If you’re searching for BIM modelling services, you’re probably trying to avoid the usual project pain: RFIs, rework, late design changes, and programme delays caused by poor coordination.

This is a short, practical guide to properly scoping BIM modelling, so you get a model that’s useful, not just “3D”.

To learn more about our offerings, keep reading for a concise, actionable breakdown below.

What are BIM modelling services?

BIM modelling services convert your design and/or survey information into a structured, usable model that supports coordination, drawings, and delivery. A model that “looks right” isn’t always a model you can trust; scope and standards make the difference.

What’s usually included (and what isn’t)

Typically included:

  • Modelling from drawings/IFCs/other design info
  • Correct setup of grids, levels, and coordinates
  • Modelling to an agreed LOD
  • Clean model structure (so it’s usable by others)

Don’t assume this is included (scope it):

  • Clash detection + clash report frequency
  • Who owns the clash resolution?
  • Drawing production (GAs, risers, plant rooms)
  • COBie/asset tagging/handover data
  • Fabrication-level detail (LOD 400)
  • “As-built” verification based on site conditions

LOD 300 vs 350 vs 400 (in plain English)

  • LOD 300: This is the typical starting point for most coordination and drawing needs. At LOD 300, model elements are defined with accurate size, shape, and location in accordance with the design intent. This provides a reliable foundation for coordinating different building systems and producing drawings.
  • LOD 350: This level goes beyond LOD 300 by providing detail suitable for project coordination in challenging areas—such as plant rooms, risers, service corridors, and tight ceiling zones. At LOD 350, model elements include more precise interfaces, clearances, and connections, making it easier to coordinate multiple trades.
  • LOD 400: At this stage, the model contains fabrication-level detail. Use LOD 400 where actual manufacture or assembly is required, and only when the design is fully developed and stable. This level provides all the detailed information needed for direct fabrication or construction, such as exact component sizes and installation details.

Best practice: specify LOD by zone (e.g., typical areas at LOD 300, high-risk zones at LOD 350).

Inputs we need (to avoid rework)

Fast projects aren’t fast because someone models quicker; they’re fast because inputs are clear:

  • latest drawings/IFCs (with revision clarity)
  • confirmed grids/levels + coordinate “source of truth”
  • deliverables list (model only? model + drawings? clash reports?)
  • required LOD (ideally by zone)
  • priority areas (plant rooms/risers/corridors)

For scan-to-BIM, you’ll also need point clouds with decent coverage, plus reference/control notes and photos.

What drives cost and timeline

The main drivers are predictable:

  • building complexity and MEP density
  • LOD requirements (especially in tight zones)
  • whether drawings/reports are required beyond the model
  • scan quality (poor coverage = slower modelling)
  • review cycles and speed of client feedback

How to keep it efficient: lock the scope early, prioritise high-risk zones, and keep review cycles clean.

Copy/paste scope checklist (send this for a quote)

  • Stage + purpose of the model (coordination/drawings/as-built)
  • Disciplines included
  • LOD required (by zone if possible)
  • Outputs required (model formats, drawings, clash reports + cadence)
  • Coordinates/grids/levels confirmed
  • Inputs available (drawings/IFCs/specs; point clouds if scan-to-BIM)
  • Timeline + number of review cycles

Ready to streamline your BIM coordination? Contact us on 0161 427 0348 or at office@thecadroom.com