SaaS ideas your next customers are already looking for
100 SaaS startup ideas for the people who said they'd pay, from agency owners to dentists. Micro SaaS ideas, AI SaaS ideas and B2B SaaS ideas: find yours, build it, sign them up.
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Pain points in business: what people struggle with
Search the problems to solve, as people described them on Reddit and other platforms, in their own words.
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Subcontractor Insurance and Lien Waiver Checker
Checks insurance, license and lien waiver before you pay each subcontractor.
Small builders track each sub's insurance, license, W-9 and lien waiver in Drive and email. This tool checks all four before each payment.
The evidence
Score: 32 out of 100
- No opening found
- 37 pay or would pay
- 379 people describe it
- 56% hit it at least weekly
- 31.6K upvotes on their posts
No small contractor asked for it; off-form lien waivers in 12 states create legal liability, and SubDoc costs $20.
In their words
I'm tracking which subcontractors have current insurance, which licenses are about to expire, and who's waiting on a payment, all across three different spreadsheets and a messy inbox.
Chasing down subcontractors for updated insurance certificates every few months. They expire at different times, half of them ignore emails, and I end up with a folder of PDFs where half are outdated.
a GC is trying to argue over a clerical error on a lien waiver from our January pay app…. January… that they’re just now looking at.
The tools that already cover it
- SubDoc: AI reads standard insurance certificates, tracks W-9 and licenses, sends expiry alerts. Its 'payment hold' is a QuickBooks or Sage file export. No lien waivers seen. Founder-led, 49 blog posts, active on Reddit.
- Certificial: Insurance certificates only. No lien waiver, W-9, license or payment gate on its site.
- Billy: Its own site lists insurance, W-9, license, lien waivers and payment gating, with Procore sync. Sales-led, aimed at mid-size builders.
- Levelset (Procore): State templates and waiver collection before payment for builders. No insurance checks seen.
- Procore: SubDoc's guide says its compliance module needs manual entry of insurance data and a full Procore license.
- TrustLayer: Tracks insurance, W-9s and licenses and pitches 'compliance before payment'. Sales-led. No lien waivers on its site.
- Knowify: Job-costing suite. Pricing page shows no lien waiver or sub compliance feature.
- Contractor Foreman and JobTread: Small builders pay for whole-business suites, not point tools. No lien waiver or sub compliance feature on either pricing page.
How it was challenged
- Demand is vendor-made: 8 of 11 sub-compliance posts come from SubDoc and CrewSafety founders, tool builders or a brand account; 55 at least weekly pains are mostly generic admin.
- The 'adjacent tools people pay for' proof is hollow: CrewSafety's 3 mentions are its own founder promoting it, and the $1 500 a month Procore figure is second-hand from a vendor.
- SubDoc is free for 3 vendors and $20 for 100; its own guide tells builders with 1 to 20 subs to use free tools, so $99 is hard to sell.
- Wrong waiver forms are legally weak: statutes in 12 states invalidate off-form waivers, so one bad template could leave a customer exposed to a sub's lien and double payment.
- Billy already sells the exact bundle (insurance, W-9, license, lien waivers, payment gating) to mid-size builders; SubDoc needs only a waiver feature to close the gap.
The pain point it solves: Subcontractor Compliance Gaps
General contractors struggle to manually track subcontractor insurance, licenses, certifications, and compliance documents, risking expired credentials, blocked payments, and audit failures.
General contractors
Where they talk
- r/GeneralContractor
- r/Construction
- r/ConstructionManagers
- r/Contractor
- r/govcon
- r/SafetyProfessionals
- r/estimators
- r/Businessowners
Tools they use today
- Excel
- Procore
- ISNetworld
- Avetta
- Google Sheets
- SharePoint
- ACME
Why those fall short
- Bank already has transaction records but still demands per-contractor proof
- fees are expensive and hit-or-miss for irregular small jobs
- contractors lack skills, high turnover, drown internal resources
- read-only access blocks downloads into takeoff software; VDI installs fail for subs and suppliers
- no data on revenue timelines or flowdown tracking
Map of ideas
Drawing the map…





