Updated: April 2025 | Reading time: ~7 minutes | Verified sources used
Short answer: a 6-month alcohol interlock program in Australia typically costs between $1,300 and $1,700, and a 12-month program can reach $2,000 to $3,000. But the full picture depends on your state, your vehicle, and a few fees most people don't see coming. This guide breaks all of it down clearly.
In This Article
What Is an Alcohol Interlock Device?
An alcohol interlock is a breathalyser connected directly to your car's ignition. Before the engine starts, you blow into the device. If your blood alcohol concentration (BAC) is above the set limit — which is zero or near-zero for program participants — the car simply won't start.
It's not a punishment designed to embarrass you in a supermarket car park (although blowing into a tube while your neighbour watches from across the road does feel a little theatrical). It's a genuine road safety tool, and the data backs it up.
In Australia, drink driving is linked to approximately 30% of road fatalities each year, according to Guardian Interlock. Interlocks are one of the most evidence-based responses to that problem. They don't just punish — they physically prevent impaired driving while someone works through a court-ordered program.
All Australian states and territories run mandatory interlock programs for convicted drink drivers. Each program has its own structure, but the core is the same: install the device, use it correctly, attend regular servicing, and remove it when the program ends.
🔗 Related reading: Want to understand how official programs and protocols work in practice? Check out our guide on understanding official emergency protocols — useful context for anyone navigating a government-mandated requirement.
The Three Main Costs You'll Pay
People get confused because there isn't one single fee. There are three distinct cost categories, and they all hit at different times.
1. Installation Fee One-off
This is the biggest single upfront payment. It covers fitting the device to your vehicle, training, and paperwork. According to Smart Start Interlocks, installation starts at around $160 for concession holders in a standard car. Without a concession card, expect to pay $350 or more. Newer vehicles with push-button start, hybrid systems, or OBD2 ports — essentially most cars made after 2015 — attract additional hourly labour fees.
Transport Victoria estimates standard installation and training from $175. In NSW, Affordable Interlock Systems lists installation from $350, with motorcycles at $450.
2. Monthly Lease and Servicing Fee Ongoing
This is the fee that quietly becomes your biggest total expense. It covers device lease, calibration, data download, and transmission to your state transport authority. In Victoria, leasing and servicing starts from $160 per month, plus the government program fee of $40.80 per month (the 2024/2025 rate confirmed by RACV). That's roughly $200 a month before unexpected costs.
Smart Start puts their concession monthly rate from $106 per month — roughly $3.50 a day, which is indeed the price of a small flat white. In NSW, Affordable Interlock Systems lists monthly fees at $190 including download, calibration, and camera.
3. Removal Fee One-off at end
When your program concludes, the device comes out. In Victoria, removal starts from $100, per RACV. Removal typically takes up to two hours of a technician's time. It's the cost most people forget about — don't be that person who's surprised at the finish line.
A full 6-month program including removal typically costs $1,300–$1,700. A 12-month Queensland program is estimated at around $2,000, according to Queensland Traffic Lawyers. Annual costs nationally can range from $1,500 to $3,000, per Guardian Interlock.
State-by-State Cost Breakdown
Australia doesn't do anything the simple way, and alcohol interlock pricing is no exception. Each state sets its own fees, program lengths, and concession structures.
| State | Est. Installation | Monthly Fee (approx.) | Min. Program Length | Govt. Monthly Fee |
|---|---|---|---|---|
| Victoria (VIC) | From $175 | From $160 | 6 months | $40.80 |
| New South Wales (NSW) | From $350 | ~$190 | Varies by offence | Included |
| Queensland (QLD) | Quoted on vehicle | Varies by provider | 12 months | — |
| Western Australia (WA) | Quoted on vehicle | Monthly servicing required | Varies | — |
Sources: RACV, NSW Government, Affordable Interlock Systems, Smart Start Interlocks, Dräger Australia. Confirm current pricing directly with your approved provider.
