What ULEZ and Clean Air Zone Expansion Mean for UK Car Insurance

The Ultra Low Emission Zone (ULEZ) expansion in London and the rollout of Clean Air Zones (CAZs) in Birmingham, Bath, Bradford, Bristol, Portsmouth and other UK cities affect motor insurance through a mechanism that is often misunderstood. The zones do not directly change insurance premiums - the daily charge for driving a non-compliant vehicle in a zone is not a motor insurance product feature, and no mainstream insurer covers ULEZ or CAZ daily charges as part of a motor policy. The insurance impact is indirect but commercially real: the vehicle replacement behaviour that zones incentivise changes the composition of the urban vehicle fleet, and that compositional change affects local average claims costs, vehicle values and premium pricing. This analysis covers what TfL and DfT data shows about zone impact, how insurers price the affected postcodes, and what drivers with older vehicles in or near zones should know. See Kaeltripton UK Car Insurance hub for the broader context and average UK car insurance cost 2026 for postcode premium variation data.

What's happening: ULEZ and CAZ expansion

TfL's expanded ULEZ, which extended to cover all London boroughs from August 2023, applies a daily charge of £12.50 to non-compliant vehicles (broadly, petrol vehicles not meeting Euro 4 emissions standards and diesel vehicles not meeting Euro 6). TfL published compliance data showing the proportion of vehicles entering the zone that are non-compliant has declined significantly since the zone's original 2019 introduction and subsequent expansions - the zone has driven both fleet renewal and reduced entry by non-compliant vehicles. The scrappage scheme run alongside the ULEZ expansion provided grants of up to £2,000 for scrapping non-compliant vehicles, directly accelerating the removal of older vehicles from London's active fleet. For insurers, the accelerated removal of older, typically higher-theft-risk vehicles from the active fleet in London postcodes is a marginal positive factor in claims cost modelling for those areas.

ADVERTISEMENT

The data behind it: fleet composition and insurance pricing

Vehicle replacement dynamics. When a ULEZ or CAZ scheme incentivises the replacement of a 2003 diesel hatchback with a 2022 petrol or hybrid model, the insurance implications are multidimensional. The 2022 replacement vehicle: has a higher market value (higher total loss replacement cost for insurers); may carry ADAS systems that add repair complexity and cost for even minor collisions; carries manufacturer warranty that interacts with insurance claims settlement; and has a different theft risk profile from the older vehicle. The older vehicle being replaced: was typically in an insurance group reflecting its age and lower value; had lower total loss costs; and may have been insured at a lower premium. Fleet renewal in CAZ-affected areas therefore creates a mixed insurance effect: the removal of old high-theft-risk vehicles is positive, while the introduction of newer higher-value vehicles introduces higher per-incident claims costs.

Postcode premium variation. Motor insurance premiums vary significantly by postcode, reflecting local claims frequency, vehicle theft rates, traffic density, and the age and value profile of the local fleet. ABI and insurer data shows that inner London postcodes consistently produce some of the highest average premiums in the UK. The ULEZ expansion has not materially reduced inner London postcode premiums in aggregate because the fleet and traffic density factors that drive high urban premiums are largely unchanged - zone charges affect which vehicles enter, not the fundamental density and collision exposure of the urban environment. The most expensive postcodes for car insurance UK 2026 analysis covers the postcode premium distribution in detail.

Older vehicle insurance dynamics. Drivers who retain older, non-ULEZ-compliant vehicles face a specific insurance consideration: the daily ULEZ or CAZ charge is not an insurable cost under any mainstream motor policy. The £12.50 daily TfL charge for a non-compliant vehicle is a regulatory charge, not an accidental damage or third-party liability, and falls entirely outside motor insurance scope. Drivers who incur charges through genuine error (misunderstanding zone boundaries, Automatic Number Plate Recognition error) or vehicle misidentification can appeal to the relevant authority (TfL for ULEZ; Birmingham City Council for the Birmingham CAZ; JAQU - the Joint Air Quality Unit - provides general guidance). Motor insurance is not the remedy for CAZ charges in any scenario.

