The problem
Homeowners want a remodel preview and a ballpark price in seconds. Contractors take days to produce one. That gap is where most remodel leads die. The estimate is the bottleneck — and the bottleneck is mostly visual reasoning a phone can already do.
The product
Open the app. Point at the room. ProEstimate detects the room type, identifies the surfaces and fixtures it can reasonably touch, and produces a render of the proposed remodel plus a line-itemed cost estimate. Every estimate links back to verifiable items priced from regional contractor data.
How it works
- Capture. The user takes a photo of the room they want to remodel.
- Generation. The photo, a target style, and a budget tier go to Google's Nano Banana image model via the Gemini API, which returns a remodel render of the same room.
- Estimation. The detected scope of work feeds a pricing model with regional labor and material adjustments.
- Delivery. A shareable preview with the before/after, line-item costs, and a follow-up path to a contractor in the area.
The hard parts
Two were genuinely hard: (1) getting Nano Banana to render a remodel of this room — not a stock kitchen — which is mostly prompt engineering and reference framing; and (2) producing estimates that hold up against a real contractor quote, which involves regional pricing tables and tight scope boundaries.
Stack
- iOS: SwiftUI, native camera capture.
- Image generation: Google Gemini API — Nano Banana model.
- Backend: lightweight Python service in front of the model and the pricing tables.
- Distribution: App Store, with RevenueCat for the subscription tiers.
Status
ProEstimate is shipping on the App Store. Contractor partnerships are being added market by market.