Painters (Exterior), House Color Visualizer

Exterior painting companies running Google or Meta ads to a generic "free estimate" form, currently converting under 10% of leads to booked jobs. Color visualization is the single biggest objection in exterior painting, homeowners can't picture their actual house in a different color, so they procrastinate for months. Ideal for established painting companies doing 5-30 exterior jobs per month who want to close leads in 1 touchpoint instead of 3 site visits.

A homeowner enters their address. The app pulls Google Street View imagery of their house and a Google Maps satellite view, runs a vision model to detect the architectural style + estimate square footage from the footprint, then renders six photorealistic versions of their actual house painted in different curated color schemes matched to their home's architectural style. The customer scrolls through the six options Tinder-style, picks their favorite, and sees an instant quote based on actual square footage.

They book the job with a $50 deposit through Stripe. Each scheme includes specific Sherwin-Williams and Benjamin Moore paint codes so the painter knows exactly what to bring on the day.

This build is challenging because of the Street View + satellite combined approach, the 6-render parallel generation, and the fallback flow for houses without Street View imagery. Expect 15-22 minutes for the initial build, then 5-8 follow-up messages to dial in.

Likely follow-up prompts you'll need to send:

If Street View comes back with the wrong heading (showing a different house or the side of the house): "The Street View image isn't reliably capturing the front of the house. Add logic to try multiple headings (0, 90, 180, 270) and use Google Street View Image Metadata API to verify which heading actually shows a residence. Pick the heading with the highest confidence of capturing a house front."

If render generation takes more than 90 seconds: "Render generation is too slow, taking too long for 6 schemes. Make sure all 6 fal.ai image generation requests fire in PARALLEL using Promise.all in the backend function, not sequentially. Each render should be ~10-15 seconds, total time ~15-20 seconds."

If renders are changing the house architecture, roof, or surroundings: "The image generation is modifying parts of the house that should stay the same. Only the painted surfaces (body siding, trim, accent features) should change color. The architecture, roof, chimney, foundation, windows, landscaping, sky, and surroundings must remain identical to the input image.

Increase the image strength parameter to 0.9 and add explicit 'preserve architecture, roof, landscaping, sky' instructions to the Nano Banana prompt."

If color codes from the renders don't match the actual SW/BM colors: "The renders aren't accurately representing the actual SW/BM paint colors. Add the actual hex code for each paint color (look up the official hex value for each SW and BM code in the SchemeLibrary) to the prompt. The image gen model uses hex codes more reliably than color name descriptions."

If schemes don't match the house style well: "The selected schemes don't always match the detected house style. Audit the SchemeLibrary tags, each scheme should have compatible_house_styles array correctly populated. If a detected style returns fewer than 6 matching schemes, fall back to schemes tagged 'universal' or expand the match to closely related styles (e.g., 'farmhouse' can match 'craftsman' and 'cottage')."

If the Street View image is grainy or low-resolution: "Use the highest available resolution from Street View Static API (640x640 is max). If the image looks too low-resolution for good rendering, also try the satellite oblique view as an alternative source, Google Maps Static has an option for 45-degree aerial perspective which sometimes provides better facade visibility for taller houses or properties set far back from the street."

The biggest variability comes from Street View image quality. Some houses have crystal-clear imagery from 2024-2026 Google Street View passes; others have grainy 2015 footage with a tree blocking half the house. The fallback to upload is essential.

Test thoroughly with diverse addresses before demoing.