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The number a homeowner wants is a price per finished square foot. That number is not a takeoff. A 40 sq ft galley with a drop-in sink is not the same job as a 28 sq ft island with two waterfall ends. The footage is smaller on the island. The slabs are not.
Open the free bid calculatorA typical quartz slab is about 46 usable square feet. Layout waste — corners, seams, and the leftover after you pull an L — turns that into fewer finished feet than the homeowner measured. Flooring install prices waste and tear-out of planks. Cabinet refinishing prices doors and drawers. Stone fabrication prices whole slabs plus every polished hole. Quoting both from a published per-square-foot number is how the second slab eats the field margin.
Each waterfall end is typically 36 inches high by about 25.5 inches deep — a little over six square feet that never appears in the island-top measurement — plus the hours to miter, polish, and set it. On the sample rates a 28 sq ft island with two waterfall ends needs two slabs and prices about $4,597 ($164 per finished square foot). The same shop’s 40 sq ft galley with a drop-in and an eased edge fits one slab at about $2,383 ($60 per finished square foot). Matching the galley’s per-square-foot number on the island is how that job becomes a loss.
A drop-in sink is a cut. An undermount is a cut plus a polished hole. A cooktop is another hole. Ogee, bullnose, and mitered laminated edges are lineal-foot labor on the finished perimeter. A default 55 sq ft L-kitchen with an undermount, a cooktop, 18 feet of 4-inch splash, and ogee edges prices about $5,119 on the sample rates ($93 per finished square foot, 24.9 crew-hours, two slabs, walk-away $3,839). Edges and the splash take more hours than the field cut. Treating that as a blended “add 20%” is how the L-kitchen special that looked fine turns into a loss after the first seam.
A $38/h fabricator loaded at 30% payroll burden is $49.40. Margin is a share of the price you send, not a markup on cost. The walk-away price is total cost — below that the job makes nothing before you take a dollar home. Replace every rate with your invoices before you send either number.
This is not a stone specification, a color or lot match, a seam or lead-time warranty, a permit, or a recommended market price. It is arithmetic on the numbers you type. Slab yield, sink model, and whether the waterfall is mitered or laminated are yours to confirm.
Charge from finished square footage, layout waste into whole slabs, sink and cooktop cutouts, edge profile, backsplash, waterfall ends, loaded labor, overhead, and a margin that is a share of price. A default 55 sq ft L-kitchen with an undermount, a cooktop, and ogee edges prices around $5,119 on the sample rates in this calculator — about $93 per finished square foot.
Homeowners measure finished tops. Slabs, polished holes, mitered edges, and waterfall ends do not scale with that footage. Matching a cheaper per-square-foot quote written for a straight galley is how a waterfall island becomes a two-slab loss.
Treat each waterfall as extra stone — typically 36 inches high by about 25.5 inches deep, plus layout waste — not a blended add-on to the island top. On the sample rates a 28 sq ft island with two waterfall ends needs two 46 sq ft slabs and prices around $4,597 ($164 per finished square foot), while a larger 40 sq ft galley with no splash fits one slab at about $2,383.