Number plates are a legal requirement for any vehicle in the UK, and there are strict regulations surrounding their design and display. Legal 4D number plates must adhere to these rules as well.
In recent years, 4D number plates have become increasingly popular among car owners who want to give their vehicles a different look. In this blog post, we explore the laws surrounding 4D number plates and delve into how to make them legal, perfect for those curious about purchasing one and for those looking to print their own.
What Are 4D Number Plates?
The number plate is made in the traditional way by printing the registration on the reflective material, laminating the plate with its usual clear acrylic and then sticking the black acrylic characters over the top.’
4D number plates use black PMMA acrylic characters, which are hand placed over the top of the completed plate and stand slightly proud, making them more visually striking than traditional number plates. The number plate is made in the traditional way by printing the registration on the reflective material, laminating the plate with its usual clear acrylic and then sticking the black acrylic characters over the top.
There is a subset of 4D plates known as 4D gel plates. The main difference is that 4D gel number plates use gel resin for the raised characters, and appear more rounded compared to the thicker, square appearance of acrylic 4D plates. But are 4D gel plates legal too?
What Are The Laws Regarding Number Plates?
There are strict regulations in place to ensure that all types of number plates are easy to read, identify the vehicle they’re attached to and are road legal.
Some of the key regulations around number plates include:
- The size of the letters and numbers
- The type of font used
- The spacing of the letters and numbers
- The type of material the plate is made from
- Display black characters on a white background (front plate)
- Display black characters on a yellow background (rear plate)
Additionally, each plate fitted after September 2021 must be marked with the new British Standard number: BSAU 145e.

Are 4D Number Plates legal?
4D number plates are legal in the UK, and the laws are governed by the Driver and Vehicle Licensing Agency (DVLA). As long as the acrylic 4D plates and 4D gel plates are manufactured from tested and approved acrylic or gel resin, use reflective material with solid-black, non-reflective characters and meet the other BSAU 145e standards, they will be road legal. Ultimately, legal 4D number plates must be readable both during the day and night, and the characters cannot be removable.
In the unlikely event that a raised letter or number were to fall off, we’ve manufactured all our 4D plates to have the registration underneath the raised characters, ensuring your plate will always remain road legal and save you from any potential fines.
How To Ensure Your Number Plate Is Legal
While 4D number plates are legal in the UK, you must ensure the correct measures are taken to ensure your plates meet these standards and are not illegal.
Here’s what you need to do to ensure legal 4D number plates:
- Purchase 4D plates through a reputable supplier, or if printing your own, purchase the approved materials and equipment
- Characters must use the standard Charles Wright font, with regulated size and spacing
- Plates must be made from reflective material and be durable, weatherproof and compliant with BSAU 145e standards
- 4D plates must have laser-cut acrylic characters that don’t impair legibility or protrude excessively
- The raised letters must be solid black – no carbon, iridescent or coloured finishes allowed
- The 4D plate must include the supplier’s name and postcode and the British Standard number BSAU 145e
- Reflective material should be yellow for the rear and white for the front
- Motorcycles must have double-line plates only
Here’s what you need to avoid:
- Don’t alter character spacing or alignment
- Don’t use decorative logos or symbols, unless approved with a legal identifier
- Don’t use background patterns or tints
- Don’t fit 4D number plates with reflective or mirrored characters
- Don’t install illegal fixing methods that distort or obscure letters
At Uniplate, we ensure that all our 4D plates are manufactured to British Standards and rigorously checked before being dispatched. All our components, which can be purchased separately to make your own plates, also conform to the legislation outlined.
Get Your 4D Number Plates Today
Are 4D number plates legal? Yes, they are! And you can purchase legal 4D number plates from us here at Uniplate. Our 4D number plates are manufactured using high-impact acrylic and Oralite reflective sheeting, followed by laser-cut 4D digits applied in high-gloss black.
We also supply the equipment needed to print your own 4D plates. As the UK’s premier number plate specialist, we stock everything necessary to create the perfect 4D number plate. Whether you’re looking for a single 4D number plate or want to implement printing the plates into your production process, Uniplate is the one-stop supplier for all your number plate needs.
CONTACT THE EXPERTS
For more information on our equipment or how we can help with legal 4D number plates, contact our sales team on 01827 310 000 or email us directly at enquiries@uniplate.co.uk. Our team would love to hear from you and are always happy to help.