Signal Mountain, TN ignition interlock: 1 certified installer
1 in town, 10 more within reach of Signal Mountain
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1 certified center in Signal Mountain, run by 1 provider. Addresses below — call ahead, most centers fit devices by appointment.
Certified installation centers in Signal Mountain
Sorted by how far they are from the center of Signal Mountain. Where two providers work out of the same garage, we list the garage once with both names, and we include nearby towns when their center is closer than one of your own.
Compiled from providers’ own public location directories and deduplicated to unique physical places (how we build this index). Listing is not an endorsement, and no center pays to appear.
Not sure which center to call?
Send your details once and certified installers covering Signal Mountain will get in touch with availability and a price for your term. It costs nothing, and you are not committing to anything by asking.
We pass your details only to providers that are certified in Tennessee. We never sell your information on, and you can tell them to stop at any time.
What it costs in Signal Mountain
Interlock pricing is set at state level, so what applies in Signal Mountain applies across Tennessee. Tennessee caps these fees by regulation — a quote above them is not legal.
| Charge | Maximum allowed | What it covers |
|---|---|---|
| Installation | $225 | billed hourly — up to $75 per hour, three hours maximum |
| Monthly | $125 | covers lease, monitoring and maintenance |
| Removal | $75 | Taking the device out at the end of your term |
State-capped maximum — a provider may not charge more · Rules of Ignition Interlock Device Program, Chapter 1340-03-06 — TN Department of Safety · effective 2020-05 · checked 2026-08-23
The fees nobody quotes you over the phone
These are charged on top of the three above, and they are where a cheap-looking Tennessee quote turns expensive.
| Fee | Amount |
|---|---|
| Permanent lockout reset (after five or more violations) | up to $50 |
| Temporary lockout code | up to $25 |
| Annual administrative fee | $12.50 |
- Providers must post their fee rates visibly in the service center office.
What Tennessee requires
Tennessee runs the program through the court: you need an Order for Restricted Driver License signed by a judge before any provider will fit the device, plus SR-22 insurance. The order is also what the provider uses to calculate how long you serve, so the paperwork sets the clock.
- First offense: Set by the court order for a restricted license (form ORDL signed by the judge), which the provider uses to calculate your time in the program
- Lockout threshold: Set by the preset limit in the certified device: the state defines it as blocking the vehicle at or above that reading
- Program run by: The sentencing court, with the restricted license issued by TN Department of Safety
Why Tennessee orders these devices
An interlock order is not a judgment about you personally — it is what the state does with every case of this kind, and the reason sits in the crash record.
Source: NHTSA Fatality Analysis Reporting System, 2020–2022. The count covers fatal crashes where police recorded that a driver had been drinking, which is narrower than the federal 0.08 BAC measure and therefore understates the real figure. Hamilton County runs above the Tennessee average, which is part of why the interlock requirement here is enforced the way it is. What the device changes is measurable too: a car fitted with one cannot be started over the limit, which is why the order attaches to driving privileges rather than to the sentence.
Other cities in Tennessee
If nothing in Signal Mountain works for you, a center one town over often has an earlier appointment — the price does not change.
Interlock questions in Signal Mountain
Where can I get an ignition interlock device installed in Signal Mountain, TN?
We index 1 certified installation point in Signal Mountain, run by Intoxalock. Addresses are listed above. Book with the provider your paperwork names, not the nearest one — a device approved in one state is not automatically approved in the next, and switching brands mid-term means a second installation fee.
How much does it cost to have an ignition interlock device installed in Tennessee?
Tennessee publishes its own figures rather than leaving it all to vendors: up to $225 to fit the device and up to $125 a month while it stays on the car, and the monthly figure is a ceiling an approved provider may not exceed. Removal is billed separately at the end of the term.
Can I drink one beer and still start the car in Tennessee?
Almost certainly not. Tennessee does not print one fixed number in the statute — the level is set by the certifying agency in the device standard, typically between 0.02% and 0.025% BAC, far below the 0.08% driving limit. The device is not testing whether you are impaired, it is testing whether you drank. One drink shortly before a test is enough on most programs, and the fail is recorded whether or not you try again.
What does an ignition interlock device do?
An ignition interlock is a breath-alcohol tester wired into your car ignition. You blow into it before starting the engine; if your breath alcohol is above the state threshold, the engine will not start.
While you are driving, the device asks for rolling retests at random intervals. Every sample, skipped test, and lockout is recorded and sent to the agency monitoring your case.
All Tennessee cities →Why Tennessee requires it →What it costs in Tennessee →DUI lawyers in Tennessee →If the device recorded a violation →