Interior projects · Security
Home security: fire protection, smoke detectors, alarms, and cameras
Security is really four systems: fire protection, smoke and carbon monoxide detection, an alarm, and cameras. Here is what each layer does and where the money should go first.
Home security gets sold as a gadget category, but the risk math is unglamorous. Fire and carbon monoxide harm far more households than burglary, so detection and fire protection deserve the first dollars. Once those basics are right, alarm systems and cameras add real value, mostly as deterrence and evidence.
This guide walks through each layer in order of importance, including the smoke and carbon monoxide certificate Massachusetts requires when a home is sold, a rule worth understanding even if you have no plans to move.
01Securing a Massachusetts home usually means retrofitting an old one
Home security marketing sells gadgets for new construction: clean walls, standard doors, wiring where you expect it. Massachusetts housing is a different animal. Public records show 24.5% of the state's single-family homes were built before 1940, which means a quarter of the housing stock predates modern electrical layouts, modern egress thinking, and in many cases any notion of a hardwired detector. Protecting a house like that is a retrofit discipline. You are working around plaster walls, original doors that may not take modern hardware cleanly, and circuits that were never meant to feed a network of powered devices.
Scale matters as much as age. The median Massachusetts single-family home has 7 rooms, so real coverage is a planning exercise, not a doorbell camera and a good feeling. Seven rooms means multiple approach points, multiple floors in many cases, and detector placement that has to satisfy both the physics of smoke and the geometry of the house. The homes with the most character tend to be the ones that need the most deliberate plan.
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See your address in the app →02Fire protection
Fire protection starts with unglamorous habits and hardware: a fire extinguisher on each floor and in the kitchen, clear egress from every bedroom, and closing bedroom doors at night, which measurably slows fire spread. If you are renovating, add interconnected alarms and fire blocking while walls are open, both are cheap at that stage. Residential fire sprinklers are highly effective but retrofitting them into a finished house is a major plumbing project, which is why they mostly appear in new construction and gut renovations.
03Smoke and carbon monoxide detection
Every level of the home needs smoke detection, with alarms in or near sleeping areas depending on your code, plus carbon monoxide alarms near bedrooms and on habitable levels. Replace units every ten years, and use sealed ten-year battery models where hardwiring is impractical.
In Massachusetts, you cannot close on a home sale without a smoke and carbon monoxide certificate from the local fire department. The placement rules the inspector applies depend on when the home was built. Older homes are held to a simpler standard, while newer homes must meet the code in force when they were built or last renovated. Book the inspection early. Failed detector placement is a common closing-week scramble, and the fix is usually a few correctly placed alarms, not a rewiring project.
04Home security systems
Modern alarm systems come in two flavors: professionally installed and monitored, or self-installed kits with optional monitoring subscriptions. The real difference is response. Professional monitoring calls for help when you cannot, while self-monitoring sends your phone a notification you may not see. Door contacts, glass-break sensors, and a loud siren deliver most of the deterrent value. If your house has an older wired system, it can often be revived with a modern communicator instead of being replaced. The right system is not the one with the most features. It is the one that fits how you live and what you actually want protected. Check with your insurer too, since monitored systems often earn a small premium discount.
05Video surveillance cameras
Cameras deter opportunists and settle disputes: package theft, a contractor question, a dented car in the driveway. Wired cameras with local recording are more dependable than battery units that sleep to save power. Aim cameras at your own doors, driveway, and yard.
A short word on recording and privacy. Filming your own property is generally fine, but pointing a camera into a neighbor's windows or fenced yard invites conflict and, in some places, legal trouble. Audio is regulated more strictly than video in many states, including Massachusetts, where recording a conversation without the consent of everyone involved is illegal. Angle cameras down your own property lines and leave microphones off unless you know your state's rules.
06Locks, lighting, and the basics that still work
Before adding electronics, upgrade the mechanics. A solid door with a deadbolt, a reinforced strike plate fastened with long screws into the framing, and locks on ground-floor windows defeat more break-ins than any gadget. Motion-activated exterior lighting is cheap and effective. Smart locks add convenience, entry codes for the dog walker and a log of who came and went, but they are a convenience layer, not a substitute for a door that can take a kick.
07What to weigh before you buy anything
The instinct is to start with cameras. The better order is to start with what the house is required to have, then what it structurally needs, and only then what you would like to watch on your phone.
- In an older home, interconnected smoke and CO detection comes first. It is the one system that saves lives, and detector requirements often surface at the point of sale, so handling it early is cheaper than handling it under deadline.
- Map coverage room by room before buying a kit. A 7-room house with two floors rarely matches the four-sensor starter box designed around an open-plan apartment.
- Check every exterior door and its frame before adding smart locks. A camera pointed at a door that fails at the strike plate is theater, not security.
- Hardwiring in plaster walls costs real money. Decide early which devices genuinely need wire and which can live on batteries or wireless, and budget the wired ones honestly.
- Think about egress while you are thinking about entry. Older homes can have painted-shut windows and awkward escape paths, and a security plan that only keeps people out is half a plan.
- Monitored service is a recurring cost, not a purchase. Price three years of the subscription against the hardware before committing.
- For resale, a tidy, documented system is a mild plus. A tangle of half-installed devices from three ecosystems reads as a to-do list for the buyer.
DIY alarm kits, battery smoke and carbon monoxide alarms, smart locks, and battery cameras are reasonable weekend projects. Anything hardwired crosses into licensed territory. Interconnected hardwired smoke detectors, wired cameras run through finished walls, and any new circuit need a licensed electrician, and in many states alarm installers must hold a low-voltage systems license. If the project touches a fuel-burning appliance, for example adding carbon monoxide protection alongside a new boiler, the appliance work belongs to a licensed plumber or gasfitter. For the Massachusetts sale certificate, the fire department inspects, and an electrician can correct failed placements quickly.
- Smoke alarms expire. Check the manufacture date on the back, ten years is the limit.
- Detector type matters. Some codes call for photoelectric alarms near kitchens and baths to reduce nuisance alarms.
- Cameras that record audio can violate wiretap laws. Disable microphones unless you know your state's consent rules.
- False alarm fines are municipal. Register your system if your town requires it.
- Selling in Massachusetts? Schedule the smoke and CO inspection weeks before closing, not days.
08What it typically costs
Nationally, the biggest cost swing in home security is the line between wireless and wired. Battery and wireless devices are mostly a hardware bill; anything hardwired in a finished older home carries an electrician's labor, and fishing wire through plaster and old framing takes longer than the same run in new drywall. Monitoring subscriptions are the other quiet driver, since a modest monthly fee outweighs the hardware cost within a few years.
Broad national planning ranges as of 2026, not quotes or offers. Local prices vary widely; get multiple written estimates for your own home.
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Size it to your home →09The short version
Do the unglamorous work first: working detectors on every level, solid doors, decent lighting. Then add the connected layer, sized to the house you actually have rather than the starter kit on the shelf. A security upgrade is not good or bad in the abstract; a full monitored system fits a family settling in for a decade, while a landlord or a near-term seller may only need the fundamentals done properly. Match the system to your plans, not to the ad.
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This guide is educational information, not a quote, an offer, an appraisal, or legal advice. Cost figures are broad national ballparks for planning only; real prices vary widely by region, home and scope, and change over time. Assessed values are the public record's tax-cycle figures, not market prices. Building and permit rules vary by municipality. Confirm project specifics with your local building department and licensed professionals.