Who has to install one in South Carolina
Program run by: SC Dept of Probation, Parole and Pardon Services (PPP) Ignition Interlock Program · agency page
Law: S.C. Code 56-5-2941 (framework), 56-5-2990 (duration), 56-1-286, 56-1-1090
For the rule that applies to you, read your court order or the letter from the DMV.
A judge can order an interlock in other cases too. Your court order or DMV letter is what binds you.
Where each company can install in South Carolina
You'll go back to the same company's locations for service for the whole order, so check that one is close to where you live and work before you book.
Locations as each company lists them on its own locator (Smart Start, Intoxalock, LifeSafer), pulled Oct 2026. Some shops serve more than one company. Alcohol Detection Systems doesn't publish a locator we could read.
Interlock companies approved in South Carolina
Smart Start
Listed as “A-1 Smart Start”- In South Carolina
- 43 service locations listed
- Nationwide
- On 40 of 44 state lists
- 12 months, filed fees
- $1,460–$1,510
- App rating
- 2.0 from 113 (App Store)
- In South Carolina
- 37 service locations listed
- Nationwide
- On 37 of 44 state lists
- 12 months, filed fees
- $1,427–$1,552
- App rating
- 1.7 from 899 (App Store)
- In South Carolina
- 25 service locations listed
- Nationwide
- On 34 of 44 state lists
- 12 months, filed fees
- $1,205–$1,355
- Nationwide
- On 28 of 44 state lists
From the state's approved list (read it). Use a company on this list, or the install won't count. 12-month figures are lease, install and removal from each company's filed or published fee schedule, not South Carolina prices; see how we add them up.
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InterlockCompare is independent and doesn't make, sell or install interlocks. Not legal advice.