Are 4D Plates Legal? DVLA Rules and Regulations on 3D & 4D Number Plates in the UK

Thinking of upgrading to a 3D or 4D number plate? Before you make the switch, here is everything you need to know about DVLA rules and regulations so you do not risk fines or MOT failures. At PlateZone, we help drivers stay stylish while staying fully compliant with UK laws.

What Are 3D & 4D Number Plates?

3D gel number plates use domed letters with a glossy finish. They offer a stylish look while remaining legal.
4D gel number plates use layered gel acrylic for depth.
4D laser plates are crisp and precise.
4D gel 7 mm number plates give extra thickness for a more pronounced 3D effect.
4D halo plates add a subtle glow accent.

The main difference is: 3D plates have smooth curves, 4D plates are bold and layered. Drivers choose them for personalization, aesthetics, and a more modern feel, without breaking DVLA rules.

Are 3D & 4D Number Plates Legal in the UK?

Yes. Both types are legal if they meet DVLA standards. The DVLA sets rules for design, clarity, and safety. Plates following correct font, spacing, reflectivity, and standards are road-legal.
Since September 2021, new regulations require all plates to comply with BS AU 145e, ensuring they are durable and readable by cameras and enforcement staff. Some sellers market tinted, neon, or carbon-effect plates as legal—but they are not.

What Are the DVLA Rules for Number Plates?

According to DVLA guidance (INF104):

• Reflective background: white (front), yellow (rear)

• Must meet BS AU 145e standard

• Use the Charles Wright font in correct size

• No patterns, tinted covers, or colour overlays

• Correct character spacing is mandatory

• Reflective surface must stay clean and undamaged

• Must display supplier details and BS code

Failing any of these makes the plate illegal.

DVLA’s New Standard – What Is BS AU 145e?

BS AU 145e replaced BS AU 145d in September 2021. It requires better durability and clarity to make plates more robust and camera-friendly. All new plates must carry the standard and supplier information.

Common Mistakes That Make Plates Illegal

• Altered spacing to form words

• Smoked or tinted cover overlays

• Carbon fibre look or shadow fonts

• Glitter or background patterns

• Missing BS AU 145e code

• Films that reduce reflectivity

What Are the Penalties for Non-Compliance?

• £100 fixed penalty fine

• Plates can be confiscated

• MOT failure if unreadable

• Repeat offences can lead to vehicle deregistration

Are 3D & 4D Plates MOT Friendly?

Yes—but only if they follow DVLA rules. Plates with spacing issues, tinted features, or odd fonts will fail MOT. Laser-cut 4D plates pass when they are clear and compliant.

Do You Need to Inform DVLA When You Change to 3D/4D Plates?

No. You do not need to notify the DVLA as long as the registration number stays the same and the plates are legal.

How to Check If a Number Plate Supplier Is DVLA Registered

Look for:

• DVLA RNPS (Registered Number Plate Supplier) number

• BS AU 145e marking on the plate

• Supplier details clearly printed

At PlateZone, we are DVLA-registered and deliver plates with full compliance.

What Should Legal 3D/4D Number Plates Look Like?

Benefits of 3D & 4D Plates – Beyond Aesthetics

• Better visibility in all conditions

• More durable materials

• Clean, modern look

• Longer lifespan than standard printed plates

Can You Have Personalised Registrations on 3D & 4D Plates?

Yes. You can use personalised plates if characters meet DVLA spacing and font rules. At PlateZone, we help you choose styles that meet all rules and look great.

Where Can You Get Legal 3D/4D Number Plates in the UK?

You should buy from DVLA-approved suppliers to ensure compliance. PlateZone offers a full range of legal, BS AU 145e-certified plates, including 3D gel, 4D gel, 4D laser, 4D gel 7 mm, and 4D halo designs. We also verify every order for compliance before delivery so you can drive with confidence.

Maintenance Tips for 3D & 4D Plates

• Clean with gentle soapy water

• Avoid high-pressure washing directly on raised letters

• Check for peeling or fading regularly

Frequently Asked Questions

What is the difference between 3D and 4D plates?
3D plates use domed gel; 4D plates use raised acrylic or laser cutting.

Are 3D and 4D plates legal for MOT?
Yes, if they follow DVLA rules. Tinted or non-standard fonts will cause failure.

Can I get fined for tinted plates?
Yes. Tinted or smoked plates are illegal and carry a £100 fine.

How do I know if my plate is DVLA-approved?
Check for the BS AU 145e mark and clear supplier info.

Is it illegal to change the font of my number plate?
Yes. Only the Charles Wright font is legal in the UK.

Do I need to update my V5C when changing plate style?
No. The registration number remains unchanged.