The essential guide to Mortgages

Most property in the UK is bought with a mortgage. Outstanding residential mortgage debt reached £1,746.1 billion in the first quarter of 2026, according to the FCA, the highest figure on record. The market backing that debt moves fast: Moneyfacts recorded the average mortgage product sitting on the market for just 11 days at the start of August 2026, before being repriced or withdrawn.

That speed is the real complexity. Not the number of products, the number of decisions you're making before the market moves again. This guide sets out those decisions in the order you'll actually face them.

How much you can borrow

Lenders typically work to a rule of thumb of around 4.5 times your annual income, though your actual figure moves with your employment status, any bonus or commission income, existing credit commitments, and your credit history.

A mortgage in principle gives you a working number before you view a single property. Most applications complete online in minutes, run only a soft credit check that won't affect your score, and stay valid for around three months. Many estate agents expect to see one before passing on an offer.

It's an indication, not a guarantee, and you're not tied to the lender who issued it. Run your own numbers alongside the lender's: what a lender confirms you can borrow isn't the same as what you can comfortably live with month to month.

If you're buying to let, the amount you can borrow usually depends on the property's rental income rather than your own, with lenders typically expecting rent to run 25% to 45% higher than the mortgage repayment. You'll often still need to evidence your own income too, in case the property sits empty between tenants.

Repayment or interest-only

A repayment mortgage clears interest and capital together, so you own the property outright at the end of the term. An interest-only mortgage keeps your monthly payment lower, but you still owe the full amount borrowed when the term ends. It's become far less common as a result: interest-only mortgages made up around 9% of regulated mortgages in the FCA's most recent breakdown, with a large share of that stock due to mature within the decade.

On £200,000 borrowed at the current average two-year fixed rate of 5.63%, over 25 years, the difference looks like this: roughly £1,244 a month on a repayment mortgage, against around £938 a month interest-only.

Lower payments now aren't free. They just move the cost to later, and only work if you have a credible plan for clearing the balance, whether that's other assets, an investment vehicle, or selling the property.

What your loan-to-value ratio does to your rate

Loan-to-value (LTV) is what you're borrowing set against the property's value. Buy a £200,000 property with a £20,000 deposit and your LTV is 90%. It falls as you repay the mortgage or as the property's value rises.

The gap this creates is real money. According to Moneyfacts' July 2026 data, the average two-year fixed rate at 95% LTV sat at 6.13%, against 4.97% at 60% LTV, a gap of over a full percentage point on the same product type. Moving into a lower LTV band, whether through a bigger deposit, an overpayment, or simply getting your home revalued after it's gone up in value, can move your rate meaningfully without you touching the loan itself.

LTV isn't the only thing setting your rate. Lenders weigh your credit report and run affordability tests alongside it, so checking your report before you apply gives you the chance to fix errors, or approach a specialist lender, before a decline shows up on your file.

Fixed, or tracker and variable

A fixed rate holds your payment steady, usually for two to ten years, at the cost of missing out if rates fall, and fixed deals often start slightly higher than comparable variable ones.

A tracker rate moves directly with the Bank of England base rate. A variable rate moves with your lender's own rate instead, which can shift independently of the Bank's decisions. Either way, your payment can rise or fall at any point during the deal.

The Bank of England base rate has held at 3.75% since its 30 July 2026 decision, a hawkish vote with three committee members pushing for a rise rather than a hold. Where it goes next isn't something any lender, or this guide, can promise you. What's certain is what happens when your deal ends: you're moved onto your lender's standard variable rate, currently averaging 7.13%, unless you act first. Rate type matters. So does the date your current deal expires.

How your term changes the total cost

On a £250,000 repayment mortgage at the current average two-year fixed rate of 5.63%, term length changes both your monthly payment and what you pay overall:

Calculated using Moneyfacts' average two-year fixed rate as of 10 August 2026, for illustration only.

