Energy Assessor Qualifications: Who Can Issue an EPC?

Before you can market your property for sale, you need a valid Energy Performance Certificate. But not just anyone can produce one. The EPC must be created by a qualified and accredited Domestic Energy Assessor (DEA) who is registered with one of the government-approved certification schemes. Booking the wrong person — or someone who lacks the correct accreditation — can leave you with a document that has no legal standing, wasting time and money just when you can least afford it.

This guide explains who is authorised to issue EPCs in England and Wales, what qualifications they must hold, how the accreditation schemes work, and how you can verify that an assessor is legitimate before you book. For a broader overview of the certificate itself, see our guide on EPC certificates explained.

The legal framework for EPC production

The right to produce EPCs in England and Wales is governed by the Energy Performance of Buildings (England and Wales) Regulations 2012. Under these regulations, an EPC is only legally valid if it is:

• produced by an accredited energy assessor who holds the appropriate qualification for the property type; and
• lodged on the official EPC Register at epcregister.com immediately after production.

A certificate that is not lodged on the register cannot satisfy your legal obligation to provide an EPC before marketing. Your estate agent is required to attach the register entry — or the EPC rating drawn from it — to the property listing. This is why the assessor's accreditation matters: without it, the certificate simply cannot be lodged.

The regulations are enforced by local authority trading standards teams. Sellers who market without a valid EPC can face a civil penalty of up to £500. Estate agents who list a property without displaying the EPC rating can face higher penalties. Getting a qualified assessor is therefore not a formality — it is a genuine legal requirement that protects you from enforcement action.

What qualification does an energy assessor need?

To assess existing residential properties and produce EPCs using the Reduced Data SAP (RdSAP) methodology, an assessor must hold the Domestic Energy Assessor (DEA) qualification. This is the standard credential for the vast majority of EPCs produced for property sales.

DEA qualification requirements

The DEA qualification is obtained by completing a training programme accredited by one of the certification schemes, covering:

• the RdSAP assessment methodology and how data is collected on site
• building construction types, including how to identify wall, roof, and floor construction from observable features
• heating and hot water systems — boiler types, efficiency ratings, and heating controls
• glazing types, renewable energy systems, and lighting assessment
• professional conduct, data accuracy, and legal responsibilities

Training is typically delivered over a few days, followed by a written examination and a practical assessment of the candidate's ability to complete a lodgement using RdSAP software. Once qualified, the assessor must register with a certification scheme before they can lodge any EPCs. The scheme carries out a quality audit of the assessor's first lodgements to verify competence.

OCDEA qualification for new-build properties

An On Construction Domestic Energy Assessor (OCDEA) holds an extended qualification that allows them to produce EPCs for new-build dwellings using full SAP calculations. New-build EPCs are based on design and specification data rather than an observable site visit, and require more detailed technical input. If you are selling a recently completed new-build property and need to check the original EPC, it will have been produced by an OCDEA. For a resale, a standard DEA assessment is all you need.

Government-approved certification schemes

After qualifying, an assessor must join one of the government-approved certification schemes. The scheme acts as the assessor's professional body: it issues their registration number, audits their work, and provides access to the lodgement software that connects to the EPC Register. The five approved schemes in England and Wales are:

All five schemes are approved by the Secretary of State and operate under the same regulatory framework. An EPC produced by an assessor from any of these schemes carries equal legal weight. There is no “better” or “worse” scheme from the seller's perspective — what matters is that the assessor is registered with one of them and that their registration is current.

How to check an assessor's credentials

Before booking an energy assessor, you should verify that they hold current accreditation. There are two straightforward ways to do this:

1. Search the EPC Register

Go to epcregister.com and search for any previous EPC lodged by the assessor. You can do this by searching for your own property's postcode and viewing any existing certificate, which will show the assessor's name and certification scheme. If you do not yet have an EPC, ask the assessor for their registration number and check it on the register directly.

2. Check the scheme's member register

Each of the five approved schemes maintains a publicly searchable database of current members. If an assessor provides you with their certification scheme membership number, go to that scheme's website and confirm their status is active. This takes less than two minutes and gives you independent confirmation that the assessor is currently authorised to lodge EPCs.

A legitimate DEA will have no hesitation in providing their certification scheme name and membership number. If an assessor is evasive about their credentials, treat this as a warning sign and look elsewhere.

What the assessor's site visit must include

A valid EPC can only be produced following a physical inspection of the property. The RdSAP methodology requires the assessor to observe and record specific building features in person. Desktop or remote assessments — where an EPC is produced from photographs, floor plans, or verbal descriptions alone — are not legally valid under the Energy Performance of Buildings Regulations.

