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Concrete Slab Quote Calculator

In a typical concrete slab quote, pour and finish labor accounts for 40–50% of the total, concrete materials and delivery for 25–32%, and site preparation for 12–16%. Permit fees are usually a flat $75–200 regardless of project size. These ratios shift based on project type, finish, and region — use the calculator below to see a breakdown personalized to your project.

40–50%

Labor

largest line item

25–32%

Materials

concrete + delivery

12–16%

Site Prep

base, forms, grading

×

400 sq ft — 4.9 cu yd

Site Preparation & Grading

~14%

of quoted total

Excavation to required depth, grading for drainage, and compaction of the gravel or crushed stone base.

–Slope: every foot of grade adds excavation and forming complexity
–Existing concrete or asphalt removal (almost always a separate line — confirm)
–Soil type: clay, expansive soil, or rocky ground all add cost
–Site access: jobs requiring a pump truck or restricted equipment carry a surcharge
–Gravel base depth: 4 inches is standard for this project type — confirm it's specified
Red flag: Quote doesn't mention gravel base depth or drainage slope — ask what sub-base prep is included.

Concrete Materials & Delivery

~28%

of quoted total

Ready-mix concrete (typically 3,000–3,500 PSI for this project type), delivery to site, and any admixtures required for local conditions.

–PSI specification: higher strength mix costs more per yard — should be stated explicitly
–Admixtures: air entrainment, retarders, accelerators each add to material cost
–Your pour is within the typical single-truck delivery range
–Ready-mix plant distance: remote sites with longer haul pay fuel surcharges
Red flag: Quote specifies no PSI strength. This is a fundamental spec — a quote without it can't be fairly compared to others.

Reinforcement (Wire Mesh)

~7%

of quoted total

Welded wire mesh rolled out and elevated on chairs to the correct position within the slab.

–Mesh gauge and grid spacing affect material cost
–Mesh must be elevated into the middle third of the slab — not left sitting on the subbase
–Overlapping mesh seams add to material quantity
Red flag: Quote mentions "wire mesh" with no gauge or grid size — ask for the spec.

Pour & Finish Labor

~44%

of quoted total

Crew labor to place and strike off the concrete, float the surface, apply broom texture, and edge the perimeter.

–Crew size: larger slabs must be poured and finished in one continuous operation — more area = more crew = higher labor cost
–Broom finish is the most forgiving and least labor-intensive — standard residential option
–Site access: limited equipment or pump truck requirement adds setup labor
Seasonal: Demand peaks April–September. September–October is typically the best window to negotiate. Winter pours carry a 15–25% surcharge in freeze-thaw states.

Permits & Inspections

~4%

of quoted total

Building permit, plan review fee, and any required inspections before and after the pour.

–Jurisdiction: requirements vary significantly by city and county
–Residential patios often fall below permit thresholds — but confirm with your local building department
–HOA approval: separate from a building permit — confirm who handles this
–Permit timeline: permits can take 1–4 weeks and may delay your start date
Red flag: Quote makes no mention of permit responsibility. Ask: who pulls the permit and who pays for it?

Cleanup & Haul-Off

~3%

of quoted total

Form removal after curing, debris haul-off, and site cleanup.

–Form lumber: confirm the quote includes form removal — some contractors leave it
–Haul distance to disposal site affects this line
–Urban jobs: restricted access or street permits for waste containers add cost
–Demolition debris (if existing concrete was removed): confirm it's included or quoted separately
Red flag: Nothing in the scope mentions form removal or debris disposal — confirm in writing.

What a Complete Concrete Quote Must Include

Before comparing bids, verify every quote covers the same scope. A lump-sum quote that omits these items may look cheaper — until the extras hit.

  • 1Slab thickness (inches) stated explicitly
  • 2Concrete PSI strength specified (e.g., 3,000 PSI, 4,000 PSI)
  • 3Reinforcement type (wire mesh, rebar) and placement spec
  • 4Sub-base prep: gravel type and compacted depth
  • 5Finishing method (broom, stamped, exposed aggregate)
  • 6Permit responsibility: who pulls it and who pays
  • 7Payment schedule: what triggers each payment milestone
  • 8Warranty or workmanship guarantee (if any)

Red Flags in Contractor Quotes

No PSI strength specified

Concrete strength directly affects durability. A contractor who omits this may substitute a cheaper mix.

No mention of reinforcement type or placement

"Reinforced slab" without a spec is meaningless. Ask for bar size, spacing, and how it will be elevated.

Quote valid for 24–48 hours only

This is a pressure tactic. Legitimate contractors give you time to get competing bids — typically 7–14 days.

Lump sum with no scope of work

Impossible to compare against other quotes or verify what's included when disputes arise.

No discussion of permits for structural work

Foundation slabs, large driveways, and garage floors usually require permits. Skipping this conversation is a red flag.

Verbal-only quote

If it's not in writing with a defined scope, it's not a quote — it's a number that can change.

Seasonal Pricing: When to Get Quotes

Concrete contractor demand follows a predictable seasonal cycle. Timing your quote request can meaningfully affect your negotiating position.

PeriodDemandWhat to expect
April – SeptemberPeakContractors are booked. Less room to negotiate on price or timeline.
September – OctoberBest windowReliable weather, end-of-season availability. Best combination of conditions and negotiating leverage.
November – MarchLow / variesHigh availability but cold-weather pour costs offset savings in freeze-thaw states. Mild climates see fewer restrictions.

How Location Affects Your Quote

Labor rates are the primary driver of regional price variation — a patio that costs $5/sq ft in Texas may cost $9/sq ft in California, even with similar materials. Contractor density matters too: rural markets with fewer bidders see less price competition.

See what concrete work typically costs in specific cities on our project cost by city pages, which use DOT bid data adjusted for residential work.

Frequently Asked Questions