Are Lowering Springs Legal in the UK?
Lowering Springs are legal in the UK as long as the car stays safe and roadworthy. There is no minimum ride-height law, but lower it too far and it fails the MOT.
Why?
Lowering springs swap your standard springs for shorter, usually stiffer ones to drop the car a fixed amount. Fitting them is legal: the UK sets no minimum ride height in millimetres, only that the car stays safe and roadworthy.
That means the tyres must stay covered by the arches, the suspension geometry must stay within safe limits, and the car must not be so low it bottoms out or grounds its underside on normal roads. Go too far and you risk an MOT failure or a "dangerous condition" offence.
Lowering also throws out your headlamp aim, which is an MOT check, so the lights should be re-aimed after fitting. And, as with any modification, you must declare it to your insurer.
What decides if it's legal
- Tyres must stay covered by the wheel arches.
- No bottoming-out or grounding on normal roads; geometry must stay safe.
- Headlamp aim re-checked after lowering (an MOT item).
- Declare the modification to your insurer.
Does it depend on your car?
A typical lowering-spring drop (around 25-40mm) is usually trouble-free, but the safe amount depends on the car's arch clearance and standard geometry. Your specific car's page covers the springs that fit and how far they drop.
Common questions
Will lowering springs fail an MOT?
Not by being fitted. There is no ride-height rule in the MOT, so a sensibly lowered car passes. It fails only if the lowering causes a defect the test does catch: tyres fouling the arches, headlamp aim now out, a "dangerous" ground clearance, or damaged/insecure suspension components. Get the headlamps re-aimed after fitting and keep the tyres covered and it is a non-issue.
How low can I legally go?
There is no legal millimetre limit in the UK. The line is roadworthiness: the tyres must stay within the arches, nothing may foul or rub, the underside must not ground on normal roads, and the car must not be in a "dangerous condition". Extreme drops that scrub tyres or bottom out cross into an offence, so most road cars stay in the moderate range rather than chasing the lowest possible.
Do I have to tell my insurer?
Yes. Lowering is a modification your insurer needs to know about, whether by springs or any other method. Not declaring it can void a claim. It may nudge the premium, but a declared, sensibly lowered car is normally straightforward to insure.
Related guides
Related legality guides
Sources
Sources last reviewed July 2026.
This page is general guidance, not legal advice, on the rules in the UK for lowering springs. The detail varies by exact vehicle and changes over time - confirm with your insurer and the latest DVSA and GOV.UK guidance before modifying.