# OpenConstructionERP

> Free, open-source construction ERP you host yourself: bills of quantities and estimating, takeoff from PDF, DWG, IFC and Revit files, scheduling, tenders, change orders and RFIs. AI estimating is optional and can point at your own self-hosted model, and there's an MCP server module for AI agents. Also ships a free desktop app for Windows, macOS and Linux. Built by DataDrivenConstruction in Europe: its built-in cost bases are European and other non-US regions (no US national cost base listed), though CSI MasterFormat is supported. AGPL-3.0, so changes you keep private and distribute or serve can trigger license obligations.

- **Category:** Estimating & Takeoff
- **Official site:** https://openconstructionerp.com
- **Pricing (summary; confirm on vendor site):** Free, open source (AGPL-3.0) to self-host. Optional commercial licence 1,800 EUR one-time, OEM licence 3,200 EUR one-time (maximum list prices; hosting, support and implementation also sold)
- **Pricing source:** https://openconstructionerp.com/pricing
- **Free / DIY path:** Free desktop app, or `pip install openconstructionerp` / `docker compose up` on your own machine
- **Link last checked:** 2026-11-04
- **HTML page:** https://contractoraishop.com/tools/openconstructionerp

Pricing notes are summaries. Confirm current pricing on the vendor's site.
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