Typical refinancing costs: discharge fee from your current lender ($150–$400), new lender application/setup fee ($0–$700, often waived), government mortgage registration fees (~$120–$200). Paddy’s broker service is free to you — paid by the new lender. Paddy calculates the exact payback period (how long it takes for monthly savings to cover switching costs) before recommending a refinance, so you know the real numbers before deciding.