Yes — with the right tools and reinforcement. Containers are designed to be cut for cargo doors and conversions. The structural rule: any opening over 36" wide needs steel reinforcement around it (a "header" frame) to maintain the container's rigidity.
A shipping container's strength comes from the corner castings, the corrugated walls, and the roof working together as a stressed-skin structure. Cutting a small window (under 24" × 24") barely affects this — you weaken the wall locally but the container's overall rigidity is fine. Cutting a 6-foot patio door, on the other hand, removes a meaningful chunk of structure.
Industry best practice: any opening 36" wide or larger needs a welded steel "header" around it — typically 3" × 3" or 4" × 4" tube steel welded to the container framing on all four sides of the cut. This redistributes the structural load around the opening. Smaller cuts (windows, vents) usually don't need this.
Practical advice: don't cut a container yourself unless you have welding experience. Container modifiers exist in every region — they have the right plasma cutters, jigs, and structural know-how. Expect $300-1,500 per opening installed (window vs. door vs. patio slider). DIY plus an experienced welder for the header is a middle path.
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