Pricing varies by supplier. Some may give you a box with some basics, a one-time installation fee, and then hit you for monthly monitoring fees to cover their costs over time and make a profit after that.
Most alarm installers will give you a detailed quote that lists the types of sensors, panel, annunciators, pull stations, batteries, monitoring, and estimated labor costs. To be certain you're getting "a good deal", you should get two or three estimates FOR THE SAME SYSTEM, not three separate designs that are difficult to compare.
For example: a 3500sqf restaurant 3 floor, you would need smoke and heat detectors on each level and in any storage areas and in the boiler room, a panel that receives those signals plus connections from your hood extinguisher and any sprinkler system, and three or more horns with strobe lights (if required). It could easily run upwards of $2,000 for all of that, depending upon local labor costs.
Other options include direct wiring or phone circuits to an alarm monitoring center and a subscription service for the monitoring and required annual testing and maintenance.
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