New Planning Permission Rules for Modular Homes in Ireland

Ireland is facing a serious housing shortage, and many people are looking for faster, more affordable ways to create safe, comfortable homes. To help with this, new planning permission rules were introduced on 27 July 2026. These rules make it easier to put small modular homes in place, especially in back gardens or on existing sites, so that families, self-builders, and communities can respond more quickly to housing needs.

Under the new rules, certain modular houses up to 45m2 can now be installed with much simpler planning requirements than before. This change is designed to cut red tape, reduce waiting times, and lower costs, while still keeping important safety and design standards in place.

What Has Changed Compared to Previous Rules?

Before 27 July 2026, most modular homes were treated in the same way as traditional houses for planning purposes. In many cases you had to:

• Apply for full planning permission, even for small modular units.
• Wait several months for a decision from the local authority.
• Prepare detailed drawings, reports, and pay full application fees.
• Meet stricter setback and design rules that were not tailored to modular construction.

The new rules introduce a lighter planning approach for qualifying modular homes up to 45m2. In many situations, these units may be treated more like exempt or streamlined developments, provided they meet clear conditions on size, height, location on the site, and use. The aim is to make it more practical to add a small home for family members, temporary accommodation, or downsizing on an existing property.

Who Do the New Rules Apply To?

The changes are designed to help several groups:

• Homeowners – People who want to place a small modular home in their garden or on their land, for example for an adult child, an older relative, or to downsize while staying on the same site.
• Self-builders – Individuals or couples who want to build their own compact home using modular construction, taking advantage of faster build times and more predictable costs.
• Modular home companies – Businesses that design, manufacture, and install modular units now have clearer, more consistent rules to work with, making it easier to advise customers and plan projects.

Local authorities and housing bodies may also benefit, as the new framework supports small, well-planned modular developments that can be delivered quickly where housing demand is high.

Main Benefits of the New Rules

The updated planning rules bring several important advantages:

• Speed – With simpler planning requirements for qualifying units, projects can move from idea to installation much faster. This reduces long waiting periods and helps people respond quickly to changing family or housing needs.
• Cost savings – Less complex planning processes can mean lower professional fees, reduced paperwork, and fewer delays. Combined with the typically lower build cost of modular homes, this can make small homes more affordable.
• Flexibility – Modular homes up to 45m2 can be used in many ways: as a main home, a granny flat, a starter home, or temporary accommodation while a larger house is being renovated. Units can often be reconfigured in the future.
• Certainty – Clearer rules give homeowners, self-builders, and companies more confidence when planning a project. Knowing the size limits, placement rules, and basic conditions in advance makes it easier to design a compliant home.
• Better use of existing land – The new approach encourages careful use of gardens and existing plots, helping to create extra homes without always needing large new housing estates.

Key Points to Keep in Mind

While the rules are more flexible, they do not remove all controls. In general, you will still need to:

• Make sure the modular home is no larger than 45m2 and within any height limits.
• Respect boundaries, neighbours’ privacy, and access requirements.
• Comply with building regulations for safety, insulation, fire protection, and services.
• Check any local conditions, such as protected structures, special amenity areas, or estate rules.

Because every site is different, it is wise to speak with your local authority or a planning professional before ordering or installing a modular home. They can confirm how the new rules apply to your situation and help you avoid problems later.

Overall, the 27 July 2026 changes are an important step in making housing in Ireland more flexible, faster to deliver, and better suited to real-life needs. For many people, a well-designed modular home up to 45m2 could now be a realistic and achievable option.

The regulations are temporary and apply only to projects commenced and completed between 27 July 2026 and 31 December 2030 

Planning Permission Easements for 45m² Modular Houses in Ireland

Important: This is a general, non‑legal overview based on typical Irish planning rules and recent easement proposals. Always confirm details with your local planning authority or a qualified professional before building.

1. Maximum Size and Floor Area

• Maximum floor area: The new detached habitable unit must be at least 32 m² up to 45m².
• Single unit only: The easement usually applies to one modular unit per residential site, not multiple scattered pods.
• Ancillary to main house: The modular home must remain secondary to the main dwelling, not the primary residence on the plot.
• No subdivision of site: The unit cannot create a separate planning unit or independent site for sale or short term letting.
• Any existing Class 3 garden structures (such as sheds or garages) count toward this 45 m² overall limit. 

2. Height and Storeys

• Maximum height:  in Ireland is 4.0 metres for a tiled or slated pitched roof, and 3.0 metres for any other roof type (such as a flat roof) 
• Storeys: Due to the 3m/4m height caps, Class 3A structures are strictly limited to single-story living spaces.

3. Placement on the Site

• Location: Must be built in the rear garden (curtilage) of the main property.
• Access: Independent pedestrian and / or wheelchair access to the detached house has to be provided for within the curtilage of the principal house and no new vehicle or pedestrian access on to a road will be constructed under this exemption.
• Site coverage: The construction, erection or placing within the curtilage of the principal house of any such structure can not reduce the total amount of private open space reserved exclusively for the use of the occupants of the house to less than 25 square metres.  

4. Distances from Boundaries 

• Structure boundaries: The structure will be a distance not less than 0.6 metres from any wall or party boundary 
• Windows: Any windows proposed in the structure will be at least 0.6metres from the boundary they face.  

5. Permitted Uses

• Home office / studio: Allowed where the use is ancillary to the main dwelling and does not generate significant traffic, noise or visitors.
• Granny flat / family accommodation: Often permitted as ancillary family accommodation for relatives dependent on the main household.
• Temporary accommodation: 
• Separate dwelling: The unit should not function as an independent dwelling with separate postal address, separate driveway or fully independent services without planning permission.
• The principal dwelling house must be the sole or main residence of the property owner at the time the development is commenced.  
• The detached auxiliary dwelling structure is not temporary in nature such as a caravan or mobile home.  

6. Services and Utilities

• Water and wastewater: There must not have a separate connection to utilities, including water or wastewater utilities.  
• In the case of non-piped waste water treatment, the structure must not encroach on any approved percolation area. On site waste water, treatment shall be of sufficient capacity to meet the additional loading and shall comply with the EPA Code of Practice for Domestic Waste Water Treatment Systems. There must not be any additional waste water treatment units installed as part of this class.

7. Safety, Building Standards and Access

• Building Regulations: Even where planning permission is eased, the unit must comply with Irish Building Regulations (structure, fire, ventilation, energy, accessibility where applicable).
• Fire safety: Adequate escape routes, fire‑resistant construction between the unit and nearby buildings, and safe separation distances are essential.
• Foundations and stability: Modular units must be installed on suitable foundations or supports designed for local ground conditions and wind loads.
• Access and inclusivity: Level or ramped access, safe steps, handrails and adequate door widths should be considered, especially for granny flats or care use.
• Ventilation and moisture control: Proper ventilation, insulation and damp‑proofing to prevent condensation and mould, particularly in small, intensively used spaces.

8. What Is Typically Not Allowed Under Easements

• The detached auxiliary dwelling not be used for the purpose of short-term letting.
• The detached auxiliary dwelling can only be occupied in conjunction with the main dwelling house and can not be sold or subdivided separate to the principal dwelling.  

Next step: Before ordering or installing a modular unit, prepare a simple site plan, check your local development plan, and seek written advice from your local planning authority or a planning consultant to confirm that your specific proposal fits within the current easement rules. This is an optional step, but it can put your mind at ease.