For C-36 plumbing contractors

Built for the documents a California plumber actually signs

GC lien waivers, supplier W-9s, COIs from helpers and second-tier subs, and SDSs for primers, cements, and joint compounds — reviewed in 30 seconds with C-36 risk patterns baked in.

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Where plumbers lose money on documents

  • Re-pipe and remodel waivers with mixed scope

    Long re-pipe jobs invoice in stages. Each unconditional waiver releases a fixed dollar amount — sign the wrong one and you waive next month's draw.

  • Fixture supplier W-9 mismatch

    Big fixture suppliers swap entity names mid-quarter (acquisitions, DBA changes). The W-9 on file no longer matches the invoice.

  • SDS gaps on PVC primers and ABS cements

    Solvent-cement chemicals require current SDSs in your job trailer. Old MSDS-format documents fail OSHA HazCom 2012.

The documents PaidWrite reviews for plumbers

  • ›

    California progress and final lien waivers

    Multi-draw re-pipe and remodel jobs make through-date errors common.

  • ›

    ACORD 25 COIs from helpers and tier-2 subs

    Workers comp + GL must list correct scope; additional-insured endorsement matters for completed operations.

  • ›

    IRS Form W-9 from fixture and material suppliers

    Verify EIN format and business classification before issuing 1099-NEC.

  • ›

    SDSs for PVC primer, ABS cement, pipe dope, sealants

    OSHA HazCom + Cal/OSHA require current 16-section SDSs on site.

What you get

Multi-draw waiver tracker

Compare the waiver's through-date against your last invoiced date so you don't release future work.

Tier-2 sub COI sweep

Verify every helper's certificate has GL, workers comp, and the right additional-insured form.

Supplier W-9 audit

Catch TIN format errors and entity-classification mismatches before 1099 season.

Solvent-chemical SDS audit

Confirm your binder has current SDSs for every PVC primer, cement, and joint compound on site.

Frequently asked questions

Does PaidWrite know the difference between progress and final waivers?
Yes — all four California statutory forms (§§8132 conditional progress, §8134 unconditional progress, §8136 conditional final, §8138 unconditional final) are scored against their own ruleset.
Can I track waivers across multiple jobs?
Yes — tag each scan by job and you get a per-job ledger of what you've waived.
What about Cal/OSHA SDS rules?
Cal/OSHA Title 8 §5194 mirrors federal HazCom 2012; PaidWrite surfaces state-specific deltas.

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Educational reference. PaidWrite cites California statutes but is not a substitute for a licensed attorney on binding matters. CSLB classifications referenced for context only. See Disclaimer.