Victoria
Victoria runs one of Australia's most structured programs. The mandatory interlock period spans 6 months to 4 years depending on the offence. The state charges $40.80/month in program fees (2024/25), with $160+/month from providers plus installation and removal on top.
New South Wales
NSW operates a court-ordered mandatory program covering mid-range, high-range, repeat, and serious offences. Four approved providers operate across the state. Installation starts around $350 and monthly fees around $190 including camera and calibration, per Affordable Interlock Systems' published NSW pricing.
Queensland
The QLD program applies to repeat and high-range drink drivers, with a 12-month minimum. Total cost over that period is estimated at around $2,000, according to Queensland Traffic Lawyers. From 1 May 2025, the final calibration cost was updated to $80, per Smart Start's updated QLD program page. Concession holders receive a 35% discount from Dräger.
Western Australia
WA runs the Alcohol Interlock Scheme through Dräger and other approved providers. Monthly servicing is compulsory. Concession cardholders receive a $50 discount on rental and service fees, per Dräger's WA program page. Complex vehicles (2016+, hybrids, push-start) attract additional labour charges, quoted at booking.
🔗 Also on BigWriteHook: Trying to quickly work out a concession discount? Our piece on what 20 percent of 1300 equals gives a practical walkthrough of percentage calculations — useful when providers quote discount rates.
Hidden Fees to Watch Out For
Most providers are transparent, but a few charges can catch people off guard. Ask about all of these before you sign anything.
- Lockout fees: If your device locks out, you'll need a tow or a temporary unlock code. These are regulated at around $50, per Smart Start, so shopping around won't help — but budgeting for them will.
- Non-standard vehicle surcharges: Push-button ignition, stop-start systems, and OBD2 ports add labour. Ask for a full quote based on your specific make and model before booking.
- Violation extensions: Recording a violation — even an accidental one — can restart your performance period. In practice, that means more months of monthly fees. Every violation has a financial consequence.
- Vehicle transfer fees: If you change cars during the program, transferring the interlock costs extra. Ask upfront if there's any chance your vehicle situation might change.
Concessions and Financial Help
Concession pricing is available in every state, and it makes a genuine difference. The catch: you have to ask for it and bring the card every time. It isn't applied automatically.
In Queensland and NSW, Dräger offers 35% off installation, rental, service, and removal for eligible concession cardholders. Smart Start lists their concession installation from $160. In Victoria, concession holders pay $20.40/month in government fees — half the standard rate — plus a $50 provider reduction, per RACV. In WA, Dräger applies a $50 discount on rental and service for current concession cardholders.
Bring your concession card to your installation appointment and to every service visit. It must be current and in your name as the primary cardholder. Missing it on the day means paying full price — and providers won't backdate a discount.
Low-income participants in Queensland can also apply for financial assistance through the Department of Transport and Main Roads, separate from concession discounts. If cost is a genuine barrier, contact your provider before assuming you can't afford the program.
Is It Worth the Cost?
If you've been ordered to install one, the question shifts from "is it worth it?" to "how do I manage the cost?" — because not installing it means not driving at all, and driving without one is a criminal offence carrying further disqualification.
For the broader question of effectiveness: the answer is clearly yes. Over 85,000 Australians are currently enrolled in interlock programs through Dräger alone. Research consistently shows interlocks reduce repeat drink driving while the device is installed. Guardian Interlock puts it plainly — the long-term savings in lives, legal fees, and insurance costs outweigh the program expense significantly.
A $2,000 interlock program is considerably cheaper than the fine, court costs, and sharply increased insurance premiums that follow a second drink driving conviction. Context matters.
For voluntary installations — yes, that exists — Andatech places total costs at $1,500 to $2,500. Some employers fit them in fleet vehicles. Some individuals install them for personal accountability. It's not exclusively a court-order product.
Frequently Asked Questions
How long do I need an alcohol interlock installed?
It depends on your state and offence. Victoria: 6 months to 4 years. Queensland: minimum 12 months. NSW varies by conviction type. Your court order or transport authority letter will specify your required period.