During the visit, the DEA will inspect and record:

• Wall construction — cavity or solid, and whether insulation is present
• Roof and loft insulation — type and estimated depth
• Windows — glazing type (single, double, or triple) and approximate age
• Heating system — boiler type, fuel, age, heating controls, and programmer
• Hot water provision — cylinder type and insulation, or combination boiler
• Lighting — proportion of fixed low-energy lighting fittings
• Renewable energy — solar PV panels, solar thermal, heat pumps, or other on-site generation
• Floor area — measured or estimated from floor plans

The visit typically takes 30 to 60 minutes for a standard three-bedroom house. Larger or more complex properties may take longer. The assessor then enters the data into approved RdSAP software, calculates the energy efficiency rating, and lodges the EPC on the register.

Quality standards and auditing

Each certification scheme is required to audit a sample of their assessors' lodgements to check that EPCs are being produced accurately and in accordance with the RdSAP methodology. Where an audit reveals errors or inconsistencies, the scheme is required to take remedial action — which may range from requiring the assessor to redo an assessment to suspending or removing their registration.

Assessors are also required to keep records of each assessment, including site notes, photographs, and the data entered into the software. These records must be retained so that the assessment can be audited or reviewed if a complaint arises. If the certification scheme requests an audit file, the assessor is obliged to provide it.

Continuing professional development (CPD) is another requirement. Assessors must keep up to date with changes to the RdSAP methodology, updates to the SAP software, and any regulatory changes. This is particularly important when methodology revisions are introduced — the most recent update, SAP 10.2, changed how grid electricity is weighted, which affected the ratings of electrically heated properties.

How much should you pay?

A standard EPC for a residential property in England and Wales typically costs between £60 and £120. Prices vary by location, property size, and assessor. Larger or more complex properties may attract a slightly higher fee. In competitive urban markets, some assessors charge towards the lower end of this range; in rural areas with fewer assessors, prices may be higher.

You can find accredited DEAs through:

• the EPC Register's “find an assessor” tool at epcregister.com
• direct searches on the certification scheme member registers
• your estate agent, who may include the EPC as part of their marketing package (confirm they are sub-contracting to an accredited DEA)
• comparison sites that aggregate local assessor prices

Be cautious of prices significantly below £50. While this is not impossible in highly competitive markets, a very low price can indicate that corners are being cut on the quality of the assessment — for instance, using default assumptions rather than checking actual features. An inaccurate EPC could under-rate your property, affecting how buyers perceive it. The EPC cost should be viewed alongside other selling costs; for a full picture, see our guide on the hidden costs of selling a house.

Raising a complaint about an assessor

If you believe an EPC has been produced inaccurately — for example, the assessor recorded features incorrectly, which led to a lower rating than your property deserves — you have a formal route of redress.

1. Contact the assessor directly. Explain your concerns and ask them to review the lodgement. Provide any evidence you have, such as installation certificates for insulation or a boiler service record showing the boiler's age and type.
2. Escalate to the certification scheme. If the assessor does not resolve the issue, raise a formal complaint with their scheme. Each approved scheme is required to operate an independent complaints procedure with defined timescales for investigation and response.
3. Request a revised certificate. If the scheme investigation finds the assessment was inaccurate, the assessor may be required to reassess the property and lodge an amended EPC at no additional cost to you.

Assessors who are found to have produced inaccurate or fraudulent EPCs can be suspended or permanently removed from their scheme register. Deliberately falsifying an EPC — for example, recording insulation that does not exist — is a criminal offence under the regulations.

EPCs and the broader sale preparation process

The EPC is one of several documents you should have in place before marketing your property. Understanding who can produce it — and how to verify their credentials — is part of making sure your sale does not hit unnecessary delays. Before booking an assessor, check your current EPC to see whether you already have a valid certificate. An invalid EPC discovered after you have already agreed a sale price is a problem that can undermine buyer confidence and slow down the legal process.

The EPC sits alongside your solicitor's paperwork as part of a well-prepared property pack. To understand what else needs to be ready before exchange of contracts, see our guide on what is a property certificate pack. For the legal disclosure forms your solicitor will ask you to complete, see our guide on what is a TA6 form.

Pine is built around the principle of front-loading your sale preparation — getting the EPC, the legal forms, and the searches in order before a buyer arrives, so that conveyancing moves quickly once an offer is accepted. Choosing a qualified, accredited energy assessor is the first step in that process.

Sources

• Energy Performance of Buildings (England and Wales) Regulations 2012 — legislation.gov.uk
• GOV.UK — Energy Performance Certificates: guidance for sellers and landlords
• EPC Register — epcregister.com
• Elmhurst Energy — DEA certification and scheme information (elmhurstenergy.co.uk)
• ECMK — Domestic Energy Assessor accreditation scheme (ecmk.co.uk)
• Quidos — Energy assessor certification scheme (quidos.co.uk)
• Stroma Certification — DEA accreditation (stroma.com)
• CIBSE Certification — Energy assessor accreditation (cibsecertification.co.uk)
• BRE — Reduced Data Standard Assessment Procedure (RdSAP) methodology documentation
• Department for Energy Security and Net Zero — Energy Performance of Buildings statistics

Related guides

• Does Your EPC Rating Affect Council Tax?

Frequently asked questions