Back-garden modular homes in Ireland, the complete 2026 guide.
In April 2026 the Government published draft regulations that could reshape how Irish homeowners use their back gardens: a self-contained home of up to 45 m², potentially without full planning permission, with rental income that may qualify for up to €14,000 a year tax-free under the Rent-a-Room scheme. Here's how it would work, and what to watch for.
What the draft Exempted Development Regulations actually say
On 21 April 2026, Minister for Housing James Browne and Minister of State John Cummins brought a draft of the new Exempted Development Regulations to Cabinet. The intent is to unlock latent residential capacity inside existing housing stock, without the planning bottleneck that has slowed Irish housing supply for a decade.
The draft proposes four overlapping exemptions, each targeting a different way to add living space to an existing residential plot:
1. Auxiliary habitable dwelling (32–45 m²)
A detached self-contained dwelling in the rear garden of a principal house, between 32 and 45 square metres of floor area, with services (water, electricity, drainage) linked to those of the principal house. No full planning permission would be required where the conditions are met. Crucially, the rental income from this unit is proposed to be carved out of the Residential Tenancies Acts, so RTB rules, rent-pressure-zone rules and tenancy registration requirements would not apply if enacted as drafted. See the precise legal definition, qualifying conditions and the LPT, insurance and mortgage implications →
2. Sub-division exemption
One additional self-contained unit (minimum 32 m²) can be created inside the existing house envelope without planning permission. Useful for converting a larger family home into the family home plus a rental flat, or providing a self-contained unit for a family member.
3. Garden structures raised to 30 m²
The garden structure exemption, for sheds, offices, gyms and studios that are not self-contained habitable dwellings, is raised from 25 to 30 square metres. This is the regulation that covers a garden room or garden office. Garden structures sit under a separate legal category from auxiliary dwellings and do not need to be linked to the principal house's services.
4. Principal extension raised to 45 m²
The existing principal extension exemption is raised from 40 to 45 square metres. This is the regulation for an extension to the principal house itself.
Timing
The regulations were brought to Cabinet on 21 April 2026 and are subject to environmental assessment before being laid before the Houses of the Oireachtas. The Government has indicated implementation is intended within 2026, but final wording, conditions and effective date are still to be confirmed at the time of writing.
The €14,000 tax-free figure, and how the return actually works
The reason this exemption is generating so much interest is how it interacts with one existing scheme: Rent-a-Room relief. Under current Revenue rules, up to €14,000 a year of qualifying rent is exempt from:
- Income tax
- USC (Universal Social Charge)
- PRSI
The draft regulations are proposed to bring a linked auxiliary dwelling within scope, because its services connect through the principal house. If that holds in the enacted wording, rent from the unit, up to the €14,000 ceiling, could be received tax-free.
What that is worth as a yield depends entirely on your all-in installed cost, so we deliberately don't publish a single headline percentage, it would be meaningless without your figure. The honest way to look at it is a simple ratio:
tax-free yield ≈ annual tax-free rent ÷ your all-in installed cost
Two things follow. First, because the rent is exempt from income tax, USC and PRSI, €14,000 received tax-free goes considerably further than €14,000 of ordinary taxable rent, for a higher-rate taxpayer, close to twice as far once the marginal rate is applied. Second, the lower your all-in installed cost, the higher the return, which is precisely why sourcing the unit factory-direct rather than buying Irish-built moves the number so much. Ask us for an itemised all-in cost for your site and you can run the ratio against your own figure.
As a reference point, a basic but livable unit that meets the regulations starts from around €25,000 delivered, a 20FT fold-out, including sea freight and simple furniture, with finish upgradeable from there. Add your Irish-side site works (foundation, crane, services connection and BER) to reach the all-in installed cost the ratio uses. The full cost breakdown is here.
As Keith Lowe of DNG put it in The Irish Times, "this is the kind of return that drives mass adoption."
Important, please read this before relying on any return. This exemption sits in draft regulations that are subject to environmental assessment and not yet enacted; the final wording, conditions and effective date may change. Rent-a-Room treatment depends on the unit qualifying and on your own circumstances. Confirm both the planning position and the tax treatment with a qualified accountant and solicitor before relying on any projected return. The SCSI and IPAV have specifically cautioned buyers against over-relying on headline yields in this category.
Six trust questions every Irish buyer is asking
The same Irish experts who welcomed the legislation also flagged the six issues below, every one of which the SCSI, IPAV and Sherry FitzGerald hammered in the immediate press coverage. Anyone selling back-garden modular homes who doesn't proactively address these six points will leak trust.
1. Planning exemption is not building regulations exemption
Every habitable dwelling in Ireland, auxiliary or not, must still meet the Irish Building Regulations (TGD Parts A to M) and is subject to BER assessment. A modular unit installed under the planning exemption is still subject to structural, fire, ventilation, energy and accessibility requirements. What Ériu Modular Homes does: every unit is specified to TGD Parts A to M, with a written compliance pack supplied. A BER assessment is conducted by an Irish-registered assessor on completion.
2. The unit gets its own LPT band
The draft regulations indicate that an auxiliary habitable dwelling would receive its own property ID and its own LPT band, separate from the principal house. The annual LPT payable would depend on the unit's open-market value and the local authority's adjustment factor. What we do: we provide an indicative LPT estimate in the briefing pack with every quote, and flag that the final treatment follows the enacted regulations.
