Concrete Quote Checker: Is Your Contractor's Price Fair?

Enter your slab and the price you were quoted. The checker builds a benchmark for the same slab and scope (materials at your prices plus standard labor for your area) and shows whether the quote is below cost, fair, premium or overpriced, and which part of the bid carries the markup.

Quick answer: a fair quote usually lands between the job's direct cost and about 25% above it. For a 20 × 20 ft, 4-inch slab with forms, vapor barrier, #4 rebar and a broom finish that is about $4,050 to $5,060 at U.S. average prices ($7 to $13 per sq ft for most installed slabs).

Last Updated:
How the benchmark is calculated →

Concrete Slab Cost & Volume Estimator

Precision multi-layer project budgeting: Materials, Sub-Base, Reinforcement, Labor & Equipment

Quick Project Presets

Picking a location sets the ready-mix, excavation and labor rates below to that area's typical level. You can still type your own local prices afterwards. Slab prices by state.

1. Slab Dimensions & Quantity
ft
ft
in
2. Concrete Material Type & Pricing
$
3. Project Scope, Reinforcement & Labor
$ /sq ft
inches
$ /yd³
$ /lin ft
$ /sq ft

Closer spacing uses more steel and raises the rebar cost.

$
$ /sq ft
$

Not charged when bagged concrete is selected.

$
$
$
$ /sq ft
%
%
Live Estimate
Estimated Total Project Budget
$4,253.36
$10.63 / sq. ft.
$114.46 / m²
Based on U.S. national average rates
Order Volume (w/ Waste)
5.43 yd³
Net: 4.94 yd³
Or Bagged Equivalent
245 bags
80-lb pre-mix bags
Total Surface Area
400 sq ft (37.2 m²)
Order volume: 4.15 m³
Estimated Wet Weight
21,267 lbs
Perimeter: 80 ft
Cost Distribution Breakdown
Concrete
Labor
Prep/Base
Rebar
Forms

Enter the total your contractor quoted. We compare it with a benchmark for the same slab and scope you set in the calculator: materials at your entered prices plus labor at the regional standard rate, before any overhead or profit. Make sure the calculator scope (base, rebar, finish, pump, demolition) matches what the bid includes.

$
Optional: enter the bid's line items to see where the markup sits
$
$
$
$

Have two or three quotes? Compare them side by side →

How the Quote Checker Works

The checker prices the slab you describe in the calculator line by line, the same way an estimator would. Concrete, reinforcement, base, forms, vapor barrier, finish, delivery, pump and demolition use the prices in the calculator (change them to your local prices). Labor uses the standard $5.00 per sq ft for placing and finishing, adjusted by the location you pick. That total is the benchmark: what the job costs before the contractor's overhead and profit.

Your quote is then placed in one of five bands:

Quote compared with the benchmarkVerdictWhat to do
Less than the materials aloneBelow material costAsk what is left out (base, rebar, finishing, cleanup) and get the scope in writing.
Up to the benchmarkGreat dealLittle or no margin. Confirm the scope and check references.
Up to 25% above itFair market priceNormal overhead and profit for a residential slab.
Up to about 63% above itPremiumHard access, a pump, a rush date or a minimum charge can explain it. Ask for an itemized bid.
More than thatOverpricedOver 30% above the top of the fair range. Get at least two more quotes.

If you have the bid's line items, open "enter the bid's line items" in the Bid Check tab. The checker compares concrete and reinforcement, labor, site prep and base, and everything else separately and points to the line with the largest markup.

Worked Examples (U.S. Average Prices)

Each example uses the calculator's default scope: 4-inch slab, ready-mix with a delivery fee, forms, vapor barrier, #4 rebar at 18 inches, broom finish and standard labor.