ADVERTISEMENT

What this means for UK drivers

For drivers in or near ULEZ and CAZ zones, the insurance considerations are: (1) the zone charge itself is not insured - budget for it separately if driving a non-compliant vehicle; (2) replacing a non-compliant vehicle with a newer model changes the insurance group and premium - compare insurance costs for the replacement vehicle before purchasing; (3) retaining an older vehicle outside the zone may be economically rational if the daily charge cost exceeds the depreciation-adjusted savings of replacement, but insurance costs for the older vehicle should be factored into the comparison; (4) the insurance market continues to price London and other high-traffic urban postcodes based on claims experience rather than zone status - ULEZ compliance does not attract an insurer discount as a product feature. For drivers considering whether to keep an older vehicle, see cheapest cars to insure UK 2026 for insurance group guidance.

Context: national CAZ rollout

Beyond London's ULEZ, the UK government's Clean Air Zone framework, administered through the Department for Environment Food and Rural Affairs (DEFRA) and the Joint Air Quality Unit (JAQU), has supported the implementation of CAZs in multiple English cities. Birmingham's CAZ, Bath's CAZ, and schemes in Bradford, Bristol, Portsmouth and others each carry different non-compliant vehicle categories, charge structures and geographic boundaries. Each scheme creates local vehicle replacement incentives. The cumulative effect of multiple urban CAZs accelerating fleet renewal in city centres is a national trend toward a newer, lower-emission urban vehicle fleet - which over time is expected to reduce some of the older-vehicle theft and claims cost factors that contribute to elevated urban premiums. The trajectory is directionally positive for urban insurance costs in the medium term, though the timing is incremental rather than step-change.

What's next

Further CAZ implementations are in the pipeline for UK cities with air quality compliance obligations. The Department for Transport's Road Investment Strategy and the government's Road to Zero strategy both point toward continued fleet electrification and emission reduction policy that will further accelerate the removal of older ICE vehicles from the active fleet over the 2026-2030 period. The insurance market impact of this transition - newer fleets, higher average vehicle values, more EV-specific claims complexity - will continue to be a pricing factor that intersects with zone policy in urban areas. Drivers planning vehicle purchases in CAZ-affected areas should factor both zone compliance costs and insurance cost changes into their total cost of ownership modelling.

Frequently Asked Questions

Does my car insurance cover ULEZ charges?

No. The TfL ULEZ daily charge of £12.50 for non-compliant vehicles is a regulatory charge, not an insurable loss. No mainstream motor insurance policy covers zone entry charges, penalty charge notices for non-compliance, or any cost arising from emission zone regulations. These are entirely outside the scope of motor insurance products.

Will buying a ULEZ-compliant vehicle reduce my car insurance?

ULEZ compliance itself is not an insurance pricing factor - no insurer applies a discount for zone compliance. However, a newer, ULEZ-compliant replacement vehicle will typically have a different insurance group from the older non-compliant vehicle it replaces. If the replacement vehicle has a lower insurance group, the premium will be lower; if it has a higher group (more likely for a newer, higher-specification vehicle), the premium may be higher. Comparing insurance costs for specific replacement vehicle options before purchasing is advisable. Use Thatcham's insurance group lookup at thatcham.org.

Which UK cities have Clean Air Zones?

As of May 2026, operational CAZs in England include London (ULEZ), Birmingham, Bath, Bradford, Bristol and Portsmouth, with additional schemes in development in other cities with air quality compliance obligations. Scotland and Wales have separate frameworks. The gov.uk/clean-air-zones page provides the authoritative current list of operational and planned zones, eligible vehicle categories, and charge structures. Each zone has different non-compliant vehicle definitions and charge amounts.

ADVERTISEMENT

Related: Most expensive postcodes car insurance UK 2026 | UK uninsured driver penalties 2026

Sources

• TfL ULEZ compliance and vehicle data - tfl.gov.uk - zone coverage, charge structure, compliance rates
• TfL ULEZ scrappage scheme data - tfl.gov.uk - grants issued and vehicle removal statistics
• DEFRA Clean Air Zone framework - gov.uk/clean-air-zones - national CAZ programme
• Joint Air Quality Unit (JAQU) - gov.uk - operational CAZ guidance and city scheme approvals
• DfT Road to Zero strategy - gov.uk - fleet electrification policy context
• ABI Motor Insurance Premium Tracker - abi.org.uk - postcode premium variation context
• Thatcham Research - thatcham.org - insurance group ratings for vehicle replacement assessment
• Clean Air Zones (Framework for England) - gov.uk - statutory framework
• DfT Licensed Vehicles Statistics - gov.uk - fleet composition and vehicle age data