Get a BER certificate before moving into your new home

Arrange your Building Energy Rating (BER) certificate and advisory report before you move into your self-build, unless a statutory exemption applies. Book an independent registered assessor early enough to check the finished house and publish the result before first occupation.

The rating uses a scale from A0 to G. Your lender may ask for it, and you will need it if you later sell or let the house. Agree the design checks, evidence and assessment timetable with your designer and assessor alongside the building regulations and completion-certificate process.

Who must get a BER, and by when

If you commission a new dwelling with construction starting on or after 9 January 2013, the Energy Performance of Buildings Regulations 2012 require you to secure the BER certificate and advisory report before first occupation. As a self-builder, you commission the house, so you hold that responsibility. Agree explicitly who will arrange the assessment if your builder or architect offers to do it for you.

These duties apply unless a statutory exemption applies (see below). Three points follow:

• The deadline is first occupation. Not the day you complete, and not the day you apply for a mortgage drawdown. If you intend to move in, you need the certificate before you do.
• It is a certificate and a report. The BER certificate shows the rating. The advisory report accompanies it and contains recommendations for the cost-optimal or cost-effective improvement of the building’s energy performance. Both are held on the BER register.
• Enforcement sits with the building control authority. The regulations allow the building control authority, or an authorised officer, to demand from the owner or an agent a printed copy of the BER certificate and advisory report required for a dwelling. Contravening the relevant provisions is an offence.

Provisional BER and final BER

A provisional BER certificate rates your proposed house from its plans and specifications, before construction is complete. It is held on the BER register.

A provisional BER is valid for a period not exceeding 24 months from the date of issue. That matters for a self-build, because a build can run past two years. If you still need a provisional certificate, for example to market the unfinished house, arrange a replacement before relying on an expired one. You still need the final assessment of the completed house.

The final BER rates the completed house and must account for changes from the plans and specifications used for the provisional assessment. A different window supplier, heating system or insulation product can change the result, as can the measured airtightness. Tell your assessor about substitutions as they happen. Keep the product data sheets so the assessment reflects what was built.

If a new BER is issued within the validity period of an existing one, the existing one is deemed revoked. That means the final BER automatically replaces the provisional one on the register.

How long a BER lasts

A BER certificate and advisory report are valid until 10 years from the date of issue. They are rendered invalid earlier if there is a material change to the building that could affect its energy performance. The regulations give three examples:

1. any significant deterioration in the fabric of the building;
2. any extension of the building; or
3. any change in the heating system, or in the type of fuel it uses.

So the BER you obtain at completion is not a lifetime figure. If you extend within the ten years, or swap an oil boiler for a heat pump, the old certificate stops being valid and a new assessment is needed before you rely on it, for example when selling.

Who does the assessment

Use an independent BER assessor registered with the Sustainable Energy Authority of Ireland (SEAI) for dwellings. SEAI is the Issuing Authority: it maintains the assessor register within the regulations’ accredited-training framework and can suspend or terminate registrations. Before you book:

• Use someone who appears on the register for dwellings. Ask for their registration number and check it before paying.
• A BER is calculated from the data the assessor is given, using the Issuing Authority’s specified procedures, calculation methodology and software. An assessor who is only given the drawings may be missing the manufacturer’s data that improves a rating, so hand over the specification, U-values (which measure heat loss through materials), window data, the heating and ventilation design and the airtightness result when you have it.
• The assessor works from the house as designed and built. They do not design it for you, and a poor rating found late is expensive to correct. Ask your designer to run a provisional assessment during design, so you find out about a shortfall while it is still a drawing.

The link to Part L and nZEB

Part L sets minimum energy-performance requirements; the BER records assessed energy performance using standard assumptions. Your designer follows the current Part L, not older versions: see the nearly zero energy building (nZEB) and Part L guide.

For a self-builder the sequence is:

1. The designer designs to Part L. The assessor can run a provisional BER on the design.
2. Arrange compliance evidence and inspections for your building-control route. An assigned certifier coordinates the statutory inspection/certification process where it applies. An eligible single dwelling may opt out of the assigned-certifier route (see the assigned certifier guide); that does not remove Building Regulations or BER duties.
3. A final BER is secured before first occupation.

Do not treat a good BER as proof of compliance with Part L, or the reverse. They are separate obligations with separate evidence.

If you later sell or rent

If you offer the house for sale or letting, you and any agent acting for you must produce a printed copy of the BER certificate and advisory report to anyone expressing an interest in buying or renting. If you market the house under construction on the basis of its plans, supply the provisional certificate and report. Once the house is finished, supply the final BER to the purchaser or tenant before completing the sale or letting.

Include the current certificate’s energy performance indicator (the A0 to G rating on the certificate, with its kWh/m²/yr figure) in sale or letting advertisements, displayed according to SEAI’s guidance. This covers newspapers, brochures, leaflets, advertising notices, radio, television, websites, social media and direct mail in print or email. Your solicitor or estate agent has duties as your agent, but you also remain responsible as the person offering the property.

Check whether an exemption applies

The regulations do not apply to certain categories of building. The list includes national monuments, protected structures and proposed protected structures, places of worship, temporary buildings, certain industrial and non-residential agricultural buildings with low installed heating capacity, and a stand-alone building with a total useful floor area of less than 50 square metres. A typical new family house will not qualify. Ask your assessor to check the exact statutory category and floor area if your project includes a small detached outbuilding, protected structure or another potentially exempt building.

Put the assessment into your build programme

• Design stage: ask your designer or an assessor for a provisional BER to test the design against the rating you want and against Part L. A provisional BER also helps if a lender or valuer asks for energy information.
• During construction: keep records of what is actually installed, including product data sheets and the airtightness test result. Note any substitutions for the assessor.
• Before completion: book the final assessment and agree the evidence and publication timetable with your assessor. Coordinate with any completion-certificate process and your lender’s requirements; the BER deadline is before first occupation, not a universal completion-certificate submission date.
• After you move in: keep the certificate with the house documents. It lasts 10 years unless an extension or heating change invalidates it.

Reading a certificate issued before or after May 2026

From 24 May 2026, the simplified scale uses A0, A, B, C, D, E, F and G, replacing the earlier subcategories such as A1 and B2. A0 is for highly efficient buildings without fossil-fuel use. SEAI explains the change in its simplified-scale guidance.

The change alone does not invalidate an older certificate: the 2026 regulations preserve existing certificates and records. The usual expiry and material-change rules still matter. If your lender specifies an older rating such as A2, ask it how it applies that condition to the new certificate.

Agree the fee and collect both documents

Use SEAI’s assessment guidance to find a registered assessor, agree a written quote and timetable, and prepare the evidence. Engage the independent assessor directly. Keep specifications, product certificates, test results and records of substitutions; missing evidence can lead to conservative defaults.

The assessor submits the assessment data to SEAI and issues the certificate and advisory report after acceptance into the national register. Keep both documents and their supporting evidence with your house records. Assessment fees vary: compare written quotes and check whether VAT, publication and any return visit are included.