Legal Here, Illegal There: 4WD Modification Laws by State
A 4WD that’s perfectly legal at home could be breaking the rules in another state, and most owners have no idea.
Every state and territory in Australia has its own rules on how high you can lift a 4WD, what makes a bull bar legal and when you need permission to modify. We fit out 4WDs for people heading interstate all the time, so we went through each state and territory’s published modification rules and penalty schedules to see how far apart they are.
We compared the lift limits allowed without engineering certification, along with the on-the-spot fines for light vehicles as at September 2026. No state or territory has a fine written specifically for lifts, bull bars or wheel spacers, so the fines below are the general vehicle standards offences police can issue.
It’s a live issue. Queensland police recently warned drivers that some popular add-ons, like reflective window covers, can land them a $402 fine.
How high can you lift a 4WD in each state?
How high you can legally lift a 4WD without an engineer’s sign-off depends entirely on where the vehicle is registered. The Northern Territory is the most relaxed at 100mm, while NSW, Victoria and Queensland allow 75mm. South Australia, Tasmania, the ACT and Western Australia all cap it at 50mm.
| State or territory | Legal lift (no engineer) | The catch |
|---|---|---|
| NT | 100mm | Measured from the roof, and a wheel alignment report is needed |
| NSW, VIC, QLD | 75mm | No more than 50mm can come from the suspension |
| SA, TAS, ACT | 50mm | Anything higher needs an engineer’s sign-off |
| WA | 50mm | Requires inspection |
How high you can lift a 4WD in each state and territory without an engineer’s sign-off. Source: State and territory transport authorities. Analysis by OCAM 4x4 Accessories.
Bigger tyres count towards the limit
Bigger tyres count towards the lift limit too, but only by half. A tyre that’s 50mm taller lifts the car by just 25mm, because the axle sits in the middle of the wheel.
“People see 75mm and think they can bolt on a 75mm lift kit,” says Peter Gorgievski, director of OCAM 4x4 Accessories. “But that 75mm is the suspension and the tyres together. If you put bigger tyres on top of a big kit, you’ll go over the limit without even realising it.”
Even how the lift is measured changes from place to place.
“In the Northern Territory, for example, it’s measured to the roof, so everything underneath counts: suspension, body lift, tyres, the lot,” Peter says. “Same car, same tape measure, and you can get a different answer depending on where you are in the country.”
Fines for an illegal lift
If your lift is over the limit, the fine depends on where you’re pulled over. Tasmania and Victoria carry the highest on-the-spot fines, at up to $852 and $836, while the Northern Territory’s is $60.
| State/territory | On-the-spot fine | Offence(s) police can issue |
|---|---|---|
| NSW | $144–$241 | Vehicle not complying with dimensions or tyre standards ($144); unsafe or unserviceable vehicle ($241) |
| VIC | $523–$836 | Vehicle exceeding permitted dimensions ($523); modified vehicle not complying with standards, or unsafe vehicle ($836) |
| QLD | $172–$518 | Defective light vehicle ($172, 1 pt); defective vehicle that is unsafe ($345, 3 pts); owner allowing a non-compliant modification ($518) |
| ACT | $279–$619 | Non-compliant dimensions or tyres, or modification without certification ($279); non-compliant suspension ($336); unsafely maintained vehicle ($619) |
| WA | $100 | Altering a vehicle without approval, or vehicle not complying with standards |
| SA | $533 | Light vehicle in breach of vehicle standards (plus $108 levy) |
| TAS | $213–$852 | Breach of vehicle modification standards ($213); non-compliant modified vehicle ($266.25); unsafe and unroadworthy vehicle ($852) |
| NT | $60 | Driving an unsafe motor vehicle |
Fines for an illegal 4WD lift. On-the-spot fines for light vehicles as at September 2026. Where more than one offence could apply, the min–max range is shown. Source: State and territory penalty schedules. Analysis by OCAM 4x4 Accessories.
Bull bar laws: what makes a bull bar legal?
Bull bars are one of the most popular 4WD add-ons, but there’s more to them than bolting on a lump of steel. They have to meet an Australian safety standard (AS 4876.1-2002), and on newer cars they can’t block the radar and cameras behind the front bumper that run features like automatic emergency braking.
“On a modern car, there’s radar and cameras sitting right behind where the bar mounts,” Peter says. “Fit the wrong bar and you might not find out you’ve blinded your safety systems until the day you need them.”
If your bull bar covers your number plate, the fines climb even higher, reaching $1,200 in WA.
