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DIY Steel Buildings: Tips and Mistakes to Avoid (From Someone Who's Made Them)

Updated on April 16, 2020
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I've lived in Flagstaff, AZ, since 2003, where I'm an active member of the Coconino County Sheriff's Search & Rescue team and an avid hiker.

A steel building can be a big investment of both money and, if you've decided to build it yourself, time and labor. So take care in deciding on a design and consider these tips, based on our own experience with a (supposedly) do-it-yourself steel building, even before you start shopping around.

Choosing Your Building: Styles, Designs and Quotes

Before settling on a building, ask yourself some questions:

  • What are your needs and intended uses?
  • How much room will you need for tools, equipment, vehicles and open space to move around and work?
  • Do you want to be able to pull through (have a garage door at either end)?
  • Do you want one or more pedestrian doors and windows?
  • Do you need a concrete slab (this may be required by your local building department) or a stem wall with a gravel or dirt floor?

Also consider your building site including slope and drainage,Read reviews for various steel building companies.

On our off-grid property, we plan to have a solar panel array along the south side of our building and house the battery bank inside, so this affected both the design and orientation of the steel building that we chose.

Talk to multiple suppliers, even if they're out of state, and get several quotes. Especially if you'll be building it yourself, you'll want to have great customer service, so it's not just about making the sale.

Below is a photo of a building we found when we were looking around at steel building online. We based our design on this one, although ours would have an overhang only on one side. One thing we learned the hard way, though, was that snow load requirements in our area meant that our overhang, unlike the one in the picture, would end up with trusses. Those trusses made the building process much more complicated, including putting up the steel siding on that side of the building. You'll see later on....

Is it Really a DIY Project for You?

When my husband and I were in the process of selecting a building and which company to purchase from, and even early on after we purchased the customized kit, we were confident we could do this on our own. We watched a number of YouTube videos (don't you just love YouTube for learning how to do just about anything?) and videos made by the manufacturer, and we really thought we had it handled. I mean, the two young girls in that one company video built theirs no problem! So we were golden.

Not so fast.

With a roof peak height of 14.5 feet an eave height of 11 ft., plus the weight and unwieldiness of some of the parts and pieces, the rafters and roofing, not to mention our lack of experience, we soon realized we were in over our heads.

For example, the uprights, rafters and roof trusses had to be assembled on the ground and each section raised into place and lifted to fit down onto the base rail (if that makes sense). Two people on their own can't raise, move and lift one of those.

We definitely needed help.

Luckily, some neighbors came to our rescue, one of whom brought a large bucket loader, which we used to lift and raise each assembled piece, while a person on either "leg" guided it into place. Here's a photo of the end result, once all uprights were raised.....

When thinking seriously about whether you can build your steel building yourself, or with whatever crew of family or friends you have, consider:

  • Size and height of the building
  • Complexity (i.e. trusses, overhangs, etc.)
  • Previous building experience (of any kind)
  • Time (yours that is)
  • Tools and equipment (What do you have on hand, and what will you need?)

Local Building Codes and Permits

Before you buy and build anything, check into local building codes and whether the size and type of structure you're planning to build will require a permit and therefore inspection. If you live within an HOA or POA, you'll want to check on CC&Rs that might apply.

Things that affect your project and whether you'll need a building permit include:

  • Location: Are you within town or city limits? On a rural property? What's the zoning?
  • Size: Buildings under a certain square footage may not require a permit.
  • Foundation: Does building code require that the size and type of building you want be on a foundation and, if so, what type? A footer? Stem wall? Slab? Other?
  • Snow load: Requirements in your area can make a difference in the type of framing (rafters, trusses) and roofing you'll need.

Delivery or Pick-Up?

Consider whether you'll have your steel building kit delivered to your building site or pick it up. Delivery can add quite a bit to the cost, but pick-up won't always be an option. In our case, we decided to use our 20-foot trailer to pick up the building parts, making sure beforehand that the longest pieces would fit on the trailer without too much overhang. Rather than pay what would have been a $500 delivery charge, we drove 2.5 hours (each way) to Phoenix to pick up the kit and roll-up garage doors, which the company loaded on the trailer for us.

While we were able to off-load the building parts by hand, be sure to have equipment (i.e. a forklift) on hand if you'll need it to off-load the kit at the building site. This applies whether you'll have your building kit delivered or will pick it up yourself.

Tools and Equipment

For our building--and others from the company that sold it to us--these are the tools and equipment we needed:

Hand tools

Impact drivers (drills)

  • with extra batteries if cordless
  • bits (our tens of thousands of tek screws were 5/16ths)

Hammer drill, if you're drilling into concrete


  • We mostly used this for tightening bolts and also for bending out pinched ends of cut pieces of metal framing

Angle grinder

Tin snips like this (We got a set of three with left, right and straight snips and used them all for the building.)

