Alarm System Takeover: Switch Monitoring, Keep the Panel
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If you already own an alarm system and you want a different company to monitor it, the industry word for that is a takeover. The panel, the door and window contacts, the motion sensors and the keypads all stay exactly where they are. What changes is the service account, and often the small cellular radio that carries the signal out of your house.
Search for this and you will find dozens of pages, nearly all published by alarm dealers, that describe the process in three cheerful steps and end at a quote form. They are not wrong, but they consistently leave out the two things that actually decide whether your takeover happens: whether you can get into the panel's programming, and whether your old company will let go of the radio. This page starts with those, because if either answer is no, nothing else on the page matters.
The two gates that decide everything
Gate 1: the installer code
Every alarm panel has a user or master code that arms and disarms it, and a separate installer code (sometimes called a dealer code) that unlocks programming. A takeover usually means reprogramming where the panel reports to, so the new company needs programming access.
Alarm Grid, one of the independent monitoring companies that does this work, states plainly in its own takeover documentation that for some systems it will be necessary to know the panel's installer code or master code, and that monitoring companies may lock users out of programming by using a secret installer code that prevents a takeover. That second sentence is the part the marketing pages skip. A locked panel is not a technical fault; it is a business decision made by whoever installed it.
Default installer codes are widely published because legitimate owners get locked out constantly. Alarm Grid's public compatibility table lists them per panel family, and the common ones are below. If a default works, you were never locked. If it does not, the panel was either changed by the installer or locked deliberately.
Gate 2: the communicator, and who owns the account attached to it
Modern panels report over a cellular radio, an internet connection, or both. A cellular radio can only belong to one monitoring account at a time. Alarm Grid's documentation states that any communicator previously used with another company should be released by that company before activating with a new one, and that this is not optional for Alarm.com communicators, which must always be released or replaced.
Surety, another independent provider, describes the same thing from the customer's side: the module is either registered to an active account or unregistered and available. Its guide also names the failure mode worth knowing about in advance, which is that some providers keep the account active after you cancel, leaving your module registered and blocking a clean switch. If your module still shows as registered a day or two after cancelling, that is something to go back to the old provider about.
There is a second communicator problem that has nothing to do with anyone's business practices. Panels sold with 2G, 3G or CDMA radios can no longer report at all, because those networks have been retired. Alarm Grid's own table flags this for older panels, noting for example that the Honeywell L5000 supports 2G cellular only, which is no longer available. If your system has been sitting unmonitored for several years, budget for a replacement LTE radio as the likely outcome rather than the exception.
The order that saves you a headache: confirm your panel model and installer code first, confirm the communicator is LTE and can be released second, and only then cancel your existing service. Cancelling first is the common mistake, because it leaves you with an unmonitored house while you find out whether the takeover was ever possible.
Which panels are realistically takeoverable
The table below is a summary of the panel families that independent monitoring companies publicly document as takeover candidates, along with the default installer code each family shipped with and the usual catch. It is condensed from Alarm Grid's own compatibility table, which is the most detailed public list we could find and which lives in a product FAQ rather than anywhere a normal person would look. Treat it as an orientation, not an install guide: your specific revision, firmware version and communicator all matter, and the provider will confirm them.
| Panel family | Default installer code (as published) | The usual catch |
|---|---|---|
| Honeywell / Ademco Vista (10P, 15P, 20P, 21iP) | 4112 | Widely supported. Needs an IP or LTE communicator; several communicator options require panel version 9.12 or higher for app control |
| Honeywell Vista commercial (40, 50P, 128BPT, 250BPT) | 4140 | Supported, but the 40 and 50P do not support Honeywell's app platform at all, so expect central-station reporting only |
| ADT SafeWatch Pro 2000 / 3000 | 6321 | These are ADT-badged Vista panels, so they are takeoverable in principle. In practice the installer code is frequently changed. See our guide to reusing old ADT equipment |
| Honeywell LynxTouch (L3000, L5100, L5200, L5210, L7000) | 4112 | Panel-specific. The L5000 and L5100 have no LTE upgrade path, so they are limited to internet-only reporting |
| DSC PowerSeries / Neo / Pro | 5555 | Well supported. Older PowerSeries needs panel version 4.2 for the Alarm.com module; Neo needs version 1.1 or higher |
| Qolsys IQ Panel family | 1111 installer, 2222 dealer | No external radio needed, but the internal module must be released by the previous company. No workaround |
| 2GIG GC2 / GC2e / GC3 / GC3e | Panel-specific | Communicator must be released by the previous provider, and the panel usually needs a firmware update first |
| Interlogix / GE (Simon XT, XTi, Concord 4, NetworX) | 4321 (Simon XT), 9713 (NetworX) | Supported, though several of the original radios are discontinued and any existing one still needs releasing |
| Ring, SimpliSafe, Vivint, Abode and similar | Not applicable | Not takeoverable. These report only to their own manufacturer's service by design. No independent company can monitor them |
That last row is the one worth reading twice, because it is the honest answer for a large share of people who arrive at this question. If your system came from Ring, SimpliSafe, Vivint or a comparable app-first brand, "switch monitoring companies but keep the hardware" is not an option that exists. Your real choices are that vendor's own plans, self-monitoring inside its app where the brand supports it, or replacing the equipment. Our guide to systems with no monthly fee covers the self-monitoring route and its limits, and our system-choosing guide covers starting over.
