The short answer
ADT professionally installed plans default to a 36-month (3-year) monitoring contract. ADT+ self-setup is month-to-month with no commitment. The two things buyers most often miss: (1) the contract auto-renews unless you give written notice 30–60 days before the term ends, and (2) the ETF — approximately 75% of your remaining balance — can reach ~$1,192 as late as month 6. Signing is a financial commitment that deserves the same scrutiny as a loan.
Key takeaways
This guide covers what the 36-month commitment actually means in financial terms, what happens when the term ends, and a 7-item pre-signing checklist to use before you sign anything.
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| Plan Type | Contract Length | ETF | Auto-Renews? | Equipment model |
|---|---|---|---|---|
| ADT Professionally Installed (standard) | 36 months | ~75% of remaining balance | Yes — 30-day rolling | Included in contract |
| ADT Professionally Installed (promotional) | 24 months | ~75% of remaining balance | Yes — 30-day rolling | Included in contract |
| ADT+ Self-Setup | None — month-to-month | $0 | No | Purchased outright |
Contract terms vary by dealer and region. Always confirm your specific term in your signed service agreement. ADT+ and professionally installed plans are not interchangeable — they run on different equipment systems.
The 36-month number is a monitoring commitment, not a countdown to freedom. What it means financially: your ETF exposure is highest the day you sign and drops to $0 by month 36. The table below uses ADT's Complete Pro Install monitoring rate ($49.99/mo, April 2026) and the standard 75% ETF formula.
| Point in term | Months remaining | ETF at $49.99/mo Complete (75% formula) | What it means |
|---|---|---|---|
| Month 6 | 30 | ~$1,192 | Leaving this early costs more than a full year of monitoring |
| Month 12 | 24 | ~$954 | One year in — still a significant exit cost |
| Month 18 | 18 | ~$715 | Midpoint — ETF equals 13.5 months of monitoring |
| Month 24 | 12 | ~$477 | Two years in — the exit cost is finally sub-$500 |
| Month 30 | 6 | ~$238 | Six months left — leaving now costs less than two months of monitoring |
| Month 36 | 0 | $0 | Contract complete — ETF is gone. This is your maximum leverage moment. |
Rate escalation adds to the real cost
ADT contracts typically allow annual rate increases of 3–7% after year 1. At 5% annual escalation, a $49.99/mo starting rate (Complete Pro Install) adds approximately $91 to your 36-month monitoring total versus a flat rate. Over a second or third contract cycle, this compounds. Find the rate escalation ceiling in your contract before signing and calculate your worst-case 3-year total.
The total monitoring commitment at $49.99/mo (Complete Pro Install) with no escalation: $1,799.64 over 36 months. Equipment is included in professionally installed ADT plans — but the equipment is proprietary. It stays with the home, cannot easily be transferred to a different monitoring provider, and does not reduce your ETF obligation.
Most buyers think about month 37 once they're already in month 34. Understanding it before signing gives you better leverage and fewer surprises.
| During your 36-month term | After your term expires (month 37+) | |
|---|---|---|
| Monthly bill | Contracted rate (with escalation clause) | Same rate — does not automatically drop |
| Early termination fee | ~75% of remaining balance | ✓ $0 — gone entirely |
| Monitoring continuity | Active | ✓ Continues — no gap unless you cancel |
| Your leverage to leave | Limited by the ETF | ✓ Maximum — you can leave for free |
| Your leverage to renegotiate | Minimal | ✓ Strong — ADT knows your exit cost is $0 |
| Auto-renewal status | Under initial contract terms | Renews per your agreement — action required to stop it |
The critical point: at month 37, monitoring continues and billing continues. The bill does not automatically improve. Auto-renewal kicks in unless you provide written notice within the window specified in your contract — typically 30–60 days before the end of your initial term. Setting a calendar reminder 90 days before your contract end date is the single most valuable action you can take at signing.
Approaching your contract end date now? The full decision guide — including your 4 options (auto-renew, renegotiate, go explicit month-to-month, or switch with $0 ETF) — is here: What happens when your ADT contract ends →
These five misconceptions lead buyers into the most preventable ADT contract surprises.
