A builder's representative has a legal duty to get the best deal for the builder, the same as a listing agent representing a seller. Your own agent has that same duty to you, reviewing the purchase agreement, the specifications and any upgrade allowances before you commit a deposit, and checking any infill permit the City of Saskatoon has on file for how the larger Montgomery Place lot is being valued in the price.
In 2026, because these are larger, older lots rather than a standard subdivision, comparable sales are harder to find, which is exactly the situation where an independent second opinion on price matters most. A builder's agent has no reason to point that out to you.
The cost to you of hiring your own agent is typically nothing extra at closing, since that cost is usually built into the deal the same way it would be on a resale home. Get your hand-reviewed valuation from Joel Dyck.