The #1 Open-Source Construction Estimation & Project Management Software
Professional BOQ, 4D/5D planning, AI-powered estimation, CAD/BIM takeoff — all in one platform.
Demo · Documentation · Discussions · Report Bug
100% open source · 55,000+ cost items · AI estimation · 21 languages · Self-hosted
Construction cost estimation software is expensive, closed-source, and locked to specific regions. OpenConstructionERP changes that.
| What you get | How it works |
|---|---|
| Free forever | AGPL-3.0 license. No subscriptions, no per-seat fees, no vendor lock-in. |
| Your data, your server | Self-hosted. Everything runs on your machine — nothing leaves your network. |
| 21 languages | Full UI translation: English, German, French, Spanish, Portuguese, Russian, Chinese, Arabic, Hindi, Japanese, Korean, and 10 more. |
| 20 regional standards | DIN 276, NRM 1/2, CSI MasterFormat, GAEB, ГЭСН, DPGF, GB/T 50500, CPWD, and more. |
| AI-powered | Connect any LLM provider (Anthropic, OpenAI, Gemini, Mistral, Groq, DeepSeek) for smart estimation. |
| 55,000+ cost items | CWICR database with 11 regional pricing databases (DACH, UK, US, France, Spain, Brazil, Russia, UAE, China, India, Canada). |
| Capability | OpenConstructionERP | RIB iTWO | Exactal CostX | Sage Estimating | Bluebeam |
|---|---|---|---|---|---|
| License | AGPL-3.0 (free) | Proprietary | Proprietary | Proprietary | Proprietary |
| Self-hosted / offline | ✔ | ✖ | ✖ | ⚠ partial | ✖ |
| Price | Free forever | ~€500/mo | ~€300/mo | ~€200/mo | ~€30/mo |
| AI estimation | ✔ 7 LLM providers | ✖ | ✖ | ✖ | ✖ |
| UI languages | 21 | 5 | 3 | 2 | 8 |
| Regional standards | 20 | 4 | 3 | 2 | — |
| BOQ editor | ✔ | ✔ | ✔ | ✔ | ✖ |
| CAD/BIM takeoff | ✔ RVT IFC DWG DGN | ✔ | ✔ | ✖ | ✔ PDF only |
| 4D/5D planning | ✔ | ✔ | ✖ | ✖ | ✖ |
| Cost database included | ✔ 55K+ items with rates | ✖ extra cost | ✖ extra cost | ✖ extra cost | ✖ |
| Resource catalog | ✔ 7K+ with prices | ✖ extra cost | ✖ | ✖ | ✖ |
| Validation engine | ✔ 42 rules | ⚠ limited | ✖ | ✖ | ✖ |
| REST API | ✔ full access | ⚠ limited | ✖ | ✖ | ✖ |
Product names are trademarks of their respective owners. This comparison is based on publicly available information as of Q1 2026. Pricing is approximate (per-seat, list price) and may vary by region. OpenConstructionERP is not affiliated with any of the listed vendors.
OpenConstructionERP covers the full lifecycle — from first sketch to final tender submission:
Upload Convert Validate Estimate Tender
┌────────┐ ┌──────────┐ ┌───────────┐ ┌──────────┐ ┌──────────┐
│PDF/CAD │───────▶│ Extract │──────▶│ 42 rules │─────▶│BOQ Editor│─────▶│ Bid Pkgs │
│Photo │ │quantities│ │ DIN/NRM/ │ │ + AI │ │ Compare │
│Text │ │ + AI │ │ MasterFmt │ │ + Costs │ │ Award │
└────────┘ └──────────┘ └───────────┘ └──────────┘ └──────────┘
│
┌─────┴──────┐
│ 4D Schedule│
│ 5D Costs │
│ Risk Reg. │
│ Reports │
└────────────┘
⭐ If you want to see new updates and database versions and if you find our tools useful please give our repositories a star to see more similar applications for the construction industry. Star OpenConstructionERP on GitHub and be instantly notified of new releases.
