OpenConstructionERP
OpenConstructionERP: A free, open-source estimating platform with unusually broad takeoff, modeling, and tendering coverage. Ranked #1 of 29 in Construction Estimating Software by our editors (9.4/10); pricing: Free plan; best for open-source teams needing full estimating depth.
At a glance
- Editor score9.4 / 10
- PricingFree plan
- Best forOpen-source teams needing full estimating depth
- Free planYes
- Paid fromFree
- Digital takeoffYes
- Facts checked22 Sep 2026
Where it wins
- BOQ, cost databases, assemblies, and hierarchical estimate management
- CAD/BIM and PDF takeoff across major construction file formats
- Free AGPL-3.0 model with web, desktop, API, and self-hosted options
Where it doesn't
- Accounting integrations are not included
- The broad feature set may exceed the needs of simple estimating teams
- AI-assisted workflows require connections to external LLM providers
Our verdict on OpenConstructionERP
OpenConstructionERP is an open-source, self-hosted construction ERP for companies managing estimating and project workflows. Its core scope covers bills of quantities, hierarchical cost estimates, construction cost databases, resource catalogs, reusable assemblies, quantity takeoff, scheduling, cost modeling, tendering, validation, reporting, and exports. Teams can access it through the web, Windows, macOS, Linux, a REST API, or a self-hosted installation. It suits open-source teams that need more than a basic bid calculator and want estimating connected to broader construction processes.
The published pricing model is free forever under the AGPL-3.0 license, with no subscriptions or per-seat fees. That makes the product particularly relevant for organizations able to manage their own deployment and workflows. Its estimating depth extends from reusable cost recipes and labor or material resources to CAD/BIM takeoff for RVT, IFC, DWG, and DGN files, plus PDF measurement. AI-assisted BOQ generation and cost matching can connect with Anthropic, OpenAI, Gemini, Mistral, Groq, and DeepSeek. Exports to Excel, CSV, PDF, and GAEB XML support handoff and reporting.
OpenConstructionERP stands out when estimating must connect with scheduling, cost modeling, and tender preparation. Its 4D scheduling, 5D cost modeling, validation rules, and REST API give technically capable teams room to shape a wider estimating workflow. The trade-off is scope: a small contractor seeking only straightforward takeoff and bid preparation may find the ERP breadth unnecessary. Teams that depend on accounting integrations should choose another product. For open-source organizations that want extensive estimating and takeoff capabilities without subscription or per-seat fees, OpenConstructionERP is a strong fit.
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OpenConstructionERP pricing
OpenConstructionERP fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Digital takeoff | Yes |
| Assembly library | Yes |
| Labor and material costs | Yes |
| Bid management | Yes |
| Accounting integrations | No |
| Estimate limit | Not verified |
| Platform | Hybrid |
| Deployment | Self-hosted, Desktop |
| Platforms | Web, Windows, macOS, Linux |
| Support | Email, Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 6 integrations: Anthropic, OpenAI, Gemini, Mistral, Groq, DeepSeek |
| Pricing | Free plan |
| Website | openconstructionerp.com |
| Facts checked | 22 Sep 2026 |
OpenConstructionERP integrations
OpenConstructionERP lists 6 integrations on its own site.
- Anthropic
- OpenAI
- Gemini
- Mistral
- Groq
- DeepSeek
Alternatives to OpenConstructionERP
- BidwrightA free, open-source workspace for detailed takeoff, estimating, review, and bid delivery.9.3
- BuildxactA broad construction workflow platform with a free plan and a high paid entry price.9.1
- STACKSTACK combines digital takeoff, estimating, AI tools, and construction integrations.9.0
See all OpenConstructionERP alternatives →
OpenConstructionERP vs the competition
- OpenConstructionERP vs Bidwright
- OpenConstructionERP vs Buildxact
- OpenConstructionERP vs STACK
- OpenConstructionERP vs Trimble Accubid Anywhere
- OpenConstructionERP vs Sage Estimating
- OpenConstructionERP vs RIB CostX
Compare OpenConstructionERP with any tool side by side →
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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used OpenConstructionERP for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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