Compare the combined cost of both loans
Keeping a favourable first mortgage can be useful, but the second loan has its own rate, fees and term. We compare the total monthly commitment and the interest across the proposed repayment period, including the cost of changing the first mortgage.
How I approach the case
We begin with what you want to achieve, your timescale and any part of the case that needs explaining. I review the evidence and suitable lender routes, then explain the available options and their costs. A recommendation follows the individual assessment; an initial conversation does not commit you to an application.
Where legal, tax or other specialist advice is needed, we identify it early so the finance fits the wider transaction. Tell me about any change in employment, borrowing, deposit or property details before proceeding.
What to prepare
- First mortgage balance and charges
- Property value
- Amount and purpose of new borrowing
- Full income and commitments
You do not need every document before saying hello. Start with a short outline; detailed or sensitive records should follow through an agreed secure route.
Both loans are secured on the property. A longer second-loan term can reduce payments while increasing the total repaid.
Your questions, answered
What should I budget for beyond the deposit?
Build a separate allowance for legal work, a survey, any property tax, moving and immediate repairs. Then consider the monthly mortgage alongside bills, insurance and existing commitments. A budget with some room left over is more useful than a purchase price on its own.
Link to this answerHow do we compare mortgage options?
We consider the amount borrowed, the term, repayment method, initial rate period, fees and flexibility together. Tell me if you expect to move, make overpayments or change your working pattern. A lower initial payment does not, by itself, establish that a mortgage is the right fit.
Link to this answerWhat can change between our first conversation and completion?
A different purchase price, property issue, change in income or new borrowing can affect the assessment. Keep me informed before making a commitment. A lender’s initial indication is followed by its full checks, valuation and offer conditions.
Link to this answerFurther reading: MoneyHelper: mortgages and homebuying. Content updated 17 September 2026. General information; availability depends on the individual case.