Demotek — Estimating and takeoff for demolition contractors

The problem

Demolition estimating still runs on spreadsheets and printed plans. A single bid can take a week, and the number at the bottom is only as good as the least careful cell in the sheet.

The work is genuinely hard to model: scopes overlap, crews and disposal are priced by completely different units, and every change ripples through the whole estimate.

The approach

Everything is a node in a graph. Takeoffs feed assemblies, assemblies feed crews and disposal, and the bid total is just the last node in the chain. Change a measurement and the whole estimate re-solves.

The editor is the product. It runs entirely in the browser against a typed API on Cloudflare Workers, so it is fast everywhere without a server per region.

What I built

The whole thing, end to end — the plan viewer and measurement tools, the circuit-graph estimator, the API and its permission model, and the marketing site.