Most homeowners who call us about an island expect one number. There isn’t one. The kitchen island cost in Seattle usually lands somewhere between $1,000 and $10,000 installed, and where you fall in that range comes down to one question: are you setting a cabinet box on the floor, or are you running water, power, and gas to the middle of your kitchen?
That second version is a real construction project. The first one is closer to furniture.
Here’s how the pricing actually breaks down, based on 2026 cost data and what we see quoting these jobs around King and Snohomish County. All figures below are estimates — your kitchen, your layout, your final number.
Kitchen island cost at a glance
| Island type | Estimated cost, installed | What you get |
|---|---|---|
| Rolling cart | $100 – $900 | Movable, no hookups, DIY-friendly |
| Prefab stationary | $800 – $2,500 | Ready-made cabinet box, standard sizes, no plumbing or electrical |
| Custom, no hookups | $3,000 – $6,000 | Built to your layout and finishes, storage and seating |
| Custom with sink, dishwasher, or cooktop | $6,000 – $10,000+ | Everything above plus plumbing, electrical, and venting |
Prefab or custom — the fork in the road
A prefab island is a finished cabinet unit you buy and set in place. It’s the cheapest way to add counter space and storage, and if your kitchen has an awkward footprint or you’re not ready to commit, it’s a reasonable move. The catch is fit. Prefab comes in standard sizes, and standard sizes rarely suit the older Seattle kitchens we work in.
Custom means we build the box to your dimensions and finishes. That’s the option if you want a specific overhang for stools, a waterfall end, or an island that lines up with the cabinets you already have. Expect $3,000 to $6,000 for a custom island without hookups, and more once appliances enter the picture.
If you’re weighing a bigger project, our kitchen remodel cost guide for Seattle covers how an island fits into a full renovation budget.
What actually drives the price
The island base is usually only a quarter to a third of the final bill. The rest is countertop, labor, and whatever is hiding underneath.
| Component | Estimated cost installed |
|---|---|
| Cabinets (stock) | $100 – $400 per linear foot |
| Cabinets (semi-custom) | $150 – $700 per linear foot |
| Cabinets (custom) | $500 – $1,200 per linear foot |
| Countertop | $50 – $150 per square foot |
| Waterfall end | $500 – $2,000 per end |
| Sink | $380 – $1,400 |
| Faucet | $120 – $250 |
| Dishwasher | $600 – $1,700 |
| Garbage disposal | $200 – $500 |
| Cooktop | $500 – $1,600 |
| Island range hood | $600 – $2,100 |
| Pendant lighting | $100 – $300 per light |
Countertop is where budgets move fastest. A typical island surface runs about 22 square feet, which puts quartz at roughly $1,100 to $4,400 and laminate closer to $450 to $1,750. We cover material-by-material pricing in our countertop replacement cost guide.
Adding a sink or dishwasher
This is the decision that doubles a budget, and it’s worth being honest with yourself about whether you’ll use it.
Running new supply and drain lines to the middle of the room means opening the floor. On a slab, that’s saw-cutting concrete. On a raised foundation — which describes most of Ballard, Wallingford, and West Seattle — we’re working from the crawlspace, which is easier but still real labor. Plan on $450 to $1,800 for the plumbing rough-in alone, plus the fixture costs above.
One thing we tell people: a prep sink in an island is genuinely useful in a big kitchen with two cooks. In a 10×12 kitchen, it usually just eats the counter space you built the island to get.
Electrical is not optional
This surprises people. Under the National Electrical Code, any island larger than 24 by 12 inches needs at least one receptacle, and islands over 9 square feet typically need two or more. That’s not a preference — it’s code, and it will come up at inspection.
Budget $150 to $350 per GFCI outlet and $7 to $10 per linear foot for the wiring run. If the island gets a cooktop, dishwasher, or disposal, you’re likely adding a dedicated circuit, and Washington’s 2023 NEC adoption requires AFCI protection on new kitchen circuits.
Electricians in our market generally run $50 to $140 per hour.
Do you need a permit in Seattle?
Usually not for the island itself. Setting a cabinet box and countertop is cosmetic work.
You do need permits once you touch systems:
- Electrical permit — required when new circuits are added or wiring is run. Like-for-like device swaps at the same location don’t trigger one, but an island almost always means new circuits. SDCI issues these.
- Plumbing permit — required when supply or drain lines are extended or relocated for a sink or dishwasher.
- Mechanical permit — may apply to a new vent duct for an island hood.
Permit costs vary widely; published ranges run anywhere from $50 to well over $500 depending on scope. SDCI also offers a free 20-minute coaching session if your scope is borderline — worth using before you assume.
For a fuller picture, see our guide to kitchen remodel permits in King County.
What we run into in older Seattle homes
A few things come up often enough to plan for:
Floors that aren’t level. Homes from the 1920s through the 1950s have settled. An island has to sit plumb and level even when the floor isn’t, which means shimming and scribing. It’s not a big cost, but it’s not free either.
Undersized panels. Plenty of Seattle houses still run 100-amp service. Add a cooktop and dishwasher circuit to an island and you may find there’s no room left in the panel. Worth checking before you design around appliances.
Clearance. You want 36 to 42 inches of walkway around an island. In the compact kitchens common in Green Lake and Phinney Ridge, that math often rules out an island entirely — or points toward a peninsula instead. We’d rather tell you that at the estimate than after demo.
If you’re still working out whether an island suits your layout, our post on designing a U-shaped kitchen with an island walks through the space requirements.
Is it worth the money?
For resale, a well-sized island returns roughly 60% to 80% of its cost, and it’s consistently near the top of what buyers ask about in a kitchen. A custom island returns more than a prefab one.
But the honest answer is that an island is worth it when it makes the kitchen work better. An island crammed into a room that can’t hold it hurts the space and the appraisal. One that’s sized right becomes the spot everyone stands.
If your cabinets are in good shape and it’s really the layout you want to change, cabinet refacing paired with a new island is often a smarter spend than a full gut.
Frequently asked questions
How much does it cost to install a kitchen island?
Installation alone typically runs $800 to $2,500 for a prefab unit and $3,000 to $6,000 for a custom build. Add plumbing or electrical and $6,000 to $10,000 is a realistic range. These are estimates — a walkthrough gets you a real number.
Is it cheaper to build an island or buy one?
Buying prefab is almost always cheaper up front. Building custom costs more but fits your actual kitchen, which matters more than most people expect in older homes with non-standard dimensions.
How big should a kitchen island be?
The average is about 80 by 40 inches. Keep it at least 24 inches deep, 36 inches tall for prep or 42 inches for seating, and leave 36 to 42 inches of clearance on all sides.
How long does it take to install?
A prefab island is often a one-day job. A custom island without hookups usually takes three to five days including countertop templating and fabrication. Add plumbing, electrical, and inspections and you’re looking at two to three weeks, mostly spent waiting on the countertop and the inspector.
Can I add an island to a small kitchen?
Sometimes, but check clearances first. If you can’t hold 36 inches of walkway on every side, a peninsula or a rolling cart will serve you better than a fixed island.
Get a real number for your kitchen
Cost guides give you a range. A walkthrough gives you a price. We’ll look at your kitchen, your panel, and your floor, and tell you straight what an island will take — including whether we think it’s the right call for your space.
Call 206-851-4233 or get in touch here to set up an estimate. We work throughout Seattle, Bellevue, Renton, and the surrounding King and Snohomish County areas.
