Roofing labour cost per square

The labour share of an installed price

Labour is 40 to 60% of what an installed roof costs. On an architectural asphalt job quoted at $475 a square, that is roughly $190 to $285 of labour in every square. The share climbs with the difficulty of the roof and with the price of the crew, and it climbs fastest on materials that are slow to fit — slate and tile sit at the top of the same 40–60% band on a much larger base.

Production rates that set the number

Labour per square is not a price you look up; it is a production rate multiplied by a wage. These are the rates a competent residential crew holds on a normal day.

A four-man crew on a 21-square 6/12 gable therefore strips in about a day and lays in about a day and a half — three to four crew-days all in, which is where the customary “two days on a house” comes from when the weather cooperates.

What moves labour per square

These compound. A 10/12 second-storey roof with a dumpster parked across the street is not 25% dearer than the base — it is closer to half again. That is why the cost calculator carries a single steep-and-complex premium rather than pretending to model each one.

From a wage to a bid rate

A roofer’s national mean wage is $27.95 an hour, with the middle half between $22.24 and $31.44. A bid rate is not that number — it is that number plus payroll burden, insurance, workers’ compensation at roofing’s rate, vehicles, and the days rain takes away. Two to two and a half times the base wage is the usual multiplier before overhead and margin. At 2 squares per man-hour of laying, the labour inside a square is roughly an hour and a half of loaded crew time.

The wage guide has the state-by-state spread, which is the single biggest reason the same roof costs differently in two cities.

Why the cheapest labour line is the risky one

Labour is the only line on a roofing bid that can be cut without the customer seeing it on the truck. The savings come from somewhere: fewer nails per shingle, reused flashing, starter cut from field shingles, no ice-and-water at the eaves, a deck that never got walked. Every one of those is invisible on handover day and expensive in year four.