3D MEP BIM coordination model showing integrated mechanical systems and structural framing for a commercial building

As-Built Modeling Services

Professional As-Built Modeling Services to create accurate BIM models from existing building conditions, construction documents, point cloud data, and site surveys.

3D As-Built BIM coordination model showing building cross-section with color-coded MEP systems, clash detection layouts, and architectural floor plan blueprints BIM service

About This Service

As-Built Modeling Services

When a project moves into renovation, retrofit, fit-out, or facility management, the question is always the same: does anyone have an accurate record of what was actually built? Drawings get revised during construction, site conditions shift, and the as-designed model rarely matches what ended up in the walls. Our as-built modeling services exist to close that gap. We take the available field information-redline markups, site photographs, point cloud data, O&M documents-and produce a Revit model that reflects installed conditions as accurately as the source data allows. The result is a reliable base for the next phase of work, whether that's a major renovation, a systems upgrade, or building handover.

What Is As-Built Modeling?

As-built modeling is the process of creating or updating a BIM model to reflect what was physically constructed, rather than what was originally designed. On most projects, there's a gap between the two. Walls shift slightly during construction. Mechanical routes get rerouted on site. Structural penetrations get added. The design drawings capture intent; the as-built model captures reality.

A practical example: a client taking over a hospital wing for refurbishment comes to us with marked-up construction drawings and a folder of site photos. The original CAD drawings are eight years old and show the pre-renovation layout. We build the as-built Revit model from the current field information, and the design team uses it to plan new MEP routes without spending days measuring on site.

Our As-Built Modeling Scope


Architectural As-Built Modeling

We model walls, partitions, doors, windows, ceilings, floors, stairs, and finishes to reflect current building conditions. Room data sheets and finish schedules with site-verified updates are incorporated into the model and associated schedules.

Structural As-Built Modeling

Columns, beams, slabs, load-bearing walls, foundations (where visible or documented), and any structural modifications made during or after construction. Where information is incomplete, we flag it rather than assume.

MEP As-Built Modeling

HVAC ductwork, pipework, cable trays, conduits, plumbing, drainage, and fire protection as installed. Hidden elements above sealed ceilings or inside chases can only be modeled if they appear in redlines or scan data. We are clear about what is modeled and what is inferred.

As-Built Modeling from Point Cloud Data

Where a laser scan has been carried out, we work from the registered point cloud to build the as-built BIM model. We check coverage and density before starting, identify gaps, and flag areas where the model is based on limited information. This scan to as-built BIM approach gives the most accurate existing conditions model when the scan is complete and well-registered.

What We Deliver

  • As-built Revit model (.rvt) built to the client's template or our standard setup
  • Floor plans, sections, and elevations reflecting installed conditions
  • Room, door, window, and finish schedules (architectural)
  • MEP as-built drawings showing installed routes and equipment locations
  • COBie data or asset schedules, if required for handover
  • DWG and PDF exports of all issued drawings
Files are issued via shared drives, Autodesk Construction Cloud, or whichever platform the client uses. We follow the client's naming conventions and folder structure where specified.

Our Workflow

  1. Review source information: We go through all available material-redlines, markups, photos, scan data, O&M documents, existing CAD or BIM files-and note what's clear, what's partial, and what's missing.
  2. Scope and accuracy agreement: We confirm which disciplines are in scope, the required LOD, and any areas where information is limited. Elements that can't be modeled reliably are agreed in advance as omitted, flagged, or approximate.
  3. BIM setup: We configure the Revit file to the client's template, set survey and project base points, and establish levels, grids, and worksets.
  4. Model development: We build the as-built model from confirmed source information, discipline by discipline. Where scan data is provided, we reference the point cloud directly in Revit using ReCap.
  5. Internal quality check: We verify the model against source material-dimensions, room names, MEP routes, drawing consistency, and schedule accuracy-before anything goes to the client.
  6. Client review and revisions: We issue for review, incorporate comments, and update with any additional site information provided at this stage.
  7. Final delivery: Deliverables are issued in the agreed formats, with a record of what each element is based on.


Level of Development (LOD)

LOD 200 covers approximate geometry-useful for early feasibility or space planning on existing buildings where precise dimensions aren't yet needed.

LOD 300 is the standard for as-built BIM modeling. Elements are modeled with accurate geometry and location, suitable for renovation design, construction documentation, and coordination. Plans, sections, and elevations can be produced directly from the model.

LOD 350 adds connections, interfaces, and clearances between systems. This level is relevant for MEP as-built modeling on retrofit projects where new plant has to fit around existing services and coordination between disciplines matters.

