Section 5 Declaration Ireland: How to Confirm If Planning Permission Is Needed

A Section 5 declaration is the closest thing the ordinary homeowner has to asking the planning system:

“Please tell me formally whether this needs planning permission.”

That can be much more useful than relying on a conversation, a neighbour’s extension or a general online checklist.

For the broader system, see Planning Permission in Ireland: The Complete Guide.

Why use a Section 5 declaration?

Many planning questions are clear.

A new house normally needs permission.

A small internal decorating job normally does not.

The difficult cases sit in between.

Examples include:

• an old extension with no planning file;
• a proposed extension close to an exemption threshold;
• a garage conversion;
• a garden room;
• a change of use;
• a business operating from a house;
• short-term letting questions;
• work in an Architectural Conservation Area;
• solar or other external equipment;
• or a structure whose planning history is unclear.

In those situations, informal advice may not be enough.

A Section 5 declaration gives you a formal planning-authority determination on the question put to it.

What exactly is the question?

The planning authority is not being asked whether it likes the development.

It is being asked a legal planning-status question.

Broadly:

1. does the proposal or existing situation constitute development?
2. if yes, is it exempted development?

That is different from a normal planning application, where the authority is deciding whether permission should be granted.

Section 5 is not planning permission

This distinction is crucial.

A favourable Section 5 declaration does not mean:

“The council has granted planning permission.”

It means, in effect:

“On the question and information provided, this is not development requiring permission, or it is development that is exempt.”

That difference matters when explaining the paperwork later to:

• a buyer;
• solicitor;
• lender;
• surveyor;
• architect;
• or planning authority.

When a Section 5 declaration is especially useful

An extension has no planning reference

The extension may have been exempted development.

A missing planning file is not proof of unauthorised development.

A Section 5 declaration can help establish the position where the facts support exemption.

You are close to the 40 m² extension limit

If previous extensions exist or measurements are unclear, the planning status may not be obvious.

See House Extension Planning Permission Ireland.

You are changing how a building is used

The planning system distinguishes physical works from changes of use.

A use change can itself amount to development.

A solicitor or purchaser wants certainty

When property is being sold, an unresolved planning question can become a transaction problem.

A formal declaration may be more valuable than a verbal opinion.

What does a Section 5 request cost?

Cork City Council’s current published guidance lists the local-authority fee as €80.

Check the current fee and submission requirements with the relevant planning authority before lodging.

What should you submit?

The authority needs enough information to answer the exact question.

Depending on the case, include:

• applicant details;
• address and site location;
• clear wording of the question;
• detailed description;
• site map;
• floor plans;
• elevations;
• photographs;
• measurements;
• planning history;
• dates of works;
• previous permissions;
• and any professional planning analysis.

For an existing extension, vague wording such as:

“Is my extension exempt?”

may be much less useful than a properly documented request showing its size, date, location, height, windows and earlier extension history.

Existing development versus proposed development

Section 5 can be relevant to both proposed and existing situations.

If the work already exists, provide accurate information about what was actually built.

If it is proposed, provide enough design detail that the authority is not being asked to rule on a moving target.

How long does it take?

The statutory Section 5 process has its own decision framework, and further information can be requested where the authority needs more material.

The practical lesson is simple:

Do not leave the declaration until the week before a sale, mortgage drawdown or construction start.

If planning status matters to a transaction, resolve it early.

What if the council says it is not exempt?

A Section 5 declaration is not a refusal of planning permission.

It is a declaration about planning status.

If the authority decides that the development is not exempt, the next question may be whether to:

• redesign;
• make a normal planning application;
• apply for retention where the development already exists;
• or refer the declaration to An Coimisiún Pleanála.

Which route makes sense depends on the facts.

Referring a Section 5 declaration

If dissatisfied with the local authority’s declaration, the matter can be referred to An Coimisiún Pleanála under the statutory referral process.

An Coimisiún Pleanála’s current fee table lists an R1 referral — a person referring a declaration made by a planning authority — at €220.

The relevant time limit is important.

Cork City Council’s guidance states that a dissatisfied person may refer the declaration within four weeks of the date of the declaration.

Do not assume a late referral can be accepted.

What does An Coimisiún Pleanála do?

The Commission reviews the planning question referred to it and makes its own determination.

This can be especially important where:

• the exemption wording is disputed;
• planning history is complicated;
• a change of use is contested;
• or the local authority and property owner interpret the rules differently.

Can Section 5 fix unauthorised development?

Not necessarily.

A Section 5 declaration is about whether something is development/exempted development.

If work required permission and did not have it, calling it a Section 5 case does not transform it into authorised development.

The appropriate route may instead be retention planning permission.

Section 5 and protected structures

Protected structures require particular care.

A separate Section 57 declaration exists for owners or occupiers seeking clarity on works that would or would not materially affect the character of a protected structure.

That is not the same process as an ordinary Section 5 exempted-development declaration.

Where a protected structure is involved, use conservation-specific advice.

Section 5 and Architectural Conservation Areas

External works in an Architectural Conservation Area can lose ordinary exemption where they materially affect the character of the area.

A Section 5 declaration can be useful where the planning position is uncertain.

Do not assume that replacing windows, changing a roof or altering a facade is automatically exempt because the same work would be minor elsewhere.

Does a Section 5 declaration prove building-regulation compliance?

No.

It answers a planning question.

Building regulations, building control, structural compliance and title/legal issues are separate.

A development can be exempt from planning permission while still having to meet building regulations.

Buying a property: why Section 5 can matter

Suppose you are buying a house with a 30 m² rear extension.

There is no planning application.

Possible explanations include:

• it was exempted development;
• it predates the relevant planning controls;
• planning records are incomplete;
• or it is unauthorised.

A buyer should not guess.

Your solicitor and surveyor/engineer can investigate the history.

Where the exemption position needs a formal planning determination, Section 5 may be part of the solution.

Section 5 versus an architect’s opinion

Professional advice can be extremely valuable.

But an architect, engineer or planner does not issue the local authority’s formal statutory declaration.

In many normal transactions, professional compliance documentation may be sufficient.

In a disputed or uncertain case, a Section 5 declaration can provide a different level of planning certainty.

The right approach depends on the problem you are trying to solve.

Common mistakes

Asking too vague a question

The authority can only decide the question and facts put before it.

Omitting previous planning history

Earlier permissions or extensions can change the answer.

Assuming Section 5 is a retrospective permission

It is not.

Missing the referral deadline

If you want the Commission to review the declaration, statutory timing matters.

Confusing planning with building control

A favourable declaration does not certify structural or building-regulation compliance.

Frequently asked questions

What is a Section 5 declaration?

It is a formal declaration by a planning authority on whether a particular matter is development and, if it is, whether it is exempted development.

How much does a Section 5 declaration cost?

The current local-authority fee published by Cork City Council is €80.

Can I use Section 5 for an existing extension?

Yes, it can be used to determine the planning status of existing development where the question is whether it is development/exempted development.

What if the council says planning permission is required?

You may need a normal planning application or retention application, or you may refer the declaration to An Coimisiún Pleanála if you disagree.

How much is a Section 5 referral to An Coimisiún Pleanála?

The current R1 referral fee is €220.

Does a Section 5 declaration expire?

The declaration answers the question based on the facts and law considered. If the proposal changes or the legal framework changes, do not assume the old declaration automatically settles a different development.

The bottom line

Use Section 5 when the planning-status question is genuinely uncertain and the answer matters.

It is particularly valuable before:

• buying;
• selling;
• building;
• financing;
• or committing significant professional fees.

A formal answer before the project starts is usually easier to deal with than a planning dispute after the fact.