Build a home renovation cost estimator web app with these features: 1. Project intake: the homeowner describes the renovation in plain language (kitchen gut remodel, 10x12, mid-grade, Chicago suburbs) and the AI normalizes it into project type, dimensions, finish level, and structural scope. 2. Cost database layer: seed with published regional cost-per-square-foot and unit-cost data (RSMeans-style ranges) across metros, with an admin panel to upload updated figures and cite sources. 3. Line-item estimate: labor, materials, permits, disposal, and 10 to 20 percent contingency, each shown as a low, likely, and high range with the assumptions behind each number visible. 4. Scope clarifier: the AI asks up to five follow-up questions that most move the number (load-bearing wall, electrical panel age, asbestos era) before finalizing. 5. Room-specific presets: kitchen, bathroom, basement, roof, ADU, with fixture counts adjustable item by item. 6. Budget tracker: log actual quotes and spend against the estimate, with variance alerts when a category runs 15 percent over. 7. Contractor prep sheet: a one-page PDF with the scope, line-item budget, and 10 interview questions to hand to bidders so quotes are comparable. 8. What-ifs: swap finish levels or toggle DIY for paint and demo and see the range update instantly. 9. Save-and-compare across multiple projects. 10. Email the full estimate as a branded PDF, and clearly label every number as an estimate range, not a quote.