Concrete slab guide
Concrete slab DIY vs contractor cost
Compare bagged concrete, ready-mix, and contractor slab costs with volume and site work in mind.
Reviewed · May 9, 2026Start with the calculator
Use the calculator first so the DIY and contractor comparison starts from the same project size and assumptions.
When DIY can make sense
- Small pad
- Easy access
- Simple forms
- No structural or drainage concern
When a contractor can make sense
- Large slab
- Driveway or structural use
- Poor access
- Reinforcement or finishing expectations
How to decide
- DIY is usually limited to small pads where bags, forms, and finishing time are manageable.
- Ready-mix, reinforcement, drainage, driveway use, or tight finish expectations are signs to price a contractor.
- Make sure bids state base prep, thickness, reinforcement, delivery fees, and finish type.
Worked example
12 ft by 10 ft slab at 4 in thick.
Concrete volume
1.7 cu yd
44.0 cu ft with 10% waste
DIY material total
$392–$903
Ready-mix plus forms/base
Contractor total
$776–$1,623
Materials plus labor
Starter shopping list
- Ready-mix concrete 1.7 cu yd
- Forms, stakes, gravel base, reinforcement Project allowance
- Finishing tools and curing supplies As needed
This example is generated from the same calculator logic used on the Concrete slab calculator page.
Cost factors to compare
- Slab size
- Thickness
- Delivery type
- Base prep
- Reinforcement and finish
Contractor quote checklist
- Thickness listed
- Base prep listed
- Reinforcement listed
- Finish type listed
- Delivery and pump fees clear
Common mistakes
- Using bags for too large a slab
- Skipping base prep
- Forgetting forms and reinforcement
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