Estimating, Bidding, and Plan Reading
Takeoff discipline
Estimating starts with a complete plan reading: cover sheet, floor plans, riser diagram, sections, details, specifications, and addenda. Count sprinklers by type and temperature, measure pipe by diameter and material, and list valves, fittings, hangers, and fire department connections. Mark up the plans so another estimator can audit the takeoff. Separate material, labor, equipment, permits, testing, and contingency. Read the scale and verify dimensions; do not scale from a PDF without checking a known dimension. Note ceiling type and obstructions because they change head placement and hanger details.
Labor and pricing
Use labor units by head and by pipe diameter, then adjust for height, occupied spaces, night work, and access. A bid should include overhead and profit, not just direct cost. Contingency belongs in the estimate only for defined risk; it is not a substitute for missing scope. Check the bid form for unit prices, alternates, and allowances. Build the estimate in a spreadsheet with quantities tied to the marked-up drawing.
Worked example
A small project has 120 sprinklers. Material is $45 per head = $5,400; pipe and fittings = $6,000; labor is 1.6 hours per head = 192 hours at $62 = $11,904; equipment = $1,500; permits and testing = $900. Direct cost = $5,400 + $6,000 + $11,904 + $1,500 + $900 = $25,704. Overhead at 8% = $2,056.32. Subtotal = $27,760.32. Profit at 10% = $2,776.03. Bid = $30,536.35, rounded to $30,536.
Traps
Do not count only visible heads and miss ceiling protection, riser trim, and test drains. Do not use the same labor unit for a 20-ft ceiling and an 8-ft ceiling. Do not forget sales tax or permit fees where applicable. Do not let an addendum change the scope without revising the takeoff. Check whether the specification requires a specific listing, finish, or warranty. A low bid that omits testing is not comparable. Include a bid qualification list.