Can someone else drive my car with an interlock fitted?
Yes. Other drivers can use the vehicle — they just need to pass the breath test too. In Queensland, this is explicitly permitted, provided the nominated vehicle always carries the device.
What happens if I can't afford the interlock program?
Apply for concession pricing first. In Queensland, financial assistance is available through the Department of Transport and Main Roads. Opting out is not a neutral decision — in QLD, declining to install means an additional two years without a licence.
Will food or mouthwash cause a false positive?
Modern approved devices are designed to distinguish breath alcohol from incidental sources. Dräger specifically states food, smoking, and mouthwash won't affect results on their devices. That said, it's sensible to avoid using them immediately before a test.
How often is servicing required?
Monthly servicing is standard across most states. In NSW and QLD, some participants may be eligible for bi-monthly or tri-monthly schedules, per Smart Start. Servicing involves a system check, recalibration, and data download. Missing a scheduled service is a program violation.
Can I be exempt from the interlock program?
In Queensland, exemptions exist for participants who live more than 150km from an approved installer, have a medical condition preventing breath testing, or can demonstrate severe hardship beyond normal employment inconvenience. Applications go to the Department of Transport and Main Roads up to six weeks before disqualification ends.
Sources & References
- RACV — Victorian Alcohol Interlock Program (January 2025)
- NSW Government — Alcohol Interlock Program
- Smart Start Interlocks — Pricing (2026)
- Guardian Interlock — Cost vs. Benefit (2024)
- Affordable Interlock Systems — NSW Pricing
- Andatech — The Cost of an Interlock Breathalyser
- Dräger Australia — Queensland Program
- GNL Lawyers — Queensland Alcohol Ignition Interlocks (2025)
- Queensland Traffic Lawyers — Interlock Device Costs
- Smart Start Interlocks — QLD Program (updated May 2025)
- alcohol ignition interlock
- Smart Start Interlocks Australia
Updated: April 2025 | Reading time: ~7 minutes | Verified sources used
Short answer: a 6-month alcohol interlock program in Australia typically costs between $1,300 and $1,700, and a 12-month program can reach $2,000 to $3,000. But the full picture depends on your state, your vehicle, and a few fees most people don't see coming. This guide breaks all of it down clearly.
In This Article
What Is an Alcohol Interlock Device?
An alcohol interlock is a breathalyser connected directly to your car's ignition. Before the engine starts, you blow into the device. If your blood alcohol concentration (BAC) is above the set limit — which is zero or near-zero for program participants — the car simply won't start.
It's not a punishment designed to embarrass you in a supermarket car park (although blowing into a tube while your neighbour watches from across the road does feel a little theatrical). It's a genuine road safety tool, and the data backs it up.
In Australia, drink driving is linked to approximately 30% of road fatalities each year, according to Guardian Interlock. Interlocks are one of the most evidence-based responses to that problem. They don't just punish — they physically prevent impaired driving while someone works through a court-ordered program.
All Australian states and territories run mandatory interlock programs for convicted drink drivers. Each program has its own structure, but the core is the same: install the device, use it correctly, attend regular servicing, and remove it when the program ends.
🔗 Related reading: Want to understand how official programs and protocols work in practice? Check out our guide on understanding official emergency protocols — useful context for anyone navigating a government-mandated requirement.
The Three Main Costs You'll Pay
People get confused because there isn't one single fee. There are three distinct cost categories, and they all hit at different times.
1. Installation Fee One-off
This is the biggest single upfront payment. It covers fitting the device to your vehicle, training, and paperwork. According to Smart Start Interlocks, installation starts at around $160 for concession holders in a standard car. Without a concession card, expect to pay $350 or more. Newer vehicles with push-button start, hybrid systems, or OBD2 ports — essentially most cars made after 2015 — attract additional hourly labour fees.
