Repeated floors: organizing a building by level
Repeated floor plans can make a modeling assignment more efficient, but they also make repeated mistakes easier to spread. Before describing a building as typical, check where the floors differ and how the model should represent those differences. An agreed level structure and an exception register are more useful than an assumption that every storey matches.
Confirm what actually repeats
Compare the footprint, core, openings and internal arrangement across the relevant floors. Look for changes at ground level, the roof, terraces and service areas. Check floor heights and stair relationships as well as plan geometry. Identify which source drawing governs each level, including any local amendments to a typical plan. A note stating typical floor should not override a later drawing showing a specific exception. Ask the practice to confirm the hierarchy where those references conflict.
Create a level and exception schedule
List every floor included in the assignment, its elevation and the drawing used as its primary reference. Add a short column for exceptions such as shifted windows, altered partitions or different slab edges. Use the same level names across the brief, model and review comments. Clarify whether any repeated arrangement is provisional and likely to change. The provider can then choose an appropriate working method without losing sight of the information that must remain distinct at each level.
Review the representative floor first
Agree an early check of the typical arrangement before it is applied throughout the building. Inspect a section, the main circulation and the important opening types. After repetition, review the exceptions independently instead of assuming that approval of one level approves all others. If the practice changes the typical arrangement, identify the levels affected and those that must retain their differences. Keep revision comments precise enough that a correction does not inadvertently overwrite a deliberate exception elsewhere in the building.
A repeated-floor check
- Compare the nominally typical floors for changes in openings, core layout, floor heights and exterior edges before accepting that the geometry repeats unchanged.
- List the drawing governing each level and record local exceptions beside it, using the same floor names in briefs, models and review comments.
- Approve the representative arrangement before repetition, then review exceptions separately so an efficient workflow does not erase intentional differences elsewhere in the building.
For BIM12, a project is defined as up to four floors; confirm how the actual building fits the agreed plan before commissioning. Repetition does not remove the need to identify each included floor. A clear schedule helps both commercial planning and technical review, giving the practice a dependable map of what will be delivered and what needs separate attention.
General guidance: each project's scope is confirmed before commissioning.