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★ Key takeaway
UK hire car companies pass CAZ daily charges plus an admin fee to renters whose vehicles enter zones such as London ULEZ (£12.50), Birmingham (£8) or Bristol (£9). Avis, Hertz, Enterprise, Sixt and Europcar typically charge £10 to £25 admin per incident. Renters should request a compliant vehicle at pickup and challenge any charge raised on a Euro 6 diesel or Euro 4 petrol car. |
UK car rental companies are the registered keepers of their fleet vehicles and therefore receive any Penalty Charge Notice or daily Clean Air Zone charge generated when a hirer enters a charging zone. The standard practice across Avis, Hertz, Enterprise, Sixt, Europcar and Budget is to pay the underlying daily fee on behalf of the customer, then bill the customer for the original charge plus an admin or processing fee. Renters need to understand who pays, what admin fees apply, what the rental contract says about emissions charges, and how to dispute a charge raised in error on a compliant vehicle. This guide covers the rental company practice, contract clauses, refund routes and pickup checks for 2026.
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How rental companies bill CAZ daily charges
When a hirer drives a rental car into a UK Clean Air Zone in a non-compliant vehicle, the daily charge is automatically detected by ANPR cameras and billed against the registered keeper, which is the rental company. Each major UK rental company has a back-office process: the charge is paid promptly to avoid a PCN, and the rental company then bills the original hirer using the card on file from the rental booking. The pass-through includes the original daily charge (£8, £9, £12.50 or whatever the city sets) plus the rental company's admin or processing fee.
According to published UK rental terms, Hertz typically charges £25, Sixt £25, Avis £15 to £25, Enterprise £10 to £25, and Europcar £42 per incident as the admin component, on top of the daily charge itself. The combined cost of one zone entry in a non-compliant rental vehicle therefore lands between £20 and £55 in most cases. The rental company has up to several weeks after rental return to process the charge against the customer card.
What the rental contract says about emissions charges
All major UK rental contracts contain a clause covering moving traffic offences, congestion charges and similar local authority charges. The clause typically authorises the rental company to charge the hirer's card for any such fee plus an admin charge, without further notice. The hirer is deemed to have accepted these terms by signing the rental agreement at pickup. Renters should read this clause before signing, since the admin fee is set unilaterally by the rental company and not subject to negotiation.
A separate clause typically addresses the renter's responsibility to drive a compliant vehicle if the rental company has provided one, and to pay the daily charge if the rental car is non-compliant. Some agreements include a "no charge" guarantee where the rental company commits to providing only Euro 6 diesel or compliant alternatives at airports near major CAZ zones, but this is not universal and renters should ask explicitly at pickup.
Pickup checks: confirm CAZ compliance before driving
At pickup, renters should ask the rental desk to confirm that the assigned vehicle meets ULEZ and CAZ compliance standards, namely Euro 6 for diesel and Euro 4 for petrol. The rental agent can verify this from the V5C registration record or fleet system. For belt-and-braces certainty, the renter can run the registration plate through the TfL vehicle checker at tfl.gov.uk/modes/driving/check-your-vehicle, which gives an instant compliant or non-compliant result for London ULEZ, and the gov.uk CAZ vehicle checker for English zones.
If the assigned vehicle is non-compliant and the renter intends to enter a charging zone, the renter has two practical options: request a different vehicle from the rental fleet (which may incur an upgrade fee), or accept that the daily charge plus admin fee will be billed for each zone entry. At airports near London, Birmingham and Bristol, most major rental companies now stock predominantly compliant fleets, but exceptions occur on smaller branches.
Disputing a charge raised on a compliant vehicle
If a rental company bills a CAZ daily charge for a vehicle that was in fact compliant (a Euro 6 diesel wrongly flagged), the renter can dispute the charge directly with the rental company. The dispute process typically requires evidence of compliance, usually a screenshot of the TfL or gov.uk vehicle checker result for the registration plate showing compliant status. The rental company should refund the original charge and the admin fee if the dispute succeeds.
Where the rental company refuses, the renter can escalate to TfL directly for the original ULEZ daily charge, or to the issuing council for English CAZ charges, on the basis that the underlying fee was applied to a compliant vehicle. Successful TfL or council refunds may not cover the rental company's admin fee, but they remove the underlying daily charge that triggered it.
Long rentals and corporate rate hires in 2026
For multi-week rentals or business corporate rate hires, the rental company may aggregate multiple daily charges into a single end-of-rental invoice rather than billing each one individually. Corporate clients often have negotiated terms that cap or remove the admin fee on traffic-related pass-throughs. Renters on a corporate rate should check with their booking agent whether the fee schedule applies in full or has been waived.
