On 27 July 2026, the Department of Housing, Local Government and Heritage introduced a comprehensive package of new planning exemptions for residential properties, representing one of the most significant updates to Ireland's exempted development regulations in almost 25 years.

The reforms are designed around two key objectives:

  • Reducing the administrative burden on homeowners and their families while allowing planning authorities to focus resources on more complex developments; and
  • Providing greater flexibility for homeowners to make more efficient use of existing residential space through extensions, adaptations and enhancements.

At a time when housing supply and affordability remain central policy concerns, these changes aim to remove unnecessary barriers for homeowners seeking to adapt their properties to changing family, lifestyle and housing needs.

Key Changes

The Planning and Development (Exempted Development (Act of 2000)) Regulations 2006, amend the Planning and Development Regulations 2001 and introduces a number of practical and long-awaited measures, including:

  • Larger Home Extensions: The exemption for extensions to a principal dwelling has increased from 40 sq.m. to 45 sq.m.
  • Dormer Conversions and Roof Lights: New exemptions allow certain dormer roof boxes and roof lights to be added to a principal dwelling without planning permission.
  • Subdivision of Existing Homes: Homeowners may now subdivide a principal dwelling to create one additional self-contained residential unit within the existing building envelope, subject to conditions including a minimum floor area of 32 sq.m. for each unit (“Class 1A Exemptions”).
  • Detached Auxiliary Garden Dwellings: One of the most notable reforms permits a detached habitable accommodation unit to the rear of a principal dwelling, ranging from 32 sq.m. to 45 sq.m., connected to the services of the main house. This provides a practical option for multi-generational living and changing family circumstances (“Class 3A Exemptions”).
  • Energy Efficiency Improvements: Homeowners can now install external wall insulation under a new exemption aligned with existing SEAI grant schemes, while heat pump exemptions have also been expanded and are no longer confined to the rear of a property.
  • Cycle and Bin Storage: New exemptions facilitate practical front and rear garden storage solutions for bicycles, cargo bikes and wheelie bins.
  • Larger Garden Structures: The exemption for detached structures such as sheds, home offices, studios and gyms has increased from 25 sq.m. to 30 sq.m.
A More Pragmatic Planning System

These reforms acknowledge how modern housing needs have evolved. Families require greater flexibility to accommodate older relatives, adult children working from home, changing household structures and improved energy efficiency measures.

Importantly, while planning permission may no longer be required for many of these works, homeowners must still comply with all applicable Building Regulations, Building Control requirements and fire safety standards. In addition, the Class 1A Exemptions and Class 3A Exemptions require prior notification to the relevant planning authority at least 14 days before the commencement of development. These exemptions are also time-limited and are currently due to expire on 31 December 2030.

The reforms reflect a broader policy shift towards removing unnecessary procedural barriers while maintaining appropriate regulatory oversight. After almost a quarter of a century without significant reform of the residential exempted development regime, these measures represent a welcome modernisation of the planning system and are likely to facilitate the more efficient use of existing housing stock, while providing homeowners with greater flexibility to adapt their homes to changing needs.

For more information or assistance with queries relating to the new planning exemptions, please contact Terry O'Malley, Lynda O'Neill or any member of the Flynn O’Driscoll Real Estate Team.

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