You Were Hired to Deliver BIM. Revit Alone Won’t Get You There.

BIM, or Building Information Modeling, refers to a tech-enabled design process that integrates and syncs information-rich, 3D models with multi-disciplinary designs and accurate calculations. Achieving BIM across a design team or on a specific project can confer enormous benefits to efficiency, accuracy, and coordination.

That’s what BIM is supposed to deliver. That’s why your role exists. And yet, if you’re being honest, the workflow isn’t there yet. Autodesk’s Revit, the flagship BIM platform, generates beautiful models, but the engineers are frustrated by persistent calculation errors nobody has caught. Project scope changes still trigger weeks of rework.

For MEP engineers in particular, Revit alone cannot help you accomplish robust BIM and enjoy its benefits. On its own, Revit presents engineers with major workflow challenges that yield errors, delays, and disconnects between different teams on a design project. To better understand this, it’s important to consider the history of Revit and the workflows it produces, before turning to new solutions that you can adopt to work alongside Revit to move your firm toward a genuinely data-rich, information-connected workflow.

Why Revit Exists — and Why It’s the Root of the Problem

In 1997, architects were facing a stubborn workflow challenge. Their clients were increasingly wanting to change designs after they were completed, and this meant completing extensive manual updates to every drawing. If, for example, a client wanted to add a window to a room, architects had to both accommodate the work of redesigning the room and take care to prevent contractors and other downstream stakeholders from working from older or conflicting drawings, including floor plans, schedules, and elevations.

Charles River Software responded to these revision workflow challenges with their new program, Revit – short for “Revise Instantly.” The concept behind Revit was to efficiently capture architectural changes and “cascade” them automatically across all connected drawings. Revit has gone on to transform the work that architects do, but now MEP engineers are facing the same workflow challenges that architects had before Revit was created.

When architects make revisions to their drawings, the layout changes. For the MEP team, that means their layouts, calculations, designs, and reports are now out of sync. Because Revit made architectural changes so efficient and easy to accomplish, project workflows began to accommodate more and more design changes, and this compounded the volume of revision work that MEPs had to undertake in order to stay up to date. MEP engineers were left having to keep up with the pace of changes, a problem that has only grown more extensive as firms increasingly adopt Revit across all teams.

Revit Serves an Architecture Workflow that Undermines MEP Calculations

In terms of BIM, Revit delivers high-quality building modeling, but its information capabilities – including calculations, sizing, and compliance – are underdeveloped and not optimal for MEP engineers.

Revit was built to connect the architectural workflow: layouts, elevations, sections, and schedules. That foundation is solid, and it serves architects brilliantly. But the MEP engineering workflow is fundamentally different because it is built on calculations, which often have to be done outside of Revit on a spreadsheet or using a Python script, or via a custom plugin.

Here’s what I’ve seen after fifteen years in this industry and from speaking with thousands of engineering companies: Before you can size a single pipe or duct, calculations must be completed for flow rates, velocities, pressure drops, pump duties, recirculation balancing, fan duties, and heat loads. These extensive mechanical calculations are the foundation of MEP engineering, and Revit cannot run them natively. Every attempt to bolt them on makes Revit slower, heavier, and more crash-prone.

The MEP Design Workflow You’re Trying to Replace

The traditional MEP engineering workflow in Revit typically involves these five manual steps:

1. Draw: sketch the layout in a tool (often slow and clunky) for early-stage design thinking
2. Count and measure: manually extract quantities and dimensions from the model to feed the calculations
3. Spreadsheet calculations: size the system components, check pressures, and verify heat loads. This is often a time-consuming, tedious, and entirely manual process with a high potential for introducing errors into the project.
4. Update sizes in Revit: take everything you just calculated and manually update the model.
5. Coordinate: clash detection, trade coordination, review rounds.

From there, the workflow either cycles through small changes as they are introduced, or it goes back to step one to accommodate a big change. This process is slow, and carries a high risk of human errors at every transfer point. To try to address these issues, teams have tried to complete more of the workflow directly in Revit, by investing in plugins and more extensive user training. Ultimately, though, the MEP spreadsheet calculations that add the most time to the workflow are still happening outside of Revit.

True BIM would mean all five workflow steps are connected and big changes could be cascaded through an already-connected system. To achieve this, firms need a purpose-built engineering environment that handles steps one through four and then feeds verified, correctly-sized data into Revit at step five, where Revit actually excels.

Revit is the right tool, but only at the right stage in the workflow.

The Path Forward: Outside Revit, Not Deeper Into It

The firms getting closest to true BIM delivery are the ones who’ve accepted that Revit is a coordination and drawing production tool, and have stopped asking it to also be an engineering environment.

The workflow that actually delivers BIM for MEP engineers:

1. Design & Analysis: Sketch, explore options, and iterate in a tool built for engineering thinking.
2. Calculations & Compliance: Automatic, accurate, and tied directly to the layout (no spreadsheets needed!)
3. Design Reviews: Design and calculations in one place, so reviewers can see both together.
4. Architect Revisions & Rework: Layout changes update the calculations automatically — big changes no longer send you back to step one.
5. Revit: Receives verified, sized, accurate data for coordination and drawing production.

This workflow ensures that critical MEP information is generated in a purpose-built environment, then connected to Revit at the right time.

h2x Complements Revit and Enhances the MEP Workflow

h2x was built to address the challenges MEP engineers face when using Revit on large, complex projects. It acts as an engineering layer that sits alongside Revit and feeds it the verified data it needs to be useful.

h2x connects the five-step loop:

1. Design & Analysis: Sketch, explore options, and iterate in a tool built for engineering thinking.
2. Calculations: Automatic, accurate, and tied directly to the layout (no spreadsheets needed!)
• Compliance: h2x follows your local standards, such as ASHRAE, CIBSE, and more as the design develops.
3. Design Reviews: Design and calculations in one place, so reviewers can see both together.
4. Architect Revisions & Rework: Layout changes update the calculations automatically — big changes no longer send you back to step one.
5. Revit: Receives verified, sized, accurate data for coordination and drawing production.

h2x users report up to a 50% reduction in overall design time by eliminating the manual reconciliation between tools that currently consumes a significant portion of every project. Bringing h2x into your firm’s workflow will enable you to truly achieve BIM standards for every project. It acts as the missing piece that connects engineering to the modeling capabilities of Revit and delivers verified designs to clients.

Revit gave architects “Revise Instantly,” and now h2x gives “Revise Instantly” to MEP engineers.

And you’re the one who makes it happen.

Ready to see how h2x connects your MEP workflow to Revit? Watch a recorded demo or book a 15-minute demo to see the full workflow in action!