Bridging mortgage: how it works, when it makes sense and when it does not

What it is, without the small print

A bridging mortgage is a loan that covers the gap between buying the next home and selling the current one: instead of two separate loans, the bank usually combines both homes into a single debt while the current one is unsold — although each lender structures it its own way. During that interim period there is usually a grace phase: a reduced payment that may cover interest only —as the Bank of Spain defines it— until the sale closes. Beware: while you pay interest only, the debt does not go down.

When the current home sells, the sale money usually pays off the corresponding part of the debt and the loan becomes an ordinary mortgage on the new home — the exact terms are set by your contract. That is the whole logic: a bridge between two banks, built to be crossed — not to live on.

What the bank usually asks for

Although each lender has its own criteria, the requirements always point to the same thing:

• Ability to carry two loads at once, even temporarily: the law requires the bank to assess your solvency in depth, counting the commitments you already have — if the sale takes long, it needs to see that you can hold on.
• A deadline to sell the current home. The bridge is not indefinite: each bank sets its cut-off date, and that date is the most important clause of all.
• The current home as additional security. While the bridge lasts, both homes usually secure the same debt.

In plain words: the bank does not share your risk — it limits it. The calendar risk remains yours.

The real risk: that the sale is delayed

The whole design of a bridging mortgage rests on one assumption: that your current home sells within the deadline. If it does not, the mechanism turns against you. When the grace period ends, the payment becomes the full one on a debt that combines two homes — and you would have to carry it every month while still unsold.

And then comes the second effect, the one almost nobody mentions: the pressure of that payment turns you into a seller in a hurry. Every month that passes, the low offer looks more reasonable. The bridge that bought you time at the start charges you for it at the end — with your sale price. That is why the right question is not "would they give it to me?", but "what happens to me if the sale takes twice as long as planned?".

When it would make sense — and when not

It makes sense when the gap is short and calculated: your home is in a market that moves, the price is well set, the paperwork is ready and the bridge deadline comfortably doubles the real time it takes to sell homes like yours. In other words: when the bridge is a convenience, not a rescue.

It does not make sense when it is the only way not to lose the home you like. If the whole plan depends on everything working first time, it is not a plan — it is a bet with your home inside. In that case, the answer is usually not better financing but a better calendar: syncing the sale and the purchase before signing anything.

There are alternatives

The bridge is not the only way across the gap. Depending on the case, longer handover deadlines or conditions linking one transaction to the other can be agreed in the contracts —the Civil Code leaves contract conditions to the parties—, or the transition can be solved with an interim home while the definitive one appears. That other path —where you live in the meantime and how to set up the safety net before selling— is in selling without ending up homeless.

Choosing between a bridge and the alternatives is not a question of courage: it is a comparison of costs and risks made with numbers in front of you, case by case.

Frequently asked questions