Transport Victoria estimates standard installation and training from $175. In NSW, Affordable Interlock Systems lists installation from $350, with motorcycles at $450.
2. Monthly Lease and Servicing Fee Ongoing
This is the fee that quietly becomes your biggest total expense. It covers device lease, calibration, data download, and transmission to your state transport authority. In Victoria, leasing and servicing starts from $160 per month, plus the government program fee of $40.80 per month (the 2024/2025 rate confirmed by RACV). That's roughly $200 a month before unexpected costs.
Smart Start puts their concession monthly rate from $106 per month — roughly $3.50 a day, which is indeed the price of a small flat white. In NSW, Affordable Interlock Systems lists monthly fees at $190 including download, calibration, and camera.
3. Removal Fee One-off at end
When your program concludes, the device comes out. In Victoria, removal starts from $100, per RACV. Removal typically takes up to two hours of a technician's time. It's the cost most people forget about — don't be that person who's surprised at the finish line.
A full 6-month program including removal typically costs $1,300–$1,700. A 12-month Queensland program is estimated at around $2,000, according to Queensland Traffic Lawyers. Annual costs nationally can range from $1,500 to $3,000, per Guardian Interlock.
State-by-State Cost Breakdown
Australia doesn't do anything the simple way, and alcohol interlock pricing is no exception. Each state sets its own fees, program lengths, and concession structures.
| State | Est. Installation | Monthly Fee (approx.) | Min. Program Length | Govt. Monthly Fee |
|---|---|---|---|---|
| Victoria (VIC) | From $175 | From $160 | 6 months | $40.80 |
| New South Wales (NSW) | From $350 | ~$190 | Varies by offence | Included |
| Queensland (QLD) | Quoted on vehicle | Varies by provider | 12 months | — |
| Western Australia (WA) | Quoted on vehicle | Monthly servicing required | Varies | — |
Sources: RACV, NSW Government, Affordable Interlock Systems, Smart Start Interlocks, Dräger Australia. Confirm current pricing directly with your approved provider.
Victoria
Victoria runs one of Australia's most structured programs. The mandatory interlock period spans 6 months to 4 years depending on the offence. The state charges $40.80/month in program fees (2024/25), with $160+/month from providers plus installation and removal on top.
New South Wales
NSW operates a court-ordered mandatory program covering mid-range, high-range, repeat, and serious offences. Four approved providers operate across the state. Installation starts around $350 and monthly fees around $190 including camera and calibration, per Affordable Interlock Systems' published NSW pricing.
Queensland
The QLD program applies to repeat and high-range drink drivers, with a 12-month minimum. Total cost over that period is estimated at around $2,000, according to Queensland Traffic Lawyers. From 1 May 2025, the final calibration cost was updated to $80, per Smart Start's updated QLD program page. Concession holders receive a 35% discount from Dräger.
Western Australia
WA runs the Alcohol Interlock Scheme through Dräger and other approved providers. Monthly servicing is compulsory. Concession cardholders receive a $50 discount on rental and service fees, per Dräger's WA program page. Complex vehicles (2016+, hybrids, push-start) attract additional labour charges, quoted at booking.
🔗 Also on BigWriteHook: Trying to quickly work out a concession discount? Our piece on what 20 percent of 1300 equals gives a practical walkthrough of percentage calculations — useful when providers quote discount rates.
Hidden Fees to Watch Out For
Most providers are transparent, but a few charges can catch people off guard. Ask about all of these before you sign anything.
- Lockout fees: If your device locks out, you'll need a tow or a temporary unlock code. These are regulated at around $50, per Smart Start, so shopping around won't help — but budgeting for them will.
- Non-standard vehicle surcharges: Push-button ignition, stop-start systems, and OBD2 ports add labour. Ask for a full quote based on your specific make and model before booking.
- Violation extensions: Recording a violation — even an accidental one — can restart your performance period. In practice, that means more months of monthly fees. Every violation has a financial consequence.
- Vehicle transfer fees: If you change cars during the program, transferring the interlock costs extra. Ask upfront if there's any chance your vehicle situation might change.
