The Legal Side of Vehicle Modifications: What You Need to Know

04 February 2025

Stay Compliant & Avoid MOT Failures with Legal Vehicle Modifications

Many vehicle owners in West Yorkshire love to modify their cars, whether it’s window tinting, upgraded lighting, or security enhancements. However, not all modifications are MOT-compliant or legal under UK road regulations.

At Automotive Solutions, we ensure that every upgrade, from LLumar window tinting to parking sensors and accident cameras, meets UK legal standards. Here’s what you need to know about modifying your vehicle without breaking the law.

UK Window Tinting Laws: What’s Legal?

Front Windows & Windscreens

The front windscreen must allow at least 75% of light through.
Front side windows must allow at least 70% of light through.
Rear windows & back windscreen – No legal restrictions.
Penalties: Non-compliant tints can lead to fines, penalty points, or MOT failure.

Fact: At Automotive Solutions, we only install LLumar films that comply with legal light transmission levels, ensuring your vehicle is road-legal.

Headlights & Lighting Regulations

Are Aftermarket LED & HID Headlights Legal?

HID/LED conversions are only legal if they meet E-mark approval and are correctly aligned.
Blue or excessively bright lights can result in a failed MOT or penalties for dazzling other drivers.
Under-car neon lighting is illegal while driving on public roads but allowed when stationary.

Tip: If upgrading headlights, make sure they are E-marked and fitted correctly to avoid MOT issues.

Exhaust Systems & Noise Restrictions

Exhausts must not exceed 74 decibels (dB) under UK law.
De-catting (removing the catalytic converter) is illegal for road use and leads to an MOT failure.
Performance exhausts must have a road-legal approval mark.

Did You Know? Police and MOT testers can use decibel meters to measure exhaust noise levels.

Number Plates: Legal Font & Spacing Rules

Plates must use BS AU 145e-compliant reflective material.
Custom fonts, tints, and spacing alterations can result in fines.
3D and gel plates are legal, but must not obscure readability.

Fact: ANPR cameras struggle to read heavily stylized or tinted plates, increasing the risk of fines.

Security & Tracking Devices: What’s Allowed?

Are Dash Cams & GPS Trackers Legal?

Dash cams are fully legal but must not obstruct the driver’s view.
Thatcham-approved trackers are recommended for insurance benefits.
Immobilisers and steering locks are legal and improve anti-theft protection.

Bonus: Many insurance providers offer discounts for vehicles fitted with security systems.

“

I had no idea what I needed, but Mark took the time to explain all my options. Fantastic customer service!

Kevin J. – Subaru 

Why Choose Automotive Solutions for Legal Vehicle Modifications?

✔ Fully Compliant Installations – We ensure all modifications meet UK laws & MOT requirements.
✔ High-Quality LLumar Window Films – Installed to meet light transmission regulations.
✔ Approved Security Devices – We fit dash cams, parking sensors, and immobilisers legally.
✔ Expert Advice – We help you modify your car without risking fines or MOT failures.

Upgrade Your Vehicle Legally with Automotive Solutions

🚗 Want to modify your car while staying road legal? Contact us today for expert legal modifications in West Yorkshire.

📞 Call: 07710 962101
📧 Email: mark@automotive-solutions.co.uk
📍 Visit Us: Wellholme Garage, Bradford Rd, Brighouse HD6 4AA