String/plumb line

Two-food level


Tape measure

Speed square, like this one (I recommend a metal one, not plastic.)


  • We needed a LOT of clamps and of various sizes and types, in part for holding siding and metal roofing sheets in place, among other uses. At one point, we had about a dozen clamps on the building.

Ladders, Scaffolding and Lifts

Eight- and 12-foot step ladders

Stackable 6-foot scaffolds (We needed four, to be able to create two sets of 12-foot scaffold at a time.)

Man-lift (We rented one for doing the roof, but it was awkward to use and ended up not being worth the money. A scissor lift would have been better, but we couldn't get one for outdoor use in our area at the time.)


Tool belt

Work gloves

Safety glasses

Magnets like this (strong ones for holding the string for our straight lines, even better with eye bolts)

Permanent marker, pencil

Getting Started

Oftentimes, even if doing it yourself, you'll need a subcontractor to do the foundation. In our case, given the rural location, we had to contact numerous companies, bigger and small, and ask other local landowners for recommendations, before we found a subcontractor willing and able to do our foundation. He and his crew did a great job, but we did have to be patient and wait a few months for them to get to our project.

In the photo below, you'll see our perfectly level stem wall--so we had a great base to start with--the four caissons for the overhang pillars and the packed gravel floor.

Before You Start Building

Take your time. Don't rush into the building process before you make sure you have everything and do some quality control. I speak from experience here ... and learned this the hard way when we were well into putting up the building. So don't do what we did. Instead...

  • Lay out parts and pieces. Using the parts and packing list you should get from the manufacturer, make sure you have everything, right down to the smallest hardware. (We ended up having to call the company and have them ship and sometimes overnight multiple missing items, multiple times, as we discovered what we DIDN'T have ... right when we needed it.)
  • Count and measure. For all batches of the same parts, count and count again. Are they all there? And are they all the exact same size? Even a quarter inch--definitely a half-inch--can make a noticeable difference if a rafter isn't the same length as the rest. If it's too long, at least you can trim it to size. Too short ... well, that's a bigger problem.
  • Measure again. If you look closely (or even not-so-closely) at our roof, especially when the sheeting is on, you'll know why I say measure again.
  • Duplicate. Here I'm referring to something like assembling trusses on the ground. Do it the same way each time. Stack them on top of each other. Are they exactly the same?
  • Level. Pretty self-explanatory, but take the time to make sure things are as level and plumb as can be, every step of the way. If there are multiple people working on your building, you may each want to have a level. Make it your friend.

The frame of the main building is up. An important note if your building is similar: until siding goes up or hat channel on the roof, clamp 2x4s between uprights to keep them stable and from bending or swaying in the wind or from their own weight.
The frame of the main building is up. An important note if your building is similar: until siding goes up or hat channel on the roof, clamp 2x4s between uprights to keep them stable and from bending or swaying in the wind or from their own weight.
Double check with your level as you go. Adding on to the building can make things shift.
Double check with your level as you go. Adding on to the building can make things shift.

Checking As You Go

As mentioned above, measuring carefully and checking that things are level both horizontally and vertically is really important and worth the time. It can really save you time in the long run and a lot of headaches as your building progresses. Hat channel on the roof relies on the rafters being level and evenly spaced. Roofing relies on level rafters and hat channel. Garage doors will be an even bigger challenge to hang and have function properly if your door jambs and headers aren't correctly spaced and level. And so on and so forth.

In the photos below, you'll see the overhang framework was added. This affected the leveling of the main frame of the building, so we had to recheck every upright and rafter and make some adjustments. In the second photo, the siding starts going up. If your uprights aren't level and in line, your siding will be wavy (like ours).

Mistakes We Made ... and Want You to Avoid

Here are some goofs we made--most people wouldn't notice most of them, but I know they're there--and things we learned the hard way. Some we could fix; others are goofs there to stay.

1. When adding the overhang, inconsistency in the angles of the trusses threw off the level of the roof line. We had to make some adjustments while on ladders and scaffold, removing tek screws, shifting parts and plates, and screwing them back on. Also, the addition of the overhang shifted the frame of the main building a bit. Had we put up the hat channel on the roof beforehand, this would have stabilized the building and there would not have been much, if any shift. Problem was, the manufacturer had forgotten to put the hat channel on our trailer when we picked up the building and we hadn't noticed soon enough. At this point, we were still waiting on those to be delivered to us (at no extra charge to us), so we continued building out of what should have been the order. Another good point to stress making sure you have all parts and pieces on hand before you begin.

