Hey everyone, thanks for stopping by! If you’re here, chances are you already know how dope 20ft expandable container houses are—they’re affordable, flexible, moveable, and way easier to set up than a traditional stick-built home. But let’s be real, one tiny downside for a lot of folks who rock these (or are thinking about it) is the lack of outdoor space. You want somewhere to sip your morning coffee, grill on weekends, or just chill without being on top of your neighbors, right? Well, I’m part of a team that supplies these bad boys, and we’ve helped so many customers add a balcony to their 20ft expandable container house. Today, I’m breaking down exactly how we do it—no fancy jargon, just real, actionable stuff we’ve tested over and over. 20ft Expandable Container House
First off, let’s get one thing straight: this isn’t a random DIY project you wing without checking a few basics. Before you even grab a screwdriver, you gotta do the prep work. Most 20ft expandable containers we supply have a standard exterior frame made of steel, but that frame is where your balcony is gonna mount to—so you need to make sure it’s up for the job. Wait, and not just the frame: check the weight capacity of the container’s foundation, too. If you set your house on cinder blocks, make sure they’re evenly spaced and each block can handle at least 500 lbs (balconies add weight from the floor, people standing there, grills, whatever). If it’s on a concrete slab, that’s usually a safer bet, but still double-check with a local structural guy—no need to skip this step and end up with a wobbly mess.
Another big prep thing: local building codes. I know, I know, rules suck, but some areas don’t allow balconies that stick out more than 3ft, or require railings at least 36in high, especially if you have kids or pets. We’ve had a customer in Austin try to skip this, and got a fine because his balcony was too close to the property line. Save yourself the headache—call your city’s building department, ask for the rules on attached balcony for tiny homes (that’s what these are classified as in most places), and jot down the deets. That way you don’t build something and have to tear it down later.
Okay, now that prep is done, let’s talk about the actual balcony options. The best part? You don’t have to build it from scratch. We sell pre-made balcony kits that fit exactly our 20ft expandable houses, but if you’re handy, you can source materials locally too. Let’s go over both, since not everyone’s the same.
First up, the pre-made kit route—this is the easiest way, no question. Our kits (and most reputable ones) are made with weather-resistant steel frames and either composite wood or aluminum floors, which hold up way better than regular wood in rain, sun, snow, whatever. The key here is making sure the kit is sized for a 20ft container. A standard 20ft expandable is 8ft wide when expanded, so a balcony that’s 8ft long (same as the house) and 3ft deep is perfect—enough space for a small table and two chairs, not so much that it overhangs too much or is hard to mount. The kits come with all the hardware you need: bolts, brackets, even the drill bits. One pro tip here: don’t use regular household bolts. Use hot-dipped galvanized bolts—they don’t rust, even if they get splashed with water or exposed to salt air if you’re near the coast. We learned that the hard way a couple years back when a customer in Florida used regular bolts, and a year later they were corroded and the balcony felt loose.
If you’re the DIY type who wants a custom look, building your own is doable. Let’s keep it simple here: start with the frame. Use 2×4 pressure-treated lumber for the base (or steel, if you want it super durable) and attach it to the container’s exterior frame using heavy-duty L-brackets. Wait, how many brackets? At least four—one at each corner, and one in the middle of each side, so the frame is evenly supported. For the floor, composite decking is ideal because it doesn’t rot, but if you’re on a budget, cedar works too—just seal it every year. And the railing? Mandatory, remember building codes. For a custom look, you can do horizontal wood slats, vertical metal bars, or even glass panels if you want a more modern vibe. Just make sure the gaps between slats or bars are no more than 4in—you don’t want a kid’s head getting stuck, trust me.
Wait, hold on—when do you add the balcony? Is it before or after you expand the container? That’s a question we get all the time, and the answer is: both, but before is way easier. If you add the balcony while the container is still in its collapsed, travel position, you have way more space to work underneath, no climbing ladders while holding bolts, no awkward angles. We always recommend our customers mount the balcony before expanding the house. But if you already expanded it, it’s still doable—just take your time, maybe get a helper, use a step ladder that’s tall enough, and make sure the area around the house is clear so you don’t trip.
