The most common regret garage owners share is simple: they built it too small. Choosing the right metal garage size up front costs far less than adding on later. It also makes the garage easier and safer to use every day.
This guide walks through the main factors to consider before you order a steel garage.
Start Your Metal Garage Size Plan With What You Store
Make a list of everything that needs to fit inside. For example, include cars, trucks, a boat, a trailer, a snowblower, lawn equipment and bikes. Then measure the largest items, including mirrors and hitches.
Next, add room to walk around each vehicle and open doors fully. As a rule, people underestimate how much space they need just to move comfortably.
Plan for Workspace and Storage
Many garages double as workshops. If you plan to use tools, add space for a workbench, tool storage and room to work around projects.
In addition, think about shelving and overhead storage. Taller sidewalls let you add a loft or high racks, which frees up floor space for vehicles.
Choose Door Sizes Carefully
Door size often matters as much as the overall metal garage size. For instance, a pickup with a ladder rack or an RV needs a much taller door than a sedan.
- Measure the height and width of your tallest vehicle or equipment.
- Add clearance for snow, ice and future vehicles.
- Consider a walk door for everyday access.
- Plan door locations so you can drive in and out easily.
Because the steel structure frames each door opening, decide on them early. Changing door sizes later can require changes to the engineering.
Height Matters as Much as Metal Garage Size
Height is easy to overlook. However, taller walls give you room for a car lift, tall doors, overhead storage or a loft. They also make the space feel more open.
Roof pitch matters too. In snowy areas, the roof design affects how snow sheds and how much load the frame must carry. Our guide to metal building snow loads explains why.
Leave Room to Grow
Your needs will likely change. For example, you may add a vehicle, start a hobby or need more storage. Planning a little extra space now is usually cheaper than expanding later.
If you do need more room in the future, engineers can often design steel buildings for future bays or lean-tos. Our article on whether to expand or build new covers that decision.
Check Your Site and Local Rules
Finally, make sure the garage fits your lot. Setbacks, height limits and driveway access all affect the final size. Therefore, check with your town before you finalize the design. Our guide on metal building permits explains what to expect.
A Quick Metal Garage Size Checklist
- List every vehicle and large item you will store.
- Measure the biggest items, including mirrors and racks.
- Add space for walking, opening doors and working.
- Choose door sizes for your tallest vehicle.
- Decide on sidewall height for lofts, lifts or storage.
- Add room for future needs.
- Confirm setbacks and height limits with your town.
For more on how engineers design steel garages, see the Metal Building Manufacturers Association.
Talk to Maine Metal Buildings
Want help choosing the right size? See our New Hampshire metal garages page or send us your list, and we will suggest a layout. Our team typically responds within 24 hours, and detailed quotes are usually ready within 7–10 business days. Contact us or call (207) 591-0196 to start your project.
