Costs generally include ongoing TN filing or renewal expenses plus separate legal review for the longer-term route, which is usually priced independently since it involves different evidence and timing. Ask for an itemized estimate covering both tracks rather than a single bundled figure.
Ask for separate estimates on each track
TN renewal costs and longer-term immigration planning costs don't usually scale together, and combining them into one quote can hide which expenses are near-term versus speculative. Ask counsel to separate what's needed now, evidence for the current TN request, from what's only relevant once a longer-term filing actually starts, so spending matches the stage the plan is actually at. There is a reason to separate the estimates beyond clarity of billing.
The near-term work is bounded and predictable: a duty letter, a credential check, a consistency review. The longer-term work is speculative, may never begin, and is priced on a different basis. Bundling them tends to pull speculative spending forward into a year when nothing has been decided.
Ask counsel to quote the current request as a defined task, and to state separately what a longer-term assessment would cost and what would trigger it, so the household can approve the second only when the first has produced a reason to.