OCDEA Accreditation
An On Construction Domestic Energy Assessor (OCDEA) assesses new build properties from plans. They also assess homes undergoing major refurbishment, extensions or other new building work that requires Building Control approval.
OCDEAs are qualified to:
• Calculate SAP ratings
• Produce Building Regulations submissions
• Produce Energy Performance Certificates (EPCs)
UK law requires an EPC to be produced every time a home is constructed, sold or rented. This is a law that stems from the EU Energy Performance of Buildings Directive (EPBD). It says that EPCs can only be produced by “suitably qualified and/or accredited experts”.
Building Control must also confirm that an EPC has been produced before issuing the completion certificate.
All OCDEAs must be accredited and be members of an approved scheme before issuing EPCs. To become accredited, OCDEAs must obtain an approved qualification and join an accreditation scheme. Once accredited, OCDEAs are regularly audited and monitored by the accreditation scheme.
Who can join?
Any qualified OCDEA. You don’t need to have trained with NES and you can switch from another accreditation scheme at any time.
Benefits for OCDEAs
- Easy to use EPC software
You will get our easy-to-use, industry leading Plan Assessor software as well as the always-available NES one portal. Sign up for a fortnight’s free trial.
- Regional coverage
You will be able to produce EPCs and Building Regulations submissions for England & Wales, Scotland and Northern Ireland.
- Comprehensive insurance
If you do not already have insurance cover, you will be able to use our scheme Professional Indemnity insurance.
- Business support
You will benefit from our promotion of your services to potential clients, networking support and other business assistance. Take a look at our Find an Assessor service.
- Volume discounts
As you register more EPCs during your membership of the scheme the cost per report will reduce. For more details click here.
- On-demand technical support
You will have access to a dedicated Technical Support team to answer your queries – whether they are about our software systems, about the SAP conventions, Building Regulations, zero carbon, the Code for Sustainable Homes or about your business. For more details click here.
- Technical Bulletins
You will receive regular copies of our Technical Bulletins keeping members abreast of legislation, methodology conventions and tips on using our software. Click here for a sample bulletin.
- CPD support
You will be given full CPD support and advice, including reduced rates on NES training courses. Browse our training and CPD courses here.
- Monitoring and compliance support
You will be supported throughout our monitoring and compliance checks, secure in the knowledge that your EPCs, PEAs and Building Regulations submissions are quality assured.
- Marketing support
You will receive logos for use on websites, stationery and other branded items.
- Networking events
You will get advance invitation to NES events and conferences. Check the latest events here.

Our Registration Services team
Julia Turner is registration services co-ordinator for NES. The team manage your application process and your ongoing membership of the scheme.
We can answer any queries you may have about membership - call us on 01908 442277.