to 45m².
That additional space can create exciting possibilities for a larger kitchen, open-plan kitchen and dining area, family room, utility room or expanded living space.
If a house has already been extended, previous extensions can affect how much additional development may qualify as exempt, so the planning history of the property needs to be considered.
The right option depends on how you want to use the additional space.
A garden room gives you a separate space away from the main house. It can be ideal for working from home, exercising, hobbies or creating a peaceful multifunctional room at the end of the garden.
A house extension integrates the additional floor area directly into your existing home and can completely transform kitchens, dining areas and family living spaces.
At HomeZone Garden, we can discuss your ideas and help you explore which option could work best for your available space.
Not necessarily. A qualifying garden room may be considered exempted development, meaning a full planning application may not be required.
However, simply staying below 30m² does not automatically make a project exempt. Other planning conditions and restrictions still apply. You can read more in our guide to garden room planning permission in Ireland.
The same principle applies to house extensions. The new 45m² threshold provides more flexibility, but the proposed extension must meet the relevant requirements to qualify.
Official planning regulations confirm that exempted development depends on both the type of development and compliance with its associated conditions and limitations.
At HomeZone Garden, we create outdoor and additional living spaces designed around the way our clients actually use their homes.
From the initial idea through construction and finishing, our team can deliver a complete project with a focus on modern design, quality materials and practical use of space.
Whether you’re considering a garden room, garden office or house extension, we can talk through your ideas and discuss what’s possible for your property.
The new 2026 planning rules could give you more options than before. Whether you’re considering a 30m² garden room or a larger house extension of up to 45m², now is a great time to explore your options.
Tell us what you’re thinking about, how much space you have and what you’d like to achieve. Our team can discuss the possibilities and provide a quotation for your project.
Contact HomeZone Garden today for a friendly, no-obligation chat.
Planning exemptions are subject to applicable conditions, limitations and individual site circumstances. Where planning status is uncertain, confirmation should be sought from the relevant local authority or a suitably qualified planning professional.
Planning a garden project in Dublin or surrounding areas? Contact HomeZone Garden and send us a few photos of your space.
