Start With the Six-Month Rule

If you are on a fixed rate, the single most useful date in your diary is the day your current deal ends. Six months before that date is when you should start looking seriously at your options. Most lenders will let you reserve a new rate that far ahead, so you can secure something competitive now and switch to a better deal later if rates improve before completion.

Suppose your fixed rate finishes at the end of September. You would typically begin comparing deals in March, submit an application in April or May, and complete in time for the new deal to start the day the old one ends. That avoids the gap where you drift onto your lender's standard variable rate, which is usually considerably more expensive.

There is one important exception to the six-month rule. If you are already sitting on a standard variable rate, or you were moved onto one when a deal ended, you do not need to wait at all. Every month you stay there is a month you are almost certainly paying more than you need to.

Signs It Is Worth Reviewing Your Mortgage

Remortgaging is not something to do on a whim, because there are costs involved. But there are clear situations where a review is sensible:

• Your fixed or tracker deal ends within six months. This is the classic trigger, and the one with the least risk attached.
• You have slipped onto a standard variable rate. Even a modest rate reduction here can be worth several hundred pounds a year.
• Your loan-to-value has fallen. Property price growth and years of capital repayments may have pushed you into a cheaper band. Crossing from 90% to 85%, or 85% to 80%, often unlocks noticeably better rates.
• Your circumstances have improved. A pay rise, a cleared credit card balance or a settled credit file can all translate into a sharper rate.
• You need to borrow more. Funding an extension, a new kitchen or a loft conversion through your mortgage is usually cheaper than a personal loan.

Lowering Your Monthly Payments

The most common reason to remortgage is straightforward: to pay less each month. This usually happens in one of two ways. Either you move to a lender offering a lower rate, or you stay with your existing lender but move onto a new product, which is often called a product transfer.

The maths matters more than the headline rate. A product fee of around £999 plus valuation and legal costs can easily wipe out a small saving. As a rough guide, a £200,000 mortgage repaid over 25 years costs about £58 more each month at 5% than at 4.5%. That is roughly £700 a year, so a £999 fee would take more than a year to recover. If you plan to stay put for several years, the cheaper rate usually wins. If you might move soon, a fee-free deal can make more sense.

Product transfers with your current lender are often quicker, involve less paperwork, and sometimes skip a full affordability assessment. They are not always the cheapest option, but they are worth comparing alongside a full remortgage rather than dismissing out of hand.

Releasing Equity for Home Improvements

Remortgaging to release equity lets you borrow against the value you have built up in your home, rather than taking on a separate loan at a higher rate. If your property is worth £300,000 and you owe £150,000, you have £150,000 of equity. Taking an extra £25,000 for a kitchen extension is unlikely to be a problem, provided the numbers stack up.

Lenders will want to know what the money is for. Structural work that adds value, such as an extension or a loft conversion, tends to be viewed more favourably than spending on holidays or a new car. They will also check that the larger mortgage remains affordable against your income.

Two practical points. First, spreading the additional borrowing over a long term means paying interest on it for decades, so consider whether overpaying or a shorter term suits you better. Second, try to keep your overall loan-to-value below 80% if you can, as that gives you a buffer if house prices dip and keeps you in a better rate band.

When Remortgaging Might Not Be Right

Timing matters, and sometimes the answer is simply to wait.

• You are still inside your fixed rate period. Early repayment charges can run into thousands of pounds. Work out the exact figure before doing anything.
• You are planning to move within a year or two. Porting your existing deal or taking a product transfer may be cheaper than remortgaging now and again shortly.
• Your balance is small. On a modest mortgage, fees can swallow the saving entirely.
• Your income has dipped or your credit file has recent problems. Applying and being declined leaves a mark, so it is often better to wait a few months and tidy things up.

Getting Ready to Apply

Preparation makes the process smoother and can improve the rate you are offered. Check your credit report several months ahead and correct anything inaccurate. Avoid applying for new credit cards or car finance in the run-up to an application, as each search leaves a footprint.

Have your documents ready: photo ID, proof of address, three months of payslips or two years of accounts if you are self-employed, recent bank statements, and your latest mortgage statement. Knowing your outstanding balance, your early repayment charge figure and your deal end date means you can compare options properly rather than guessing.

Finally, remember that you can usually lock in a rate and then ask your lender to switch you to a cheaper product before completion if the market improves. It costs nothing to keep your options open, and it means you are never forced to accept a rate that has since been beaten.