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Lewiston Concrete
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Slab foundation building in Lewiston ID - planned around your lot and your plumbing

Building on a sloped lot and not sure which slab works? We start with your ground and plumbing, then pour a slab that suits both.

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Get your slab planned before you build

Call (208) 848-5044 or use the form, because settling the slab type and the permit early keeps the rest of your build from waiting on the foundation.

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What goes into building a slab foundation in Lewiston?

Slab foundation building means pouring a concrete slab right on the ground, with no basement or crawl space under it, and at Lewiston Concrete we build them in Lewiston, ID by matching the slab type to your lot before anything gets formed.

Most people who call me are planning a house, an addition or a shop and want the foundation settled before anything else gets drawn. What moves the price and the schedule is mostly the slab type your ground calls for, and a T-shaped slab, which sits on a deeper footing, takes longer to build than a monolithic slab poured in one piece or a frost-protected shallow foundation, and it costs more than the frost-protected kind. The plumbing under the slab, how much digging and base work the soil needs and the pour date the weather allows all play in too, and I'll put your own numbers in a written estimate after I've walked the lot.

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Why Lewiston owners call Lewiston Concrete for slab foundations

  • Same person from estimate to pour

    I've run this business since 2017 and still look at every lot myself, then run the crew when we form, pour and finish. Nothing gets lost between the visit and the pour.

  • Your soil checked before the slab

    Nez Perce County ground runs from rocky, shallow canyon soil to deep, silty windblown loess on the prairie. We check yours before we pick a slab type, because the dig and base change with it.

  • Licensed, insured and upfront about cracks

    We're licensed and insured, and before you sign I'll tell you plainly what concrete can and can't do, hairline cracks included. Your satisfaction, guaranteed, starts with no surprises.

On a slab, the part that matters most is the part you'll never see again once it's poured, so tell us about your lot and I'll come take a look.

How we build a slab foundation

I look at the slope of your lot first, because it narrows which slab type makes sense before anyone sets a form. Then we plan the plumbing that runs under the slab with you before anything is formed. After that we dig out and pack the subgrade, the soil the slab rests on, and build up a compacted base instead of just raking dirt level, because a slab only stays as flat as what's under it. We set forms and rebar, the steel that holds the concrete together, pour early enough to stay out of the midday heat, cut control joints, grooves that give cracks a straight place to go, and keep the slab damp while it cures and gains strength. If a budget gets tight, I'll tell you to save on the finish before the base, because nobody sees the base after day one but the whole building sits on it.

If your design calls for a crawlspace or stem walls instead of a slab on grade, that's our foundation installation work, and the same planning carries over. For a shop or small commercial building that needs paving around it, we also handle concrete parking lot building, so the slab and the lot can be graded together.

  • Monolithic slab

    The footing and the floor go in as one pour, so it's usually the quickest to build. It suits fairly flat lots where nothing about the ground calls for a deeper footing.

  • T-shaped slab

    A footing goes in first and the walls and slab are built on it, and that footing's depth is what limits frost heaving, the ground lifting as it freezes. It's one of the two most common types in cold climates.

  • Frost-protected shallow foundation

    Wings of insulation around the edge protect a shallow footing, and it's the other common cold-climate type. Where frost is already shallow it saves nothing on labor or material, though it may still save on energy later, and deep-rooted plants should stay off the ground above those wings.

What should you look at before planning a slab?

  • A slope across the lot

    If the ground visibly falls away across your building spot, the slab type and the dig change with it. Finding that out late means redrawing plans and forms you've already paid for.

  • Puddles that won't drain

    Water that sits where the house will go usually means the grading or the soil isn't moving it away. Pour before that's sorted, and you're building a damp slab with water working against it.

  • No plumbing on the plans

    If your drawings don't show where drains and water lines run, they aren't ready for a slab, because those pipes go in the ground first. Moving one later means cutting concrete.

  • Cracks in the old slab

    If an old slab you're replacing has cracks that keep widening or a floor that's dropped, the ground under it usually moved. Pouring new concrete on that ground just repeats the problem.

What happens after you call about a slab foundation?

  1. Call and set a site visit

    Call (208) 848-5044 or send the form, and I'll come walk the lot with you. Then you get a written estimate spelling out the prep, the mix and the joint layout.

  2. Sort the permit, then pour

    We check with the office that covers your address and pick a pour date with the weather in mind. On pour day I'm on site running the crew through forming, pouring and finishing.

  3. Cure, inspect and hand over

    I stay with the job through curing and the permit inspections. When every city inspector approves the finished project, you get a certificate or letter of completion.

Slab foundation questions we hear

These are the slab questions Lewiston owners ask me most. If yours isn't here, call or send the form and I'll answer it for your lot.

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How much does a slab foundation cost in Lewiston?

The price comes from your lot, mainly the slab type it calls for, the size of the building, how much digging and base work the soil needs and how much plumbing goes under the slab. I'll walk the lot and put a number in writing for your job, so call (208) 848-5044 or email hi@concretelewiston.com to set that up.

What kind of slab foundation works best on a sloped lot?

A T-shaped slab is usually the better choice on steep or uneven ground, and a frost-protected shallow foundation isn't suited to steeply sloped sites. On a hillside lot in Lewiston, that often narrows the choice to one before we talk about anything else.

How do I choose between a slab and a crawlspace for a new house?

Start with where your heating equipment and plumbing will go, because a crawlspace gives HVAC equipment a space that can be conditioned and lets plumbing go in the usual way. On a slab, the plumbing runs under the concrete, so its layout is part of the foundation plan from the start.

What is the best way to keep water away from a slab foundation?

Start with the ground around it, because building guidance puts moisture control first in proper grading, longer eaves where you can, and gutters and downspouts sized to carry water away from the foundation. Under the slab, that guidance calls for gravel as a capillary break so moisture can't wick up, a properly installed vapor retarder to slow what's left, and drain tile when the soil needs it. Before we form, we check where water runs on your lot so the finished grade sends it away from the house.

Do I need a permit to build a slab foundation in Lewiston, ID?

Yes, if the slab is part of building a structure the code covers, the City of Lewiston issues a building permit for it, and a plumbing permit is required for all residential piping inside and out, new construction included. You can ask the city through its Permit Portal, at cd@cityoflewiston.org or at 208-746-1318, option 1. We work on both sides of the state line, in cities like Clarkston, Moscow and Pullman, so we check with the office that covers your address, tell you what they said, and handle the application and inspections if a permit is needed.

Does a concrete contractor have to be registered in Idaho?

Yes, Idaho's Division of Occupational and Professional Licenses says anyone taking on a construction job over $2000.00 in materials and labor has to register unless they're exempt. State law exempts owners working on their own residential property, but a contractor you hire for a job over that amount has to register, so it's fair to ask.

Get a written estimate for your slab

Send your lot address, how much it slopes and any plumbing you have planned, and we'll reply within one business day. I'll come out for a free on-site estimate, with no pressure to book.

(208) 848-5044