What insurance group actually means for your first car
What UK insurance groups (1 to 50) mean for a first car, and the real derived pound gap between the lowest and highest group in our own dataset at 17 — priced, not just explained.
Every used-car buying guide mentions insurance group. Almost none of them tell you what it's actually worth in pounds. Group is a standard UK motor-insurance scale, 1 to 50, that ranks a car by how cheap or expensive it is to repair, replace parts for, and how much performance and value sits behind the badge — lower means cheaper to insure, all else equal. That's the theory. Here's what it does to our own first-car data.
We took every car in the Vouched dataset — the full set, curated and extended, not just the shortlist — and worked out our modelled premium for a 17-year-old driver in every insurance group that actually has a car sitting in it. Not every number from 1 to 50 is occupied; some groups in that range have no car in our data at all, so we only ever name a group we can actually price.
The real spread
Group 1 is the lowest group any car in our data sits in — 5 cars, median £2,250 a year at 17 (£2,133–£2,282 across those cars). Group 48 is the highest group present — 1 car, median £6,506 (£6,506–£6,506). The gap between the two medians is £4,256 a year, at the same age, before a single other input changes. That's the number a “group matters” page owes you and almost never gives you.
Worth flagging: group 48 currently holds just one car in our data, so that top row is one data point, not a robust median — the next car that lands in that group could move it either way. Group 1, at the other end, rests on 5 cars, which is why we lead with it rather than the single highest row alone.
How it climbs in between
Insurance group doesn't move in a straight line from cheap to expensive, and it doesn't move by the same amount every step either. Sampling evenly through the groups that actually have a car in them — not evenly through the numbers 1 to 50 — shows the real shape:
| Group | Cars we hold there | Median est. premium at 17 | Range |
|---|---|---|---|
| Group 1 | 5 | £2,250 | £2,133–£2,282 |
| Group 9 | 11 | £2,581 | £2,423–£2,692 |
| Group 17 | 6 | £2,934 | £2,312–£3,218 |
| Group 26 | 2 | £3,868 | £3,770–£3,966 |
| Group 48 | 1 | £6,506 | £6,506–£6,506 |
Figures checked July 2026
Heads-up: Market update (27 July 2026): two major insurer groups — including the cheapest black-box provider in most of our data — left the comparison panel we calibrate against, and cheapest quotes for young drivers rose roughly 50%. Our estimates now track this new, higher market. If those insurers return, real quotes could come in below the range shown — get a real quote before you budget.
The bottom two or three rows tend to sit close together — among the cheap, small, low-powered cars a first-time buyer actually cross-shops, group is doing comparatively little work, because those cars are already similar in value and performance. The gap between the top row and everything below it is where group starts to matter a lot: that's usually where value, power and repair cost genuinely diverge, not just the group label.
What this means for you
Group is a real, useful shortcut — it's printed on the listing before you've looked at anything else, and it correlates with what you'll actually pay. But it's one input among several our own model uses (age, postcode, the car's own value, and more), and the table above shows it isn't evenly spaced: the difference between two adjacent groups at the cheap end can be a lot smaller than the same one-group step nearer the top. Treat group as a first filter, not the whole answer — then check the modelled premium for the exact car and trim you're looking at in the First Car Finder, which also adjusts for your own age and postcode rather than the 17-year-old, no-postcode figures on this page.
These are modelled estimates from public data, not quotes. They're calibrated for a black-box (telematics) policy with no district applied — this page can't know your postcode, so every figure above is our London-anchor number, which is why the range on each row is wider than a version of this table built for one specific place would show. Group placement itself comes straight from the dataset's own insurance-group field, not something we assign. Vouched does not give insurance advice; when you're ready, we introduce you to authorised providers for a real quote.
Try it yourself
Want the same kind of number for your own age and postcode, on a specific car rather than a group median? The First Car Finder runs the identical model behind this page, live. Or see how the cheapest options in the lowest groups stack up against each other in our cheapest cars to insure at 18 ranking.
Sources
- Insurance groups and premium estimates:
data/first-cars.json(Vouched internal dataset), read at build time — this page holds no figures of its own.