OpenConstructionERP

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

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Table of Contents

Getting Started Why OpenConstructionERP? Quick Start Demo Accounts	Core Modules BOQ Management Cost Databases & Catalog CAD/BIM & AI Estimation	Planning & Delivery 4D Scheduling & 5D Cost Tendering, Risk & Reports Requirements & Quality
Field Tools PDF Markups & Annotations Punch List Validation Engine	Standards & Regions 20 Regional Standards Guided Onboarding Key Features Overview	Technical Tech Stack Architecture Security

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Why OpenConstructionERP?

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).

How It Compares

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	✖	✖	✖
Real-time collaboration	✔ soft locks + presence	✔	✖	✖	✖
Open data export	✔ GAEB, Excel, CSV, JSON, PDF	⚠ limited	⚠ limited	⚠ limited	PDF only
BIM requirements (IDS/COBie)	✔ import + export	✖	✖	✖	✖

_{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.}

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See It In Action

🎬 Full Workflow From upload to estimate — complete demo	📸 AI Photo → Estimate Upload a construction photo, get a BOQ in seconds
🏗️ BIM → BOQ Takeoff Import IFC/RVT, auto-extract quantities to BOQ	📐 PDF Takeoff Measure directly on PDF drawings
🔍 55K+ Cost Items Find any cost item across 11 regional databases	⚡ Build BOQ in 60 Seconds Keyboard-first editor with inline cost lookup

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Complete Estimation Workflow

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    │
                                                         └────────────┘

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⭐ 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.

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Key Features

📊 Bill of Quantities (BOQ) Management

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)

🗄️ Cost Databases & Resource Catalog

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

🏗️ CAD/BIM Takeoff & AI Estimation

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
• Linked geometry preview — Click the BIM link badge on any BOQ position to see a 3D preview of linked elements with interactive rotate/zoom/pan controls
• BIM Quantity Picker — Select quantities (area, volume, length) directly from linked BIM elements and apply them to BOQ positions. The source parameter name is shown next to the unit
• DWG polyline measurement — Click any polyline in the DWG viewer to instantly see area, perimeter, and individual segment lengths with on-canvas labels
• 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

📅 4D Scheduling & 5D Cost Model

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

📋 Tendering, Risk & Reporting

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

📝 Requirements & Quality Gates

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

✏️ PDF Markups & Annotations

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)

✅ Punch List

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)

🌍 20 Regional Standards

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

🛡️ Validation & Compliance Engine

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

🚀 Guided Onboarding

Get productive in under 10 minutes:

1. Choose language — Select from 21 languages. The entire UI switches instantly
2. Select region — Determines default cost database, currency, and classification standard
3. Load cost database — One-click import of CWICR pricing data for your region (55,000+ items)
4. Import resource catalog — Materials, labor, equipment, and pre-built assemblies
5. Configure AI (optional) — Enter an API key from any supported LLM provider
6. Create your first project — Set name, region, standard, and start estimating

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Quick Start

Fastest: One-Line Install

# 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 | iex

Auto-detects Docker / Python / uv → installs and runs at http://localhost:8080

Option 1: Docker (recommended)

git clone https://github.com/datadrivenconstruction/OpenConstructionERP.git
cd OpenConstructionERP
make quickstart

Open http://localhost:8080 — builds everything in ~2 minutes.

Option 2: Local Development (no Docker)

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 dev

Open http://localhost:5173 — requires Python 3.12+ and Node.js 20+. Uses SQLite by default — zero configuration needed.

Option 3: pip install (full app — backend + frontend)

pip install openconstructionerp
openconstructionerp serve --open

One 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).

Demo Accounts

Three demo accounts are created automatically on first start:

Account	Email	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.

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Tech Stack

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

Architecture

┌──────────────────────────────────────────────────┐
│  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)                   │
└──────────────────────────────────────────────────┘

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Support the Project

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

Security

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).

License

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.

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Data Driven Construction — open-source tools for the global construction industry.

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_{OpenConstructionERP v1.7.0 · AGPL-3.0 · Python 3.12+ · Node 20+}