A longer term buys lower monthly payments and costs more overall. You can often revisit this later: shorten the term if a pay rise gives you room, or extend it if you need to bring outgoings down. Your age plays a part too, since most lenders want the mortgage cleared before you retire.

The fees that sit alongside the rate

The headline rate isn't the full cost of a deal.

Arrangement and application fees can be a flat charge or a percentage of the loan, sometimes higher for buy-to-let. Fee-free products exist, but they usually carry a higher rate, so the fee-paying option can still work out cheaper over the full term. Run the comparison rather than assuming either way.

Valuation fees cover the lender confirming the property is worth what you're paying, sometimes done remotely, sometimes in person. A basic valuation isn't a survey: it protects the lender's interest, not yours. A homebuyer's report checks visible issues; a full structural survey goes further and is worth considering on an older or unconventional property.

Early repayment charges apply if you overpay beyond what your lender allows, typically up to 10% of the outstanding balance a year without a charge. If overpaying is part of your plan, check the ERC terms before you commit to a deal, not after.

If you're saving toward a deposit

A Lifetime ISA (LISA) lets you pay in up to £4,000 a year, with the government adding 25%, up to £1,000 a year, toward a first home worth £450,000 or less. You need to open one between 18 and 39, though you can keep contributing until 50. Withdraw the money for anything other than a first home before you turn 60, and you lose the 25% bonus along with a slice of your own savings, not just the government's contribution.

The LISA itself has an end date. From April 2028, it's being replaced by a new First-Time Buyer ISA, confirmed in a government consultation launched in June 2026. The new account drops the retirement-savings option entirely, focusing on first-home purchases only, removes the 25% withdrawal penalty, and pays its bonus as a lump sum when you complete rather than building it up monthly. If you already hold a LISA, or open one before the replacement launches, you keep the current rules and can carry on contributing indefinitely; nothing forces you to switch. The exact bonus rate, contribution limit, and any property price cap on the new account are still being finalised, so it's worth checking the position again closer to 2028 if it's relevant to your plans.

Where a broker earns their place

You can search and apply directly. A broker changes what you're choosing from and how your application lands.

They search across lenders you wouldn't otherwise see, including ones that don't deal with the public directly, and match your circumstances to the lenders most likely to say yes, not just the ones with the lowest headline rate. That matters more if you're self-employed, have a complex income, or a less-than-perfect credit history.

They also review your paperwork before it reaches a lender, catching the errors that cause delays or declines, and they're positioned to flag it when your deal is approaching its end, at a market moving fast enough that the product you're on today may not exist in the same form next month.

Beyond the mortgage itself, a broker is often a natural point to raise financial protection: what happens to your repayments if illness or injury stopped you working, and what happens to your family's home if you weren't there to keep paying for it.

What a clear plan gets you

Get these decisions right and a mortgage stops being a single number you're quoted and becomes something you've actually chosen: the right structure, the right rate type, the right term, the right lender for your circumstances, and full sight of what happens the day your deal ends.

If you have questions about your current mortgage, or you're ready to look at a new deal, talk to us. We'll help you find the right lender and product, and stay with you through the parts of the process that usually cause the most friction.

Important information

This guide is provided by Pembroke Financial Planning Limited for general information only and does not constitute advice. The information is aimed at retail clients only. Your home may be repossessed if you do not keep up repayments on a mortgage or other loans secured on it. Equity released from your home will be secured against it. The Financial Conduct Authority does not regulate some buy-to-let and commercial mortgages.

Sources: FCA, Mortgage Lending Statistics, Q1 2026, outstanding residential mortgage debt. FCA, most recent published breakdown of mortgage product types, interest-only share. Moneyfacts, UK Mortgage Trends Treasury Report, 10 August 2026 (average rates and SVR) and July 2026 (LTV rate comparison), and average mortgage shelf-life, early August 2026. Bank of England, base rate decision, 30 July 2026. Repayment, interest-only and term illustrations calculated on the stated loan amounts using the Moneyfacts average two-year fixed rate above, for illustration only.