30x20 Metal Building Cost: What You’ll Really Pay

A 30x20 metal building gives you 600 square feet of covered space and is one of the most practical sizes for a two-car garage, workshop, lawn equipment storage, or ATV storage. But when buying a structure like this, one of the first questions will always be: “How much does a 30x20 metal building cost?” Our 20'x30'x10' Two Car Garage starts at around $10,150 . This price includes the metal building package and delivery and installaton. Concrete is not included in this shell price. Using this price plus an estimated concrete slab cost of $3,600 to $7,200 , a 30x20 metal building with a concrete slab may cost around $13,750 to $17,350 . The average planning estimate is $15,550 .  Quick Cost Breakdown for a 30x20 Metal Building Cost Item Estimated Cost 30x20 / 20x30 metal building shell from Boss Buildings Starting at around $10,150 Delivery and installation for the metal building Included Estimated concrete slab, 600 sq. ft. at $6-$12 per sq. ft. $3,600 - $7,200 Average estimated concrete slab cost $5,400 Estimated building + concrete slab total $13,750 - $17,350 Average estimated building + concrete slab total $15,550 These numbers are meant to help you plan your budget. Your final quote can change based on your location, roof style, height, doors, windows, certification needs, site conditions, and any custom options you choose. How the Concrete Slab Cost Is Calculated A 30x20 metal building needs a 600-square-foot concrete slab. Using a slab estimate of $6 to $12 per square foot, the concrete cost works out to be: Low estimate: 600 sq. ft. x $6 = $3,600 High estimate: 600 sq. ft. x $12 = $7,200 Average estimate: 600 sq. ft. x $9 = $5,400 That means the slab alone may average around $5,400 before any special site work or upgraded concrete requirements. Your concrete cost may increase if your property needs grading, gravel base, drainage correction, tree removal, thickened edges, wire mesh, rebar, or a thicker slab for heavier use. What Does the 30x20 Metal Building Price Include? For this cost guide, we are using our comparable 20'x30'x10' Two Car Garage as the reference building. A 30x20 and 20x30 layout both give you 600 square feet of usable space, so this building is a helpful starting point for customers comparing 30x20 metal building prices. Our starting price for this building is $10,150 . This building is designed for everyday use. It gives you room for vehicles, tools, lawn equipment, motorcycles, ATVs, workbenches, and household storage. Delivery and installation are included for the metal building, which makes it easier to plan the structure side of the project. Does the Price Include a Concrete Slab? No. The $10,150 starting price is for the metal building package from Boss Buildings. It includes delivery and installation for the building itself, but it does not include concrete slab work. If you want a concrete floor, you should plan that cost separately with a local concrete contractor. Based on $6 to $12 per square foot, a 600-s