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Plumbing Business: Quotes in 8 instead of 120 Minutes
How a 14-person plumbing business from OWL tripled its quotation rate with AI.
The Challenge
- •Master craftsman spends 12–15 hours per week on quote generation
- •Inquiries sit for 3–4 days — customers go to competitors
- •Standardized bathrooms take almost as long as special cases
The Solution
- Customer form with photo upload + voice note (detailing required work)
- AI extracts room type, dimensions, existing installation
- Quotation engine combined with calculated unit/hourly rate list
- Master craftsman receives draft as PDF — reviews, adjusts 1–2 line items, sends it out
Results
| Metric | Before | After |
|---|---|---|
| Time per quote | 90–120 Min | 8–12 Min |
| Quotes per week | 8–10 | 25–30 |
| Response time to inquiries | 3–4 Days | < 4 Hours |
| Closing rate | ~28 % | ~41 % |
Stack
GPT-5 (Vision)EU-Hosting (Hetzner Falkenstein)n8n for workflow automationSupabase for data managementPDF Generator
What we learned
- →Photo quality is critical — we showed the customer example photos in the form
- →First week: Master craftsman heavily revised every quote — after 4 weeks of learning, only fine-tuning was needed
- →Important: AI must not send autonomously. Otherwise, the end customer notices standardization
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