How to Fax Insurance Certificates — Construction and Real Estate Coverage Documentation
A certificate of insurance, almost always issued on ACORD Form 25, summarizes the coverage a contractor or business carries and is demanded before a subcontractor sets foot on a job site, a tenant takes possession, or a real estate deal closes. General contractors and property managers prefer fax for COIs because the transmission produces a tamper-resistant delivery record that lands with the certificates department rather than getting buried in an email inbox. The timestamp carries weight: if an uninsured worker is on site and a dispute over coverage starts, proof that the GC received the COI before work began can decide who is at fault. Your broker issues the certificate directly from the insurer's system, naming the certificate holder exactly as the requesting party specifies.
How to Fax a Insurance Certificates
- 1Request the COI from your insurance broker, who will issue it directly from the insurer's certificate system — contractors should not create or modify COI documents themselves
- 2Specify to your broker exactly what additional insured endorsements, waivers of subrogation, and coverage requirements the requesting party (general contractor, property owner) requires
- 3Confirm the certificate holder's name, address, and fax number exactly as the GC or owner requires — the certificate holder information must match what the requesting party specifies
- 4Review the certificate before faxing to confirm all coverage types, limits, policy numbers, and effective dates are correctly stated and match the requirements of the contract
- 5Log in to Send FAX Mail, upload the COI, and fax to the project manager's, GC's, or property manager's designated certificates fax number
- 6Save the delivery confirmation as part of the project file — proof that the COI was received before work commenced is essential if a coverage dispute arises
Document Format
ACORD Form 25 is the standard COI format — most certificate holders require this form and will not accept other formats. The certificate holder block must include the exact legal name of the entity requiring the certificate. Policy numbers on the COI must be complete — abbreviated or truncated policy numbers complicate claims processing. The COI must show an expiration date that covers the full project period; certificates expiring mid-project must be renewed and re-faxed before expiration.
Legal Considerations
A certificate of insurance is not a policy — it is evidence that a policy exists at the time of issuance, but it does not modify policy terms or create coverage that does not exist in the underlying policy. Many states (including Texas and California) have enacted laws that prohibit issuing COIs containing misleading information or terms that exceed the actual policy coverage. Additional insured endorsements must be present in the underlying policy, not merely stated on the certificate, to provide actual coverage. Retain COIs for all project participants for the duration of the applicable statute of limitations for construction claims.
Industries That Fax This Document
What’s current · as of August 2026
Recent updates
Federal agencies still write fax into new rules and notices
The Federal Register — the daily journal of U.S. federal rulemaking — regularly publishes rules and notices that reference fax as an accepted or required submission channel for filings with agencies like the IRS, SSA, and CMS. That is why fax remains a live requirement for many official forms even as electronic portals expand.
Federal Register →
Faxing a Insurance Certificates — FAQ
Only your licensed broker or the insurer itself can issue a valid COI. Drafting or editing your own certificate is treated as insurance fraud in most states. Give your broker the additional insured endorsements, limits, and waivers the GC requires, and they will produce the ACORD Form 25 for you.
Ask your broker for a fresh COI showing the new policy period and fax it before the current certificate lapses. The delivery confirmation records the moment the GC's line received the renewed certificate, which closes off any later claim that coverage gapped between policy terms.
Pull up the Send FAX Mail delivery confirmation, which shows the exact time the GC's fax line accepted your certificate. That timestamp defeats a non-receipt claim. If the GC runs more than one fax number, confirm with their certificates desk which line they actually monitor before resending.
Choosing your fax number costs nothing. A COI runs one or two pages, so a 7-day free trial lets you send a test certificate before subscribing. A subcontractor juggling certificates across multiple GCs at once is better served by the Starter plan at $12.99 a month for 600 pages, and a busy GC tracking COIs across many projects moves up to a higher plan rather than paying per page.
Ready to fax your insurance certificates?
Upload your document and send in seconds. No fax machine needed.
7-day free trial · No credit card required