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 scope: 1 year. Confirm your actual notice and license status.

Last updated: 2026-09-07

Required for all DUI offenses

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)

Confirm the device, provider and written quote

Check the responsible authority’s current approval information for the particular device and installer. Request the billing unit, included services, actual paid visit schedule, taxes, fees and removal terms in writing. Confirm financial assistance separately.

Add your own quoted charges in the IID worksheet. Unknown charges stay unknown; no local price or appointment count is assumed.

Restricted License with IID

Available

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?

Yes. New Hampshire requires IID for all DWI convictions, including first offenses, for 1 year.

How long do I need an IID in New Hampshire?

First offense: 1 year. Second: 2 years. Third: 3 years. Fourth or more: indefinite.

How much does an IID cost in New Hampshire?

Get a written quote for your vehicle and program. Confirm the billing period, included service, separately paid visits, taxes, state/program fees and removal charges. Verify any financial assistance before assuming a discount. A generic state price range is not your quote.

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Disclaimer: This is informational only, not legal advice. IID requirements, costs, and approved providers change frequently. Verify current requirements with the New Hampshire DMV, your IID provider, or a qualified DUI attorney in New Hampshire.

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Sources

NHTSA: interlock device and program background. This national reference does not verify every state rule above. Confirm the applicable law and current instructions with the authority named on your order or licensing notice.