Building a workshop costs $15,000 to $35,000, averaging $25,000 on HomeAdvisor’s figures, with Angi publishing the same range and average (May and June 2026)23. HomeGuide prices the structure per square foot: $20 to $50 for a prefab model against $50 to $150 for a custom build, putting a prefab 30×30-foot shop at $18,000 to $45,000 (January 2026)1. Angi and HomeAdvisor are corporate siblings, and matching figures alone don’t establish independent corroboration — their pages match on most rows below, with HomeGuide providing the separate comparison. All figures are the latest published data from each source.
Cost by size
HomeGuide’s size table splits prefab from custom totals1:
| Size | Square feet | Prefab total | Custom total |
|---|---|---|---|
| 10’x20′ | 200 | $4,000 – $10,000 | $10,000 – $30,000 |
| 16’x16′ | 256 | $5,100 – $12,800 | $12,800 – $38,400 |
| 20’x20′ | 400 | $8,000 – $20,000 | $20,000 – $60,000 |
| 20’x30′ | 600 | $12,000 – $30,000 | $30,000 – $90,000 |
| 24’x24′ | 576 | $11,500 – $28,800 | $28,800 – $86,400 |
| 30’x30′ | 900 | $18,000 – $45,000 | $45,000 – $135,000 |
| 30’x40′ | 1,200 | $24,000 – $60,000 | $60,000 – $180,000 |
| 30’x50′ | 1,500 | $30,000 – $75,000 | $75,000 – $225,000 |
| 40’x40′ | 1,600 | $32,000 – $80,000 | $80,000 – $240,000 |
The siblings publish smaller tier tables: Angi puts 192 square feet at $6,000 to $12,000, 600 at $15,000 to $35,000, 1,200 at $30,000 to $65,000, and 2,400 at $50,000 to $120,000, while HomeAdvisor groups everything over 1,000 square feet at $30,000 to $120,00023. Their 600-square-foot row matches HomeGuide’s custom column low end but not its prefab column — the sibling tables don’t state whether their rows are prefab or custom, so the tables aren’t directly comparable.
Prefab vs custom
All three sources put prefab workshops at $20 to $50 per square foot. On custom builds the ceiling differs: the siblings publish $100 to $150 per square foot, HomeGuide $50 to $150 — ranges as published123. HomeGuide’s split of where the money goes: prefab materials $10 to $30 per square foot with $10 to $20 for assembly labor, against custom materials at $20 to $50 and labor at $30 to $1001.
Labor and professional fees
Labor accounts for 30% to 50% of the total on both sibling pages, with hourly rates of $50 to $15023. Their identical per-project pro table23:
| Professional | Cost per project |
|---|---|
| General contractor | $4,000 – $8,000 |
| Electrician | $4,000 – $6,000 |
| Concrete / foundation specialist | $2,500 – $10,000 |
| Plumber | $1,000 – $5,000 |
| HVAC technician | $2,000 – $7,000 |
| Insulation installer | $800 – $4,000 |
| Carpenter | $1,000 – $8,000 |
Site prep, foundation, and finishing
HomeGuide’s itemized table for a 200- to 600-square-foot workshop built 50 to 150 feet from the nearest power source, selected rows1:
| Item | Average rate | Typical total (200–600 SF) |
|---|---|---|
| Land leveling or grading | $0.40 – $2.00 per SF | $100 – $1,200 |
| Concrete slab foundation | $5.40 – $8.20 per SF | $1,100 – $4,900 |
| Metal roof | $5 – $16 per SF | $1,000 – $9,600 |
| Siding | $3 – $13 per SF | $600 – $7,800 |
| Framing | $11 – $30 per SF | $2,200 – $18,000 |
| Insulation | $1 – $5 per SF | $200 – $3,000 |
| Drywall | $2 – $4 per SF | $400 – $2,400 |
| Running power | $10 – $25 per LF | $500 – $3,800 |
| Electrical wiring | $4 – $9 per SF | $800 – $5,400 |
| HVAC | $3 – $6 per SF | $2,000 – $5,000 |
The siblings match each other on site-work figures: grading $500 to $4,000, tree removal $200 to $2,000 per tree, and old-structure demolition $500 to $3,000 (Angi only)23. Angi also publishes a regional model — West Coast $35,000 to $70,000, Northeast $30,000 to $60,000, Midwest $20,000 to $45,000, South $18,000 to $40,000 — its figures, attributed2.
Permits
Permit rules are set locally — confirm with your building department before starting. Published estimates: $200 to $2,000 on both sibling pages, against $500 to $2,000 (framed as 0.5% to 2% of total project cost) on HomeGuide123.
DIY vs hiring a pro
Angi estimates DIY saves 30% to 50% of the total project cost by eliminating labor — materials cost the same either way — and puts a basic prefab kit assembly at two to seven days for two to three people2. HomeGuide calls a DIY-installed prefab metal kit the cheapest route1. All three warn the work spans carpentry, concrete, and code-level electrical; HomeAdvisor notes many DIYers still hire out the foundation and wiring3.
Related cost guides
See garage cost for a vehicle-first structure, shed cost for smaller storage, and pole barn cost for the post-frame route to a big shop.
Sources
- HomeGuide, Cost to Build a Shop, Outbuilding, or Workshop (2026), updated January 21, 2026
- Angi, How Much Does It Cost to Build a Workshop?, updated May 3, 2026
- HomeAdvisor, How Much Does It Cost To Build A Workshop?, updated June 19, 2026