How Long Does It Take to Build a Metal Building Kit? (Timeline by Size)

It’s never the steel that keeps people up at night.

It’s not knowing when the project actually ends.

Permits stall. Weather shifts. A missing bolt shows up on day three and suddenly your “two-week build” is a two-month build.

If you already know your size, here’s exactly what to expect. Not sure yet? See our size guide first  to figure out what fits your land and your budget.

Quick Answer: Erection alone , the actual steel-up part , usually takes 1 to 6 weeks, depending on building size and crew size. But the full project, including permits, foundation cure time, delivery, and finishing, typically runs 6 to 16 weeks start to finish. Metal Pro Buildings gives customers a real, itemized timeline at the quote stage, not a rough guess.

Quick-Reference: Metal Building Timeline by Size

Every building size comes with its own realistic window. Here’s how they compare.

Full project timeline includes permitting and foundation cure time , not just the days spent putting up steel. That’s where most of the “surprise” weeks actually come from, and it’s what the next section breaks down.

What’s Actually Included in a Metal Building Timeline

A “build timeline” isn’t just the days a crew spends bolting steel together. It’s every step before that, too.

Here’s the full sequence, in order:

1. Design and engineering approval : your kit gets finalized and stamped for your location
2. Permitting : your local building department reviews and approves the project
3. Site prep and foundation : grading, forms, and the concrete pour itself
4. Cure time : concrete needs time to harden before it can bear weight
5. Kit delivery : your steel arrives on a truck, ready to assemble
6. Erection : the actual steel-up phase most people picture
7. Finishing : doors, windows, trim, insulation, and any final touches

Here’s the part that catches people off guard: most delays happen before the steel ever arrives.

A permit office backlog can add three or four weeks before a single beam goes up. Call your local permit office before you order , it’s the same advice we give in our sizes guide, and it matters just as much here.

Metal Pro Buildings maps out every one of these phases at the quote stage. That way, you’re not finding out about a gap halfway through your project.

Timeline by Size: Erection + Full Project

20×20 – Garages & Basic Storage

A 20×20 is the fastest build on this list. A professional crew can erect it in 2 to 4 days.

DIY builders should plan for 1 to 2 weeks, working evenings and weekends.

You’ll need a crew of 2–3 people, even for a small kit like this. Two hands aren’t enough to safely lift and align steel panels.

Full project timeline, including permits and foundation cure, usually lands around 6 to 8 weeks.

This size is popular for a reason: it’s often small enough to skip a full engineering review in some counties, which shaves real time off the front end. Confirm that with your permit office first , don’t assume.

24×30 – 2-Car Garages

A 24×30 garage typically goes up in 3 to 5 days with a professional crew.

DIY timelines stretch to 2 to 3 weeks, mostly because panel alignment gets trickier as the building grows.

• Plan for a crew of 3–4 people minimum.
• Full project timeline runs 6 to 9 weeks start to finish.

If you’re racing to get a second vehicle or workshop space under roof before winter, this is a manageable size to hit that deadline without cutting corners.

30×40 – Workshops & Small Barns

• Erection time jumps to 1 to 2 weeks with a professional crew at this size.
• DIY builders should budget 3 to 4 weeks, and realistically, a rental lift or scaffolding becomes necessary.
• A crew of 4–5 people is the sweet spot here.
• Full project timeline sits around 8 to 10 weeks.

This is a common size for people setting up a workshop before a specific season ,woodworking before winter, or a barn before livestock arrive. Order early enough that a permit delay doesn’t push you past that date.

40×60 – Large Shops & Small Commercial

• Professional crews need 2 to 3 weeks to erect a building this size.
• DIY is possible but demanding , 5 to 7 weeks, and most first-time builders underestimate it.

You’ll want a crew of 5–6 people, plus equipment like a boom lift. Full project timeline runs 10 to 12 weeks.

If this building is meant to open as a small business or commercial shop, that 10–12 week window needs to be part of your business timeline from day one , not an afterthought.

60×80 – Warehouses & Agricultural

At this size, professional erection takes 3 to 4 weeks.

• DIY isn’t recommended here. The scale, height, and equipment needs push it well outside a typical weekend-warrior project.
• A crew of 6–8 people, with cranes and lifts, is standard.
• Full project timeline lands around 12 to 14 weeks.