Build professional cost estimates with a powerful BOQ editor:
- Hierarchical BOQ structure — Sections, positions, sub-positions with drag-and-drop reordering
- Inline editing — Click any cell to edit. Tab between fields. Undo/redo with Ctrl+Z
- Resources & assemblies — Link labor, materials, equipment to each position. Build reusable cost recipes
- Markups — Overhead, profit, VAT, contingency — configure per project or use regional defaults
- Automatic calculations — Quantity × unit rate = total. Section subtotals. Grand total with markups
- Validation — 42 built-in rules check for missing quantities, zero prices, duplicate items, and compliance with DIN 276, NRM, MasterFormat
- Export — Download as Excel, CSV, PDF report, or GAEB XML (X83)
Access the world's construction pricing data:
- CWICR database — 55,000+ cost items covering all major construction trades. Available in 9 languages with 11 regional price sets
- Smart search — Find items by description, code, or classification. AI-powered semantic search matches meaning, not just keywords ("concrete wall" finds "reinforced partition C30/37")
- Resource catalog — 7,000+ materials, equipment, labor rates, and operators. Build custom assemblies from catalog items
- Regional pricing — Automatic price adjustment based on project location. Compare rates across regions
- Import your data — Upload your own cost database from Excel, CSV, or connect via API
Extract quantities from any source — drawings, models, text, or photos:
- CAD/BIM takeoff — Upload Revit (.rvt), IFC, AutoCAD (.dwg), or MicroStation (.dgn) files. DDC converters extract elements with volumes, areas, and lengths automatically
- Interactive QTO — Choose how to group extracted data: by Category, Type, Level, Family. Format-specific presets for Revit and IFC
- PDF measurement — Open construction drawings directly in the browser. Measure distances, areas, and count elements with calibrated scale
- AI estimation — Describe your project in plain text, upload a building photo, or paste a PDF — AI generates a complete BOQ with quantities and market rates
- AI Cost Advisor — Ask questions about pricing, materials, or estimation methodology. AI answers using your cost database as context
- Cost matching — After AI generates an estimate, match each item against your CWICR database to replace AI-guessed rates with real market prices
Plan your project timeline and track costs over time:
- Gantt chart — Visual project schedule with drag-and-drop activities, dependencies (FS/FF/SS/SF), and critical path highlighting
- Auto-generate from BOQ — Create schedule activities directly from your BOQ sections with cost-proportional durations
- Earned Value Management — Track SPI, CPI, EAC, and variance. S-curve visualization shows planned vs actual progress
- Budget tracking — Set baselines, compare snapshots, run what-if scenarios
- Monte Carlo simulation — Risk-adjusted schedule analysis with probability distributions
Complete your estimation workflow:
- Tendering — Create bid packages, distribute to subcontractors, collect and compare bids with side-by-side price mirror
- Change orders — Track scope changes with cost and schedule impact analysis
- Risk register — Probability × impact matrix, mitigation strategies, risk-adjusted contingency
- Reports — Generate professional PDF reports, Excel exports, GAEB XML. 12 built-in templates
- Documents — Centralized file management with version tracking and drag-and-drop upload
Track and validate construction requirements with the EAC (Entity-Attribute-Constraint) system:
- EAC Triplets — Capture requirements as structured data: Entity (wall), Attribute (fire_rating), Constraint (≥ F90)
- 4 Quality Gates — Completeness → Consistency → Coverage → Compliance. Run sequentially to validate requirements
- BOQ Traceability — Link each requirement to BOQ positions for full traceability from spec to estimate
- Bulk Import — Import requirements from structured text (pipe-delimited format)