2. Here you see the hat channel, which we finally received, going on the roof. If your building is similar, be sure your spacing is even and that the hat channel is level. If any of them are off, you'll notice it when you put your roofing on. That steel sheeting doesn't hide imperfections very well at all.

3. Did you know that siding has a right side up? We didn't. And the instructions that came with the building were not clear on that bit. We overlapped the ridges and did our best to make sure the siding was going up evenly (from side to side) and level, but we had no idea our siding was upside down until an experienced neighbor-helper-friend pointed it out ... when the siding was almost finished. Does it make a significant difference, though? To us, not really ... although the seams are more significant with the siding upside down.

4. This wasn't a mistake, just something to think about. If you'll need to trim siding or cut it to the shape and slope of the building as we did, you'll either need to put it up temporarily to measure and mark and then take it down to cut OR put it up and cut it while in place. The manufacturer recommended the former. We chose the latter. We put it up and then used our angle grinder and tin snips to trim and cut it in place.

5. (Above) Remember I said that the overhang trusses made putting up the siding more of a challenge? You can probably see why in the photo, with the way the trusses and rafters of the overhang connect with the building. Having horizontal siding made it MORE complicated, but even vertical siding would have required a lot of additional measuring, cutting and maneuvering to get the siding up there. Even the manufacturer hadn't thought about that, and there were no specific instructions included. A follow-up call didn't help. So we figured it out on our own.

So another thing to think about when choosing a design. Also, the overhang and the extra space created by the hat channel between the rafters and the roofing means there's a gap of a couple of inches between the top of the siding and the roof. That's not really an issue for us, especially since our building is not insulated or supposed to be air-tight. But if that's an issue for you, consider how any overhangs will affect your building in that way.

6. (Below) When it came to the posts and tri-header for our overhang, we had a few issues that came together to create a problem. First, while the concrete caissons on the ground that we started with were perfect (thanks to the subcontractor), we didn't place the posts in exactly the same way on top of the caissons. Second, we didn't notice (because we didn't check carefully enough from the get-go) that one of the steel posts was not strait. It had been welded to its base a bit off, so it was bent a bit. That meant that the top of the post ended up leaning about half an inch to the side, which in turn meant that the spacing between the top of that post and the next was thrown off. Since those tri-headers you see in the photo were cut in order to meet in the middle of the top of each post, one tri-header ended up barely sitting on top. We had to add additional plates to ensure it was secure.

You can see what I mean in the photo below, which is before we added the extra plates.

7. (Below) It may be a little difficult to see in the photo, but there's a bit of a wave to the roofing. That's because those rafters aren't exactly even and level with one another. Like our other goofs, it doesn't affect the strength or stability of the building, which is held together with thousands of tek screws, but aesthetically it bugs me (I'll get over it ... eventually).

Also, if you look on the far right, you'll see that we have one bit of roof sheeting to go, which will need to be cut lengthwise to fit. Thing is, it's not an even cut because that last bit is narrower at the top than the bottom of the roof/overhang. That's because we were off when we started from the left end of the building. Which is because my husband (shame, shame!) didn't carefully measure things and the error continued down the line. While we made the adjustment on that last sheet on the right and cut it at an angle, it's yet another "imperfection" in the building ... that I know is there. So keep in mind that one goof can carry though to create others.

Bay Doors: A Challenge of Their Own

8. Beware of roll-up doors, which have springs. Those things can be dangerous, so make sure you're clear on the instructions and are very careful when installing. Experienced help is a big plus. These things are heavy too, so either have the proper equipment to raise the door(s) into place or come up with a pulley system like we did (sorry, I don't have pictures of that). In our experience, it takes three people (four is better if you have the help) to raise and install these doors, especially if you're a novice.

You really want to make sure your door openings are the right size and the jambs and header are level, or you'll have difficulty installing the door(s). For one of ours, we had to add a steel extension on one jamb, because it was too narrow to screw the bracket for the door into it.

Properly tensioning the springs is also tricky.

Not Perfect, But Solid

All in all, considering the number of issues with quality control on the part of the manufacturer (parts cut incorrectly), missing parts and hardware that had to be shipped to us along the way, our lack of experience and our lack of care when it came to double-checking the lengths of parts, our own measurements and the level, the building ended up looking quite good overall, and it's definitely sturdy. We passed the county inspection with no problem and have been making good use of and enjoying our building, which is the first on our property.

But there are a number of things we know now that we didn't when we started and would do differently (or more carefully). If you have any questions about our experience with purchasing and building our steel workshop, please feel free to contact me or leave a comment or question below.

This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.

© 2020 Deb Kingsbury


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