Garden homes: 103 backyard cabins notified to councils in first month — South Dublin leads with 18

# What changed

The government introduced an exemption under Class 3A of the Planning and Development Regulations 2001 that took effect on 27 July. It allows modular garden units of 32–45 square metres to be built in private back gardens without formal planning permission, provided certain conditions are met and the homeowner notifies their local council.

# How the rules work

# Early uptake and where units are planned

In the first month after the change, councils received 103 notifications for backyard homes. South Dublin County Council logged the most notifications with 18. Other counties with notable numbers are Clare (10), Tipperary (8), Fingal (7), Wexford (7), Kildare (6), Cork County (6), and Galway, Wicklow and Waterford (5 each). The data does not specify whether these units will house family members or be offered to tenants.

# Renting, taxes and tenant protections

A significant downside for occupants is that these garden units fall outside standard rental law. Tenants would not have access to the Residential Tenancies Board (RTB), meaning the usual legal protections and dispute-resolution routes for renters do not apply.

# Government rationale and responses

Officials and proponents argue the move will unlock additional beds quickly and reduce the burden of minor planning applications on local planners. When first proposed in 2025, the government framed the measure as a way for younger and older family members to live independently yet close to relatives. Later the rules were broadened to permit private renting under the Rent-A-Room relief.

Housing and older people's charities have expressed concern that the change could create a new category of renters without statutory protections, exposing potentially vulnerable occupants to insecure arrangements.

# Practical implications for homeowners and renters

Homeowners considering installing a modular garden unit must confirm the unit size falls between 32 and 45sqm, ensure 25sqm of garden remains, provide a separate entrance and live in the main house. They must notify the local council before building.

Potential tenants should be aware that occupancy in these units does not carry the same legal rights as conventional rented accommodation. Prospective renters may want to seek clarity about contracts, duration of stay and dispute options before moving in.

# What's still unclear

Available notifications do not indicate intended use (family occupancy versus private letting) or how councils will monitor compliance with the remaining garden-space and entrance requirements. The immediate take-up shows interest, but long-term effects on the housing market and tenant protections are yet to be seen.

# Quick summary

The Class 3A exemption has led to 103 notifications in its first month, concentrated in South Dublin and several other counties. The scheme allows quicker delivery of small modular homes, offers a tax pathway for lets under Rent-A-Room relief, and raises concerns because occupants in these units lack RTB protections.