Frequent business renters should keep a record of every rental's registration plate, pickup date and return date, in case a charge appears weeks later for a vehicle the renter no longer recognises. Some rental companies issue an end-of-rental statement summarising all daily charges, others bill silently and only notify by card transaction notification. Reviewing card statements for the 30 days following any rental in a CAZ city is a sensible discipline.
Peer-to-peer car hire and CAZ exposure
Peer-to-peer car hire platforms such as Turo and Hiyacar in the UK operate differently from major rental brands. The owner of the vehicle is the registered keeper, not a corporate fleet, so any CAZ daily charge or PCN goes to the owner first, who then bills the borrower under the platform's terms. Admin fees vary by owner and platform, and dispute resolution can be slower than with major rental brands. Borrowers should verify the listed vehicle's CAZ compliance before booking and confirm the platform's traffic charge clause.
| Rental company | Admin fee | Pass-through method | UK contract clause name |
|---|---|---|---|
| Hertz | £25 per incident | Card on file | Traffic Violation Processing Fee |
| Avis | £15-25 per incident | Card on file | Traffic Charge Service Fee |
| Enterprise | £10-25 per incident | Card on file | Toll and Charge Service Fee |
| Sixt | £25 per incident | Card on file | Processing Fee |
| Europcar | £42 per incident | Card on file | Traffic Offence Fee |
| ★ EDITOR'S VERDICT For UK renters entering Clean Air Zones in 2026, the cleanest path is to request a CAZ-compliant vehicle at pickup and verify the registration plate on the TfL or gov.uk checker before driving. If the only available vehicle is non-compliant and the trip needs to enter the zone, factor a £20 to £55 cost per day into the trip budget for charge plus admin fee, and keep the rental contract clause to hand. For frequent business rentals into London or Birmingham, ask the booking agent or corporate account manager to confirm whether the admin fee is waived under the corporate agreement. Always dispute charges raised in error on a compliant vehicle with evidence from the official vehicle checker. |
| This article is for informational purposes only and does not constitute financial, legal, or motoring advice. Always verify with the relevant local authority before making decisions. |
Frequently asked questions
Who pays the ULEZ charge on a hire car?
The rental company pays TfL initially as registered keeper, then bills the renter for the £12.50 daily charge plus an admin fee using the card on file. The contractual responsibility sits with the renter under the rental agreement signed at pickup.
Can I pay the ULEZ directly to TfL on a hire car?
Yes, technically. Anyone can pay £12.50 on any registration plate via the TfL website or app. However, the rental company often pays first as part of its automated back-office process, so a renter pre-paying may end up double-charged unless they coordinate with the rental desk in advance.
How long after rental can a charge appear?
Up to several weeks. The rental company waits for the original charge or PCN to land from TfL or the issuing council before processing the pass-through to the renter's card. A 14 to 30 day window after rental return is normal industry practice.
Are airport rentals always CAZ-compliant?
Mostly, but not always. London Heathrow, London Gatwick, Birmingham and Bristol airport branches typically prioritise compliant vehicles, but renters should still verify the assigned plate at pickup using the official vehicle checker.
What if I receive a PCN by post for a hire car?
Forward the PCN to the rental company immediately, since the registered keeper is the rental company and the PCN should not be in the renter's name in the first place. The rental company will handle the PCN response with TfL or the council and bill the renter under the contract.
Can I refuse to pay the rental admin fee?
Refusing typically triggers a card chargeback dispute. The rental company contract clause authorises the fee, and the rental company will defend the charge with the card issuer. Disputing the underlying charge for a wrongly flagged compliant vehicle is more likely to succeed than refusing the admin fee on principle.
Are EV rentals exempt from CAZ charges?
Yes. Battery electric vehicles and hydrogen fuel cell vehicles are exempt from all UK CAZ daily charges, so renting an EV avoids both the daily charge and the rental company admin fee for zone entry.
Sources
- Hertz UK rental terms and traffic violation policy, hertz.co.uk (accessed 2026)
- Avis UK rental terms and conditions, avis.co.uk (2026)
- Enterprise UK rental terms, enterprise.co.uk (2026)
- Sixt UK terms and conditions, sixt.co.uk (2026)
- Europcar UK rental terms, europcar.co.uk (2026)
- UK Government, Clean Air Zones, gov.uk/clean-air-zones (2026)
- Transport for London, ULEZ vehicle checker, tfl.gov.uk/modes/driving/check-your-vehicle (2026)
Internal links: CAZ refund process 2026 · Clean Air Zones UK overview · CAZ business vehicle charges 2026