For a resale detached home, add a home inspection, typically $400 to $600, and any adjustments for prepaid property taxes or utilities the seller is owed credit for at your possession date.
For a condo, add the cost of your lawyer reviewing the corporation's reserve fund study and budget, and confirm whether any special assessment is pending before your offer goes firm.
Ask your lawyer for a written estimate as soon as your offer is accepted, since that is the number your financing condition and your final decision should be based on, not a rule of thumb.
Get your hand-reviewed valuation from Joel Dyck.