Fire alarm estimating: devices, pathway, programming, test.

Scope first: who designs, who supplies, who programs

Read the fire alarm spec (usually 28 31 00 or 28 46 00, depending on the edition of MasterFormat the project uses) and the drawing notes before counting. The answers change the estimate more than any device count:

• Design-build or engineered design? On design-build work you're responsible for the layout, shop drawings, battery and voltage drop calculations and the permit submittal, usually prepared by a NICET-certified designer. On an engineered design you install to the drawings, but you still submit shop drawings.
• System type. Addressable or conventional, with or without emergency voice/alarm communications (EVACS). Voice systems add amplifiers, speakers and stricter pathway survivability.
• Supply model. Many electrical contractors buy the panel and devices from a fire alarm vendor who also provides programming, technician support and testing. Get that quote early and read its exclusions.
• Interfaces. Monitoring, elevator recall, HVAC shutdown, smoke control, door release, sprinkler supervision, kitchen hood suppression and generator status.
• Existing building? Tie-ins, phasing, temporary systems and fire watch during cutover.

Device takeoff by type and variant

Count devices from the FA plans by type, matching the legend (often based on NFPA 170 symbols). Keep model variants as separate line items:

• Initiating: manual pull stations, smoke detectors, heat detectors (fixed or rate-of-rise), duct detectors, beam detectors, aspirating systems.
• Notification: horns, strobes and horn/strobes by candela rating and wall or ceiling mount; speakers and speaker/strobes by tap setting; outdoor and weatherproof variants.
• Modules: monitor modules (waterflow and tamper switches, kitchen hood, generator) and control or relay modules (fans, dampers, door holders, elevator recall).
• Equipment: FACP, annunciators, NAC power extenders, amplifiers, batteries and cabinets, communicators, remote test switches for duct detectors.

Then go looking for devices on other disciplines' sheets: duct detectors and smoke dampers on mechanical sheets (often furnished by FA and installed by mechanical), flow and tamper switches on fire protection, door holders and access control release on hardware schedules, elevator interfaces on vertical transportation sheets.

Wire and pathway

Estimate circuits by type: signaling line circuits (SLC), notification appliance circuits (NAC), speaker circuits, 24 VDC power and network or riser cabling.

wire (ft) ≈ devices × average run per device × (1 + slack and waste)
             checked against plan distances, ceiling heights and riser lengths
labor hrs  = Σ devices × hrs/device + wire ft × hrs/ft + equipment and termination hrs

Pathway rules can swing labor more than device count:

• Conduit everywhere vs. cable in accessible ceilings. Read the spec and local amendments; some jurisdictions require raceway.
• Survivability. NFPA 72 requires higher pathway survivability for some voice systems. Level 2 generally means 2-hour fire-rated circuit integrity cable, a 2-hour rated cable system, or a 2-hour rated enclosure or protected area. Level 3 adds full sprinkler protection. Survivable cable costs far more per foot than standard fire alarm cable and is slower to install.
• Class A or Class X circuits need return paths, which roughly doubles some runs.

Power: NAC extenders and batteries

Notification load drives power supplies. Large strobe counts at high candela settings need more NAC power extenders, and each one needs a location, a 120V circuit and batteries.

NFPA 72 requires secondary power for a typical system to run 24 hours in standby followed by 5 minutes in alarm. For EVACS it's 24 hours standby followed by 15 minutes of alarm at maximum connected load. Battery calculations size the batteries. Make sure your bid says who prepares them, and price the batteries from the calculation rather than a guess.

Labor: install, program, test, retest

Device installation labor uses your labor units by device type and mounting condition (open ceiling, hard lid, high ceiling with a lift). Then add the items that are easy to underprice:

• Panel and power supply installation and terminations.
• Programming, often by the vendor. Get the hours in the quote.
• Pre-testing every device before the acceptance test.
• Acceptance testing with the AHJ, which can take several days with a technician and an electrician on each floor.
• Retest after AHJ comments. Assume at least one partial retest on complex jobs.
• Documentation: record drawings, record of completion, battery and voltage drop calculations, sequence of operations matrix.

Example: an interface count

A building with two elevators, four air handlers and a sprinkler riser per floor on three floors might need:

Illustrative. Count each interface from the sequence of operations matrix and riser, not from memory, and confirm who provides the device on the other side of each interface.

Scope checklist

• Shop drawings, calculations and permit submittal: included?
• Monitoring service and communicator lines: who provides?
• Elevator recall, HVAC and smoke control: wiring to equipment, and who makes the final connection?
• Two-way radio enhancement (ERCES/BDA) if the fire code requires it: in your scope or separate?
• Existing system tie-ins, phasing in occupied buildings, fire watch during cutover.
• Spare devices, tools and owner training required by the spec.

Common fire alarm estimating mistakes

• Counting notification devices without checking candela or speaker tap settings, which change the model and the power load.
• Missing monitor and control modules for every switch, damper, fan and door interface.
• Underestimating NAC power extenders and batteries on large notification layouts.
• Pricing standard cable where survivable cable or 2-hour pathway is required.
• Pricing installation but not pre-test, acceptance test and retest.
• Assuming cable in accessible ceilings where the spec or local amendments require conduit.

Fire alarm estimator career notes

Fire alarm estimators often come from installation, design or technician roles. NICET certification in Fire Alarm Systems (Levels I to IV) is common in the field and is often required for designers. Some jurisdictions require NICET certification for plan submittals. Pay varies by region and employer.

Where RenderDraw fits

RenderDraw's AI takeoff proposes fire alarm device counts by type against the sheet legend, links every count to its sheet and location, and puts uncertain symbols in a review queue. You still decide the variants, pathway, power and testing assumptions.