Concrete slab: DIY or hire a contractor?
Poured concrete pad with forms, gravel base, and rebar. On a common-size concrete slab, materials estimate to about $616, while a contractor doing the same scope estimates to $1,545–$2,072 including labor at roughly $47/hr. That is an estimated $1,140 (65%) you keep by building it yourself — before you price your own time. These are estimates only, never a quote.
$616
Estimated materials only
$1,545–$2,072
Estimated materials + labor at $47/hr
Estimates only — never a quote. Estimated DIY savings: $1,140 (65%)
| Factor | DIY | Contractor |
|---|---|---|
| Estimated cash cost | $616 in materials | $1,545–$2,072 installed |
| Labor | Your weekends — no labor line item | Billed at about $47/hr regional rate |
| Tools | You buy or rent; a first build often adds tool cost | Included in the bid |
| Permits & inspections | You pull the permit and meet the inspector | Usually handled by the contractor, cost passed through |
| Material waste | Higher on a first build — order the waste factor our calculator adds | Lower; waste is priced into the bid either way |
| Warranty & rework | You own any rework | Workmanship warranty, varies by contractor |
| Timeline | Multiple weekends, weather dependent | Typically a few working days once scheduled |
The honest verdict
If you own basic tools and can give the project a couple of weekends, DIY keeps an estimated $1,140 in your pocket. If the concrete slab is structural, permit-heavy, or you need it finished on a deadline, the contractor premium usually buys back the risk. Either way, run the numbers for your exact dimensions first — then you are negotiating a bid instead of guessing at one.
Price your own concrete slab first
Enter your dimensions and get the material takeoff, cut list and cost estimate — then you can read any contractor bid line by line.
Common questions
- Is it cheaper to build a concrete slab yourself?
- Almost always on cash cost: an estimated $616 in materials versus $1,545–$2,072 installed. The gap is labor at about $47/hr. Estimates only — use the free calculator for your dimensions.
- How much do contractors charge for a concrete slab?
- Our model estimates materials plus labor at the regional rate (national reference: $55/hr), which lands at $1,545–$2,072 for a common-size concrete slab. Local bids vary with access, site prep, and season.
- How do I compare contractor bids for a concrete slab?
- Generate the material takeoff first, then check each bid's material quantities against it. Our bid comparison tool flags a bid that is high on labor or light on materials so you can ask a specific question instead of haggling blind.
- What should I never DIY on a concrete slab?
- Anything carrying load you have not verified, plus gas, primary electrical, and work your local code requires a licensed trade to perform. Our span checks flag structural spans that fall outside common prescriptive limits — if that fires, get a pro or an engineer.