What a takeover costs, and what it saves
The economic case for a takeover is simple: you are not buying sensors again. The figures below are the entry-level published prices from each provider's own site as of the access dates in the Sources section. We have no commercial relationship with any of them, we have not tested their monitoring response, and we are not ranking them.
| Provider | Published entry price (verify before buying) | Platform focus |
|---|---|---|
| Alarm Grid | Advertises no-contract monitoring starting at $10 a month | Multiple panel platforms, including Honeywell, DSC, Interlogix, 2GIG, Qolsys and NAPCO |
| Surety | Plans with professional monitoring published from $19 a month, month to month, no setup or cancellation fee. Self-monitoring is $5 less per plan | Alarm.com only, so Qolsys and 2GIG panels primarily |
| GeoArm | Advertises no-contract monitoring from around $8 a month | Multiple platforms |
| Traditional dealer, reactivated | Commonly $35 to $60 a month, frequently on a multi-year agreement | Their own equipment and platform |
Two honest caveats about that table. First, entry prices usually mean sensors only: cameras, automation and video verification cost more on every platform, and the tiers are not directly comparable across providers. Second, a low monthly figure is not automatically the better deal if the takeover needs a $150 to $250 replacement communicator to happen at all. Put both numbers into our five-year cost calculator before deciding, because a one-off hardware cost against a $25-a-month saving pays for itself quickly, while the same hardware against a $5 saving does not.
The sequence, in the order that works
- Identify the panel, not the keypad. On wired systems the model number is on the board inside the metal enclosure, not on the keypad by the door. If you inherited the system with the house, our inherited alarm system guide covers identification and the code problem in more detail.
- Find the communicator and its identifier. Providers ask for the IMEI or MAC and CRC of the radio. Surety's guide notes the IMEI is 15 digits and is usually on a label on the radio, in the panel's settings under About or Cellular, or on the original box.
- Test whether you have programming access before you commit to anything. Getting into and straight back out of programming with a default code costs nothing and answers Gate 1.
- Ask the prospective provider for a written yes or no on your exact model, revision and radio. Every company on this page invites that question, and it is free.
- Read your current agreement for the cancellation terms before you cancel anything. Traditional contracts often carry an early termination fee based on the remaining balance; our costs and contracts guide explains what to look for.
- Cancel, and confirm the release. Then verify the module actually shows as unregistered rather than assuming it did.
- Activate, then re-verify the whole system. Arm it, trip a door, and ask the new monitoring center to run a signal test with you on the phone. A takeover that reports nothing is worse than no monitoring, because you think you are covered.
- Update your alarm permit. Many cities register the permit against the monitoring company as well as the address, and false-alarm fines follow the permit holder. Our alarm permit and false-alarm fine guide covers how to check your city.
When a takeover is the wrong answer
- The panel is locked and cannot be defaulted. At some point the labour of chasing a lockout costs more than a new system. A provider that tells you this honestly is worth more than one that keeps you hoping.
- The system predates the panel families above. Very old boards can often still be made to report, but you inherit obsolete sensors, no app, and no replacement parts.
- You wanted cameras and automation anyway. If the plan involves buying most of a new system regardless, keeping a fifteen-year-old panel at the centre of it is a false economy.
- Nobody will be arming it. Monitoring an alarm nobody sets is a subscription to nothing. If that is the honest situation, the better spend is on locks, lighting and our free home security checklist.
Where to go next: if you are still deciding whether you want a monthly fee at all, start with our monitoring guide, which lays out what professional monitoring does and does not do. If the system you own is an ADT-branded one, read what you can and cannot do with old ADT equipment first, because that brand is the single most common reason a takeover stalls.
Sources
- Alarm Grid - Which Systems Can Alarm Grid Take Over? (panel compatibility table, default installer codes, communicator release requirement, 2G availability note) (accessed 2026-08-01)
- Alarm Grid - Alarm Monitoring for Your Existing System (definition of a takeover; proprietary equipment and secret installer codes as blockers) (accessed 2026-08-01)
- Alarm Grid - No-contract alarm monitoring starting at $10 a month (accessed 2026-08-01)
- Surety Home - Monitoring an Alarm.com System You Already Have (registered vs unregistered modules, the account-not-terminated failure mode, IMEI location, published plan pricing) (accessed 2026-08-01)
- Surety Home - Plans and pricing (accessed 2026-08-01)
- GeoArm - No-contract alarm monitoring services (accessed 2026-08-01)