OpenConstructionERP
Open-source construction ERP with PDF and BIM takeoff, bill of quantities editing and cost databases.
Measure PDFs, read IFC, RVT and DWG, and build a bill of quantities.
OpenConstructionERP is an AGPL-3.0 construction ERP that includes takeoff and estimating. It suits estimators and small contractors who want PDF and BIM takeoff with cost databases and can supply their own LLM key for AI features.
What it is
You open drawings in the browser, measure distances and areas on a calibrated scale and count elements. CAD and BIM files (RVT, IFC, DWG) are converted into quantities, which feed a bill of quantities with cost databases and optional AI cost matching.
Who it's for
It suits estimators who want an open alternative to paid takeoff suites. The README says AI-generated estimates are preliminary and must be checked by a qualified estimator before contract or tender use.
Key features
PDF takeoff
Measure distances and areas and count elements on drawings.
CAD and BIM takeoff
Quantities from RVT, IFC and DWG files via DDC converters.
3D BIM viewer
View models and pick quantities into the bill.
Bill of quantities editor
Edit positions and link quantities.
Cost databases
Cost databases with 120,000+ items across nine bases.
AI estimate generation
AI cost matching using your own LLM provider key.
Up and running in 3 steps
Our honest verdict
What's great
- Covers both PDF and BIM takeoff in one tool.
- Desktop installers need no Python, Docker or database.
- Large cost databases are included.
- Commercial licence offered for closed-source deployments.
Where it falls short
- AI features need an API key from an LLM provider, which costs money.
- Desktop builds are unsigned, so the OS shows a warning.
- The README says AI estimates are preliminary and need expert checking.
- AGPL-3.0 requires sharing changes if you run a modified version as a service.
Pricing & license
Free under AGPL-3.0, with a commercial licence offered for closed-source deployments (price not read). AI features use your own LLM provider account.
Open remote AI-training roles
873 open remote AI-training roles, updated November 15, 2026; most pay $20–$170 an hour. Zekai lists them free; the application goes to the employer’s platform.
Alternatives
These reviewed AI tools do the same job instantly — from our scored directory.
Use it, or have us set it up
FAQ
Is OpenConstructionERP free?
Yes. The code is AGPL-3.0 and a commercial licence is offered for closed-source use; AI features need your own LLM key.
What files can it take off?
PDF drawings, plus RVT, IFC and DWG files converted by DDC converters.
Do I need Docker?
No. Desktop installers and pip are options; Docker Compose is also provided.
