Certificate of Conformity (CoC) for ULEZ, CAZ and LEZ
Last updated November 1st, 2023
High-polluting cars travelling in designated areas within certain UK cities are subject to daily fees.
Schemes such as the Ultra Low Emission Zone (ULEZ) in London, the Clean Air Zones (CAZ) (operating in cities such as Bath, Bradford, Bristol, Portsmouth and Sheffield) - and the Low Emission Zones (LEZ) in London and Glasgow utilise ANPR cameras to detect vehicles that don’t meet certain minimum emissions standards.
If you plan to drive within any of these areas, you may need to obtain a Certificate of Conformity (COC) to prove your vehicle’s compliance and avoid the fees. In this guide, we will define a CoC. We’ll also explain where to find yours – and how to replace it if it goes missing.
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What is a Certificate of Conformity (CoC)?
Put simply, a CoC is a physical document that is issued by a vehicle manufacturer confirming that a vehicle complies with European regulations. The minimum standards for exemption from ULEZ charges (and charges for the similar CAZ and LEZ schemes) are as follows:
- Euro 4 for petrol vehicles.
- Euro 6 for diesel vehicles.
Hybrid cars and mild hybrid cars featuring a petrol or diesel powertrain are also subject to the same requirements. All fully electric cars are exempt from the charges, as they do not produce CO2 emissions.
For more information, visit our guide to ULEZ exempt cars.
Why do you need a Certificate of Conformity (CoC)?
Once you obtain a CoC, you can prove that your vehicle meets the requirements to travel in various emission-based chargeable zones (i.e. ULEZ, CAZ and LEZ) without paying the daily fees.
How do I get a Certificate of Conformity (CoC)?
Typically speaking, a CoC is free when you purchase a new vehicle and can be found in the glove compartment.
However, when buying a used car, you can request a copy of the CoC if you did not receive one with the vehicle.
You can apply for a replacement CoC online or through an accredited registrar. Alternatively, you can check with the manufacturer to see whether they offer a Certificate of Conformity service.
How much does a Certificate of Conformity cost?
A CoC is free of charge when you purchase a new vehicle. However, there is often a fee for obtaining a replacement CoC - and this cost will vary depending on the manufacturer.
Certificate of Conformity replacement by manufacturers list
Here is a quick guide showing where to request replacement CoCs from leading car manufacturers online and the fees which apply:
Our list covers some of the most popular manufacturers on the UK market but is not exhaustive. If your car’s manufacturer is not listed on the table, simply search for their name online and the information should be readily available on their website.
How long is a Certificate of Conformity valid?
There is no specific time limit on a CoC unless any modifications have been made to the vehicle which would impact its emissions.