How to Build an RV Steel Storage Building

Measure the RV, including all attachments that you may want to keep on it, such as bikes and storage containers. Add at least two feet to the dimensions and then use these dimensions as guides for sketching your building. You'll likely need a building permit, so check with the local building department and, if you do, then seek out a licensed architect or engineer who can prepare official drawings and specifications.

Find or prepare a level area raised slightly above the surrounding terrain. Mark out the building's footprint by hammering four corner stakes to mark corner posts and attach a string line around the perimeter. Cross-measure to make sure that the diagonals are equal and the shape is perfectly rectangular. Hammer in stakes to mark steel posts in addition to the corner ones.

Dig out post footing holes according to the specifications using a mechanical, hydraulic auger or other digging equipment. Depending on your specifications, you will either set the posts directly into the ground or pour a concrete footing first and then bolt the columns onto the footings. Use mechanical lifting equipment to lift the steel posts into place and keep them level with wooden bracing until the roof trusses are added.

Affix a stringer on top of the posts using necessary hardware. Raise and mount trusses, or arcs, one by one using wood bracing to stabilize the first one. Once the first truss is mounted, the subsequent trusses may be stabilized against each other using cross bracing and roof purlins on top of the trusses.

Attach all remaining roof purlins using an electric drill and stainless-steel metal screws. Then mount sheet-metal roofing panels beginning from a lower corner. Attach the ridge piece at the crown of the roof and any vents, as well as trim along the sides of the roof.

Dig trenches and run any electrical wires and plumbing into the garage. Make a temporary wooden frame if you will be pouring a concrete slab and pour the slab with adequate rebar for a heavy RV vehicle before erecting walls.

Install galvanized metal framing for your walls including adequate structural support for the frames of windows and doors. Attach rigid foam insulation or batt insulation, a waterproof sheathing wrap and then the final exterior siding. Install door and windows and remaining metal trim and details.