For agricultural buildings especially, timing matters , you’re often working backward from a harvest season or a herd’s arrival. Build in buffer time for weather delays.

60×100+ – Large Commercial/Industrial

The largest standard builds take 4 to 6 weeks to erect with an experienced crew.

• DIY is not a realistic option at this scale.
• Crews of 8 or more are typical, often with specialized equipment and multiple work zones running at once.
• Full project timeline runs 14 to 16 weeks, sometimes longer with complex permitting.

If this building supports a business opening or an operations launch date, treat the full 14–16 weeks as your floor, not your target. Padding this timeline protects your launch date more than anything else on this list.

What Speeds Up (or Slows Down) Your Timeline

Not every project moves at the same pace, even at the same size. Here’s what actually shifts the schedule.

Foundation type and cure time. A slab foundation needs about a week to cure enough for construction. Skip this step early and you’ll pay for it later with cracking or shifting.

Local permit office turnaround. This varies wildly by state and county  , sometimes it’s days, sometimes it’s months. This is the same theme covered in our sizes guide, and it’s worth repeating: call before you order.

Site access for crane and delivery trucks. A tight lot or a long gravel driveway can slow delivery day significantly. Confirm access before your kit ships, not after the truck arrives.

DIY vs. professional install. Professional crews move faster and know how to troubleshoot mid-build. DIY saves money but adds weeks, especially for first-timers.

Season and weather window. Winter storms, spring rain, and extreme heat all slow erection. Building in the off-season for your region adds real time to your estimate.

Customization. Insulation, custom windows, and mezzanines all add finishing time. The more custom the build, the longer that final phase runs.

Kit completeness and support. This is the factor most buyers don’t think about , until something’s missing or unclear mid-build. A kit with a part missing, or vague instructions, can stall a project for days while you wait on a replacement or an answer.

This is exactly why Metal Pro Buildings ships complete, engineered kits with a support team behind them. The other six factors on this list are hard enough to manage without also wondering if your kit itself is complete.

DIY vs. Professional Install: Which Is Faster?

Neither option is “wrong.” It’s a tradeoff between time, cost, and risk.

Here’s an honest comparison:

DIY saves money. There’s no denying that. But it costs time, and it carries a real risk of rework if panels get misaligned or fasteners get overtightened.

Hidden time costs are the part people miss. A rented boom lift for a weekend often turns into a rented boom lift for three weekends. A misaligned wall panel can mean pulling bolts and starting a section over.

Professional install costs more upfront. But it’s predictable. Crews know the sequence, they’ve done it dozens of times, and they don’t hit the same learning curve a first-time DIY builder does.

Here’s the good news either way: these kits are engineered for straightforward assembly, whether you’re doing it yourself or hiring it out. And if you’d rather not DIY, Metal Pro Buildings can connect you with vetted local installers instead of leaving you to find one cold.

How to Keep Your Project On Schedule

A realistic timeline only helps if you actually protect it. Here’s how.

• Confirm your size and permit threshold first. Some sizes trigger stricter permit reviews than others. 
• Order early to avoid backorder delays. Popular sizes and steel gauges can face lead-time delays during peak building season, spring through fall especially.
• Pull permits in parallel with ordering, not after. Don’t wait for your kit to ship before starting the permit process. Run both at the same time.
• Get a kit engineered for your load zone the first time. Snow load and wind load requirements vary by region. Getting this wrong means re-engineering  and re-engineering means real delays.
• Confirm site access before delivery day. A blocked driveway or soft ground can turn a scheduled delivery into a rescheduled one.
• Work with a supplier who gives you a real itemized timeline at the quote stage. Not a vague “a few weeks,” but an actual breakdown by phase. Getting this right the first time is what separates a smooth build from a stressful one.

Frequently Asked Questions

The Bottom Line

A realistic timeline beats a fast guess every time.

It’s what stands between you and a budget surprise. It’s what keeps a missed deadline from derailing your plans.

Know your size. Know your phases. Know what could slow you down and plan around it before it happens.

Get a real, itemized timeline for your project.  Request a free custom quote from Metal Pro Buildings , no obligation, no pressure.