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Freight and retrofit

Clean vehicle retrofit accreditation scheme

The scheme certifies retrofit technologies that meet UK Government standards.

The clean vehicle retrofit accreditation scheme (CVRAS) supports the operation of clean air zones (CAZ). The aim of the scheme is to address the air pollution emissions from buses, coaches, heavy goods vehicles, mini-buses, taxis and vans. To learn more about CVRAS, download a free copy of Zemo Partnership’s Clean vehicle retrofit technology guide.


Our guide below will answer many of the questions you might have on the clean vehicle retrofit accreditation scheme (CVRAS), low emission zones (LEZ), clean air zones (CAZ) and London’s ultra low emission zone (ULEZ).

CVRAS Register

The CVRAS Register contains approved and CAZ compliant companies and emission reduction systems, based on make, model and engine type.

Download a full list of approved manufacturers and devices, or a list of products the respective company no longer wants to be listed as available to the market.

CVRAS retrofit vehicle type overview

Get CVRAS certified

Manufacturers of abatement equipment must get approved by CVRAS before it can be added to the list of approved devices available to vehicle and CAZ scheme operators.

Emission reduction systems will need to demonstrate robust technical performance before they can be approved. Manufacturers will also need to have quality management systems to certified, for example, ISO 9001. Please see the scheme documentation below for further details.

CVRAS application forms

Additional information

Contact us

For more information on the Clean Vehicle Retrofit Accreditation Scheme (CVRAS), email us at


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Last updated: 25 October 2023