How much does a security system actually save on home insurance?

Real discounts for a monitored security system are typically 5% to 15% off your home insurance premium, depending on the carrier and the level of monitoring. The 'up to 20%' figure security salespeople quote is the marketing ceiling, not the typical actual discount.

Which home insurance carriers give the biggest security-system discount?

Discount sizes vary by carrier and state, but among major US carriers, central-station-monitored systems typically qualify for the higher end of each carrier's range. Local-only systems (alarm without monitoring) qualify for a smaller discount or sometimes none at all.

Do I have to keep paying for monitoring to keep the discount?

Yes, in almost every case. The discount is tied to active central-station monitoring. If you cancel monitoring, the discount comes off your next renewal.

What documentation does my insurer need?

An alarm certificate from your monitoring company is the typical document. It lists the type of monitoring (burglar/fire/environmental), the central station, and the certificate expiration date. Many carriers will not apply the discount without this certificate on file.

The Real Insurance Discount for a Home Security System (And Why "Up to 20%" Almost Never Means 20%)

TL;DR

When a security salesperson promises "up to 20% off your home insurance," the realistic discount your carrier will actually apply is closer to 5-15%. The exact number depends on your carrier, your state, and whether your system is centrally monitored vs. local-alarm-only.

This guide explains the wording trick, the typical real numbers by carrier category, and how to verify the actual discount before signing a security contract that you partly justified by the insurance savings.

The free Insurance Savings Calculator walks you through this with your own premium.

The "up to 20%" wording trick

"Up to 20% off your home insurance" is technically true. Some carriers in some states for some homeowners with some systems do reach that ceiling. Almost no actual homeowner does.

The wording is structured the same way "save up to $1,000" furniture-store ads work: the headline number is the maximum theoretical case, not the typical case. Practically, the median discount we see homeowners actually receive for adding a centrally-monitored security system is in the 5% to 12% range.

For a homeowner paying $1,800/yr for home insurance, that's $90-$216/yr saved. Real money — but a long way from the "$360/yr" the "20%" figure implies.

Why the discount exists at all

Insurance carriers offer security-system discounts because the data supports them. A centrally-monitored system reduces:

Burglary loss frequency (the alarm sounds, the monitoring station dispatches, the burglar leaves faster)
Fire loss severity (smoke detection triggers fire-department dispatch sooner)
Water-damage loss severity (environmental monitoring catches leaks earlier)

The actuarial discount the carrier can offer is a function of how much each of these reduces their expected payouts. This is why fire-monitored systems often get a bigger discount than burglary-only systems — fire losses are bigger.

What actually drives the discount size

In rough order of impact:

Monitoring type. Central-station 24/7 monitoring → biggest discount. Local-alarm-only (the alarm makes noise but nobody calls anyone) → small or no discount.
Coverage breadth. Burglary + fire + environmental gets more discount than burglary alone.
Carrier policy. Carriers vary widely. Some cap the security discount at 5%; some go to 15%; very few go to 20%.
State filings. Insurance is regulated state-by-state. The same carrier can offer different discount percentages in different states.
Other discounts. The security discount stacks with smoke-detector, deadbolt, and gated-community discounts at most carriers, but some carriers cap total "protective device" discounts at a single combined number.

The typical real numbers, by category

These are educational ranges, not promises. Always verify with your specific carrier before relying on these for budgeting decisions.

| System type | Typical discount range | Notes | |-------------|----------------------|-------| | No system | 0% | Baseline | | Local-alarm only (no monitoring) | 0% to 3% | Some carriers don't recognize this at all | | Centrally-monitored burglary | 5% to 10% | The most common case | | Centrally-monitored burglary + fire | 8% to 15% | Fire monitoring is the biggest single jump | | Burglary + fire + environmental (water/freeze) | 10% to 18% | The "fully monitored" tier |

If a security salesperson is quoting you 20%+ on the insurance discount, they are quoting the top end of the top tier in the carriers most generous to security systems. That may or may not be your situation.

How to verify the real number before signing

Five-minute verification process:

Pull your most recent home insurance declaration page. Find the "annual premium" number.
Call your insurance carrier (not the security salesperson). Ask: "What is the discount for a centrally-monitored burglary alarm? With fire monitoring? With environmental? Is there a cap on total protective-device discounts?"
Get the answers in writing (email or insurer portal screenshot).
Multiply your annual premium by the verified discount percentage. That is your real annual savings.
Apply that to the security system's total cost. Use the 3-year cost calculator — does the security-system contract still make sense with the realistic discount, or only with the inflated one?

If the security contract only makes financial sense at the inflated discount number, that's a red flag. The security system has to make sense on its security merits first; the insurance discount is a tiebreaker, not the headline benefit.

What to do if the discount didn't materialize

If you signed a security contract partly because of an insurance-discount promise that didn't show up on your renewal:

Get the certificate. Your monitoring company can issue an alarm certificate listing exactly what's monitored. Send it to your insurance carrier.
Re-request the discount in writing. Some carriers require an explicit request after the certificate is on file.
If the actual discount is significantly less than what was promised at signing, keep the documentation. This is one form of "misrepresentation" that supports a contract-breach argument if you later want to exit the security contract early. See the after-signing options system.

What about renters insurance?

The same logic applies, but the discount percentages are typically smaller (5-10%) and the absolute dollar savings are smaller (because renters premiums are smaller). For renters, the security-system insurance discount is rarely the deciding factor.

Free tools that pair with this guide:

Insurance Savings Calculator — discount math with your own premium
3-Year Cost Calculator
Quote Decoder — paste the quote, scan the insurance-discount language

Editorial methodology: securitycompasshq.com/methodology. Educational only — not insurance advice. SecurityCompass HQ does not earn commissions from insurance carriers.