Ignition Interlock Device (IID) in New Hampshire
New Hampshire uses the term "DWI" for impaired driving offenses. IID requirement: required for all dui offenses. First offense duration: 1 year. Monthly cost: $65-$100.
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Quick Answer
New Hampshire requires IID for all DWI convictions, including first offenses, as a condition of license reinstatement.
IID Duration by Offense
| Offense | IID Duration |
|---|---|
| 1st Offense | 1 year |
| 2nd Offense | 2 years |
| 3rd Offense | 3 years (minimum) |
| 4th+ Offense | Indefinite (until court/DMV approval for removal) |
BAC threshold: Any DWI conviction (no BAC threshold — all offenders)
IID Cost Breakdown in New Hampshire
| Item | Cost | Notes |
|---|---|---|
| Installation | $75-$150 | One-time fee. Takes about 1 hour. |
| Monthly Lease + Monitoring | $65-$100/mo | Includes device lease and monitoring. |
| Calibration | $25-$75 | Every 60 days. |
| Removal | $50-$100 | One-time fee when IID period ends. |
| Estimated Total (6 months) | $515-$850 | Install + 6 months lease + removal. |
| Estimated Total (12 months) | $905-$1,450 | Install + 12 months lease + removal. |
One-time
Lease + monitoring
Every 60 days
One-time
All-in estimate
All-in estimate
Approved IID Providers in New Hampshire
Contact providers directly for current pricing and service center locations in New Hampshire. Compare at least 2-3 providers before choosing — prices and service quality vary.
Restricted License with IID
New Hampshire issues a conditional license with IID for essential driving.
Tampering / Circumvention Penalties
Tampering with an IID in New Hampshire carries fines, jail time, and extension of the IID period.
Early Removal
New Hampshire does not allow early removal.
New Hampshire-Specific Notes
New Hampshire requires IID for all offenders. Fourth or subsequent offenders face an indefinite IID requirement.
Frequently Asked Questions
Is an IID required for a first DWI in New Hampshire?
How long do I need an IID in New Hampshire?
How much does an IID cost in New Hampshire?
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