Exact material quantities with the formula shown, so you can check the math yourself. Concrete, framing, roofing and electrical rough-in.
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You just did one assembly by hand. Send one sheet of the same job and we count every material on it, free, back by 8am. No card, no call.
Send one sheet, freeLength × width × thickness, all in feet, divided by 27. A 4″ slab is 0.333 ft thick. So a 20×30 slab at 4″ is 20 × 30 × 0.333 = 200 cu ft ÷ 27 = 7.4 cubic yards. Add 5 to 10% waste and order 8.
5% on a well-prepared slab over compacted gravel with tight forms. 10% on footings, uneven subgrade, or anywhere the forms might bulge. Ready-mix sells in quarter-yard increments, and short-loading a pour costs far more than the extra yard.
Wall length in inches ÷ on-center spacing, plus one for the end. A 40 ft wall at 16″ OC is 480 ÷ 16 = 30, +1 = 31 studs. Then add 2 per corner and 2 to 3 per opening for kings and jacks, plus headers.
A square is 100 sq ft. Roof area is footprint × pitch factor: 6/12 is 1.118, 8/12 is 1.202, 12/12 is 1.414. Architectural shingles run 3 bundles per square. Add 10% for hips, valleys and starter.
NEC 220.12 sets general lighting load at 3 VA per sq ft for dwellings. A 2,400 sq ft house is 7,200 VA ÷ 120 V = 60 A, so four 15 A general lighting circuits minimum. Then the NEC requires at least two 20 A small-appliance circuits, one 20 A laundry, one 20 A bathroom, plus dedicated circuits for fixed appliances.