For most people, buying a home is the single biggest financial commitment they will ever make. At the heart of that process for most buyers is a mortgage. If you are new to the subject or just want a clearer understanding of how it all works, here is a straightforward explanation.
The basics
A mortgage is a loan specifically used to buy property or land. Because the amounts involved are typically large, the loan is secured against the property itself. This means that if you cannot keep up with your repayments, the lender has the legal right to repossess the property and sell it to recover what is owed. It is a serious commitment, which is why understanding what you are taking on matters.
Most mortgages in the UK run for 25 years, though terms can be shorter or longer depending on your circumstances and what you can afford to repay each month.
How repayments work
When you buy a property with a mortgage, you put down a deposit, typically between 5% and 20% of the purchase price, sometimes more. The mortgage covers the remainder. You then make monthly repayments to the lender over the agreed term.
There are two main ways those repayments can be structured.
With a repayment mortgage, each monthly payment covers both the interest on the loan and a portion of the capital you borrowed. By the end of the term, you have paid off everything and own the property outright. This is the most common arrangement.
With an interest-only mortgage, your monthly payments only cover the interest. The original loan amount remains outstanding and must be repaid in full at the end of the term. You need a credible plan in place to do that, such as an investment or savings strategy. Interest-only mortgages are less common for residential buyers and lenders apply strict criteria.
Types of mortgage deal
Fixed-rate mortgages lock your interest rate in for a set period, typically two to five years. Your monthly payments stay the same for that period regardless of what happens to wider interest rates, which makes budgeting straightforward. At the end of the fixed period, you usually move onto the lender’s standard variable rate or remortgage to a new deal.
Variable rate mortgages have an interest rate that can change. A standard variable rate (SVR) is set by the lender and can go up or down at their discretion. A tracker mortgage follows the Bank of England base rate, moving up or down in line with it plus a fixed percentage on top.
What lenders look at
When you apply for a mortgage, lenders assess your credit history, income, regular outgoings, and any existing debts to decide how much they are prepared to lend and at what rate. A strong credit score and a stable income generally mean access to better deals.
Getting advice from a qualified mortgage adviser before you apply is well worth doing. They can assess your circumstances, identify the most suitable products, and guide you through the application process, which can save both time and money.
Your home may be repossessed if you do not keep up repayments on your mortgage.
Approved by In Partnership FRN 192638 June 2026
