Remortgage vs further advance: how to borrow more

A further advance is extra borrowing from your existing lender on top of your current mortgage, often at a separate rate; a remortgage moves your whole mortgage to a new lender for a larger amount. A further advance avoids disturbing a good existing deal and can be quick; a remortgage opens the whole market and can be cheaper overall. The right choice depends on your current rate, the cost of each route, and — for contractors — which lender reads your income best.

What’s the difference between a remortgage and a further advance?

Answer first: a further advance is extra borrowing from your current lender, sitting alongside your existing mortgage; a remortgage moves your whole mortgage to a new lender for a larger amount. Both raise money against your home — the difference is whether you stay put and bolt on more, or move everything and start fresh.

A further advance keeps your main mortgage and its rate untouched and adds a separate sub-loan on top, often on its own rate and term. A remortgage replaces everything with one new, larger mortgage at a single new rate. Each has a clear case, and the better one depends on your existing deal and the cost of each route. Both are common ways to release equity or fund improvements.

When does a further advance make sense?

A further advance shines when you have a good existing deal you don’t want to lose. If your current rate is competitive, or you’re still inside a fixed period with an early repayment charge, remortgaging the whole balance could mean giving up that rate or paying a penalty. A further advance sidesteps both — your main loan carries on, and you simply add the extra.

It can also be quicker and lighter, since you’re dealing with a lender that already knows you and holds the security. The trade-off is choice: you’re limited to your lender’s further-advance rates, which may not be the sharpest in the market, and your lender still has to be willing to lend the extra on its own criteria.

When is a remortgage the better route?

A remortgage wins when the whole-of-market matters. Moving to a new lender lets you compare every option, apply one rate to the entire balance, and often release more — particularly if your current lender is cautious about additional borrowing. If your existing deal has ended (so there’s no early repayment charge) and a sharper rate is available, remortgaging the full amount can be clearly cheaper overall.

It’s a fuller process — application, valuation, legal work — and may carry fees, though many remortgage deals are fee-free. For larger sums, or where your current lender won’t lend enough, that extra effort usually pays off.

How do the costs compare?

A further advance avoids the cost of switching lender and protects a good existing rate, but the advance itself may sit at a higher rate than the market’s best, and it applies only to the new money. A remortgage applies one new rate to the whole balance, which can be cheaper across the board — but only if that rate is good and any costs are outweighed.

So the comparison isn’t just “which has lower fees” — it’s the total cost of each structure over time. A further advance at a higher rate on a small sum might still beat remortgaging your whole low-rate balance onto a higher market rate. Equally, remortgaging everything onto a sharp rate can beat keeping an aging deal plus a pricey advance. Model both on the remortgage calculator.

Which is better for contractors?

It depends on whether your current lender will lend the extra — and how it reads your income. A further advance is assessed on your lender’s criteria, which may not handle contract income well, so it could cap or decline the additional borrowing. In that case, a remortgage to a lender that applies contract-based underwriting can release more.

The practical move is to compare both: your current lender’s further-advance offer against a whole-of-market remortgage. A broker can run them side by side, so you see whether staying put or moving releases more at a lower total cost.

The bottom line

A further advance bolts extra borrowing onto your existing mortgage without disturbing a good rate — ideal when your current deal is competitive or still inside an early repayment charge. A remortgage replaces everything with a new, larger loan and opens the whole market, often cheaper overall and more generous for contractors when the current lender is cautious. Compare total cost both ways before deciding. To see which route releases more on your figures, speak to an adviser.