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A renovation BIM handover is not a single file or a universal checklist. The owner or appointing party should define the project information requirements, then the delivery team should convert them into a BIM execution plan (BEP) that names each deliverable, its purpose, format, milestone, owner and acceptance test. In practice, a useful package may combine native authoring models, an open exchange model, coordination files, drawings, asset data, point-cloud sources and record documents. The right model detail level is likewise set element by element for the intended use and the evidence available—not by choosing one LOD number for the whole building.
This guide explains what to put in renovation requirements, how to choose formats such as RVT and IFC, and how to separate model detail from the accuracy of existing-condition information.
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What should a BIM renovation handover include?
Start with the uses the owner needs after each project stage. A handover for space planning is different from one for fabrication, quantity work, coordination or facilities operations. Write those uses into the project BIM requirements and BEP; the word “BIM” by itself does not define scope.
NIBS Project BIM Requirements guidance says the owner should set the deliverable format for each BIM use and data deliverable, together with an expectation for each model deliverable. Its BEP Standard treats planning as a sequence of information requirements for participants and a means for the owner to define what the delivery team must provide.
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For every line in a deliverable schedule, record:
- Purpose and BIM use: for example, design review, clash coordination, construction, estimating, asset operation or archival viewing.
- Deliverable name and scope: discipline, building area, systems and exclusions.
- Responsible party: author, checker, approving party and final recipient.
- Milestone and status: survey, concept, developed design, construction issue, practical completion or closeout; identify whether the file is draft, reviewed, approved or record.
- Required content: geometry, classification, parameters, asset attributes, specifications, photographs or links to source evidence.
- Format and version: native software and release, exchange schema or view where applicable, CAD/PDF office formats, spreadsheet template and point-cloud format.
- Coordinates and metadata: project coordinate system, units, shared coordinates, file naming, revision, author and status fields.
- Review and acceptance: model checks, data completeness rules, drawing checks, file-opening tests and who signs acceptance.
- Archive treatment: which files are retained as the contractual record, where they are stored and how future users can view them.
This level of definition prevents a common dispute: one party believes “the BIM model” means an editable design file, while another expects a federated coordination model, an as-built record and an asset register.
Which phases and files belong in a renovation schedule?
A phase-based schedule is useful, but examples from one owner must not be mistaken for a universal standard. The Smithsonian Office of Planning, Design, and Construction’s November 2024 BIM Guidelines illustrate how requirements can grow from programming through closeout.
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| Phase | Possible deliverables | Decision to make in the BEP |
|---|---|---|
| Programming and existing conditions | Project narrative, project execution plan, existing-condition model, point-cloud source where applicable, asset-data spreadsheet | What evidence is authoritative, how existing conditions will be represented, and which assets need attributes now |
| Design milestones | Drawings, design-intent models, LOD matrix, specifications, GIS exports and updated asset data | Which design information is required at each review, and what geometry or parameters must be complete |
| Construction and coordination | Coordination or construction models, approved submittal information and continuing asset records | Who federates models, which disciplines participate, clash-review rules and revision naming |
| Closeout | As-built model, record drawings, operation and maintenance documents, warranties and final asset information | What “record” means, what was verified in the field, and which files are retained for operations |
The actual contract may require fewer, more or different items. Treat the Smithsonian list as an example of phase logic, not as a renovation checklist that applies everywhere. Owner requirements, consultant appointments and local regulations govern.
Should I ask for RVT, IFC or both?
Ask for the formats that serve each downstream use. A native authoring file and an open exchange file solve different problems, so specifying only one can leave an important gap.
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- Native authoring model (for example, RVT where that is the authoring environment): preserves editability in the software used to create it. Request it when the owner or successor team must continue developing the model, inspect native parameters or maintain a discipline model.
- IFC or another open exchange format: supports exchange outside one proprietary environment and can improve long-term accessibility. It is not a guarantee of lossless conversion; property support and interpretation vary between applications. State the IFC schema, exchange view or model view definition, and required property sets when they matter.
