Requirements for building regulations compliance in Ireland in 2026

Building regulations in Ireland set the minimum standards for the design, construction and materials used in new buildings, extensions, conversions and certain refurbishments. Compliance is not optional — it is a legal requirement under the Building Control Acts 1990–2014 and the associated Building Control Regulations.

Since the introduction of the Building Control (Amendment) Regulations 2014 (commonly called BCAR), the compliance framework has placed formal responsibilities on owners, designers and builders. Understanding which documents you need, who must sign them and where to submit them will save you time and help you avoid costly delays.

What this procedure is and what it’s for

Building regulations compliance is the process by which a building owner, developer or contractor demonstrates that a construction project meets the technical standards set out in the Building Regulations 2023 (as amended). These standards cover structural safety, fire safety, energy performance, accessibility, drainage, ventilation and more.

The procedure applies to:

• New dwellings and commercial buildings
• Extensions above 40 m² (and some smaller extensions depending on use)
• Material changes of use (e.g. converting a commercial unit to residential)
• Material alterations to an existing building
• Works to a protected structure (additional planning consent is also required)

The official body responsible for building control enforcement is the Building Control Authority (BCA) in each local authority area. There are 31 local authorities across Ireland, each operating its own Building Control section. The national framework is overseen by the Department of Housing, Local Government and Heritage, and the statutory online portal is the Building Control Management System (BCMS) at bcms.ie.

For most projects covered by BCAR, a Commencement Notice must be submitted at least two weeks before works begin. Larger or higher-risk projects require a Certificate of Compliance on Completion signed by an assigned certifier.

Documents required

The documents you need depend on the type and scale of the project. The following list covers the standard requirements for a new dwelling or significant extension under BCAR.

Documents submitted via BCMS before works begin

• Commencement Notice (completed online through BCMS; no paper form accepted)
• Notice of Assignment of a Builder — signed by the building owner, naming the main contractor
• Notice of Assignment of an Assigned Certifier — signed by the building owner, naming the registered professional (architect, engineer or building surveyor on the CIRI or RIAI register) who will inspect and certify the works
• Undertaking by Builder — signed by the builder, confirming they will comply with building regulations
• Undertaking by Assigned Certifier — signed by the assigned certifier, confirming they will inspect and certify
• Design Certificate — signed by the designer of record, confirming the design complies with the Building Regulations
• Drawings and specifications — plans, sections, elevations and a written specification sufficient to demonstrate compliance (originals or certified copies; scale must be clearly stated)
• Planning permission — a copy of the grant of planning permission and any conditions attached (original or certified copy)
• Fire safety certificate (where required — mandatory for most buildings other than single dwellings) — application submitted separately to the BCA
• Disability access certificate (where required — mandatory for certain building types) — application submitted separately to the BCA

Documents required on completion

• Certificate of Compliance on Completion — signed by both the assigned certifier and the builder; submitted through BCMS
• Inspection plan — record of all inspections carried out during construction
• As-built drawings — updated drawings reflecting any changes made during construction
• Evidence of compliance — test results, certificates of conformity for products, thermal calculations (e.g. DEAP energy rating certificate from a BER assessor registered with SEAI)
• Building Energy Rating (BER) certificate — mandatory for new dwellings; issued by an SEAI-registered BER assessor

Notes on documents

• All BCMS submissions must be made in the name of the registered building owner.
• The assigned certifier and builder must be registered on the relevant statutory registers before they can sign statutory forms.
• Documents in a language other than English or Irish must be accompanied by a certified translation.
• Originals of signed undertakings and certificates must be retained by the building owner for a minimum of six years after completion.

Steps to complete the procedure

1. Confirm whether your project requires a Commencement Notice. Check with your local authority’s Building Control section or use the BCMS guidance notes. Exempted developments (e.g. small domestic extensions under 40 m²) may not require a formal BCAR submission, but all works must still comply with the Building Regulations.

2. Appoint an assigned certifier and a builder. Both must be registered professionals. The assigned certifier is typically a chartered architect, chartered engineer or registered building surveyor. Confirm their registration status before signing any appointment.

3. Prepare your design documentation. Your designer produces drawings and a specification demonstrating compliance with the relevant parts of the Building Regulations (Parts A–M and Part L for energy). A Design Certificate is signed at this stage.

4. Apply for a fire safety certificate and/or disability access certificate if required. These are separate applications to your local BCA and must be submitted before or alongside the Commencement Notice. Allow additional time for these approvals.

5. Submit the Commencement Notice through BCMS. Go to bcms.ie, create or log in to your account, and upload all required documents. The notice must be submitted at least two weeks and no more than four weeks before works begin.

6. Receive acknowledgement from the BCA. The local Building Control Authority reviews the submission. They may carry out an inspection at any stage during construction. You do not need to wait for explicit approval before starting — the two-week period is a mandatory notice period, not an approval process.

7. Carry out works in accordance with the approved design. The assigned certifier carries out inspections at agreed stages (foundations, structure, insulation, airtightness, etc.) and records these in the inspection plan.

8. Obtain a BER certificate. A SEAI-registered BER assessor carries out an energy assessment on completion and issues the BER certificate. This is mandatory for new dwellings before the Certificate of Compliance on Completion can be submitted.