Concessions and Financial Help
Concession pricing is available in every state, and it makes a genuine difference. The catch: you have to ask for it and bring the card every time. It isn't applied automatically.
In Queensland and NSW, Dräger offers 35% off installation, rental, service, and removal for eligible concession cardholders. Smart Start lists their concession installation from $160. In Victoria, concession holders pay $20.40/month in government fees — half the standard rate — plus a $50 provider reduction, per RACV. In WA, Dräger applies a $50 discount on rental and service for current concession cardholders.
Bring your concession card to your installation appointment and to every service visit. It must be current and in your name as the primary cardholder. Missing it on the day means paying full price — and providers won't backdate a discount.
Low-income participants in Queensland can also apply for financial assistance through the Department of Transport and Main Roads, separate from concession discounts. If cost is a genuine barrier, contact your provider before assuming you can't afford the program.
Is It Worth the Cost?
If you've been ordered to install one, the question shifts from "is it worth it?" to "how do I manage the cost?" — because not installing it means not driving at all, and driving without one is a criminal offence carrying further disqualification.
For the broader question of effectiveness: the answer is clearly yes. Over 85,000 Australians are currently enrolled in interlock programs through Dräger alone. Research consistently shows interlocks reduce repeat drink driving while the device is installed. Guardian Interlock puts it plainly — the long-term savings in lives, legal fees, and insurance costs outweigh the program expense significantly.
A $2,000 interlock program is considerably cheaper than the fine, court costs, and sharply increased insurance premiums that follow a second drink driving conviction. Context matters.
For voluntary installations — yes, that exists — Andatech places total costs at $1,500 to $2,500. Some employers fit them in fleet vehicles. Some individuals install them for personal accountability. It's not exclusively a court-order product.
Frequently Asked Questions
How long do I need an alcohol interlock installed?
It depends on your state and offence. Victoria: 6 months to 4 years. Queensland: minimum 12 months. NSW varies by conviction type. Your court order or transport authority letter will specify your required period.
Can someone else drive my car with an interlock fitted?
Yes. Other drivers can use the vehicle — they just need to pass the breath test too. In Queensland, this is explicitly permitted, provided the nominated vehicle always carries the device.
What happens if I can't afford the interlock program?
Apply for concession pricing first. In Queensland, financial assistance is available through the Department of Transport and Main Roads. Opting out is not a neutral decision — in QLD, declining to install means an additional two years without a licence.
Will food or mouthwash cause a false positive?
Modern approved devices are designed to distinguish breath alcohol from incidental sources. Dräger specifically states food, smoking, and mouthwash won't affect results on their devices. That said, it's sensible to avoid using them immediately before a test.
How often is servicing required?
Monthly servicing is standard across most states. In NSW and QLD, some participants may be eligible for bi-monthly or tri-monthly schedules, per Smart Start. Servicing involves a system check, recalibration, and data download. Missing a scheduled service is a program violation.
Can I be exempt from the interlock program?
In Queensland, exemptions exist for participants who live more than 150km from an approved installer, have a medical condition preventing breath testing, or can demonstrate severe hardship beyond normal employment inconvenience. Applications go to the Department of Transport and Main Roads up to six weeks before disqualification ends.
Sources & References
- RACV — Victorian Alcohol Interlock Program (January 2025)
- NSW Government — Alcohol Interlock Program
- Smart Start Interlocks — Pricing (2026)
- Guardian Interlock — Cost vs. Benefit (2024)
- Affordable Interlock Systems — NSW Pricing
- Andatech — The Cost of an Interlock Breathalyser
- Dräger Australia — Queensland Program
- GNL Lawyers — Queensland Alcohol Ignition Interlocks (2025)
- Queensland Traffic Lawyers — Interlock Device Costs
- Smart Start Interlocks — QLD Program (updated May 2025)
- alcohol ignition interlock
- Smart Start Interlocks Australia
