How much does a 30′ x 30′ concrete slab cost, My actual slab prices.

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Information about How much does a 30′ x 30′ concrete slab cost, My actual slab prices.

Phil Puccio

On this page I will share with you what it costs to have a 30ft x 30ft concrete slab installed and also what it cost for 30ft x 40ft, 20ft x 30ft and 24ft slabs. x 24′.

My name is Mike Day. I have owned Day’s Concrete Floors, Inc since 1985. My company installs many different sized concrete slabs each year.

These 4 sizes are quite popular and I think it’s important for people to know what they cost.

Disclaimer: Remember, these are my prices for installing concrete slabs for my clients in Maine. Prices can vary significantly depending on where you live and who you hire.

how much does a concrete slab 30 x 30 feet cost

What is the base cost of a 30ft x 30ft concrete slab?

The estimated cost for a 30′ x 30′ x 6″ thick concrete slab like the one pictured above costs $5.50 per square foot or $4950.00

So 30 x 30 = 900 square feet.

900 x $5.50 = $4950.00


I can help you save some money by installing your own concrete slab

click HERE to learn more.


What is included in the record price?

The materials included in the plate price above are:

  • 18 yards of concrete mix at 3000 psi @ 135.00 per yard
  • Wire mesh reinforcement
  • A double row of #4 rebars along the edges
  • Work to shape the panel
  • Work to place the concrete and apply a smooth putty finish
  • Contraction joint sawing work (to control cracks)
  • Install anchor bolts (if you want them)

What is not included in my record prices?

I specialize only in concrete work. I’m not doing the excavation and gravel work. Therefore, the preparation of the base for the concrete slab is not included in my prices.

Can I just have a 4″ thick board instead of 6″?

Sure you can. In Maine, most building codes require that we install 6-inch concrete slabs. If you have other regulations, a 4 inch thick slab with a well compacted gravel base is strong enough for most residential garages.

The only difference in price would be the 2 inches of concrete, which accounts for 5.5 yards for a 30′ x 30′ slab. So you could subtract $750 from $4950.00.

A 4 inch thick 30×30 panel would cost $4200.00

What are some other things that would increase the cost?

The edge of the panel is 12 inches deep or more by 12 – 24 inches wide and then tapers down to 6 inches thick for the rest of the panel.

ADDITIONAL COST FOR THIS: $1.00 – $2.00 PER SQFT.

2. 2″ STYROFOAM UNDER PLATE: Our building codes require 2″ Styrofoam under concrete slabs of 600 square feet and larger. The Styrofoam helps insulate the slab from the cold subsurface, prevents the slab from lifting and cracking in cold climate areas, and is used when radiant heat is built into the plate.

ADDITIONAL COST FOR 2″ STYROFOAM: $1.50 – $2.00 PER SQ. FT. (also includes installing the styrofoam)

Thicker edges and styrofoam are the two things we struggle with the most here in Maine. You may not need to consider these where you live, but thought I’d include them for those who do.

What is the cost of a 30′ x 40′ concrete slab?

Based on the information I gave you above:

30′ x 40′ = 1200 square feet

1200 square feet x $5.50 = $6600.00


What is the cost of a 20′ x 30′ concrete slab?

Based on the information I gave you above:

20′ x 30′ = 600 square feet

600 square feet x $5.50 = $3300.00


What is the cost of a 24″ x 24″ concrete slab?

Based on the information I gave you above:

24′ x 24′ = 576 square feet

576 square feet x $5.50 = $3168.00

Remember that the prices above are for 6 inch thick concrete slabs. If you only need a 4 inch thick slab the prices would be a bit lower since they require less concrete.

How much does a 40′ x 60′ concrete slab cost?


These are the tools you need to install your own concrete slab

Pouring and Finishing the Concrete:

Watch us installing a concrete slab!


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