The UK locations with the most modified cars

From installing a subwoofer to switching out the engine, there are lots of ways drivers can alter their cars to improve either the performance or the look of their vehicle.

Although many people modify their cars across the UK, it seems that some cities are making changes to their cars more than others. To discover where the most modified cars are located in the UK, we've looked at our internal data on enquiries mentioning ownership of modified cars.

While some modifications are legal, other alterations could be breaking the law. So, to help drivers avoid hefty fines and penalties, we’ve also taken a look at some of the different regulations regarding common car modifications.

Common car modification fines

Any car that has been changed in some way since it was manufactured is considered to be a modified vehicle and while not all changes are illegal, there are certain rules that need to be followed to ensure the alterations aren’t breaking the law.

To help drivers avoid hefty fines and penalties, we’ve taken a look at some of the different regulations regarding common car modifications.

1. Lowering suspension

Fine: £2,500
Penalty Points: 3

Lowered cars aren’t necessarily breaking the law, but the alteration must not interfere with the steering or affect the height of the headlights on the car. Suspension changes should always be carried out by a competent mechanic and components should never be cut and welded together as this can make the car dangerous to drive. Altering the height of the car could also lead to issues getting over speed bumps, which can result in serious damage to the vehicle.

If drivers are deemed to be using their car in a dangerous condition because of changes to their suspension, they could be hit with a fine of £2,500, plus three penalty points on their licence.

2. Adding large spoilers

Fine: £2,500
Penalty Points: 3

Adding a spoiler to a vehicle isn’t illegal, but the spoiler must be securely fitted to the bodywork and shouldn’t have any dangerously sharp edges. Under regulation 30 of the Highway Code, the spoiler also shouldn’t obstruct the driver’s view of the road or traffic.

As with lowering the suspension, if a spoiler is affecting a motorist’s control of a vehicle to such an extent that they are deemed to be using it in a dangerous condition, then they could face a fine of £2,500, and three penalty points.

3. Tinted headlights

Fine: £2,500
Penalty Points: 3

Headlights can be tinted, but by no more than 50%. The tint should also not alter the colour of the light, meaning they should remain white or yellow at the front, and red at the rear.

The Highway Code states that car lights must be working at all times, and they should also be kept clean and clear. If this isn’t the case, then drivers could be seen to be using their vehicle in a dangerous condition, and would face the consequence of a £2,500 fine, and three penalty points.

4. Installing a subwoofer

Penalty: Vehicle could be seized by the police

Installing a subwoofer isn’t against the law, but if you’re deemed to be playing it loud enough to cause alarm, distress, or annoyance, then the police have grounds to stop the vehicle.

Under the Police Reform Act 2002, they also have the power to seize and remove the car if a driver fails to adhere to a warning about noise levels.

5. Tinting windows

Fine: £60 and car taken off road until window tint is removed 
Penalty Points: 3

The law states that the front windscreen of a car must let at least 75% of light through, while the front side windows must let at least 70% in.

It is illegal to fit or sell glass that breaks these regulations. If your windows are tinted too heavily, you could be given a ‘prohibition notice’ which will stop you from using your vehicle until the extra tint is removed. Alternatively, you might receive a penalty charge notice, which would result in a fine of £60 and three penalty points.

6. Altering number plates

Fine: £1,000

There are several things to consider when altering your number plates. To be legal, a plate must have the correct font, colour, and character spacing, and also be made of certain materials.

The number plate of your vehicle must be made from a reflective material, display black characters on a white background for the front plate, and black characters on a yellow background for the rear plate.

The law also states that number plates must not have any background patterns, and must show the supplier of the plate. It must also be marked with a British Standard number, which is ‘BS AU 145e’ for plates fitted after 1st September 2021.

Those who want to modify their plates can legally have raised characters, display flags and identifiers, and even display a green flash if you have a zero-emission vehicle.

Failure to comply with these regulations could result in a fine of £1,000 and your vehicle will fail its MOT test if your number plate is incorrectly displayed.

7. Changing the colour of a car or swapping the engine

Fine: up to £1,000

Altering the colour of your car, either by wrapping or respraying, is perfectly legal, but you must update your V5C registration certificate if you do so. You must also update your VC5 if you switch your engine for a different one.

Failure to notify the DVLA of these changes to your vehicle will result in a fine of up to £1,000.