A Reliance Letter is issued by the environmental consulting firm that prepared the Phase 1 ESA. It extends the legal right to rely on the report to a named third party (typically the buyer, the buyer’s lender, or an investor). With this letter, the third party can use the report as their own due diligence and has legal recourse against the consultant if the report contains material errors or omissions.

Canadian case law is clear: an environmental consultant’s duty of care extends only to the party that commissioned the report. If contamination is later discovered and you relied on a report without a Reliance Letter, you likely have no recourse against the consultant. Your lender will also typically refuse to accept a Phase 1 ESA as due diligence without a Reliance Letter addressed to the bank — potentially blocking financing.

Reliance Letter: $300–$500 (issued within days by the original consultant)

New Phase 1 ESA commissioned from scratch: $2,000–$5,000+, with 2–4 weeks turnaround that can delay closing.

Phase 1 ESA validity: 180 days (per standard practice). Reports over one year old typically need to be fully redone. Reports 6–12 months old may need a Phase 1 Update (~$800–$1,500).

Include this in your commercial APS: “Seller shall provide Reliance Letter(s) from the environmental consultant in favour of Buyer and Buyer’s lender within X days of acceptance.”

⚠️ Receivership sales often close “as is, where is” — the receiver may be unable or unwilling to obtain Reliance Letters. Buyers in these situations must commission their own independent Phase 1 ESA and cannot rely on any existing report.

Who Needs a Reliance Letter?