- Categories — Structural, fire safety, thermal, acoustic, waterproofing, electrical, mechanical, architectural
Annotate construction drawings and documents directly in the browser:
- 10 markup types — Cloud, arrow, text, rectangle, highlight, polygon, distance, area, count, stamp
- Custom stamps — Approved, Rejected, For Review, Revised, Final + create your own with logo and date
- Scale calibration — Set real-world scale per page for accurate measurements
- Markups List — Table view of all annotations with filters, search, and CSV export
- BOQ Integration — Link measurements directly to BOQ positions (quantity = measured value)
Track construction deficiencies from discovery to resolution:
- 5-stage workflow — Open → In Progress → Resolved → Verified → Closed
- Location pins — Mark exact position on PDF drawings (x/y coordinates)
- Priority levels — Low, Medium, High, Critical with color coding
- Photo attachments — Upload photos of deficiencies from the field
- Categories — Structural, mechanical, electrical, architectural, fire safety, plumbing, finishing
- PDF Export — Generate punch list reports for stakeholder review
- Verification control — Different user must verify (not the resolver)
| Standard | Region | Format |
|---|---|---|
| DIN 276 / ÖNORM / SIA | Germany / Austria / Switzerland | Excel, CSV |
| NRM 1/2 (RICS) | United Kingdom | Excel, CSV |
| CSI MasterFormat | United States / Canada | Excel, CSV |
| GAEB DA XML 3.3 | DACH region | XML |
| DPGF / DQE | France | Excel, CSV |
| ГЭСН / ФЕР | Russia / CIS | Excel, CSV |
| GB/T 50500 | China | Excel, CSV |
| CPWD / IS 1200 | India | Excel, CSV |
| Bayındırlık Birim Fiyat | Turkey | Excel, CSV |
| 積算基準 (Sekisan) | Japan | Excel, CSV |
| Computo Metrico / DEI | Italy | Excel, CSV |
| STABU / RAW | Netherlands | Excel, CSV |
| KNR / KNNR | Poland | Excel, CSV |
| 표준품셈 | South Korea | Excel, CSV |
| NS 3420 / AMA | Nordic countries | Excel, CSV |
| ÚRS / TSKP | Czech Republic / Slovakia | Excel, CSV |
| ACMM / ANZSMM | Australia / New Zealand | Excel, CSV |
| CSI / CIQS | Canada | Excel, CSV |
| FIDIC | UAE / GCC | Excel, CSV |
| PBC / Base de Precios | Spain | Excel, CSV |
Ensure your estimates meet regulatory standards before submission:
- 42 built-in rules across 13 rule sets — DIN 276, NRM, MasterFormat, GAEB, and universal BOQ quality checks
- Real-time validation — Run checks with Ctrl+Shift+V. Each position gets a pass/warning/error indicator
- Quality score — Overall BOQ quality percentage (0–100%) visible in the toolbar
- Drill-down — Click any finding to jump directly to the affected BOQ position and fix it
- Custom rules — Define project-specific validation rules via the rule builder or Python scripting
Get productive in under 10 minutes:
- Choose language — Select from 21 languages. The entire UI switches instantly
- Select region — Determines default cost database, currency, and classification standard
- Load cost database — One-click import of CWICR pricing data for your region (55,000+ items)
- Import resource catalog — Materials, labor, equipment, and pre-built assemblies
- Configure AI (optional) — Enter an API key from any supported LLM provider
- Create your first project — Set name, region, standard, and start estimating
# Linux / macOS
curl -sSL https://raw.githubusercontent.com/datadrivenconstruction/OpenConstructionERP/main/scripts/install.sh | bash
# Windows (PowerShell)
irm https://raw.githubusercontent.com/datadrivenconstruction/OpenConstructionERP/main/scripts/install.ps1 | iexAuto-detects Docker / Python / uv → installs and runs at http://localhost:8080
git clone https://github.com/datadrivenconstruction/OpenConstructionERP.git
cd OpenConstructionERP
make quickstartOpen http://localhost:8080 — builds everything in ~2 minutes.
git clone https://github.com/datadrivenconstruction/OpenConstructionERP.git
cd OpenConstructionERP
# Install dependencies
cd backend && pip install -r requirements.txt && cd ..
cd frontend && npm install && cd ..
