| Often considered for | Detached homes, guest space, offices, or selected commercial buildings with a custom enclosed layout. | Compact storage, work, office, or approved guest-space concepts using a standardized steel shell. | Workshops, storage, pole barns, or selected residential and commercial structures. | Covered vehicle or equipment areas that may be attached or detached. | Living or working space intended to connect directly with an existing building. |
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| Layout starting point | The desired rooms and use, followed by the exact panel, framing, opening, and connection design. | One or more container modules and their fixed shell dimensions. | Structural grid, clearances, access, enclosure, and intended finish level. | Vehicle or equipment dimensions, circulation, support locations, and roof coverage. | The existing floor plan, structure, roof, utilities, and circulation. |
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| Relationship to the property | Usually evaluated as a new site-specific building; attachment is a design question. | Usually placed as a separate structure, subject to access and approved use. | Commonly detached, with the exact siting and use confirmed for the parcel. | Can be attached or detached depending on the design and property. | Designed to tie into the existing building and become part of it. |
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| Site and delivery focus | Material delivery, foundation, assembly access, weather protection, and trade sequencing. | Large-unit transport, turning and lifting access, placement area, and prepared support. | Frame and panel delivery, equipment access, foundation, staging, and assembly sequence. | Placement, post or foundation work, drainage, vehicle access, and attachment conditions. | Occupied-site access, demolition or openings, tie-ins, protection, and trade sequencing. |
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| Key review questions | Exact system documents, design team, foundation, connections, openings, utilities, intended use, and approval path. | Shell condition, zoning, transport, foundation, modifications, utilities, intended use, and permits. | Occupancy, structure, enclosure, insulation, openings, utilities, site criteria, and permits. | Attachment, structure, setbacks, access, drainage, foundation, roof system, and permits. | Existing conditions, setbacks, structure, roof and envelope continuity, utilities, occupancy, and permits. |
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