The short answer
Your renewal letter shows a bigger number, and you want to know why. There's no single cause. Most rises fit into four buckets.
The first bucket is the market itself and isn't about you at all. The second is your own record over the past year. The third is the car's own record, which can change without you doing anything. The fourth is the law: what the letter must show you, and the limit on how the renewal price is set.
Jump to the bucket that fits your case, or work through them in order. There's more in our insurance advice section.
Did the market move, or did you?
Start with the part that isn't personal. The Association of British Insurers (ABI) tracks what UK drivers actually paid each quarter. In the second quarter of 2026, the average motor premium paid was £566. That's £6 more than the quarter before, a rise of 1%.
Claims cost more too. The ABI says the average motor claim payout rose to £4,900 in the same quarter, up 4% on the previous quarter. The average windscreen repair rose 7% in the quarter, to £283.
Why are repairs dearer? The ABI points partly at advanced vehicle technology. Sensors, cameras and driver-assistance systems make repairs and replacements more expensive than they used to be.
Treat these figures as context rather than a verdict. They're market averages, not a prediction for any one policy. A rise bigger or smaller than the market's tells you the market moved, not whether your own number is fair.
What your renewal letter must legally show
Now pick the letter back up. FCA rules set a legal minimum for what a renewal notice must show you, under rule ICOBS 6.5.1R of the FCA Handbook. Check your own letter against it.
The notice must state the premium you'd pay on renewal. Next to it, it must state the premium set when your policy began, adjusted if you made mid-term changes. So the comparison with what you were paying should already be on the page.
It must also tell you to check that your level of cover is appropriate. It must say you can compare the prices and cover offered by other providers. And it must say whether the policy renews automatically or needs you to act.
Been with the same insurer a while? From your fourth renewal in a row, the notice must carry a prescribed sentence: "You have been with us a number of years. You may be able to get the insurance cover you want at a better price if you shop around."
All of this must be clear, accurate, and in writing or another durable medium. It must be presented in a way that draws your attention to it as key information. This rule is about disclosure, not price. It makes the insurer show you the comparison; a separate rule governs the renewal price itself.
Is the rise even legal? The pricing rule's exact scope
Here's the pricing rule itself. Since 1 January 2022, FCA rule ICOBS 6B.2.1R has said that a firm "must not set a renewal price that is higher than the equivalent new business price".
The comparison has a precise shape. It assumes you approached your insurer through the same channel you originally bought through. If you first bought online, the benchmark is that insurer's own online new-customer price for you today.
The scope is specific too. The rule covers home and motor insurance sold to consumers, including related add-ons and premium finance, with combined packages each priced separately. It doesn't cover every policy. A car insured for business use on a non-consumer contract sits outside this comparison.
Be equally clear about what the rule doesn't do. It doesn't stop a different insurer pricing the same risk lower than yours does. It doesn't cap or freeze the underlying risk-based price, so a renewal can still rise. It stops your insurer charging you more than its own equivalent new-customer price, and nothing wider.
Why does the rule exist? Before it came in, the FCA found that 6 million home and motor policyholders paid high prices in 2018. Had they paid the average for their risk, they'd have saved £1.2bn between them. That finding is history rather than a live figure; it describes the market the rule was built to fix.
Our guide to why postcode affects car insurance quotes the rule in full. It also walks through the complaints route, step by step, if you believe the rule has been broken.
What changed about you this year?
Now look at your own year. Insurers price the renewal on the details your policy now carries. If any of those details changed, the price can move with them.
Start with incidents, not just claims. The Motor Insurers' Bureau (MIB) runs the Claims and Underwriting Exchange, known as CUE. It records motor incidents "that may or may not have resulted in a claim". So a bump you reported but never claimed for can still sit on your own record.
How long does it stay? Six years from the date the claim or notification is closed. You can ask MIB for your own CUE record through a data subject access request, online, by email, by phone or by post. MIB says it responds within one month.
If you did claim, check the schedule for the knock-on effects. Look at what happened to your no-claims discount, and whether it was protected.
Then check the people and the numbers on the policy. Did your named drivers change during the year? Did you move house? Your postcode carries pricing weight of its own, which the postcode guide linked above covers in full.
Check your declared mileage against reality too. Your MOT history records the mileage at every test, and our free car check shows it. If you declared 6,000 miles a year and actually drive 12,000, that gap matters at renewal.
