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Last updated: 25 March 2026

This article was originally triggered by confusion in winter 2010 about whether fitting winter tyres could “invalidate” cover. At the time, trade reporting said the Association of British Insurers (ABI) confirmed that fitting winter tyres to commercial vehicles does not invalidate insurance, after concerns were raised about tyre speed ratings. 

The practical position today is similar, but with an important caveat: insurer rules can vary, especially on commercial policies.

What the ABI says now

ABI guidance states that most motor insurers do not charge additional premiums for vehicles fitted with winter tyres, as long as the tyres are roadworthy and fitted in accordance with the manufacturer’s instructions. 

That doesn’t mean “no questions asked” in every case — some insurers may still want to be told, particularly if:

• The tyre size/spec differs from manufacturer-approved fitments
• Wheels/tyres change the vehicle’s standard specification materially
• Your policy has specific modification notification terms (more common on commercial cover)

A sensible rule is: if you’re unsure, ask and keep a record.

Do winter tyres count as a “modification”?

Don’t assume either way. Many insurers treat winter tyres as a safety-oriented seasonal change when they’re the correct specification and fitted properly, but practices vary across the market. 

What matters most (for safety and for claims) is that tyres remain legal, roadworthy, and appropriate for the vehicle.

Why winter tyres can help (especially for vans)

TyreSafe notes that when temperatures drop below 7°C, standard tyre compounds begin to harden and lose grip, while winter tyres use compounds designed to stay more flexible in cold, damp conditions. 

In real-world terms, winter tyres can:

• Improve grip on cold wet roads, slush and light snow
• Reduce wheelspin and help braking/steering feel more predictable
• Support safer driving in winter conditions (still requiring slower speeds and larger following distances)

The Highway Code is still the foundation: adjust speed, increase gaps and drive smoothly in adverse weather. 

A quick “fit winter tyres without headaches” checklist

• Use manufacturer-approved sizes/specs (check handbook/door sticker where applicable). 
• Fit winter tyres as a full set (don’t mix types across an axle).
• Ensure tyres are roadworthy (tread, pressures, condition) and fitted by a reputable fitter. 
• If your winter tyres have a different speed rating to your usual tyres, follow the tyre manufacturer/fitter guidance and check what your insurer expects (especially on commercial policies).
• Tell your insurer if your policy wording treats any change from standard spec as notifiable — don’t guess.

The insurance takeaway (kept realistic)

Winter tyres are generally viewed as a safety measure, and ABI guidance indicates most insurers don’t charge extra when tyres are correctly fitted and roadworthy. 

But “most” is not “all”, and commercial policies can be stricter — so it’s worth checking the policy wording or confirming with your insurer if you’re uncertain.

Sources

1. Commercial Motor (archived) — ABI confirmation that fitting winter tyres to CVs does not invalidate insurance (9 Dec 2010). 
2. ABI — Winter tyres (current ABI consumer guidance: most insurers don’t charge extra if tyres roadworthy and fitted to manufacturer instructions). 
3. Aviva — Winter tyres and whether they invalidate insurance (insurer perspective: most don’t require contact; some do; commitment reference). 
4. TyreSafe — Winter tyre safety guidance (below 7°C compound/grip explanation). 
5. GOV.UK — Highway Code: Driving in adverse weather conditions (winter driving behaviour).