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A narrow long-context reviewer scoped to proposal writing alone — no platform, no migration, no six-month rollout. Aimed at construction estimators, proving value before anyone signs anything.
In short: Proposal Builder for Construction Estimators is a long-context reviewer aimed at construction estimators, covering proposal writing. It scores 83/100 on AltF Ideas, carried by timing (93) and held back by feasibility (75). Typical pricing is $1.2k–$24k per customer per year, with a first version reachable in about a month for $5.5k–$13k.
Construction teams lose proposals rebuilt from scratch that are 80% identical. The work sits between two systems that were never designed to talk. The error rate is tolerated because measuring it would cost more than the errors.
Proposal writing handled by a long-context reviewer, with a human signing rather than writing. Revenue is seat saas, which suits a buyer who wants the cost to track the value rather than the seat count.
| Total addressable market | $488M |
|---|---|
| Category growth (CAGR) | 21% |
| Annual contract value | $1.2k – $24k |
| Pricing model | Seat SaaS |
| Time to first revenue | 40 days |
| Startup cost to MVP | $5.5k – $13k |
| Build effort | ~1 month |
Million-token context windows made whole-document reasoning possible in one pass. Construction is growing at roughly 20% a year, and this job has not been re-tooled since it was designed around paper.
| Who | The gap |
|---|---|
| The incumbent suite | Sells a platform; this job is one neglected module inside it |
| An internal hire | Works until volume doubles, then breaks again |
| An offshore back office | Cheaper per hour, but does not scale down to the tail |
The buying cycle is slower than the build, so runway assumptions matter more than code.
An idea you cannot act on is entertainment. Four concrete steps, wired to tools already running on AltFTool.
Score problem urgency, willingness to pay, and reachable audience size before writing any code.
→ AltF IdeaLabAsk how they handle this today and what it costs them. If nobody can quantify the pain, the demand score is optimistic.
→ Survey BuilderCheck availability, DNS, and email authentication in one pass so your first outreach lands in an inbox.
→ AltF DomainOpsStand up intake, the review queue, and billing before you build the clever part.
→ AltF Flow