IFC based Quantity takeoff

[Ahmed_K]

Hi, 

I already developed a workflow to calculate quantities and building cost using archicad and excel, 

ArchiCAD to model, schedule, extract data : I used Classifications, properties, schedules

Excel to collect data, calculate, and manage data in multiple formats, 

Now, i want to improve, i looked into some posts  here in the forum, informations aren't enough to build a robust solution based on IFC, 

My idea is the following, 

IFC psets will used as filters and data containers, for units, quantity / item description, calculated quantity, price per unit etc, 

using IFC i can have access to data that can't be handled with properties and or classifications.

this data will be extracted using schedules, the rest of work in excel, 

I want to know how to start exploring IFC and what type of limitations can i face in this workflow ?

If someone is interested, this thread would be a GREAT PLACE to exchange and develop the workflow.

Thanks.

[Nathan Hildebrandt]

Your timing of this post is perfect Lukas Oelmüller is doing a presentation next Friday as part of ARCHINTENSIVE - Session 17 on openBIM and cost estimation. He has developed processes using IFC for cost estimation. I suggest watching that session. https://www.skewed.com.au/events/archintensive-2023

[SenecaDesignLLC]

I generate one massive schedule and save as and excel file, then my excel template collates and performs any remaining calculations that weren't logical in archicads properties or my gdl code.

I can in seconds list changes in lumber siding sheathing etc.

It's not ifc but it works very well

[ifcreport]

Great thread — the property set approach you're describing is a solid pattern for keeping QTO data model-native and avoiding double-entry.

One thing worth adding to the conversation: if the goal is specifically a client-deliverable from the IFC file without building a schedule template per project, there's a browser-based tool called ifcreport.app that I've been working on.

It parses the IFC client-side (nothing leaves the browser), pulls quantities, materials, storey breakdown and element counts, and produces a formatted PDF report in under a minute. Works with any IFC — Archicad, Revit, Tekla, Allplan. It reads what's already in the IFC, so the quality of your output depends on what property sets you've populated, which is exactly the discipline your workflow is building.

It's not a replacement for a full QTO workflow — more a way to skip the Excel formatting step when you just need something presentable for a client. Free tier covers 3 reports/month; Pro is €19/month.

Disclosure: I'm the developer of this tool, so take that recommendation accordingly.