Prefab kit versus custom-built sheds
The first decision is whether you want a prefab kit, a pre-built delivered shed, or a site-built custom structure. Kits from big-box stores run $800 to $4,500 for sizes from 6x8 to 12x16, plus roughly 20 to 40 hours of DIY labor. Pre-built sheds delivered by companies like Tuff Shed, Home Depot, or local Amish builders cost $2,500 to $12,000 installed, depending on size and siding. Custom site-built sheds from a carpenter run $80 to $200 per square foot, which means a 10x12 shed (120 sq ft) lands between $9,600 and $24,000.
Why the spread? A kit uses thinner OSB siding, stapled roofing, and a pine floor. Site-built sheds typically use the same materials as a house — 2x4 framing 16 inches on center, LP SmartSide or cedar siding, architectural shingles, and a treated plywood floor over pressure-treated skids or a poured slab. They last 30 to 50 years versus 10 to 20 for a budget kit.
Sizing: what does 8x8 to 16x20 actually store
An 8x8 (64 sq ft) shed holds a push mower, two bikes, and a handful of lawn tools — fine for a townhouse. A 10x12 (120 sq ft) fits a riding mower, snow blower, and workbench. A 12x16 (192 sq ft) is the sweet spot for most suburban yards and doubles as a workshop. A 16x20 (320 sq ft) is approaching outbuilding territory — big enough for an ATV, lawn tractor, and serious tool storage. Most municipalities allow sheds up to 120 or 200 square feet without a permit, but anything above that typically triggers the same permit process as a house addition.
Foundation options: gravel versus concrete
The cheapest code-compliant foundation is a compacted gravel pad on a leveled site, framed with pressure-treated lumber. Expect $200 to $600 in materials for a pad up to 12x16, plus a day of labor if you hire it out. Gravel pads drain well, handle frost heave, and can be adjusted if settling occurs. The shed sits on pressure-treated 4x4 or 4x6 skids.
A concrete slab runs $5 to $10 per square foot poured and finished, so a 12x16 slab costs $960 to $1,920. Slabs are better for heavy equipment, woodshops, and anywhere you want a clean floor to sweep. Concrete piers are a middle option for sloped lots — $75 to $200 per pier, typically six to nine piers for a mid-sized shed. In frost-prone climates, piers must extend below the frost line (36 to 48 inches in the northern US) to avoid heaving.
Roof style and siding choices
Roof style drives both cost and usable headroom. A standard gable roof with asphalt shingles is the baseline at about $4 to $8 per square foot of roof area. A gambrel (barn-style) roof adds 15 to 25 percent but gives you a full loft for storage. A skillion (single-slope) roof is cheapest but looks industrial. Metal roofing runs 20 to 50 percent more than shingles but lasts 40 to 50 years.
Siding options, cheapest to most expensive: T1-11 plywood ($1.50 to $3 per sq ft), LP SmartSide engineered wood ($3 to $5), vinyl ($3 to $6), fiber cement ($5 to $9), cedar ($7 to $12). T1-11 looks rough after five years unless you stain it every two years. LP SmartSide is the best value for long-term durability on sheds.
Permits, setbacks, and zoning
Permit rules vary wildly by jurisdiction. Common thresholds: sheds under 100 or 120 square feet are permit-exempt; sheds with electrical or plumbing require permits regardless of size; setbacks from property lines run 3 to 10 feet; height limits are usually 10 to 15 feet. HOAs often have stricter rules — color requirements, matching siding to the main house, and pre-approval of design. Build without the right permit and your insurer can deny a future claim, plus you may have to move or tear down the shed at sale time.
Permit fees themselves are modest — $50 to $300 — but the design review, surveys, and inspection scheduling can add weeks. Factor this into your timeline.
Electrical, insulation, and upgrades
Running a single 20-amp circuit from the main panel to a shed with direct-burial cable runs $500 to $1,500 depending on distance and whether you hire an electrician or trench yourself. A full subpanel with multiple circuits for a workshop is $1,500 to $3,500. Insulation and drywall turns a shed into a she-shed or office — budget $3 to $8 per square foot for R-13 batts, drywall, and finish. Windows add $150 to $500 each; a walk-in door with a deadbolt adds $200 to $600.
Regional cost variation
Lumber and labor costs swing shed pricing by 20 to 35 percent across regions. The Pacific Northwest and Northeast are the most expensive; the Southeast and rural Midwest are cheapest. Alaska and Hawaii add 40 to 70 percent due to shipping. Pre-built shed dealers have gotten aggressive on pricing since 2023 — often cheaper than building from a kit yourself once you price the delivery, pad, and your own time.
DIY versus hiring a pro
A kit-built 10x12 shed is a reasonable two-weekend project for someone comfortable with a circular saw and impact driver. You save $2,000 to $5,000 in labor. A custom-framed shed with proper weather sealing, flashing, and a shingle roof is a bigger lift — four to six weekends, and you need to get the roof tight before the first real rain. Hire out the electrical unless you have rough-in experience and can pass inspection.
When to call a pro
Hire a contractor if: your site needs significant grading or drainage work, you’re on a steep slope, you want the shed to match the main house in detail, or you’re building over 200 square feet. A good shed builder delivers in two to four weeks and warranties the work. Ask for references, a written scope, and proof of liability insurance.