# Custom Construction & Installation Software – No Per-Seat Fees > Digital work orders, on-site signatures, material calculation, and instant ERP sync for Dutch contractors and installers. 100% software ownership. Source: [https://aergent.nl/en/construction-installation-software](https://aergent.nl/en/construction-installation-software) Language: English Contractors & Installers • Zero Per-User SaaS Taxes # Software for Installers & Contractors. Zero Monthly Seat Taxes. Stop paying €50+ per month for every technician in your team. We build custom digital work order apps, calculation engines, and ERP sync pipelines that you own 100% permanently. Compare Costs & Features - Full Mobile Ergonomics for Field Technicians - Direct Customer Digital Signature on Glass - Automatic Parity with Your Exact / SnelStart ERP - Zero Recurring Per-User Software Licensing 100% Source Ownership €0/seat Zero Mon-Monteur Fee 14 Days Turnkey Delivery 1-Click Exact & SnelStart Sync 01 / Economics Eliminate compounding per-technician monthly rent. // Field Service Modernization • 100% Asset // ## Generic Bouw-SaaS vs. Custom Aergent Asset Off-the-shelf field service tools charge hefty seat fees for every apprentice, subcontractor, and technician. Custom software scales forever for €0 extra. ### Installation & Construction Comparison Per-seat recurring SaaS subscription vs. permanent bespoke asset ROI Guarantee 01 / Parameter Monteur / User Growth Cost Generic Bouw SaaS €35–€85 per technician / month Aergent Bouw Asset Unlimited team access at €0 extra 02 / Parameter Werkbon Workflow Fit Generic Bouw SaaS Rigid standard fields; forces unnatural habits Aergent Bouw Asset 100% customized to your exact field workflow 03 / Parameter Offline & Field Tablet Ergonomics Generic Bouw SaaS Slow hybrid app with frequent sync crashes Aergent Bouw Asset Blazing-fast responsive PWA with instant signatures 04 / Parameter Source Code & Data Sovereignty Generic Bouw SaaS Locked inside proprietary SaaS cloud Aergent Bouw Asset 100% your asset on your balance sheet 01 // WERKBONNEN #### Digital Field Work Orders Fast mobile UI for material and hour logging with customer sign-off. 02 // CALCULATIE #### Instant Quote Calculator Replace fragile Excel estimation sheets with a hardened web calculator. 03 // FACTURATIE #### Direct ERP Accounting Sync Signed work orders instantly generate draft sales invoices in your ledger. 02 / Workflow From technician on site to settled invoice in minutes. // Automated Field Service Pipeline // ## The 3-Step Construction Workflow Designed for technicians on the road and project managers in the office. Zero double-entry of data. #### 1. Mobile Dispatch & Digital Werkbon In the Field The technician views customer details, navigates to the address, selects used parts from a barcode/dropdown catalog, and has the customer sign on glass. #### 2. Real-Time Material & Hour Reconciliation Office Automation Back-office administrators see completed jobs immediately. Pricing margins and extra hours are calculated automatically based on your tariff tables. #### 3. 1-Click Invoice Sync to Exact / SnelStart Zero Double Entry No manual copying of paper slips. The system automatically creates a sales invoice and emails the PDF work order to the client, cutting days off your payment cycle. 03 / Questions Direct answers regarding custom contractor software. // Frequently Asked Questions • Installation & Construction // ## Contractor & Installer FAQ Yes. Technicians open the work order on any smartphone or tablet, log hours and parts, take before/after photos with their camera, and have the client sign directly on screen. A signed PDF work order is generated in 1 second. [Asset Sovereignty Why you own 100% of our code →](https://aergent.nl/en/software-ownership)[Excel Modernization Upgrade calculation sheets in 10 days →](https://aergent.nl/en/excel-to-webapp) Construction & Installation Software ## Ready to ditch per-monteur software licenses? Let's discuss how a custom digital werkbonnen app and calculation engine can streamline your team.