What an architectural BIM base includes
An architectural BIM base organizes the building information required for the next stage of architectural work. Its precise content depends on the brief: there is no universal package implied by the word BIM. A useful agreement identifies the elements to model, their information requirements and the limits of what the source drawings can establish.
Define the architectural elements
Discuss walls, floor slabs, doors, windows, stairs and other elements relevant to the project. For each group, decide whether location and overall size are sufficient or whether additional attributes are needed. Identify existing and proposed conditions where applicable. Roofs, complex junctions and unusual components deserve explicit discussion because a general list may conceal different expectations. Use a marked-up plan or a scope schedule so the practice and modeler can point to the same included areas.
Set the information depth
Agree the level of detail through concrete examples. A wall might need its thickness and type name without a fully resolved construction build-up; a window might need opening dimensions without fabrication information. These are project decisions, not promises attached automatically to a numerical label. Make provisional selections visible and distinguish them from confirmed design information. The objective is enough dependable information for the intended use, with a clear path for later development if the practice needs it.
Draw the responsibility boundary
An architectural base does not automatically include structural engineering, building services design, calculations or verification against regulations. Show where those disciplines need to provide information and how it will be referenced. Likewise, modeling an existing building from plans does not establish that every on-site dimension or concealed condition is correct. Agree how the model records unverified information and who approves the assumptions. This boundary helps collaborators use the file without reading more certainty into it than the evidence supports.
Make the base measurable
- List included floors, areas and element groups so acceptance does not depend on a general expectation that everything visible must be modeled.
- Describe a representative wall and opening with the exact geometry and attributes needed now, marking any construction choices that remain provisional.
- Keep a short list of engineering, specialist and site-verification responsibilities so later users understand which questions the architectural base does not resolve.
Review a representative plan, a section and the agreed element groups. Check the output format, names and levels as well as geometry. Record anything deferred to another stage. A clear architectural base is useful because its purpose and limitations are understandable. It gives the practice an organized starting point while leaving further design, coordination and verification with their agreed owners.
General guidance: each project's scope is confirmed before commissioning.