NUMBERPLATERNumber plate spacing rules (and why they matter)
Spacing is where most illegal plates go wrong — not exotic fonts, just gaps moved a few millimetres to make a registration “read” as a word. The rule is simple: your registration has one legal grouping, and the plate must show it, with 11mm between characters and 33mm between the groups on a standard car plate. Here's what that looks like for each registration format.
The three modern formats
Current format (2001 on): two letters, two numbers, three letters. Displayed as “AB12 CDE” — the age identifier stays with the first two letters:
Prefix format (1983–2001): letter, up to three numbers, three letters. Displayed as “A123 BCD”:
Suffix format (1963–1983): three letters, up to three numbers, letter. Displayed as “ABC 123D”:
Dateless and Northern Ireland registrations
Older “dateless” registrations (no age identifier) and NI registrations come in several letter/number arrangements, and the correct display depends on the specific registration. That's why our configurator doesn't guess: for these formats a person confirms the legal spacing against your documents before the plate is pressed. It's the same principle as the rest of our process — nothing ships on a machine's guess.
Why “creative” spacing isn't worth it
Closing the gap so “AB12 CDE” reads as a name is the classic illegal plate. A mis-spaced plate is an incorrectly displayed plate — up to a £1,000 fine and an MOT failure — and because plates are checked at every MOT, it's a problem with an annual appointment. If you want a registration that reads a certain way, the legal route is buying a registration that actually spells it, then displaying it with its real grouping — see our retention & transfer guide.
The exact measurements (standard car plate)
- Character height: 79mm · width: 50mm (except 1 and I)
- Stroke thickness: 14mm
- Between characters: 11mm
- Between the two groups: 33mm
Motorcycle and two-line plates use their own smaller, fixed layout (64mm characters) — the full tables are in DVLA leaflet INF104. You never need to measure any of this with us: the builder applies the legal font, sizes and grouping automatically.
Quick answers
Is custom number plate spacing legal?
No. A registration must be displayed in its legal grouping with the prescribed gaps — 11mm between characters and 33mm between the two groups on a standard car plate. Changing the spacing to make a plate read differently makes it incorrectly displayed: up to a £1,000 fine and an MOT failure.
How should a current-style registration be spaced?
As two letters and two numbers, a gap, then three letters — 'AB12 CDE'. The age identifier (the two numbers) always stays attached to the first two letters; splitting it any other way is illegal.
What about dateless or Northern Ireland registrations?
Dateless and NI registrations come in several arrangements, so the correct display depends on the specific registration. We confirm the legal spacing for these by hand before pressing, as part of the document check.
Does the builder space my registration for me?
Yes. Type your registration and the configurator applies the legal grouping automatically — you can't buy a mis-spaced plate from us.
Need a plate that's actually legal?
Build yours in our configurator — legal font, sizes and spacing are applied automatically, and every order is entitlement-verified before you're charged. If a combination isn't road-legal, it won't let you build it.
Build your plate →Related guides
Reviewed 2026-07-02 · Written by Numberplater Ltd, a DVLA-registered number plate supplier (RNPS No. 75456). This guide is general information, not legal advice — the rules summarised here are set out in full in DVLA guidance (leaflet INF104 and GOV.UK).