LOD 400 reflects fabrication-level detail and is rarely required for as-built documentation unless the model feeds directly into a follow-on fabrication scope.

On all as-built projects, accuracy is tied to the quality of the source information. We document the basis for each element modeled so the client knows what is verified, what is taken from drawings, and what is inferred from photographs.

A note on LOD 500: this refers to field-verified, asset-ready information meeting a defined FM specification. If your handover scope requires COBie data or a model built to a BEP for facilities management use, tell us at the outset—it needs to be configured from the start, not retrofitted at the end.

Software We Use

  • Autodesk Revit - primary modeling environment for all as-built BIM work
  • Autodesk ReCap - point cloud review and referencing scan data into Revit
  • AutoCAD - working with existing CAD drawings and producing DWG deliverables
  • Navisworks - federating multi-discipline as-built models and spatial review
  • Autodesk Construction Cloud - file sharing, model collaboration, and issue tracking

Why Clients Use This Service

Measuring an existing building on site takes time and money. A reliable as-built model cuts that significantly and gives design teams a Revit base they can work from directly, rather than starting from scratch or working off outdated drawings.

For renovation and retrofit projects, accurate as-built documentation means clashes between existing conditions and new systems are found in the model rather than on site. For handover, an as-built BIM model gives facilities teams something they can actually use-a record of installed conditions that supports maintenance planning and future works.

Clients also use as-built modeling to resolve disputes about what was constructed versus what was specified, or to meet lease, insurance, or regulatory requirements for building records. The common thread is that decisions made with poor building records cost more than the time taken to get the information right.

Projects We Support


  1. Renovation and refurbishment - offices, hotels, retail spaces, and residential buildings being reconfigured. The as-built model gives designers an accurate base rather than relying on outdated drawings or field measurements.
  2. Healthcare and education - hospitals, clinics, universities, and schools that have been modified multiple times. Accurate as-built documentation is particularly important where works are carried out in occupied buildings.
  3. Industrial and commercial - warehouses, data centres, and manufacturing facilities where existing MEP systems are complex and need to be understood before new plant is introduced.
  4. Retrofit and sustainability upgrades - projects targeting energy performance improvements where the design team needs existing conditions to model new systems and calculate performance accurately.

Why Work With Eminent BIM Services?

Our team handles as-built projects regularly, which means we're familiar with the practical issues: scan coverage with gaps above suspended ceilings, redlines that conflict in one corner of a drawing, MEP above ceilings that wasn't documented at handover. We know how to handle these situations-flagging discrepancies, working to the most reliable source, and making sure the client knows what the model is based on.

We work to client BIM Execution Plans, Revit templates, naming conventions, and LOD specifications. If a project has specific handover requirements or an FM data standard to meet, we configure the model from the start. We support projects in the UK, US, Middle East, Australia, and other markets, adapting to local drawing standards and delivery requirements.

Start Your As-Built Modeling Project

If you have drawings, photographs, scan data, or existing files for a building that needs to be documented in BIM, send us what's available. Our team will review the information, confirm what's achievable, and discuss the scope, LOD, and deliverables with you before work begins.
Software Used
Autodesk Revit AutoCAD Navisworks Recap Pro
FAQ
As-Built Models provide accurate documentation of existing conditions, helping project teams plan renovations, maintenance activities, facility management, and future construction work.
Redline markups, site photographs, and any existing CAD or BIM files are the most common starting point. A laser scan gives the most accurate base. Tell us what's available and we'll confirm what's achievable from it.
Yes. PDFs and photographs are a common starting point, particularly on older buildings with no digital files. Accuracy will depend on drawing quality and photo coverage. We'll confirm any limitations before starting.
LOD 300 is standard for as-built documentation. LOD 350 is available for MEP where connection and clearance detail is needed. If you have a BEP that defines the LOD requirement, share it and we'll confirm what's achievable.
Yes. We handle all three disciplines, either as separate models or as a federated multi-discipline as-built model depending on the project requirement.
We can include COBie data and asset parameters where this is a handover requirement. This needs to be agreed at the start-it's more straightforward to build in from the beginning than to add afterwards.
Yes, that's one of the most common uses. The model is set up in Revit so the design team can link it or use it as a starting point. We coordinate file setup with your team's Revit environment.
Yes. We support projects in the UK, US, Middle East, Australia, and other markets, working to local standards, BEPs, and drawing conventions as required.
We flag areas where information is incomplete or where elements couldn't be modeled with confidence, and document what each part of the model is based on. What you receive is a model you can trust, with a clear record of its basis.
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