Do not rely on a supplier summary. Check Schedule 2, Part 1, Class 3 of the Planning and Development Regulations and any restriction affecting the property. If the facts are uncertain, ask the planning authority about the appropriate pre-application or Section 5 declaration route before ordering.
What Class 3 covers
The official text covers the construction, erection or placing within the curtilage of a house of a greenhouse, garage, store, shed or similar structure. The exemption is conditional, not automatic.
Record each Class 3 condition
- Position: the structure must not be forward of the front wall of the house.
- Aggregate area: the total area of the relevant structures within the curtilage, including earlier structures, must not exceed 25 square metres.
- Private open space: at least 25 square metres of private open space must remain to the rear or side for the occupants' exclusive use.
- Side finishes: where the rule applies, external finishes and a tiled or slated roof covering must conform with those of the house.
- Height: the Class 3 text sets a maximum of 4 metres for a tiled or slated pitched roof and 3 metres in other cases.
- Use: the structure must not be used for human habitation and must remain incidental to the enjoyment of the house.
A correction to a common boundary claim
The Class 3 text does not contain a general “within 1 metre of a boundary means 2.5 metres high” condition. That wording appears in guidance from other jurisdictions and should not be imported into an Irish planning decision. Boundary position can still matter for title, easements, fire safety, drainage, neighbour impacts and other rules, so record it and seek project-specific advice where needed.
Why meeting the dimensions may still be insufficient
Article 9 and other provisions can restrict or remove an exemption in particular circumstances. Existing planning conditions, protected structures, architectural conservation areas, special amenity areas, environmental constraints, access or service works, and the specific use can all change the analysis. A shed specification is not proof that a development is exempt.
When to pause before paying
- The aggregate area or remaining-open-space calculation is unclear.
- The proposed structure is forward of the house, unusually tall or intended for sleeping or public-facing business use.
- The property is protected, in an architectural conservation area, or subject to a planning condition that may restrict development.
- Ground levels, drainage, retaining work, access or service connections form part of the proposal.
- A supplier asks you to accept responsibility for planning without giving exact drawings and dimensions.
Formal route when status is uncertain
A planning authority can determine whether a proposal is or is not development and whether it is or is not exempted development through the statutory declaration process commonly called a Section 5 declaration. Ask the relevant authority what plans, measurements, ownership details and fee are currently required. Do not describe an informal phone conversation as a planning decision.
Official sources
- Irish Statute Book: Planning and Development Regulations 2001, see Schedule 2, Part 1, Class 3 and Article 9.
- Department of Housing: compiled Schedule 2, Planning and Development Regulations 2001–2025.
- Your local planning authority's current Section 5 declaration form and guidance.
Keep a planning record
Save the dated site plan, dimensions, roof form, photographs, aggregate-area calculation, intended-use note, relevant planning history and any written authority response. If the design changes, review the planning question again.
Scope note: This is general source-navigation information, not legal or planning advice and not a guarantee of exempted-development status.