From late July 2026, certain detached habitable accommodation, including back-garden modular structures and granny flats, can now be built without planning permission, provided they meet a range of strict conditions. The Irish Times.
These changes are part of wider planning regulation reforms introduced by the Department of Housing and hope to give homeowners greater flexibility.
However, experts quoted in the Irish Times have also asked people to be cautious.
Because while planning permission may no longer be required, building regulations, fire safety requirements and building control rules still apply. So your main takeaway from this article should be that Planning permission has become easier, but building a compliant dwelling has not.
Also, homeowners remain legally responsible for making sure that their project complies with all relevant regulations.
So, what exactly has changed, and what hasn’t?
The Key Highlights
| What Changed? | What It Means |
|---|---|
| Planning Exemption now Introduced | Certain ‘detached habitable accommodation’ can now be built without planning permission. |
| Size Limits | Buildings must generally be between 32m² and 45m². |
| Building Regulations Still Apply | Fire safety, accessibility, structure and energy standards must still be met. |
| Planning Authorities must still be notified | Homeowners MUST notify their local authority at least 14 days before construction begins. |
| No Separate Sale | The new dwelling CANNOT be sold independently from the main house. |
| No Separate Utility Connection | Water and wastewater services MUST remain connected to the principal dwelling. |
| Main Residence Requirement | The property owner MUST live in the principal house when construction begins. |
| Minimum Open Space | At least 25m² of private garden space must remain for the main dwelling. |
Planning Permissions are NOT Building Regulations
With a little research, I realised that one of the biggest issues that these changes could create is homeowners not understanding the difference between planning permission and building regulations.
Many people naturally assume that if planning permission isn’t needed, then the project has become much simpler. In reality, the planning exemption removes only one part of the process.
While Planning permission asks if a building should be allowed on a site, Building Regulations ask if people can safely live in this building.
Building Regulations deal with issues such as:
- Fire safety
- Structural integrity
- Ventilation
- Accessibility
- Energy efficiency
- Drainage
- Health and safety
Planning exemptions do NOT mean that these requirements have magically disappeared all of a sudden.
1. Industry Experts Still Advise Caution.
In the Irish Times article I mentioned, several experts quoted said the same thing; seek professional advice before starting any work!
Engineers Ireland, Mel Reynolds (Architect and housing policy analyst) & Orla Hegarty (UCD assistant professor ), all recommended that you speak to an architect, engineer or surveyor before starting any work.
So it shjould go without saying that when experts from different backgrounds all arrive at the same recommendation, it’s usually worth paying attention.
2. The Homeowner Is Still Responsible
Even though planning permission may not be required, the homeowner remains responsible for making sure that the dwelling complies with Building Regulations.
That means it is up to the homeowner to choose the right builder, obtain professional advice where necessary and ensure that all legal requirements have been met.
This is particularly important because, as Orla Hegarty points out, homeowners often have limited consumer protection if something goes wrong.
3. Don’t Forget the Hidden Costs
Proper budgeting is even more important now. Many people looking at modular homes understandably focus on the advertised purchase price, but the building itself is often only one part of the total project cost.
Professional fees alone could typically range from €4,000 to €5,000 for building control compliance on a small project., and additional costs may also include:
- Site preparation
- Groundworks
- Foundations
- Utility connections
- Drainage
- Engineering reports
- Architectural services
- Building control certification
- Landscaping etc,
Understanding and budgeting for these “soft costs” before buying a modular home can help avoid expensive surprises later.
Who Benefits the Most from this Exemption?
As with most things, these changes are unlikely to suit everyone. However, they could provide useful additional accommodation for:
- Older parents who want to remain close to family
- Adult children who need independent living space
- Family carers
- People accommodating relatives with additional needs
- Homeowners who need flexible living arrangements
Who Is Unlikely to Benefit?
It’s equally important to understand what these new rules do not allow.
The auxiliary dwelling or detached modular accommodation:
- Cannot be sold separately.
- Cannot have separate utility connections and must be connected to the main residence.
- Can only be built where specific exemption conditions are satisfied.
These restrictions mean that the new dwelling is not meant to create a separate property that can enter the open housing market.
Will This Help Solve Ireland’s Housing Crisis?
Of course not. Or not on its own at least.
- Because these homes cannot be sold separately, they are unlikely to increase the supply of homes available to first-time buyers or the wider housing market. Rather than creating large numbers of new starter homes, this policy mainly creates additional living options within existing households.
Now when I look at these changes in isolation, they appear relatively modest. However, when put close to other recent housing initiatives, a borader picture starts to appear.
In recent months, Ireland has introduced or expanded measures that include:
- Reductions in Apartment Sale VAT Rates
- Rural housing guideline updates (still being considered)
- Increased residential construction activity in 2026 when compared to previous years
- Local authority housing commissioning (Dublin City Council)
- Vacant and derelict property initiatives
- New planning exemptions for auxiliary dwellings
Each policy is aiming to address a slightly different part of Ireland’s current housing challenge, and no one policy is likely to solve the housing crisis on its own. But together, they may gradually increase the number of housing options available across Ireland.
Final Thoughts
Perhaps the biggest lesson from these changes is that making planning easier does not necessarily make building simple. SO the real test will be whether these reforms can actually help more families create safe, compliant homes, while alco complementing Ireland’s wider efforts to increase housing supply.
As these new planning exemptions begin to take effect, other questions remain:
- Will any of these policies help to improve actual affordability over time?
- Will auxiliary dwellings meaningfully reduce housing pressure for multigenerational families?
- Should similar planning reforms also be extended to other forms of housing in the future?
- And while these exemptions create more living options, how much will they contribute to improving Ireland’s overall housing supply and affordability over the coming decade?
Only time, and data, will provide these answers.
