Should You Refinance Your Mortgage?

Refinancing gets talked about constantly, usually framed around chasing a lower rate or a cashback offer. Sometimes that is exactly the right call. Other times it costs more than it saves once you account for everything involved. Here is how I actually walk clients through the decision.

What refinancing actually means

Refinancing means moving your mortgage from one lender to another, or occasionally restructuring significantly with your existing lender in a way that is functionally similar. The new lender pays out your existing loan, and you begin a new lending relationship with new terms, and often, a new structure entirely.

In practice, the process runs roughly like this. You compare offers across lenders, usually with an adviser doing the legwork on your behalf. You settle on a lender and structure, and that new lender issues a formal offer. Your solicitor then handles the legal side, discharging your existing mortgage and registering the new one, with a registered valuation typically required somewhere in this process. On an agreed date, the new lender pays out your old loan in full, and your mortgage now sits with the new lender under its new terms.

The whole process, from deciding to refinance through to the new loan settling, commonly takes somewhere around three to six weeks, though this varies depending on how quickly documentation moves and whether a valuation is required.

Cashback offers

Many lenders offer a cash contribution, often expressed as a percentage of your loan amount, to attract new customers switching from another bank. This can genuinely be worth having, but it should never be the only reason to refinance. Cashback offers frequently come with a condition that you stay with the lender for a minimum period, commonly around two to four years, and if you leave before that period is up, you may need to repay some or all of the cashback. It is a genuine benefit, not a trap, but it needs to be read properly rather than treated as free money with no strings attached.

Loan structure

Rate is usually what draws people's attention first, but loan structure is often where the real long term value sits. Refinancing is a natural opportunity to reconsider things like how much of your loan is fixed versus floating, whether your term still matches your goals, and whether features like offset accounts or revolving credit facilities would genuinely benefit your situation. A slightly better rate paired with a poorly considered structure can end up costing more than a slightly worse rate with a structure that actually fits how you use your money.

This is genuinely where an adviser earns their keep in a refinance. Comparing headline rates takes a few minutes online. Working out whether a different structure, a different split between fixed and floating, or a different term would put you in a meaningfully better position over the next several years takes a proper conversation about your actual goals, which is exactly what I sit down and do with clients before recommending any switch.

Legal costs and registered valuations

Refinancing is not free to execute. You will typically need a solicitor to handle the discharge of your existing mortgage and the registration of the new one, which comes with legal fees. Many lenders also require a registered valuation of your property before approving the new loan, which is another cost to factor in. Some lenders offer to cover part or all of these costs as an incentive, which is worth asking about directly rather than assuming it is standard.

Break fees

If you are currently on a fixed rate and refinance before that fixed term ends, your existing lender will generally charge a break fee. This is calculated based on the difference between your original fixed rate and current wholesale rates, among other factors, and it can be a genuinely significant amount depending on how much time is left on your term and how rates have moved. Before committing to refinance mid fixed term, getting an actual break fee quote from your current lender is essential, since the number is sometimes larger than people expect.

It is worth requesting this figure in writing rather than relying on a verbal estimate, since break fee calculations can be complex and the exact amount genuinely does depend on market movements right up until the day it is calculated. Having a firm number, not an estimate, is what actually allows you to properly weigh a refinance decision rather than guessing at the cost side of the equation.

When refinancing makes sense

• Your current fixed term is ending anyway, so there is no break fee to weigh against the benefit.
• You need a loan structure your current lender genuinely cannot offer, such as specific offset or revolving credit features.
• Your financial situation has improved enough that you now qualify for materially better terms elsewhere.
• The combined value of a better rate, cashback, and improved structure clearly outweighs the switching costs, even after accounting for break fees if applicable.

When it does not

• The break fee to exit your current fixed term outweighs the benefit of switching.
• The rate difference is marginal once legal costs and valuation fees are factored in.
• You are chasing a cashback offer without genuinely comparing the full picture, including any minimum term conditions attached.

Timing also matters more than people expect. If you are only a few months away from your fixed term naturally expiring anyway, it is often worth simply waiting, since you avoid the break fee entirely and can compare the market properly at that point without any penalty at all. Refinancing mid term only really makes sense when the benefit clearly and meaningfully outweighs the cost of breaking early, not when the numbers are marginal.

Common mistakes

The mistake I see most often is comparing headline rates in isolation, without factoring in break fees, legal costs, and the value of your current loan structure. The second most common is refinancing purely for a cashback offer without reading the minimum term conditions attached to it. A proper refinance decision weighs the complete picture, not a single number.

A useful way to actually compare two options properly is to work out the total cost of each path over the period you realistically expect to stay in the loan, not just the first year. A slightly higher rate with no break fee and no legal costs can genuinely come out ahead of a lower rate that costs several thousand dollars to access, once you look at it over two or three years rather than judging the interest rate alone. This is exactly the kind of comparison I run for clients before recommending either staying put or making the switch.

Frequently asked questions