| State/territory | On-the-spot fine | Offence(s) police can issue |
|---|---|---|
| NSW | $144–$577 | Non-compliant headlights or other standard ($144); non-compliant frontal protection system ($241); dangerous frontal protrusions ($434, 3 pts); number plate obscured ($577, 3 pts) |
| VIC | $209–$836 | Fitting projecting in a way likely to injure ($209); number plate not displayed correctly ($418, 3 pts); vehicle not complying with standards ($836) |
| QLD | $172–$552 | Defective light vehicle ($172, 1 pt); defective vehicle that is unsafe ($345, 3 pts); number plate not clearly legible ($552) |
| ACT | $279–$619 | Non-compliant protrusions or lights, or illegible number plate ($279); unsafely maintained vehicle ($619) |
| WA | $100–$1,200 | Vehicle not complying with standards, including protrusions ($100); number plate obscured ($1,200) |
| SA | $533–$606 | Light vehicle in breach of vehicle standards ($533); number plate obscured by a device ($606) (plus $108 levy) |
| TAS | $159.75–$852 | Lights obscured ($159.75); fitting likely to cause injury, or number plate obscured ($213); unsafe and unroadworthy vehicle ($852) |
| NT | $30–$60 | Number plate not clearly visible ($30); faulty headlights ($50); driving an unsafe motor vehicle ($60) |
Fines for a non-compliant bull bar. On-the-spot fines for light vehicles as at September 2026. Where more than one offence could apply, the min–max range is shown. Source: State and territory penalty schedules. Analysis by OCAM 4x4 Accessories.
Peter’s advice is to choose a bull bar built for your specific 4WD, or to have a professional check the fitting.
“A universal bar might fit, but that doesn’t mean it necessarily works for your car, or potentially within the law,” he says. “Vehicle-specific is always the safest bet.”
Are wheel spacers legal in Australia?
While most rules change at the border, one stays the same everywhere. Wheel spacers, which push the wheels further out for a wider look, are banned in every state and territory unless the car came with them from the factory. The ban comes from the national rulebook for vehicle modifications, Vehicle Standards Bulletin 14 (VSB 14).
“Spacers come up constantly,” Peter says. “People want the wheels sitting out a bit further and don’t realise it’s the one thing that’s illegal in every single state.”
| State/territory | On-the-spot fine | Offence(s) police can issue |
|---|---|---|
| NSW | $144–$241 | Vehicle not complying with standards ($144); unsafe or unserviceable vehicle ($241) |
| VIC | $836 | Modified vehicle not complying with standards, or unsafe vehicle |
| QLD | $172–$518 | Defective light vehicle ($172, 1 pt); defective vehicle that is unsafe ($345, 3 pts); owner allowing a non-compliant modification ($518) |
| ACT | $279–$619 | Modification contrary to standards ($279); non-compliant road wheels ($336); unsafely maintained vehicle ($619) |
| WA | $100 | Fitting wheel spacers without approval (listed by name in the regulations) |
| SA | $533 | Light vehicle in breach of vehicle standards (plus $108 levy) |
| TAS | $213–$852 | Breach of vehicle modification or wheel standards ($213); non-compliant modified vehicle ($266.25); unsafe and unroadworthy vehicle ($852) |
| NT | $60 | Driving an unsafe motor vehicle |
Fines for fitting wheel spacers. On-the-spot fines for light vehicles as at September 2026. Where more than one offence could apply, the min–max range is shown. Source: State and territory penalty schedules. Analysis by OCAM 4x4 Accessories.
Will the rules be the same nationwide?
Change for 4WD owners could be on the way. The National Transport Commission agreed in 2022 that the rules should be the same nationwide, and in 2024 it backed a plan to update the national rulebook for vehicle modifications.
Until then, Peter’s advice is to:
- Check your state’s limits before you order parts
- Find out whether an engineer’s sign-off will be recognised if you move interstate
- Get approval before you start if you’re in WA
“One set of rules would make our job easier and our customers safer,” he says. “Until then, our advice is simple: check before you build, not after.”
Frequently asked questions
How high can you lift a 4WD without an engineer in Australia?
It depends on where the vehicle is registered. The Northern Territory allows 100mm, NSW, Victoria and Queensland allow 75mm (with no more than 50mm from the suspension), and South Australia, Tasmania, the ACT and Western Australia allow 50mm.
Do bigger tyres count towards the lift limit?
Yes, by half. A tyre that’s 50mm taller raises the vehicle by 25mm, and that counts towards your state’s total.
Are wheel spacers legal in Australia?
No. Wheel spacers are banned in every state and territory unless the vehicle came with them from the factory.
What makes a bull bar legal?
A bull bar has to meet Australian Standard AS 4876.1-2002, and on newer cars it can’t block the radar and cameras that run safety features like automatic emergency braking. It also can’t obscure your number plate.
Build your 4WD the right way
Whether you’re planning a lift, a new bar or bigger wheels and tyres, the right parts make it easier to stay on the right side of the rules, wherever you’re driving. At OCAM 4x4 Accessories, we stock vehicle-specific bull bars, nudge bars, lift kits, suspension upgrades and wheels, properly engineered and tested for your exact model rather than a generic fit.
Browse our range for your 4WD today, and check your state’s rules before you build.
Methodology
Lift limits are drawn from each state and territory’s published modification rules, including Transport Victoria’s VSI 8, the Northern Territory’s Information Bulletin V32 and Transport WA’s light vehicle modification guidance, and apply to lifts without engineering certification. The wheel spacer ban is set out in VSB 14, the National Code of Practice for Light Vehicle Construction and Modification. Fines are the on-the-spot penalties for light vehicles as at September 2026, taken from each state and territory’s official penalty schedule. Where a fine is set in penalty units, it has been converted at the 2026–27 unit value. Court maximums are higher, and SA fines attract an extra $108 Victims of Crime Levy.
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