Extinguisher service is the cheapest line in a fire protection budget and the first thing a fire marshal checks — a current tag on every unit. It's also where per-unit pricing hides a few multi-year cycles that surprise building owners. Here's the complete NFPA 10 cost picture as of July 2026.
The service cycles and what they cost
| Service | Frequency | Typical cost per unit |
|---|---|---|
| Visual check (your staff) | Monthly | $0 |
| Professional maintenance + tag, route service | Annually | $5–$15 |
| Professional inspection, one-off visit | Annually | $40–$100 |
| Internal maintenance (teardown) | Every 6 years | $25–$80 |
| Hydrostatic test | Every 12 years | $35–$150 |
| Recharge (after any discharge) | As needed | $20–$60 typical dry chemical |
Route pricing is the number that matters for most buildings: once you're on a service company's regular route, annual maintenance on a building's worth of extinguishers costs less than lunch. Minimum trip charges apply to small counts — if you have three extinguishers, you're paying the trip minimum, not $15.
The annual visit — what the tag certifies
NFPA 10 annual maintenance is more than a sticker: the technician checks pressure, weighs or hefts the unit, examines the hose and nozzle, verifies the pin and tamper seal, checks the bracket and mounting height, and confirms the unit still matches the hazard it protects. The dated tag is your proof of compliance — and the absence of one is the single most common extinguisher violation written by fire marshals.
Monthly quick checks stay in-house and free: gauge in the green, pin seated, seal intact, unit visible and accessible, no obvious damage. Log them; inspectors ask.
The 6-year internal maintenance
Most stored-pressure dry chemical extinguishers — the ABC units on nearly every commercial wall — require internal maintenance every six years: the unit is emptied, torn down, internal parts inspected, components replaced as needed, then recharged and sealed with a verification collar. Typical cost: $25–$80 per unit.
The 12-year hydrostatic test
At twelve years, the cylinder itself must be pressure-tested to verify structural integrity. Typical cost: $35–$150 per unit, and many providers bundle hydro + internal maintenance + recharge at around $50–$60 for common sizes.
The replacement math: a new 5-lb ABC extinguisher retails around $40–$80. When a unit hits its 12-year hydro (or a 6-year teardown on an older unit), replacing it is frequently cheaper than testing it — and you get a fresh cylinder, current UL listing, and a 6/12-year clock reset. Any honest service company will tell you which side of that line each unit falls on; it's a good test of the vendor, too.
Special cases worth knowing
- CO2 extinguishers hydro on a 5-year cycle, not 12.
- Class K kitchen extinguishers — required within 30 feet of commercial cooking appliances — ride the same annual cycle and are usually serviced on the same visit as your hood suppression system.
- How many extinguishers do you need? That's a placement calculation under NFPA 10 based on floor area and hazard level — our free Extinguisher Placement Calculator gives you the count and spacing in under a minute.
Buying it well
Extinguisher service is high-volume, low-ticket work — the leverage is in the route. Bundle it with your alarm testing and sprinkler inspections where possible, confirm the company's license (verification guide), and put the whole cycle on a calendar with the free Compliance Calendar Builder. Then compare extinguisher service companies in your metro.