Most professional architects are worth the investment, they are very good at designing individual client requirements; personalised scope of works; a schedule of finishes and detailed specifications.
This is what we as professional builders need to allow us to provide accurate pricing in advance which minimises changes and surprises.
Architects are neither builders nor estimators. They can only give you a guide using historical prices for their designs, ONLY if the project is recent and very similar. Trust your professional builder to provide accurate pricing with backup data and alternative selections if available.