EPCs for New Builds

New-build homes receive an EPC based on their as-built construction and systems, assessed against building regulation energy requirements in the relevant jurisdiction. Unlike an existing-home EPC, which models a home as found, a new-build EPC is closely tied to design calculations, construction details, and compliance evidence, and it is produced as part of the completion process. Buyers should expect an as-built certificate, not merely a design-stage prediction, and should check that it matches the home as completed.

The distinction between design and as-built matters. A design-stage rating predicts performance from plans and specifications, while an as-built rating reflects what was actually built, including any specification changes, construction variations, and commissioning results. A home that changed boiler, glazing or insulation during construction may therefore have a different as-built rating from its design prediction, and the as-built document is the one to rely on.

For new builds, energy assessment starts at design, with calculations showing compliance with building regulation energy targets, and continues through construction, with evidence of insulation, airtightness, heating and ventilation as built. Airtightness testing, where required, and commissioning of heating and ventilation systems form part of that evidence, and the assessor uses as-built data, not just design intent, to produce the final certificate.

Buyers receive the as-built EPC as part of handover, alongside manuals, guarantees and commissioning records. That pack should be checked together: does the EPC's heating system match the boiler or heat pump installed, does its glazing match the windows fitted, and do its controls match the programmer and thermostats handed over? Inconsistencies should be queried with the developer before completion, while snagging can still address them.

Check that the EPC is as-built, dated after completion, and lodged on the relevant register for the correct address, including plot and flat number where applicable. Check its inputs against the home as viewed: wall and roof construction as far as visible, window type, heating system, controls, and any renewable equipment such as solar panels or heat pumps.

Check handover information alongside the EPC: heating and ventilation manuals, control instructions, guarantees, and airtightness or commissioning results where provided. A new home's performance depends on occupants understanding its controls and ventilation, especially where mechanical ventilation or heat pump controls differ from familiar boiler controls, and handover should explain those systems clearly.

In the UK, new-build EPCs follow building regulation routes that differ by nation, with England, Wales, Scotland and Northern Ireland each setting energy targets and assessment procedures for new homes. A buyer should check the building regulation and EPC arrangements for the nation where the home stands, rather than assuming a single UK new-build process, and should note that Scotland's new-build certificate format and context differ.

In EU member states, new-build energy performance is governed by national building codes under the EPBD framework, with nearly zero-energy building standards applying to new construction in most countries. Certificate formats, class scales and compliance evidence vary nationally, so a new-build certificate from one country should not be read as if produced under another country's new-build rules, even where the home type looks similar.

One new-build mistake is accepting a design-stage rating as if it were the final certificate. Marketing material may quote a predicted rating or band, but only the as-built certificate, lodged after completion, is the official record, and relying on a prediction for a purchase decision risks a gap between promise and built reality. Ask for the as-built certificate explicitly.

Another mistake is ignoring handover and commissioning for a new home's systems. A heat pump, mechanical ventilation system, or zoned control system left on default settings, without occupant instruction, will underperform regardless of its as-built rating. Handover, commissioning records and control instruction are part of new-build performance, not administrative extras, and they should be checked at completion.

Keep the as-built EPC, design calculations where provided, airtightness and commissioning results, manuals, guarantees, and snagging records, with purchase paperwork. That file supports future sales, warranty claims, and any later retrofit planning, because it records the home as built, not as marketed.

Ask the developer or assessor whether the EPC is as-built, what changed from design stage, and how heating, ventilation and controls should be operated. Ask a solicitor or conveyancer what new-build energy documents are required for your jurisdiction and purchase type. This guide is educational, not conveyancing advice.