# Start (Linux/macOS)
make dev
# Start (Windows — two terminals)
# Terminal 1: cd backend && uvicorn app.main:create_app --factory --reload --port 8000
# Terminal 2: cd frontend && npm run devOpen http://localhost:5173 — requires Python 3.12+ and Node.js 20+. Uses SQLite by default — zero configuration needed.
pip install openconstructionerp
openconstructionerp serve --openOne command installs everything. Opens browser at http://localhost:8080 with full UI. Uses SQLite — zero config. PyPI package (2.6 MB, includes pre-built frontend).
Three demo accounts are created automatically on first start:
| Account | Password | Role | |
|---|---|---|---|
| Admin | demo@openestimator.io |
DemoPass1234! |
Full access |
| Estimator | estimator@openestimator.io |
DemoPass1234! |
Estimator |
| Manager | manager@openestimator.io |
DemoPass1234! |
Manager |
Demo accounts include 5 pre-loaded projects from Berlin, London, New York, Paris, and Dubai with complete BOQs, schedules, and cost models.
| Layer | Technology | Purpose |
|---|---|---|
| Backend | Python 3.12+ / FastAPI | Async API, Pydantic v2 validation, modular architecture |
| Frontend | React 18 / TypeScript / Vite | SPA with code splitting, 21 language bundles |
| Database | PostgreSQL 16+ / SQLite (dev) | OLTP with JSON columns, zero-config SQLite for development |
| UI | Tailwind CSS / AG Grid | Professional data grid, responsive design, dark mode |
| AI | Any LLM via REST API | Anthropic, OpenAI, Gemini, Mistral, Groq, DeepSeek |
| Vector Search | LanceDB (embedded) / Qdrant | Semantic cost item search, 384d or 3072d embeddings |
| CAD/BIM | DDC cad2data | RVT, IFC, DWG, DGN → structured quantities |
| i18n | i18next + 21 language packs | Full RTL support (Arabic), locale-aware formatting |
┌──────────────────────────────────────────────────┐
│ Frontend (React SPA) │
│ TypeScript · Tailwind · AG Grid · PDF.js │
└──────────────────┬───────────────────────────────┘
│ REST API
┌──────────────────┴───────────────────────────────┐
│ Backend (FastAPI) │
│ 20 auto-discovered modules · Plugin system │
├──────────────────────────────────────────────────┤
│ BOQ · Costs · Schedule · 5D · Validation · AI │
│ Takeoff · Tendering · Risk · Reports · Catalog │
│ Requirements · Markups · Punch List │
├──────────────────────────────────────────────────┤
│ Database (PostgreSQL / SQLite) │
│ Vector DB (LanceDB / Qdrant) │
│ CAD Converters (DDC cad2data) │
└──────────────────────────────────────────────────┘
OpenConstructionERP is built and maintained by the community. If you find it useful:
- ⭐ Star this repo — helps others discover the project
- 💬 Join Discussions — ask questions, share ideas, help others
- 🐛 Report issues — help us improve
- 💼 Professional consulting — custom deployment, training, enterprise support
OpenConstructionERP includes security hardening for production deployments:
- Path traversal protection on all file download endpoints
- CORS wildcard blocking in production mode
- Bounded input validation on bulk price operations
- Generic error responses to prevent account enumeration
- Production startup checks for secrets, credentials, and database configuration
Report vulnerabilities via GitHub Issues (private reports supported).
We welcome contributions! See CONTRIBUTING.md for development guidelines, code style, and PR process.
AGPL-3.0 — see LICENSE.
You can freely use, modify, and distribute this software. If you modify and deploy it as a service, you must make your source code available under the same license.
For commercial licensing without AGPL obligations, contact info@datadrivenconstruction.io.
Created by Artem Boiko · Data Driven Construction
Building open-source tools for the global construction industry.
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