Security system installation - the agreement is the product

What is security system installation?

Installing a home security system means two separate decisions that get sold to you as one. The first is the physical design - which openings get sensors, where motion coverage overlaps, and where the panel and siren live. The second is the commercial arrangement: who monitors it, and whether the equipment is sold to you outright, leased, or bundled into a monitoring agreement. The second decision outlives the first by years.

Signs you need security system installation

• You have just moved in and inherited an existing panel on the wall with no paperwork, no code, and no idea whether it reports anywhere
• You are relying on a doorbell camera and a couple of plug-in sensors, and you want something that actually calls someone when nobody is home
• Your insurer has asked whether the property has a monitored alarm before quoting or renewing
• The house has a basement door, a garage side door or a rear slider that nobody would hear open
• You travel for stretches at a time, or the house sits empty during the working day
• You have a detached garage, workshop or outbuilding that no current system covers
• A previous system was disconnected when the last provider left, and the wiring and keypads are still in place

Seeing something not on this list? Browse home security problems by symptom →

How security system installation actually works

1. 1

   The walk-through, and what it is actually for

   A designer walks the perimeter and counts openings: exterior doors, ground-floor windows, basement access, garage pedestrian doors, and any window a ladder reaches. They also note where a person would have to walk to get from any entry point to the valuables, because that path is where motion coverage earns its keep.

   Watch forA quote produced without anybody walking the house. A sensor count generated from a package name rather than from your openings is a package sale, not a design.

2. 2

   Layering - perimeter, interior and environmental

   Perimeter devices report an opening being used. Interior motion devices report movement once someone is inside. Well-designed systems layer them so that a failed or bypassed device on one layer is caught on the next. Environmental devices - smoke, carbon monoxide, water, low temperature - are frequently what the system ends up being worth on an ordinary week.

   Watch forA design that is all motion detectors and almost no door and window contacts. Motion-only systems are cheap to install and awkward to live with, because they conflict with pets, and they only alarm after somebody is already inside.

3. 3

   Where the panel and the communicator go

   The panel is the target - an intruder who finds it can attack it. Modern practice puts the panel out of immediate reach and uses a separate keypad by the entry door, with the panel reporting an alarm before the entry delay expires so that smashing it does not stop the signal. Ask specifically how the system behaves if the panel is destroyed during the entry delay.

   Watch forA single all-in-one unit mounted by the front door with no reporting until the entry delay ends. This is a known weakness and vendors do not raise it unprompted.

4. 4

   Professional install versus self-install

   A self-install kit ships to you, mounts with adhesive, and pairs to a hub - genuinely workable in a small, simple, mostly modern home. A professional install brings a designer, physical mounting into the frame rather than onto the trim, and someone who is accountable when a sensor stops reporting. The distinction that matters is not difficulty. It is who is responsible when the system fails silently.

   Watch forSelf-install kits sold with a monitoring agreement attached. The install being free does not make the agreement short, and the two are separable more often than the sales flow implies.

5. 5

   Lease, finance or own - establish this in writing before anything is mounted

   Equipment can be sold to you, financed over a term, or leased so the provider retains title. Leased hardware generally must come off the wall or be paid out if you cancel, cannot be moved to a new address without permission, and cannot be taken over by a competing monitoring company. Financed equipment often carries a separate agreement with its own term that survives cancelling the monitoring.

   Watch forThe word "included". Included with what, for how long, and who owns it at the end are three different questions, and "included" answers none of them.

6. 6

   Installation day and the reporting path

   Devices are mounted and enrolled, the entry and exit delays are set, and the system is put through a test to the monitoring centre so that a real signal is confirmed arriving. The reporting path - cellular, broadband or both - is configured here, and it decides whether the system still reports when the internet drops.

   Watch forLeaving without a live test to the central station. An enrolled sensor and a sensor whose signal has been confirmed at the far end are not the same thing.

7. 7

   Handover, codes and permits

   You should leave the appointment with your user codes, a documented device list, an understanding of how to disarm under duress, and a clear answer on who holds the installer or programming code. Many jurisdictions also require an alarm permit registered before the police will respond, and that is usually the homeowner's obligation, not the installer's.

   Watch forThe installer keeping the programming code without saying so. It is the code that determines whether anyone else can ever service or take over the panel - see our takeover page for why this matters later.

What does security system installation cost?

Equipment ranges from a modest self-install kit to a professionally designed multi-zone system costing several thousand dollars. Whichever you choose, professionally monitored systems also carry a recurring monitoring charge for as long as the service runs. Ask any provider to quote hardware and monitoring separately, in writing.

See the full security system installation cost guide - by material, size and region →

If the number is the problem, here are the ways people pay for it →