Remortgaging in the UK: When Is It Worth It?

Remortgaging is typically worth it when the total savings from a lower rate exceed the total costs of switching over the period you expect to keep the new deal. Costs can include product fees, broker fees, valuation costs, legal fees, and any early repayment charge on the existing mortgage.

People often overestimate savings by comparing only the headline rate without considering fees, or by assuming they will keep a deal for longer than they realistically will. A practical way to avoid this is to decide the comparison horizon first, then compare costs and savings over that horizon.

1) Estimate the monthly payment difference

Compare your current rate/payment to the estimated payment under a new deal for the same balance and remaining term, if that is your plan. Mortgage amortisation can make precise numbers complex, but a rough monthly difference is useful for break-even thinking.

2) Multiply over your realistic horizon

Decide how long you expect to keep the new deal (for example, until the next fix ends). Multiply the monthly saving by the number of months.

3) Subtract costs

Add product fees and any switching costs. If an ERC applies, include it. If savings do not exceed costs by a comfortable margin, switching may not be worth it.

This is not a perfect model, but it prevents the common mistake of focusing on rate alone. The closer the decision is, the more important it becomes to use more precise figures and confirm costs.

Many households review remortgage options before their fixed period ends, because moving onto a lender’s revert rate can increase costs. The right timing depends on lender rules, the mortgage product, and whether switching early triggers an ERC.

If your current deal has an ERC, your decision often comes down to whether waiting until the ERC period ends is better than switching early. This is a cost comparison problem: early switching might save interest sooner but could be offset by the ERC.

LTV (loan-to-value) can affect which mortgage rates you can access. Reducing your balance through overpayments can potentially move you into a better LTV band, which may improve your options when you remortgage. This is not guaranteed and depends on property value and lender criteria.

If you are thinking about overpayments for this reason, it can help to model what the overpayments do to your balance and timeline, and to understand any ERC or allowance constraints. See the mortgage overpayments guide for the practical checks and trade-offs.

Suppose a new deal reduces your monthly payment estimate by £70. Over 24 months that is about £1,680 in gross savings. If fees and switching costs total £999 and there is no ERC, the net saving might be roughly £681 over that period.

If there is an ERC of £1,000, the switch is likely not worth it on this horizon, unless you have other reasons to switch or the rate difference is larger. This is why ERCs and fees are often the decisive factors.