Concrete Slabs in Kirkland, WA
Seattle ConcreteCONTRACTORS
(206) 566-0528
Need a garage, shed, ADU or hot tub slab in Kirkland? Here’s how we size the base and slab, typical prices, and what to send for a quote.
- Base and compaction sized to the load
- Vapor barrier and thickened edges where needed
- Flat or sloped to drain, as the use needs
Get a slab quote in Kirkland
Tell us about the project. We’ll call or email to talk it through.
Concrete Slabs for Kirkland properties
A slab is the simplest thing we pour and the easiest to get wrong. Flatness, thickness, base and edges change with what sits on it: a hot tub, a car, a shed, or a living space. We start with the use and the soil, then size the slab to match.
Original ramblers and split-levels next to new construction and townhomes, especially around Totem Lake and Houghton. We work across Juanita, Finn Hill, Totem Lake, Kingsgate, Rose Hill, Houghton, Lakeview, Moss Bay, Market and Norkirk.
Garage slabs
Thickened edges, reinforcement and a slope toward the door.
Shed and studio pads
Level pads sized for the building.
ADU and cottage slabs
Slab-on-grade foundations poured to plan.
Kirkland conditions that affect your slab
Soil and settling
Glacial soils on the ridges are generally firm, while lower areas near Juanita Bay and creek corridors can be wetter and softer.
Yards and access
Smaller lots near downtown and the lake, larger ones up the hill. Many back yards step down a slope and need walls or steps to be usable.
Rain and drainage
Slopes push water downhill toward patios and foundations. Drains behind walls and along patios matter as much as the concrete itself.
Details that help us price your slab in Kirkland
You don’t need answers to all of these. They’re the questions that shape the design and the price.
Use
Garage, shed, ADU, hot tub or equipment.
Size
Length, width and any plans.
Site
Photos of the area, slope and access.
Existing
An old slab, pavers or lawn to remove.
Permit
Is it part of a permitted building?
Timing
When the building or tub arrives.
Options to talk through
| Slab | Typical use | Keep in mind |
|---|---|---|
| Utility / shed slab | Sheds, bins, equipment | Simple base and broom finish |
| Garage slab (monolithic) | Garages and carports | Thickened edges, rebar grid, vapor barrier |
| Slab-on-grade foundation | ADUs and additions | Built to plans and inspected |
| Hot tub pad | Spas | Flat and reinforced for heavy point loads |
Permits for concrete slabs in Kirkland
Foundations and slabs for additions, garages, ADUs and other buildings are part of the building permit, with inspections of footings and steel before the pour. Kirkland Development Services makes the call for your property, and we’ll tell you what we expect before you commit.
Planning a new slab in Kirkland?
Call to talk it through, or send a few details and photos.
What concrete slabs typically cost in the Seattle area
Ballpark numbers help you plan a budget before anyone visits. Use them as a starting point, not a promise.
| Slab | Typical range |
|---|---|
| Basic utility or shed slab | from about $5 per sq ft |
| Garage slab (monolithic) | from about $7 per sq ft |
| Slab-on-grade with base, vapor barrier and rebar | $6–$14 per sq ft |
Typical market ranges, not a quote from Seattle Concrete Contractors. These are ranges other Seattle-area concrete contractors publish for this work (Seattle-WA-Concrete and Seattle Concrete (seattleconcrete.com) published price guides, checked November 2026). Your price depends on size, access, removal, base work, finish and permits, and on conditions at your Kirkland property. We give a written quote after we understand the job.
Concrete Slabs in Kirkland: quick answers
How thick should a slab be?
It depends on the use: shed pads are thinner than garage floors, and structural slabs follow the plans.
Do I need a permit for a slab?
Slabs for garages, ADUs and enclosed buildings are part of a building permit. Simple pads and patios often aren’t.
Do I need a vapor barrier?
Under anything enclosed, yes. Outdoors, it depends.
Do I need a permit for concrete work in Kirkland?
Kirkland lists retaining walls and rockeries over 4 ft tall as needing a permit, and requires a Public Works permit for driveway replacement or any work in the right-of-way. Exemptions don’t apply in steep slope or other critical areas.
Learn more about concrete slabs
See the full concrete slabs guide, or all concrete services in Kirkland.
More concrete services in Kirkland
Tell us about your project
A few photos and rough measurements are enough to start. If you’re not sure what the job needs, describe the problem and we’ll talk it through.
Call (206) 566-0528 or use the quote form at the top of this page.
Find us on Google Maps
Seattle Concrete Contractors | (206) 566-0528 | Seattle, WA