How to cancel ADT
How to cancel ADT: Have the account holder's ADT account number and verification details ready. This cancel is typically done by phone. Follow the call with written cancellation notice at least 30 days before your term ends or it auto-renews; cancelling mid-contract costs 75% of the remaining monthly charges.
Official steps
- Have the account holder's ADT account number and verification details ready.
- Call ADT at 1-800-238-2727 (1-800-ADT-ASAP) — alarm service cannot be cancelled online.
- Tell the rep you want to cancel; expect a retention offer and decline it.
- Give at least 30 days' written notice before the end of your current term to stop automatic renewal.
- If still inside the 36-month term (24 months in California), expect a 75%-of-remaining-monthly-charges early termination fee unless you qualify for the 6-month money-back guarantee or cancel within the first 30 days.
- Get a cancellation confirmation number and confirm your final billing date.
Do I need an account?
Cancellation is phone-only with no online option, requires the account holder plus 30-day written notice, and mid-contract carries a 75%-of-remaining-balance early termination fee.
Window, fees & policy notes
6-month (180-day) money-back guarantee on professionally installed systems; phone-only cancel (no online), 30-day written notice to avoid auto-renewal, and a 75%-of-remaining-monthly-charges early termination fee inside the 36-month term (24 months in California).
What you do yourself
Phone: 1-800-238-2727 (1-800-ADT-ASAP)
Gotcha: Follow the call with written cancellation notice at least 30 days before your term ends or it auto-renews; cancelling mid-contract costs 75% of the remaining monthly charges.
Sources
- https://www.adt.com/about-adt/legal/diy-terms-of-service
- https://www.adt.com/help/faq/account-management/cancel-service
- https://help.adt.com/cancel-account
- https://cancelmates.com/guides/hardest-subscriptions-to-cancel-guide
Playbook verified 2026-07-12 · confidence: high