Now, mounting the balcony is the most important step, so let’s break that down step by step, like we do for our customers. First, measure the exact spot where you want the balcony to go. Most people put it on the side that has the main door, so you can step right out from your living space onto the balcony. Mark the four mounting points on the container’s frame with a pencil—make sure they’re level, or your balcony will be sloped, which is bad for water runoff (you don’t want rainwater pooling on your balcony and leaking into the container, right?). Next, pre-drill holes through the container’s exterior frame and the balcony’s frame—this makes it way easier to drive the bolts in, and prevents the metal from cracking. Then, have your helper hold the balcony up (or if it’s light, use a small ladder to prop it in place) and slide the bolts through the pre-drilled holes. Tighten the nuts with a wrench, but don’t over-tighten—you want it secure, but not so tight that you bend the metal frame. Finally, add the floor and railing, double-check that everything is level and wobbly, and you’re good to go.
Wait, are there any mistakes we see people make all the time? Let’s list those out so you can avoid them. First, not accounting for water runoff. If your balcony is sloped towards the container wall, rainwater will leak into the edge of the house. So slope it slightly away from the container—like 1/4in per foot of length—that’s enough to let water drain off, no pooling. Second, using too few mounting brackets. We’ve seen a balcony fall off (rare, but it happened once) because someone only used two brackets instead of six. Don’t skimp on hardware, that’s not the place to save money. Third, not securing the balcony to the container’s frame, not just the foundation. Some people think if the foundation is solid, they don’t need to mount the balcony to the house itself—nope, that’s how it swings in the wind. The container’s frame is made to hold that kind of load, so use those brackets. Fourth, forgetting to finish the materials. If you build a wooden balcony and don’t seal it, it’ll rot in a couple years. If you use steel bolts and don’t paint or galvanize them, they’ll rust. Small step, big payoff.
Let’s also talk about extra stuff to make your balcony actually usable, not just a spot that’s there. Since it’s attached to a tiny container house, space is limited, so don’t overcrowd it. A small bistro set (two chairs and a round table) fits perfectly on an 8x3ft balcony. If you like grilling, a small tabletop grill works—just make sure it’s at least 10ft away from the container’s windows or doors, per fire code. String lights are a must for evening vibes—they’re lightweight, easy to attach to the top of the railing, and make the space feel cozy. Also, if you’re in a hot area, add a small patio umbrella or a retractable awning—20ft containers can get warm, so shade is key. We actually sell a retractable awning that fits exactly above our container house balconies, works great.
Now, a quick note on cost, because we know that’s a big factor. A pre-made balcony kit for a 20ft container is usually between $500 and $1,000, depending on the size and material. If you build your own, it’s around $300 to $700, depending on if you use steel or wood. Compare that to adding an actual room to your house, which is way more expensive—balconies are a budget-friendly way to add usable outdoor space. And if you ever move your container house, you can take the balcony with you! Most of our customers who relocate their homes just unbolt the balcony, take it apart (or keep it assembled if it’s light enough), and re-mount it at the new spot. No permanent modifications that you have to leave behind.
Wait, one last thing—if you’re not sure you can do this on your own, or you don’t have the tools, our team can help. We do custom balcony installations for our customers, we’re familiar with all the rules for different areas, and we use materials that are designed to work specifically with our 20ft expandable containers. We also offer a 1-year warranty on all our balcony products and installations, so if something goes wrong, we’re here to fix it. No hidden fees, no runaround, just real support.
Look, at the end of the day, a balcony for your 20ft expandable container house isn’t just a luxury—it’s a way to make a small space feel way bigger, and add that outdoor living area everyone wants. It’s doable, it’s affordable, and if you follow the steps we laid out, you won’t have to worry about it being wobbly, leaking, or not up to code.
If you’re ready to take the next step—whether you want to ask about pre-made kits, get a custom quote for an installation, or just have more questions about fitting a balcony to your specific container house—hit us up. We work with customers all over, and we’re happy to walk you through every part of the process. Don’t let your tiny home (or future tiny home) miss out on that perfect morning coffee spot.
Z-folding Container House References
American Tiny House Association. (2022). Balcony Design & Installation Guide for Tiny Homes.
International Residential Code (IRC). (2021). Section R312: Decks, Balconies, and Porches.
Container Home Builders Association. (2023). Modifications for 20ft Expandable Container Structures.
Tangshan Jingrong Trading Co., Limited
With abundant experience, we are one of the most professional 20ft expandable container house manufacturers and suppliers in China. Please feel free to wholesale customized 20ft expandable container house made in China here from our factory. For price consultation, contact us.
Address: Room 1103, Tangshan Rongtong Building, Lubei District, Tangshan City, Hebei Province.
E-mail: Linda@tscontainerhouse.com
WebSite: https://www.tscontainerhouse.com/