"The bill drops automatically when the contract ends"
Wrong. When your 36-month term expires, ADT continues billing at your current rate. Monitoring does not stop. Your bill does not automatically improve. Auto-renewal kicks in unless you act within the notice window. The only thing that drops to $0 at contract end is the ETF — not the monthly charge.
"36 months means I'm done paying everything"
Wrong. The 36-month term covers monitoring, not equipment ownership in the traditional sense. ADT's professionally installed equipment is proprietary — it stays with the home after your contract ends but cannot be easily repurposed with a non-ADT monitoring provider. The 36 months is a monitoring commitment, not a full ownership timeline.
"Auto-renewal means I'm trapped forever"
Wrong. Auto-renewal continues your monitoring — but once the initial 36-month term expires, the ETF is $0. You can leave with no financial penalty at any time after your initial term, as long as you give proper written notice. 'Trapped' applies only during the initial term, and only financially via the ETF.
"ADT+ self-setup and professional install work the same way"
Wrong. ADT+ uses a different equipment system and a completely different monitoring model. ADT+ is month-to-month monitoring with equipment purchased outright. Professionally installed ADT uses ADT-proprietary equipment with a 36-month monitoring agreement. A buyer who signs up for professional install and expected ADT+ terms has made a materially different commitment.
"I have no leverage once I sign"
Wrong — in two ways. First, most states provide a 3-day right of rescission on door-to-door sales (check your state). Second, if you move outside ADT's service area, the ETF may be waived. If ADT raises your rate above the contractual ceiling, you may have grounds to dispute. And at the moment your term ends, your leverage is maximum — ETF is $0 and you can leave or renegotiate freely.
Use this before the technician leaves and before you submit any electronic signature.
Get the contract end date in writing
Ask for the exact calendar date your 36-month term expires — not just 'month 36.' Mark it in your calendar. This is the date that controls your auto-renewal window.
Confirm the ETF formula in your specific agreement
Ask: 'If I cancel at month 12, exactly how much do I owe?' The standard formula is 75% of remaining balance, but some contracts use different calculations — verify yours before signing.
Note the auto-renewal notice window
Find the clause specifying how many days before your contract end date you must give written notice to cancel. Typically 30–60 days. Missing this window by a day can lock you into another renewal cycle.
Read the rate escalation ceiling
Find the maximum percentage ADT can raise your monthly rate annually after year 1. Note the ceiling and calculate the worst-case 3-year total cost at that rate.
Confirm whether you're signing with ADT directly or an ADT dealer
Ask: 'Is this agreement directly with ADT, or with an authorized dealer?' If it's a dealer, confirm the dealer's name, contact information, and that the service agreement is still backed by ADT monitoring.
Understand the service transfer clause
If you move during the contract term, what are your options? Ask specifically about: transfer to new address, cancel with ETF, or cancel without ETF if outside ADT's service area. Get the conditions in writing.
Model your exit cost before signing — not after
Use the ETF Calculator to see what it would cost to leave at months 12, 18, and 24 at your specific rate. This sets a realistic mental model of the financial commitment before you sign.
Model your exit cost before you sign
Use the ETF Calculator to see what it would cost to leave at months 12, 18, and 24 at your specific rate. Knowing this before signing — not after — is the difference between a comfortable commitment and a financial surprise. ETF Calculator →
Related reading: How to decode a home security quote — interpreting the risk categories and what to do next · How to read a home security contract — clause-by-clause guide for any brand · What happens when your ADT contract ends — 4 options at term expiry · ADT cancellation fee — the 75% ETF formula with worked examples · How to cancel ADT — 6-step process, post-cancellation billing traps · How to lower your ADT bill without canceling — 6 tactics · Stuck in a home security contract — your 5 mid-contract options · ADT pricing — full 3-year total cost breakdown · ADT review — 2026 full evaluation · SimpliSafe vs ADT — full comparison for contract-wary buyers · Before signing an ADT contract — what to verify before committing to a 36-month contract
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