- Coordination and viewing files: formats used by the project’s coordination or review platform may be smaller, federated or easier for non-authors to inspect. They should not be assumed to be editable source models.
- CAD and document formats: DWG can support 2D/technical workflows; PDF is suited to issued drawings and record reading; DOCX can carry narratives; XLSX can carry structured asset registers. Specify whether each is an issued record or a working file.
- Point-cloud sources: retain the format and registration information needed to trace the existing-condition model back to survey evidence. The required point-cloud format depends on the capture workflow and owner’s software.
Singapore BIM Guide Version 2 states: “Collaboration parties shall also agree on the BIM exchange protocol and submittal format (proprietary or open standard) in the BIM Execution Plan.” It recommends existing open standards where available and mutually agreed reusable formats where an open standard has not been finalized.
That means the BEP should list, for every exchange, the authoring software and version, export settings, schema or view, coordinate reference, units, naming rules, validation software or procedure, and the recipient’s acceptance test. Do not rely on a promise that “the files are compatible.” Define what compatibility means for the actual use.
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What is the difference between model detail and survey accuracy?
Model detail describes what the model contains and how it is represented. Source accuracy describes how closely the modeled existing condition corresponds to the building and the evidence used to document it. They are related, but they are not the same thing.
An existing-condition model can look highly detailed while being based on incomplete investigation. Conversely, a deliberately simplified model can be surveyed and verified to a clearly stated tolerance. The model’s visual richness is not proof of dimensional accuracy.
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The existing-conditions guidance says the appropriate detail depends on project needs and is determined during BEP development. It calls for a native model plus interoperable formats, consistency with georeferencing requirements and the BEP, and minimum detail by system or element where that is needed before team selection.
For each element or system, write a requirement in this form:
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors- What is modeled? Identify the element, system, zone and exclusions.
- How is it represented? State geometric extent, classification, required parameters and relationships.
- Why is it needed? Tie the content to a specific use such as layout, coordination, quantity, fabrication or operations.
- When is it required? Set the milestone and the status expected at that point.
- What is the evidence? Identify survey, scan, record drawing, visual inspection, contractor submittal or other source.
- How is it accepted? Define checks for completeness, location, attributes and stated accuracy.
Use LOD terminology only with its intended definition and edition. NIBS lists the BIM Forum Level of Development (LOD) Specification (2023) and the U.S. Institute of Building Documentation Level of Accuracy (LOA) Specification (2016) as separate BEP references. In your requirements, state both the development/detail expectation and the accuracy or verification expectation for existing conditions. If a tolerance is required, the contract must define it; the sources do not establish a universal renovation tolerance.
How do I write an element-by-element LOD matrix?
A useful matrix avoids assigning one number to an entire building. Put systems down the rows and milestones or uses across the columns, then add notes for evidence and acceptance.
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| Element or system | Intended use | Required model content | Source and verification | Acceptance check |
|---|---|---|---|---|
| Existing partitions | Space planning and coordination | Location, thickness category, openings and room relationships; identify uncertain areas | Registered scan, survey or verified record drawing, as stated in the BEP | Coverage of required rooms; coordinate check against agreed evidence |
| Mechanical equipment | Clearance coordination and asset operations | Equipment geometry, access zones, tag, manufacturer/model fields where available | Field verification and approved equipment data | Required attributes populated; access zones reviewed |
| New fabrication-sensitive components | Fabrication or installation | Geometry and connections to the extent needed by the fabricator | Approved design and trade information | Discipline and coordination review against the fabrication requirement |
The examples show the method, not prescribed content. A heritage renovation, a tenant fit-out and a plant-room replacement will need different rows, evidence and checks.
What should the existing-building survey and model say about uncertainty?
Existing conditions are often incomplete, concealed or changed since the last record drawing. The deliverable should expose that uncertainty rather than implying certainty through graphic detail.