3. Home insurance must be updated
If a new structure is added to a residential plot and the insurer is not notified, cover on the principal house can be invalidated. Most Irish insurers will quote an uplifted premium rather than require a separate policy. What we do: we provide a list of insurers known to write cover for principal-plus-auxiliary configurations.
4. Mortgage and resale implications
Most main Irish mortgage lenders will not currently extend a mortgage on a property containing a second self-contained dwelling on the same title. This affects resale value and mortgage portability. Many homeowners use a chattel mortgage, personal loan or credit union finance to fund the modular unit specifically to avoid affecting the principal house mortgage. What we do: we provide an introductory financing options note with every quote.
5. Long-term durability in Irish weather
Imported modular units sometimes carry insulation, finishes and weatherproofing specified for drier or warmer climates. The Irish weather profile, wet, windy, occasional frost, has specific implications for U-values, cladding lap details, roof falls and air-tightness. What we do: every unit ordered for an Irish site is specified to Irish-climate weatherproofing standards before production starts.
6. Quality of imported MMC units in transport and installation
Imported Modern Methods of Construction (MMC) units can be damaged in transit, particularly when handled by inexperienced installers. What we do: every unit is photographically inspected at the factory before sealing, again at Dublin Port, and again on site before craning. A vetted installer network handles foundations, craning, services connection and final sign-off.
What changes when the manufacturer is in Henan, not Meath
Three named competitors lead the Irish-built market: Rayco, The Pod Factory in Meath, and Modular Home Ireland. Their pricing on a comparable 2-bed 45 m² unit typically lands between €110,000 and €180,000 fully fitted. Ériu Modular Homes sources direct from Henan Province factories that supply the same expandable container and steel-frame modular categories, at factory-gate prices.
The result, on a like-for-like specification: an Irish-installed Ériu Modular Homes Tier 2 Turnkey unit typically lands 25 to 45 percent below the Irish-built equivalent. The savings come from removing the European intermediary stack, not from cheaper finishes. Compliance, BER, insulation specification and warranty are matched or exceeded.
What you don't get with factory-direct that you do with Irish-built: a 9–12 month build window. Ériu modular projects typically install in 14 to 18 weeks from order. For most homeowners that is the bigger advantage.
See the model specifications →Back-garden modular homes, questions answered
Last reviewed: June 2026
What is the 45 m² back-garden exemption in Ireland?
The 45 m² exemption refers to the new Exempted Development Regulations brought to Cabinet by Ministers Browne and Cummins on 21 April 2026. It allows a detached self-contained habitable dwelling of between 32 and 45 square metres to be built in the back garden of a principal house without full planning permission, provided the new unit is linked to the services of the principal house and meets the prescribed conditions. The exemption is one of four overlapping measures intended to unlock latent residential capacity in existing housing stock.
How much can a 45 m² back-garden modular home in Ireland cost?
Irish-built back-garden modular homes typically range from €110,000 (basic 2-bed shell) to €180,000 (turnkey luxury) for a 32 to 45 square metre unit. Imported steel-frame and expandable container homes from Henan Province, supplied and installed by Ériu Modular Homes with full Irish Building Regulations compliance, are typically 25 to 45 percent below Irish-built pricing for an equivalent specification. Pricing is project-specific to your site, tier and finish choices.
Can I rent out my back-garden modular home?
Yes. The draft 2026 regulations are proposed to carve the auxiliary back-garden dwelling out of the Residential Tenancies Acts, so RTB registration and rent-pressure-zone rules would not apply if enacted as drafted. Rental income may fall under the Rent-a-Room scheme, up to €14,000 a year tax-free where the unit qualifies and its services link to the principal house. The yield depends entirely on your all-in installed cost, so we don't quote a single headline percentage. Because the regulations are still in draft and Rent-a-Room treatment depends on your circumstances, confirm both the planning position and the tax treatment with a qualified solicitor and accountant before relying on any projected return.
Does a 45 m² back-garden home need planning permission?
Under the draft exemption, no, provided the unit meets the conditions (32 to 45 square metres, detached, linked to the services of the principal house, located in the rear garden). However, planning exemption is not building regulations exemption. Every habitable structure in Ireland must still meet the Irish Building Regulations (TGD Parts A to M) and is subject to BER assessment. The Society of Chartered Surveyors Ireland (SCSI) and the Institute of Professional Auctioneers and Valuers (IPAV) have both warned that buyers often confuse the two. Ériu Modular Homes supplies units fully specified for Irish Building Regulations compliance, with the written compliance pack accompanying every order.
What conditions must a back-garden modular home meet to qualify for the exemption?
The draft regulations require: the unit must be detached from the principal house, the floor area must be between 32 and 45 square metres, the unit must be located in the rear garden, services (water, electricity, drainage) must be linked to those of the principal house, and the unit must be a habitable dwelling rather than a commercial unit. Site-specific factors, distance from boundaries, height, overlooking, established trees and Protected Structures, may still trigger a need to consult the local authority. Each Ériu Modular Homes project includes a site eligibility check against the current draft conditions.
How will a back-garden modular home affect my home insurance and mortgage?
Home insurance must be updated to declare the new structure, failing to do so can invalidate cover on the principal house. Most Irish insurers will quote an uplifted premium rather than require a separate policy. On mortgages, most main Irish lenders will not currently extend a mortgage on a property that contains a second self-contained dwelling on the same title, which has resale implications. Some homeowners use chattel mortgages, personal loans or credit union finance to fund the modular unit specifically to avoid affecting the principal house mortgage. Ériu Modular Homes provides a written LPT, insurance and mortgage briefing pack with every quote.
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