How Much Does an Ignition Interlock Device Cost in 2026?
Quick Answer: The average ignition interlock device costs between $70 and $150 to install, with monthly monitoring fees of $60–$90. Over a typical 6‑month requirement, total expenses range from $900 to $1,500. Factors like state mandates, provider, and vehicle type influence the final price.
Understanding the full cost of an ignition interlock device (IID) is essential if you've been ordered to install one after a DUI. Many drivers are surprised to learn that fees go beyond the initial installation. Whether you're dealing with a DUI conviction or a state requirement, understanding the full price—including installation, monthly monitoring, and potential calibration fees—is essential. If you're also budgeting for vehicle re-registration after a suspension, our guide on how much a smog check costs can help you plan.
What Is an Ignition Interlock Device?
An ignition interlock device is a breathalyzer wired into a vehicle’s ignition. Before starting the car, the driver must blow into the device. If the blood‑alcohol concentration (BAC) exceeds the preset limit (often 0.02%), the vehicle won’t start. Random retests during driving may also be required. These devices are typically mandated by courts or state motor vehicle departments following a DUI conviction.
Average Cost Breakdown: Installation + Monthly Fees
The total ignition interlock device cost has two main parts: a one‑time installation fee and an ongoing monthly lease fee. Additional charges for calibration, removal, or early cancellation may also apply.
| Cost Component | Price Range | Notes |
|---|---|---|
| Installation | $70 – $150 | One‑time fee; varies by vehicle wiring complexity |
| Monthly monitoring / lease | $60 – $90 / month | Covers data reporting, customer support, and regular calibrations |
| Calibration (if not included) | $10 – $25 / visit | Often bundled in monthly fee; some providers charge separately |
| Removal | $50 – $100 | Usually one‑time when requirement ends |
| Restocking / early termination | $0 – $150 | May apply if you cancel before the mandated period |
Many providers advertise all‑inclusive monthly plans that cover installation, calibration, and removal. However, it’s critical to read the fine print to avoid hidden fees.
Ignition Interlock Device Cost by State
Pricing varies across the United States, partly due to state‑mandated features and the number of approved vendors. Below are examples for several states, based on data from leading IID providers and state motor vehicle reports.
- California: Installation $80–$120, monthly $65–$85. Some counties require GPS or camera add‑ons.
- Texas: Installation $70–$110, monthly $60–$80. Larger cities may have multiple providers competing on price.
- Florida: Installation $75–$130, monthly $65–$85. Certified providers must follow Florida Department of Highway Safety guidelines.
- Virginia: Installation $90–$150, monthly $70–$90. Virginia mandates specific device standards, slightly raising costs.
- Arizona: Installation $75–$125, monthly $65–$85. MVD oversight includes strict calibration schedules.
- Washington: Installation $80–$140, monthly $65–$85. Some installers offer discounts for prepaid 6‑month leases.
Always check with your state’s approved IID provider list, as using a non‑certified vendor can lead to penalties. Comparing at least two quotes from Intoxalock or Smart Start often yields the best deal.
Leasing vs. Buying an Ignition Interlock Device
Nearly all drivers lease the device because ownership isn’t practical for a temporary requirement. Purchasing a unit outright would cost $1,000–$2,000, plus ongoing calibration and data fees. Leasing is almost always the more economical choice, especially since the device must be removed after the mandated period.
Factors That Influence the Price
- State requirements: Cameras, GPS, or real‑time reporting can add $10–$25/month.
- Vehicle type: Luxury or hybrid vehicles may require more labor for installation.
- Length of requirement: Longer terms often come with lower monthly rates.
- Provider competition: Areas with multiple certified vendors tend to have better pricing.
Tips to Reduce Your IID Cost
- Request all‑inclusive quotes from at least three state‑approved providers.
- Ask about discounts for prepaying 6 or 12 months upfront.
- Check if your car insurance offers any IID‑related discounts (rare but possible).
- Ensure you complete the full mandated term to avoid early‑removal penalties.
- Keep the device calibrated on time to prevent lockout fees.
Common Mistakes to Avoid
- Choosing a non‑certified installer: Your state will reject the device, costing you time and money.
- Ignoring monthly fees: Some people focus only on the installation cost and underestimate the total expense.
- Not asking about hidden charges: Always clarify removal, lockout, and damage fees before signing.
- Driving a vehicle after a failed test: This can lengthen your IID requirement and add legal costs.
Sources: NHTSA – Ignition Interlock Devices, Intoxalock Pricing, Smart Start Cost Overview.
Frequently Asked Questions
How much does an ignition interlock device cost per month?
Monthly monitoring fees typically range from $60 to $90. This usually covers calibration, data reporting, and 24/7 support.
Is the installation fee included in the monthly rate?
It depends on the provider. Some offer an all‑inclusive lease with installation rolled into the monthly charge, while others bill it separately upfront.
What state has the lowest IID cost?
Generally, states with many approved vendors, like Texas and Florida, see competitive pricing. However, exact costs depend on the provider and vehicle.
How long does an ignition interlock device stay on my car?
Requirement lengths vary by state and offense. They typically range from 6 months to 2 years, sometimes longer for repeat offenses.
Can I get financial help for an IID?
Some states offer indigent programs that reduce or cover IID costs for low‑income drivers. Check with your court or DMV for availability.
What happens if I miss a calibration?
The device may enter a lockout mode, preventing the vehicle from starting. You'll need to tow the car to a service center at your expense.
Disclaimer: The information provided on this website is for general informational purposes only and does not constitute legal, medical, or financial advice. You should consult with a qualified professional for advice tailored to your specific situation.