9. Submit the Certificate of Compliance on Completion through BCMS. The assigned certifier and builder both sign the certificate. Upload all supporting documentation (as-built drawings, inspection records, test results, BER certificate). The BCA validates the submission and registers the certificate.

10. Retain all records. Keep originals of all signed certificates, drawings and test results for at least six years. These documents are essential if you sell the property or need to demonstrate compliance in the future.

Where the procedure is done: All statutory BCAR submissions are made online through bcms.ie. Fire safety certificate and disability access certificate applications are submitted directly to the local authority’s Building Control section (in person, by post or online depending on the local authority). No appointment is required for BCMS submissions, but contacting your local BCA before starting a complex project is strongly advised.

Estimated time: The Commencement Notice takes effect two weeks after submission. Fire safety certificate applications typically take two months to process. Disability access certificate applications typically take four to eight weeks. Certificate of Compliance on Completion registration is usually completed within a few working days of a complete submission.

Fees and timelines

• Commencement Notice fee: €30 per dwelling unit (for residential projects); commercial projects are charged based on floor area — typically €30 per 100 m² or part thereof, subject to a minimum of €30 and a maximum of €12,500. Fees are paid online through BCMS.
• Fire safety certificate fee: Based on the estimated cost of works — typically 1% of the cost of works up to €100,000, with a sliding scale above that; minimum fee is €125. Paid to the local Building Control Authority.
• Disability access certificate fee: €800 for a new application; €400 for a revision. Paid to the local Building Control Authority.
• BER assessment fee: Set by the assessor; typically €150–€300 for a standard dwelling.
• Processing time for Commencement Notice: The two-week notice period is mandatory; there is no formal approval decision — works can begin after 14 days.
• Processing time for fire safety certificate: Approximately two months from a valid application.
• Processing time for disability access certificate: Approximately four to eight weeks from a valid application.
• Processing time for Certificate of Compliance on Completion: Typically three to five working days once a complete submission is made through BCMS.
• Validity of Certificate of Compliance on Completion: Once registered, the certificate is permanent and is attached to the property record. It does not expire.
• Duration of a Commencement Notice: Works must begin within the four-week window following submission. If works do not commence, a new Commencement Notice must be submitted.

Common mistakes and how to avoid them

• Submitting an incomplete Commencement Notice. BCMS will not accept a submission unless all required documents — including the Design Certificate, undertakings and planning permission — are uploaded. Check the BCMS document checklist before submitting to avoid rejection and delays to your start date.

• Appointing an unregistered certifier or builder. The assigned certifier must appear on a statutory register (RIAI, Engineers Ireland, SCSI or CIRI). If they are not registered at the time of signing, the statutory forms are invalid and the entire submission must be redone. Verify registration before signing any appointment documents.

• Starting works before the two-week notice period has elapsed. Commencing works before the 14-day period is a criminal offence under the Building Control Acts. The BCA can issue an enforcement notice and require works to stop. Always check the date on your BCMS acknowledgement before mobilising on site.

• Failing to submit the Certificate of Compliance on Completion before selling or letting the property. Without a registered certificate, a property cannot be sold or let in most circumstances, as solicitors and financial institutions require it as part of the conveyancing process. Do not leave this step until after the sale is agreed — it can take time to gather all supporting documentation.

Frequently asked questions

Do I need to comply with BCAR for a small house extension?

It depends on the size and nature of the works. Extensions under 40 m² to an existing dwelling are generally exempt from the full BCAR Commencement Notice process, but they must still comply with the Building Regulations. For extensions over 40 m², or any extension that involves a change of use or affects fire safety, a Commencement Notice is required. Contact your local Building Control Authority if you are unsure.

Who can act as assigned certifier on my project?

The assigned certifier must be a registered professional — typically a chartered architect registered with the RIAI, a chartered engineer registered with Engineers Ireland, or a registered building surveyor registered with the SCSI. They must also be registered on the BCMS system. You can verify registration through the relevant professional body’s public register.

What happens if I carry out works without submitting a Commencement Notice?

Carrying out works that require a Commencement Notice without submitting one is an offence under the Building Control Acts 1990–2014. The local Building Control Authority can issue an enforcement notice requiring you to stop works, apply for regularisation or even demolish unauthorised structures. Regularisation is possible in some cases but involves additional fees and inspections.

Is a BER certificate always required?

A BER certificate is mandatory for all new dwellings before the Certificate of Compliance on Completion can be registered. It is also required when selling or renting any existing dwelling or commercial property. BER assessors must be registered with SEAI. The certificate is valid for 10 years unless significant energy-related works are carried out.

Can I submit BCMS documents myself, or do I need a professional?

The building owner can create a BCMS account and initiate a submission, but the statutory certificates and undertakings must be signed by the assigned certifier, the designer and the builder — all of whom must be registered professionals. In practice, most owners rely on their assigned certifier to manage the BCMS submission on their behalf.

What to do next

The most important first step is to appoint a registered assigned certifier before any design work is finalised. They will guide you through the BCMS submission, coordinate the fire safety and disability access certificate applications, and manage the inspection process during construction.

Before you start, confirm the specific requirements for your project with your local authority’s Building Control section — requirements can vary slightly depending on the nature of the works and the local authority area.

Requirements can change. Always verify the current documents, fees and procedures directly with your local Building Control Authority or through the official BCMS portal at bcms.ie and the Department of Housing, Local Government and Heritage at gov.ie/housing.