BER and planning permission when selling a house — two separate certificates, and where they meet

The seven Greater Dublin councils granted 93% of the 1,225 extension applications they decided in the 12 months to 12 September 2026, and each of those extensions changed the number on the house's Building Energy Rating. The two certificates a vendor hands over — the BER and the architect's opinion on compliance with planning permission — come from different statutes, different professionals and different registers. They meet in one place: the works.

What a BER is and when you need one

A Building Energy Rating is a certificate and an advisory report produced by a SEAI-registered assessor, grading a dwelling from A1 to G on calculated energy use per square metre per year. The obligation comes from the European Communities (Energy Performance of Buildings) Regulations 2006 (SI 666/2006), amended in 2012 (SI 243/2012). You need one to offer any dwelling for sale or rent, and since 9 January 2013 the rating must appear in the advertisement. The certificate lasts ten years, though a change to the building that affects the rating — an extension, a new boiler, external insulation — makes a fresh assessment the sensible course before you list.

The exemptions are narrow. A protected structure is exempt, a rule the 2012 Regulations kept because the works a BER would recommend are often the works section 57 of the Planning and Development Act 2000 forbids. Buildings under 50 m², temporary buildings, and places of worship are out. Everything else with a roof and a heating system is in. The certificate number is public on the SEAI National BER Register, and the advisory report — the list of measures that would improve the rating — goes to the vendor, who should hand it to the buyer.

Where the BER meets planning

The council does not read the BER. No planning condition in the register sets an energy rating, and a grant of permission for an extension says nothing about Part L. The link runs the other way: the works that planning permits are built under the Building Regulations, and Part L of those Regulations is the energy standard. Since the 2019 amendment (SI 292/2019) a new dwelling must reach the nearly zero-energy standard, which in BER terms is an A2, and a major renovation — works to more than 25% of the building envelope — must bring the whole dwelling to a cost-optimal level, in practice a B2.

That last rule is the one that surprises vendors. A large rear extension that wraps a 1970s semi can be a major renovation, and the Part L obligation then attaches to the old house as well as the new room. The assigned certifier's Certificate of Compliance on Completion, lodged on the BCMS for any extension over 40 m², is what says the standard was met. The buyer's solicitor asks for it beside the planning compliance opinion.

What the register adds to a BER

A BER assessor measures what is there. The register says whether it was allowed to be there. An A-rated extension with no permission and no exemption opinion is still an unauthorised structure, and the certificate of compliance guide sets out what happens next. Conversely, a permission on the register that the vendor never built — a second-storey extension granted in 2019 and left — tells a buyer what the house could become, and the five-year life of a permission says whether that option is still open.

Our reading, from the sales that stall on the register: order the BER and the planning compliance opinion in the same month, from people who talk to each other. The assessor will find the extension; the architect will need to explain it.

SEAI grants and permission

The SEAI's home-energy grants — attic and wall insulation, heat pumps, solar PV, the one-stop-shop deep retrofit — pay for works that rarely need planning permission. External wall insulation to the front of a house in an architectural conservation area is the exception; so is a heat pump unit visible from the street on a protected structure, and any solar array on a protected structure. Class 56 of Schedule 2 to the 2001 Regulations exempts rooftop solar on a house without an area limit since October 2022, subject to a 50 cm setback from the roof edge and the ACA and protected-structure restrictions in article 9. Check the constraints on the address before the grant application, not after.

Frequently asked questions

Do I need a BER to sell my house?

Yes. Since 1 January 2009 every dwelling offered for sale or rent needs a BER certificate and advisory report from a SEAI-registered assessor, and the rating must appear in the advertisement. Protected structures and buildings under 50 m² are exempt.

Does planning permission require a minimum BER?

No. The council decides an application on planning grounds. The energy standard is Part L of the Building Regulations, enforced through the building control system, and a new dwelling must reach the nearly zero-energy standard — an A2 in BER terms.

Does an extension change my BER?

Almost always. The certificate covers the dwelling as assessed; an extension, a new heating system or insulation changes the calculation. A works package that touches more than 25% of the envelope is a major renovation under Part L and must bring the whole house to a cost-optimal standard.

Is a BER the same as a certificate of compliance?

No. The BER is an energy rating from a SEAI assessor. The certificate of compliance is a professional opinion that the building was built in substantial compliance with its planning permission and the Building Regulations. A buyer's solicitor asks for both.

How long does a BER last?

Ten years from issue, unless the building changes in a way that affects the rating, in which case a new assessment is needed before the next sale or letting.

The certificate of compliance guide covers the planning half of the vendor's paperwork; the extension guide covers the 45 m² exemption. See the extensions decided on any street in the Explorer, or the Dublin City Council place page for the council's live grant rate.

Figures from the register on 12 September 2026 (live callouts refresh hourly); law checked 12 September 2026. Check with the council or a planning consultant before relying on this.