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- Mark areas not accessed, not scanned or inferred from secondary records.
- Keep a source register linking significant modeled conditions to scans, survey points, photographs, drawings or field notes.
- Record coordinate systems, registration method and units so another party can reproduce the spatial context.
- Separate “modeled as observed,” “modeled from record information” and “assumed for design” where those categories affect decisions.
- Require a change or verification log when construction discoveries alter the model.
A laser distance measurer may help collect dimensions for existing-condition documentation, but it does not by itself create a verified BIM model or establish that a survey meets a contractual accuracy requirement. The instrument, method, control network and acceptance criteria belong in the project’s survey and BEP requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should reviews, approvals and closeout be defined?
Make review a deliverable attribute, not an informal email exchange. The schedule should name the checker, approving party, review date, status code, comments process and resubmittal rule.
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- Author self-check: confirm naming, coordinates, required views, parameters, links and file opening.
- Discipline check: verify scope, geometry and data against the discipline’s requirements.
- Federation or coordination check: combine the agreed models and run the project’s interference, clearance or spatial reviews.
- Owner review: check the intended use, required asset fields, drawings and record status.
- Acceptance and archive: issue the approved revision, retain rejected or superseded records as required, and preserve the native, exchange and document files needed for future access.
At closeout, distinguish an “as-built” or “record” model from a design-intent model. State which elements were verified, which were updated from contractor information, and which remain based on earlier evidence. Include O&M documents, warranties, record drawings and the final asset register only if the owner’s requirements call for them—but if they are required, define their file formats and identifiers alongside the model.
What mistakes make renovation BIM handovers unusable?
- “Deliver BIM” with no use case: replace the slogan with a dated, owned deliverable schedule.
- One LOD number for everything: use an element-by-element matrix tied to uses and milestones.
- Native-only delivery: add an agreed exchange and viewing/archive format where future access requires it.
- IFC-only assumptions: specify schema, property requirements and validation; do not promise lossless conversion.
- Detailed geometry mistaken for accuracy: document source evidence, uncertainty and any required tolerance separately.
- Missing coordinates and metadata: define the reference system, units, naming, revision and status fields before authoring begins.
- No acceptance test: state who checks completeness, attributes, coordinates, file opening and record status.
- Using an example owner’s checklist as a contract: adapt examples such as the Smithsonian schedule to the actual owner, jurisdiction and appointment.
Which standards and dates should a project team verify?
Confirm the edition named in the appointment and BEP. The NIBS guidance is U.S. National BIM Standard project material; the Smithsonian schedule is an institution-specific example dated November 2024; the Singapore guide is jurisdiction-specific; and the existing-condition standard is dated 2015. Standards, software releases, exchange support and local rules can change, so the contract should identify the governing versions and what happens when a required format is superseded.
For a renovation team, the practical sequence is straightforward: define uses and recipients, schedule deliverables, assign formats and versions, set element-level detail and accuracy requirements, then agree the review and archive process in the BEP before production starts.
Frequently Asked Questions
Can an owner open an IFC file without the authoring software?
Often an IFC viewer or another BIM application can open it, but the result depends on the IFC schema, export settings and the receiving application’s property support. Require a sample exchange and a documented validation procedure if independent access is important.
Who is responsible for updating the model when hidden conditions are discovered?
The contract and BEP should name the responsible discipline or contractor, the trigger for an update, and the approval route. They should also state whether the discovery changes the record model, the design model, the issue set, or all three.
Should point clouds be handed over with the BIM model?
If the existing-condition model depends on scans, retaining the source point cloud and its registration or coordinate information can make the record traceable and reusable. Whether it is required, and in which format, is an owner and project requirement rather than a universal rule.
How early should a renovation team set BIM deliverables?
Set the information requirements before appointing the delivery team when possible, because minimum detail, survey evidence and software capability can affect scope and fees. The team can then develop the detailed BEP, matrix and validation steps at project start.