One duty sits underneath all of this. Leaving a change undeclared at renewal risks a misrepresentation under the Consumer Insurance (Disclosure and Representations) Act 2012. Take reasonable care to answer the renewal questions accurately.
What changed about the car?
The car has a record of its own. UK insurers log written-off and stolen vehicles on an industry-shared register, now held on MIB's Navigate platform. Our car accident history check guide explains that register in full.
A marker can land after your policy started. An accident or write-off recorded during the year is exactly the kind of vehicle-side change that can move a renewal price. Whether a write-off marker definitely costs you more is less settled than that sounds. Our guide to insuring a Cat S or Cat N car sets out the honest answer.
Modifications count too. Anything added during the year, or discovered during it, changes the car being priced. Our guide to undeclared modifications and your insurance covers what to declare and what happens if you don't. The car's own risk rating feeds the price as well, and the postcode guide explains how that grading works.
Some of what an insurer prices sits on industry registers you can't see directly. A write-off marker, an accident record or an odd mileage jump can even predate your ownership.
Our Comprehensive check reports write-off category, outstanding finance, stolen markers and mileage history from the registration. That's the same shape of information an insurer's systems hold, made visible to you. It won't tell you why your specific premium rose. It will show you the vehicle-side facts a pricing model can already see.
What you can actually do before the renewal date
Don't just accept the number. First, run the test the pricing rule actually uses. Get a genuine like-for-like new-customer quote from your own insurer, through the same channel you first bought through. That quote is the equivalent new business price your renewal is measured against.
If it were my renewal, I'd get that quote before I did anything else.
Now review what you control. Check the named drivers still reflect who really drives the car. Look at your voluntary excess, and make sure the declared mileage matches reality. Ask your insurer what protecting your no-claims discount would cost.
Want to switch instead? You have the right to cancel automatic renewal, at any time and free of charge. FCA rules say the firm must give you easy and accessible ways to do it. Those must include at least every method you could use to buy a new policy from that firm.
Cancelling auto-renewal isn't a price cap, though. It only stops the policy renewing by itself, so line up new cover before the old policy ends.
Make one last check before you pay. If your renewal is genuinely higher than that same-channel new-customer quote, complain. The route runs through your insurer first and then the Financial Ombudsman Service. The postcode guide sets it out in full.
Your questions answered
My renewal notice doesn't show last year's premium. Is that legal?
It should be there. FCA rule ICOBS 6.5.1R covers this. A renewal notice must state the new premium alongside the premium set when the policy began. That earlier figure is adjusted for any mid-term changes you made. The notice must also be presented so your attention is drawn to it as key information. So if yours doesn't show the comparison, raise it with your insurer first. If you're unhappy with the final response, the complaints route in our postcode guide applies here too.
Why did my insurance go up even though I didn't make a claim?
Two things can move your price without a claim. First, the market itself. The ABI's figures show the average premium paid reached £566 in Q2 2026. The average motor claim payout rose to £4,900 in the same quarter. Second, your own record can change without a payout. CUE is the industry's Claims and Underwriting Exchange. It records incidents that may or may not have resulted in a claim, and holds them for six years from closure. An incident you reported but never claimed for is still part of the picture your insurer prices.
Does changing my named driver affect my renewal price?
It can. Your renewal is priced on the details the policy carries. Named drivers are part of those details. Change who is named and you've changed what's being priced. So the quote can move either way. Whatever you do, declare the change accurately. Leaving it out risks a misrepresentation under the Consumer Insurance (Disclosure and Representations) Act 2012.
Will cancelling auto-renewal stop my price going up?
No. It's a right to stop the policy renewing by itself. You can use that right at any time during the policy, and free of charge. But it isn't a price control. You can cancel auto-renewal and still be quoted a price you don't like. That goes for your own insurer and for anyone else. The only pricing limit is the separate rule. Your renewal can't be set higher than your insurer's equivalent new-business price through your original channel.
Can I get a lower renewal price just by phoning and asking?
No rule forces an insurer to give a discount for asking. The enforceable benchmark is different: your insurer's own new-customer price for the same cover, through the channel you first bought through. Get that quote before you phone. If it's lower than your renewal, you're not asking for a favour. You're pointing at the price the rules say your renewal shouldn't exceed.
Does my insurer have to tell me why my premium went up?
The disclosure rules require a comparison, not an explanation. Your notice must show this year's premium next to last year's and tell you that you can shop around. Nothing in those rules makes the insurer itemise the causes of a rise. So the practical substitute is to work through it yourself. Take the market first, then your own record, then the car's.