Challenge
The sales team prepared offers by hand, as plain text, and did not know whether the client had opened them at all. Defects reported after handover need a response within the statutory 14 days, and the only reminder was a calendar. Complaints arrived by email and many of them concerned ordinary wear and use, which tied up the team.
A client buying a flat saw only the floor plan. Commissioning a visualisation of every interior separately would have cost a lot and taken weeks, and the offer included 199 flats across three developments.
Approach
All tools read flat data live from the developer’s content system, so a price or status changes in one place. An offer is produced as a PDF and an online page with open tracking and an interest button, and each one enters a funnel: sent, opened, interested, reservation, sold.
For complaints we deliberately added a controlled entry threshold. A short phone line collects consents and the category, filters out wear-and-use cases and sends an SMS with a link to a form with a checklist and photos. We decided to generate the 360° walkthroughs from code: scenes are created automatically from the flat records, and rendering runs in a GPU cloud.
Implementation
The defects dashboard sends reminders 7 and 2 days before the deadline and after it has passed, each exactly once. The defects and complaints dashboards share a login and a task board with change history. The phone line runs on conversation state stored in the database and verifies the signature of every call from the carrier.
The walkthroughs use high-resolution panoramas in AVIF (4 panoramas take 2.2 MB instead of 6.5 MB in JPEG), a kiosk mode with a QR code for trade fairs and buttons on the developer’s website. The build blocks publication if the area on the floor plan does not match the flat record. We checked 308 labels this way.
Results
81 of 82 flats have their own walkthrough. One sold unit with a unique floor plan is missing. The 37 scenes came from 21 floor plan families, 13 variants and 3 additional scenes. Units with the same layout use reference panoramas.
Render optimisation reduced the cost of a scene from about 2.50 to about 1.35 USD. The engine now works outside this project: a new scene takes about 24 minutes of machine time for about 1 USD. The walkthroughs were ready before the housing trade fair in October 2026.
