Site & Foundation · Foundation type
Slab, crawlspace, or daylight basement
Every home needs a solid, frost-proof base, and in the Methow that means footings below the 2-foot frost line and a foundation sealed against radon. Most homes sit on a slab or a crawlspace; on a hillside a daylight basement often makes sense. How each is insulated is set by your envelope package.
All three are compared on the same three things:
Your options
Pick what your home sits on
Relative cost compares the foundation on a typical 2,000 square foot single-story home. Your site often narrows the choice: a flat lot suits a slab or crawlspace, a hillside invites a daylight basement.
Slab on grade
The floor is a concrete slab poured on insulation inside short foundation walls. It's the most affordable foundation, and the slab can be your finished floor, polished or stained, with in-floor heat if you want it.
- Look / Style
- Concrete floor at near-grade level
- Relative Cost
- $
- Best For
- Single-level homes, ADUs, and shops on flat sites; concrete as the finished floor
Why people pick it
- Lowest foundation cost
- Slab can be the finished floor
- Works well with in-floor heat
Trade-offs
- Pipes and wires under the slab are hard to change later
- Floor sits close to the ground outside
Crawlspace
The house sits on 3-foot foundation walls with a framed wood floor above a ventilated crawlspace. Plumbing, wiring, and ducts stay reachable from below, and the floor sits higher off the ground and snow.
- Look / Style
- Wood floor raised above a crawlspace
- Relative Cost
- $$
- Best For
- Homes with lots of plumbing; owners who want easy access below; sloped or wet sites
Why people pick it
- Plumbing and wiring stay reachable for repairs and changes
- Raised floor, drier, and further from snow
- Softer wood floor underfoot
Trade-offs
- Costs more than a slab
- Steps up to every entry
- Floor has to be insulated and sealed carefully
Daylight basement
On a hillside, the lower floor is set into the slope with concrete-filled foam block walls, and the downhill side opens to daylight with windows and doors. You gain finished living space under the same roof.
- Look / Style
- Lower floor set into a hillside, open on the downhill side
- Relative Cost
- $$$$
- Best For
- Hillside lots; owners who want more space without a bigger footprint
Why people pick it
- Extra finished floor area under the same roof
- Walls insulated on both faces as they're built
- Uses a sloped lot instead of fighting it
Trade-offs
- Highest foundation cost: more digging, waterproofing, and drainage
- Needs a hillside lot to make sense
Side by side
| Feature | Slab on grade | Crawlspace | Daylight basement |
|---|---|---|---|
| Look / Style | Concrete floor at near-grade level | Wood floor raised above a crawlspace | Lower floor set into a hillside, open on the downhill side |
| Relative Cost | $ | $$ | $$$$ |
| Best For | Single-level homes, ADUs, and shops on flat sites; concrete as the finished floor | Homes with lots of plumbing; owners who want easy access below; sloped or wet sites | Hillside lots; owners who want more space without a bigger footprint |
Set by your envelope package
How your floor is insulated and sealed
You choose the foundation type. How it's insulated and sealed comes with the envelope package you picked, so the floor matches the walls and roof. Every crawlspace in Okanogan County is ventilated: Washington's radon rules don't allow sealed crawlspaces here.
If you choose a slab
With the Good package
Insulated slab edge
Two-inch foam board insulates the slab edge down to the footing, and a taped plastic sheet under the slab keeps ground moisture and radon out.
Plus: Meets Washington's energy code. Trade-off: Center of the slab isn't insulated (unless it's heated).
With the Better package
Insulated under the whole slab
Foam board runs under the whole slab as well as the edges, with a heavy-duty sealed membrane, so the floor stays warmer and drier.
Plus: Warmer floor wall to wall. Trade-off: More foam and membrane than code requires.
With the Best package
Slab cut off from the cold
Foam under the whole slab plus extra foam inside and outside the foundation wall, so the slab is cut off from the cold ground and the cold concrete wall.
Plus: Warmest, most even floor. Trade-off: Most foam and labor.
If you choose a crawlspace
With the Good package
Insulated floor
Insulation fills the floor framing above a ventilated crawlspace, with a sealed ground cover that keeps moisture and radon down.
Plus: Classic, proven method. Trade-off: Crawlspace stays cold; pipes there must be protected.
With the Better package
Deeper insulation, sealed floor
Deeper floor insulation and a fully sealed subfloor, with a heavy sealed ground cover and no ducts in the crawlspace.
Plus: Warmer floors, fewer drafts. Trade-off: Deeper floor framing.
With the Best package
Deep, closed-in floor
Deep floor joists packed with cellulose and closed in underneath with mineral wool board, sealed to the walls above, over a heavy sealed ground cover.
Plus: Warmest wood floor we build. Trade-off: Most labor; deeper floor framing.
Daylight basement, any package: the foam-block walls come insulated on both faces, and the basement floor is insulated and sealed to match your package's slab.
Every Bedrock home
How we build it
Whatever it sits on, every foundation we build is frost-proof, radon-resistant, and poured by our own crew.
We form and pour it ourselves
Bedrock forms and pours your footings and foundation walls with our own crew, so the people who build the foundation also frame the house on it. Footings go below the 2-foot frost line, and anything beyond standard code tables is designed by an engineer.
One crew from foundation to framing
Footings below frost depth
Square, level walls make framing faster
Radon-resistant, every home
Okanogan County is a high-radon area, so every home we build blocks radon gas from the ground: a gravel layer and sealed membrane under the floor and a vent pipe up through the roof. If a test after move-in shows high radon, a quiet fan can be added to the pipe.
Required by code here, done right
Ready for a fan if you ever need one
Slab prep and pour
Before a slab is poured, the plumbing, radon pipe, and any in-floor heat go in, then insulation and a taped membrane. We pump the concrete into place and finish it ourselves; when you want a show-quality floor, we bring in a concrete finisher or a polishing crew.
Everything under the slab checked before the pour
Pump placement keeps the concrete consistent
Garage and shop slabs
Garage and shop floors are built like the house slab, with stronger air-entrained concrete that stands up to freeze-thaw and road salt, a broom finish for traction, and a slope to the door. They're insulated when the garage will be heated.
Concrete mixed for freeze-thaw and salt
Sloped to drain to the door
FAQ
Common questions
Is a slab or a crawlspace better in the Methow Valley?
Neither is better everywhere. A slab costs less and can be your finished floor, but pipes and wires under it are hard to reach later. A crawlspace raises the floor off the ground and keeps plumbing and wiring accessible, and costs more to build. We help you weigh it against your site, budget, and floor plan.
Do new homes in Okanogan County need radon protection?
Yes. Okanogan County is a high-radon county under Washington's building code, so every new home we build has radon-resistant construction: a gravel layer and sealed membrane under the floor and a vent pipe up through the roof. A fan can be added later if a test shows it's needed.
How deep do foundations need to be in the Methow?
Footings go below the local frost depth of 2 feet so freezing ground can't heave the house. On steep or rocky sites the footing depth and design are set with the excavator and, where needed, an engineer.
Related decisions
Not sure which fits your site?
We walk your land with you early and price the foundation types that make sense for it during pre-construction.