Scan to BIM Brief Checklist

Start with the intended use of the model

A base model for concept planning may require a different scope from a model supporting detailed renovation documentation. Identify the elements to include, the areas to cover, required views or sheets, and the intended level of information. Avoid using a broad detail label as a substitute for an element-by-element scope.

State what is excluded, such as concealed assemblies, inaccessible roof areas, or services that were not captured. The model should not imply certainty about hidden conditions just because software makes those elements easy to draw.

Describe the survey and coverage

Provide the registered scan data in the agreed format, survey information if available, units, orientation, and any control references. Note the capture date and known coverage gaps. Photographs can help interpret an ambiguous surface, but they do not automatically establish reliable dimensions.

Confirm who is responsible for registration quality and how suspect alignment is escalated. If adjoining scan positions disagree, the modeling team should ask for a decision instead of distributing the error invisibly through the building.

Agree a tolerance and uncertainty approach

The required modeling tolerance should reflect the intended use, available evidence, and survey quality. Specify how irregular walls, sloping floors, and non-orthogonal conditions should be represented. A simplified wall may be appropriate for one purpose and misleading for another.

Use an assumptions register for uncertain openings, inaccessible areas, and inferred elements. Decide whether those items need a separate visual status, a parameter, or a note in the handoff. Do not confuse a clean model with a verified survey.

Review a representative model area

Choose a small area with several relevant conditions: an opening, a change of level, a junction, and an irregular element if present. Compare the model with the scan in plan and section. Review the resulting sheet or export as well as the 3D view.

This checkpoint can reveal disagreements about geometry simplification, family choice, coordinates, and output requirements before the approach is repeated across the whole building. Record the approved method and apply it consistently.

An illustrative first package

A trial might model one accessible floor or a selected zone from the supplied registered cloud and produce an agreed plan and section. Its scope would explicitly exclude unscanned rooms and concealed construction. The example is a suggested trial format, not a claim about a past Nest assignment.

Evaluate the match to the source, the usefulness of extracted drawings, and the visibility of uncertainty. The trial is also an opportunity to confirm file size, transfer arrangements, software release, and review access before a larger model is commissioned.

Prepare the final handoff

List the native model, linked or referenced files, agreed exports, drawing outputs, coordinate information, and assumptions log. The model should open in the agreed environment without relying on undocumented local file paths. Ask your lead to review the package for its intended use before relying on it for further decisions.

For a Scan to BIM brief with Nest, describe the building, available capture, model use, and deadline. Send a controlled sample only after confidentiality and transfer access are agreed. Nest can then identify the questions needed for a useful scope review.

Explore the next step

Review Scan to BIM services for the service scope, and compare as-built drawing services where it relates to your workload. The pilot project process explains the first assignment; our production scenarios describe typical inputs and outputs.