SlabBenchmarkFair rangeQuoteVerdict
12 × 12 ft patio
144 sq ft		 $1,580 $1,580 – $1,970 $1,450
$10.07/sq ft		 Great deal / budget-friendly
20 × 20 ft slab
400 sq ft		 $4,050 $4,050 – $5,060 $4,650
$11.63/sq ft		 Fair market price
24 × 24 ft garage floor
576 sq ft		 $5,740 $5,740 – $7,170 $10,250
$17.80/sq ft		 Overpriced / high markup risk

Set the calculator to your own slab and local prices to get your benchmark; the regional index in the calculator adjusts labor and material rates for your state.

Compare Two or Three Quotes

Quotes for the same slab are rarely for the same work: one includes the gravel base and a vapor barrier, another leaves out rebar, a third adds a pump. Enter each quote's total and tick what it includes. Each one is graded against a benchmark for its own scope, then the items it leaves out are added at a fair price, so you can see which is the best value like for like rather than just the lowest number.

Compare Quotes Side by Side

Prices: U.S. national average. Pick your state in the calculator above to adjust labor and concrete.

Quote 1

Quote 2

Quote 3 (optional)

Enter at least two quote totals and tick what each one includes.

What a Fair Concrete Quote Includes

Two quotes can only be compared if they cover the same work. A complete written quote lists:

  • Size and thickness of the slab, and the concrete strength (PSI) and volume in cubic yards.
  • Site prep: excavation, grading, and the depth of the compacted gravel base.
  • Forms and, for garages and enclosed slabs, a vapor barrier.
  • Reinforcement: rebar size and spacing, or wire mesh, with chairs to hold it at mid-depth.
  • Finish (broom, trowel, exposed aggregate, stamped), control joints and curing.
  • Delivery, short-load and pump charges, plus demolition and haul-off if an old slab is removed.
  • Permits and inspections, cleanup, the payment schedule and the warranty.

Set the same scope in the calculator before you compare. A quote that includes a pump or demolition will rightly be higher than one that does not.

Red Flags in a Concrete Contractor Quote

  • A price below material cost, which usually means part of the work is missing or will be added later.
  • No thickness, PSI or reinforcement written on the quote.
  • A large cash deposit before any work starts, or pressure to sign the same day.
  • No license or insurance details, and no references for similar slabs.
  • "Rebar optional" on a driveway or garage, where vehicle loads need it.
  • A single lump sum with no breakdown when you ask for one.

Concrete Quote Questions

Compare it with the direct cost of the same job: materials at local prices plus standard labor. A fair residential quote usually sits between that direct cost and about 25% above it for the contractor's overhead and profit. For a 20 x 20 ft, 4-inch slab with forms, a vapor barrier, #4 rebar and a broom finish, that is about $4,050 to $5,060 at U.S. average prices.
Most installed residential slabs cost $7 to $13 per square foot. Small slabs cost more per square foot because delivery, forms and setup are spread over less area, and decorative finishes, thicker slabs, a pump or demolition add to it.
Common reasons are hard access that needs a pump or wheelbarrows, a small job that triggers a short-load fee or minimum charge, demolition of an old slab, a thicker slab or stronger mix, a stamped or decorative finish, and a busy season. A quote more than about 30% above the high end of the fair range is worth questioning: ask for an itemized bid and get at least two more quotes.
It can be. If a quote is less than the materials alone would cost, something is usually missing: the gravel base, rebar or mesh, forms, finishing, cleanup, or the permit. Get the scope in writing and check the contractor's license, insurance and references before you pay a deposit.
The slab size and thickness, concrete strength (PSI) and volume, site prep and gravel base depth, forms, vapor barrier if any, reinforcement type and spacing, finish, control joints, curing, delivery or pump charges, demolition and haul-off if needed, permits, cleanup, the payment schedule, and the warranty.

Slab Estimating & Editorial Engineering Team

Construction Cost Estimators & Civil Engineering Analysts
Our team specializes in structural flatwork estimating, concrete mix designs, and civil building codes (ACI 302.1R, ASTM C94). All calculators and cost guides are rigorously validated against live contractor material price sheets, regional aggregate indexes, and real-world project bids.