There's a shift in Irish property that most people haven't run the numbers on yet. It isn't a new tax break or a clever fund. It's the patch of grass between your kitchen window and the back fence.
Two rules that have never lined up before
Draft planning regulations brought to Cabinet in April 2026 would, if enacted as drafted, let you place a self-contained 32–45 m² home in your rear garden with no full planning permission where the conditions are met. Separately, the long-standing Rent-a-Room scheme lets a homeowner earn up to €14,000 a year from a tenant, exempt from income tax, USC and PRSI.
Put a self-contained garden home together with the Rent-a-Room scheme and, for the first time, those two things line up. For a homeowner with a usable garden and some capital, that's not a renovation project. It's an income stream parked on ground you already own.
One honesty note up front, because it matters: these regulations are still in draft and not yet enacted, and Rent-a-Room treatment depends on the dwelling being linked to your principal house's services and on your own circumstances. Confirm the tax position with a qualified accountant and the planning position with your solicitor before you rely on any projected return.
The honest version of the maths
Let a fully-fitted unit to a single tenant or a couple at, say, €1,150 a month, and that's €13,800 a year, just under the €14,000 ceiling. If that income qualifies under the scheme, the saving versus taxed rental income, for a higher-rate taxpayer, is in the order of €5,500 income tax, €1,100 USC and €550 PRSI.
What we will not do is print a single headline "yield %". Here's why that would be dishonest: your yield is simply €13,800 divided by your all-in installed cost, and that cost depends on your foundation, crane, services run and BER, all of which vary from one garden to the next. The only honest figure is the one run against a real quote for your site, so we model your exact yield and payback for you, with every cost line shown.
The reason the ratio tends to be strong is the entry price, not spin: a unit like the Ériu 20ft Expandable starts from €25,000 delivered and reaches a fully-fitted, rentable, A2-BER home at a fraction of the €110,000–€180,000 an Irish-built equivalent costs. Lower cost in, same €14,000 ceiling out.
What a serious investor needs to know, told straight
An income stream is only as good as its legality and its risks. Three things to weigh:
- The RTA carve-out is proposed, not certain. The draft rules would carve the auxiliary dwelling out of the Residential Tenancies Acts when let under Rent-a-Room, meaning no RTB registration and no rent-pressure-zone limits. That's a genuine operational advantage over a conventional rental if enacted as drafted. Treat it as proposed until the final wording is law.
- LPT and insurance. The unit is expected to get its own LPT band, and your home insurance must be updated to declare the structure, or you risk invalidating cover on the main house. Most insurers quote an uplift rather than a separate policy.
- Mortgage and resale. Most Irish lenders will not currently mortgage a property with a second self-contained dwelling on the same title, which has resale and portability implications. Many investors fund the unit through other finance to ring-fence the house mortgage.
We provide a written LPT, insurance and mortgage briefing with every quote, and we'd always say have your solicitor review it. The compliance matters to the income, too: a unit that isn't lawfully occupiable can't be lawfully let, which is why every Ériu home is specified to the Building Regulations and supplied A2-BER-ready with a full compliance pack. Here's what that covers.
The April 2026 rules created the opening. Whether it's a good investment for you comes down to your site and your numbers, so start there, not with a headline.
Frequently asked questions
Can I earn tax-free income from a home in my back garden in Ireland?
Where a self-contained garden dwelling is linked to your principal house services, rental income from a tenant may fall under the Rent-a-Room scheme, up to €14,000 a year exempt from income tax, USC and PRSI. The draft 2026 regulations are also proposed to carve the dwelling out of the Residential Tenancies Acts. The regulations remain in draft and Rent-a-Room treatment depends on your circumstances, so confirm both the planning and tax positions with a qualified accountant and solicitor.
What yield will a garden rental home produce?
The yield is the tax-free rent (up to €14,000 a year) divided by your all-in installed cost, so it depends on what you spend. Because a factory-direct unit starts from €25,000 delivered and finishes well below an Irish-built equivalent, the ratio is strong, but the only honest figure is the one modelled against a real quote for your site, which we provide.
Do RTB rules and rent-pressure-zone limits apply?
The draft 2026 regulations are proposed to carve the auxiliary dwelling out of the Residential Tenancies Acts when let under Rent-a-Room, so RTB registration and rent-pressure-zone rules would not apply if enacted as drafted. Treat this as proposed, not certain, until the final wording is enacted, and confirm with your solicitor.
