Sprinklers, alarms, and suppression — NFPA-compliant takeoffs.
Pilrs reads fire sprinkler and alarm drawings to count heads, devices, and horns; quantify pipe LF by size; and reconcile hydraulic calculations per NFPA 13 and NFPA 72. Dry, wet, pre-action, and clean-agent suppression all supported.
Fire protection is a regulation-bounded trade where the code-required design drives the entire scope. NFPA 13 governs sprinkler design, NFPA 72 governs alarm design, and local AHJs add overlays that vary by jurisdiction. A "light hazard" office at 225 SF per head with 15 PSI discharge pressure is dramatically different from an "ordinary hazard group 2" warehouse at 130 SF per head with 20 PSI. Misclassify the hazard and you under-price the main pipe sizes by 35-45%.
The takeoff bottleneck is hydraulic verification at takeoff time. Pipe sizing depends on flow, pressure, elevation, and friction loss through fittings — and the only way to verify the bid pipe sizes will pass hydraulic calc is to run the calc. Manual estimators take off pipe LF by what is shown on the plan, then submit to engineering for hydraulic verification, then revise the takeoff if pipe sizes change. That iteration cycle averages 3-5 days and 8-14 hours of estimator time.
Device count failures kill fire alarm bids. NFPA 72 requires smoke detector spacing on 30-ft centers in smooth ceilings, but peaked or sloped ceilings extend spacing with multipliers. Strobe candela depends on room area — a 32-ft wide room needs 110 cd minimum, not the 15 cd standard kit. Miss the candela rating and you fail ADA visual notification at inspection, requiring full re-pull of NAC circuits at $4-8 per LF.
A 60,000 SF warehouse might have light hazard offices (225 SF/head), ordinary hazard 1 in shipping (130 SF/head), and ordinary hazard 2 in records storage (100 SF/head). Each zone has different pipe sizing requirements. Manual estimators apply a single hazard class across the building and either over-engineer the offices or under-pipe the storage areas.
Light hazard maximum 225 SF per head with 15 ft maximum spacing. Ordinary hazard 130 SF per head with 15 ft maximum. Extra hazard 100 SF per head with 12 ft maximum. Obstructions (beams, ducts, lights) require additional heads. Manual takeoffs count heads per plan but rarely verify spacing limits — a head missed in a 16-ft beam pocket fails inspection.
A 4-inch main feeding ordinary hazard 2 needs Schedule 40 if internal pressure exceeds 175 PSI; otherwise Schedule 10 is acceptable. Black steel for wet systems; galvanized for dry. CPVC for residential and light hazard up to 4-inch. Spec drift between schedule and material adds $4-8/LF on every pipe segment.
NFPA 72 6.10 increases smoke detector spacing on sloped ceilings — but only above the high point, with mandatory placement at the high point. Strobes on a sloped ceiling 24 ft high require ceiling-mount candela calculation per Table 18.5.5.5.1. A church or warehouse with high sloped ceilings needs 2-4x the strobe count of a flat-ceiling building of equivalent area.
NFPA 14 governs standpipe systems for buildings over 30 ft. Class I (FD only), Class II (occupant), or Class III (both). Each class drives valve sizing, cabinet count, and FDC assembly cost. Multi-story buildings require pressure-reducing valves on lower floors. Manual takeoffs that omit standpipe scope undercut by $14,000-32,000 per high-rise.
A typical 50,000 SF commercial building has 80-160 addressable points (smokes, heats, pulls, monitor modules). The FACP must be sized for total points plus 25% future expansion. Battery sizing per NFPA 72 Section 10.6 requires 24 hours standby plus 5 minutes alarm — driving battery cabinet selection. Misize the FACP and the system needs replacement, not expansion, at $14,000-28,000 retrofit cost.
The line items that slip between plan sheets — and the dollars that leave with them.
NFPA 13 requires sprinkler pipe hangers per Table 9.1.1.6 (every 12 ft for 4-inch pipe, every 8 ft for 1-inch). Seismic bracing required in zones with Sds > 0.50g — adding $1.40/LF to all 4-inch and larger pipe. Frequently a $4,000-12,000 miss on multi-story buildings.
A 750 GPM electric fire pump with controller, jockey pump, and test header runs $48,000-85,000 installed. Frequently confused with mechanical or electrical scope at bid time, leading to scope gaps.
