What does a concrete slab cost for a shop, garage or pad?

Multiply the length by the width to get square feet. That footprint drives how much concrete, steel and finishing labor the job needs, so it sets most of the price. Thickness comes next, because a thicker slab uses more concrete per square foot.

The ground under the slab is the part that changes most from one property to another. A level, well drained spot needs little more than forms and stone. A sloped lot, soft fill or a spot that holds water needs excavation, more compacted base and sometimes drainage before any concrete arrives.

Common sizes give a feel for scale. A 10x10 pad is 100 square feet, a 12x12 is 144, a 20x20 carport or pad is 400, a 24x24 two car garage is 576, and a 30x40 shop is 1,200. Every one of them is priced from the same factors: thickness, steel, base work and access.

A square foot price you find online rarely holds on a real lot, because the base work under the slab is different on every property. Joe walks the site, checks the grade, drainage and access, and puts a firm price in writing at no cost.

• 10x10 pad: 100 sq ft, a shed or AC pad
• 20x20 pad: 400 sq ft, a carport or small garage
• 24x24 slab: 576 sq ft, a two car garage
• 30x40 slab: 1,200 sq ft, a shop or pole barn
• 40x60 slab: 2,400 sq ft, a large shop or barndominium

Thickness follows the load. A patio or walkway pad carries foot traffic. A garage slab carries cars and trucks. A shop floor may carry a lift, a tractor, a skid steer or a loaded trailer, and the posts of a lift put concentrated weight on small areas of the slab.

Shop and garage floors are poured thicker than patios and reinforced with rebar or wire, and the edges are often thickened where walls or a building sit on them. Tell Joe what will sit and drive on the slab so the estimate carries the right thickness and steel.

Access matters. When the mixer can back up to the forms, the crew places concrete straight from the chute. When it cannot, the concrete is pumped or moved by buggy, which adds labor. A slab for a future pole barn or metal building may also need footings, anchor bolts or a specific edge detail from the building supplier, and those should be on the estimate from the start.

Finish is usually simple on a shop or garage floor. A smooth trowel finish is easy to sweep, and a light broom finish gives traction on an exterior pad. Sealing the floor after it cures helps it resist oil, fertilizer and road salt.

Send the size you have in mind, what the slab will carry and a photo of the spot through the request form at /request-estimate, or call the office. Joe walks the site, checks the grade, drainage and access, and puts the price in writing. Morgan's crews handle the excavation, grading and base work themselves, so the whole job is on one estimate.