Kitchen Island Cost Calculator
Build up an island estimate from the base cabinet price, the countertop area (length × width) at your price per square foot, and any sink or electrical add-ons. Plumbing and wiring in an island is permitted trade work.
Calculator
Formula
top area (sq ft) = top length × top width
total = base cabinet + top area × top price + add-ons
Price the countertop from its length and width, add the base cabinet, and include any sink or electrical work as your own add-on figure.
Worked example
A 3 ft × 2.083 ft island top at $60 per square foot, on a $1,200 base cabinet, with $400 for an added outlet circuit.
top area = 3 × 2.083 = 6.25 sq ft.
countertop = 6.25 × $60 = $375.
total = 1,200 + 375 + 400 = $1,975.
Add a prep sink and the plumbing rough-in climbs — that goes in the add-ons field, and it is permitted work.
Islands add plumbing, wiring and code
An island is really three costs stacked together: the cabinet base, the countertop priced by its own square footage, and whatever utilities you run to it. The calculator keeps them separate so you can see each one. The countertop is figured from the top length times width — an island top is usually deeper than a wall run, so measure it rather than assuming 25 inches.
The utilities are where an island gets expensive and where code comes in. A prep sink means running supply and drain lines under the floor; outlets on an island are required by electrical code in most kitchens and mean new wiring; a cooktop adds gas or a heavy circuit plus ventilation. All of that is licensed, permitted work that an inspector signs off — put your quoted figure for it in the sink & electrical field rather than guessing.
Because the tool stores no prices, it works whether your island is a simple prep block or a full second work zone with a sink, cooktop and seating. Enter your own base-cabinet price, your countertop $/sq ft and your add-on total, and treat the result as a planning estimate you confirm with itemized quotes. Before you commit, check scope, permits and code with your local building department.
Frequently asked questions
How much does a kitchen island cost?
It depends on size and whether you add utilities. The tool sums the base cabinet, the countertop (area × your $/sq ft) and your sink/electrical add-ons. In the example a 6.25 sq ft top plus a $1,200 base and a $400 outlet circuit comes to $1,975.
Why does a sink or outlet raise the cost so much?
Because running plumbing or wiring to an island is permitted trade work: supply and drain lines under the floor, or a new circuit and code-required outlets. It has to be done by a licensed pro and inspected, so enter its full quoted cost in the add-ons field.
What countertop size should I use for an island?
Measure the actual top. Island tops are often deeper than a standard 25-inch counter, especially with a seating overhang, so enter the real length and width in feet.
Do I need a permit for an island?
For the cabinet and countertop alone, usually not. But adding plumbing, gas or electrical almost always requires a permit and inspection — confirm scope and code with your local building department before you start.