Spec-required annual fire alarm and sprinkler inspections and 5-year obstruction investigations run $1,800-4,800/year per building — sometimes bid by GC, sometimes left to FP contractor with ambiguity.
Sprinkler riser cores through structural slabs need coordination with concrete contractor; sprinkler hangers in bar joists need coordination with steel detailer. Field-modified hangers and field-cored slabs run $185-340 per location, frequently absorbed.
NFPA 13 (2025 edition) and NFPA 72 (2025 edition) adoption is rolling out in IBC 2024 jurisdictions, introducing new ESFR sprinkler requirements for high-pile storage and tightening fire alarm voice evacuation requirements. Combined with the data center and warehouse construction surge (both sprinkler-intensive at $4-8/SF for FP scope), and the chronic shortage of NICET-certified estimators (32% gap projected through 2027), takeoff speed is the difference between bidding 1 job per week and 3 jobs per week.
Fire protection takeoffs fail because the code-required design drives the entire scope. A plain 8,000 SF office building is light hazard per NFPA 13 — 225 SF per head, 15 PSI discharge pressure. Drop in a 1,200 SF records storage room and that area becomes ordinary hazard group 2 — 130 SF per head, 20 PSI. Estimators working from plan area alone without hazard analysis undersize the branch piping and cannot pass hydraulic calc at plan review.
Alarm takeoffs fail on device spacing. NFPA 72 requires smoke detectors on 30-foot centers in smooth ceilings, but peaked ceilings extend spacing with height multipliers; sloped ceilings add placement rules at the high and low edges. Strobe candela depends on room area — a 32-foot wide room needs 110 cd minimum, not the 15 cd unit in your standard device kit. Mismatch the candela rating and you fail ADA visual notification requirements.
Suppression system selection is the third failure mode. A data center with a dry-pipe sprinkler works if the AHJ allows it, but most modern data center specs call for pre-action with dual interlock — a system that requires both smoke detection and sprinkler head fusion before water flows. Clean-agent systems (FM-200 or Novec 1230) are quoted by the cylinder and the enclosure volume. Pilrs reads the fire protection symbol legend and routes each room to the correct system type.
Pilrs reads fire protection and fire alarm drawings plus the fire protection narrative to produce sprinkler head counts by type (upright, pendent, sidewall), pipe LF by size (1" to 8"), fittings, valves, and hangers per NFPA 13. Alarm devices (smoke, heat, strobe, horn, pull) are counted per NFPA 72 with addressable panel points. Hydraulic calc assumptions are flagged for the PE of record.
Heads counted per plan with type and temperature rating. Coverage verified against hazard class from the fire protection narrative.
Sprinkler piping quantified in LF by diameter (1" through 8") with Schedule 10 or Schedule 40 per spec and black or galvanized per system type.
Grooved and threaded fittings counted per junction. Hangers spaced per NFPA 13 Table 9.1.1. Control, check, and dry-pipe valves identified.
Smokes, heats, horns, strobes, pulls, and monitor modules counted per plan. Candela ratings verified against room dimensions per NFPA 72.
FM-200, Novec 1230, and CO2 cylinders sized by enclosure volume. Pre-action valves, release panels, and detection cross-zoning tracked.
Riser assemblies, backflow preventers, fire pumps, and city connection components quantified from the riser diagram.
From plan upload to verified estimate — purpose-built for fire protection contractors.
Fire sprinkler plans, fire alarm plans, riser diagrams, and fire protection narrative. NFPA hazard class identified per area.
Heads and alarm devices counted. Pipe traced by size. Fittings and hangers applied per NFPA 13 spacing rules.
Hazard classification verified against design density. A fire protection estimator reviews against NFPA and local AHJ requirements.
Heads, pipe LF, fittings, valves, alarm devices, and labor hours by system type. Service entry and pumps priced separately.
Direct answers to the questions fire protection estimators ask most.
Long-form guides with real waste factors, labor units, and bidding traps — written for working estimators.
How to measure, count, and quantify fire protection scope without missing phantom items. Spec-to-drawing cross-checks, waste factors, and the common 2 percent errors that kill bids.
Labor units, burden, markup, and the real 2026 material pricing bands. Where new estimators underbid themselves and what experienced shops carry in contingency.
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