Mortgage Affordability in 2025: Finding the Right Balance
Affordability is back in the spotlight. According to recent figures, first-time buyers are now spending around 35% of their take-home pay on mortgage repayments. That’s above the long-term average of 30% and a clear signal of how today’s market is testing household budgets.
At the same time, house prices have nudged down slightly—Nationwide reported a 0.1% dip in August 2025—as high borrowing costs and cost-of-living pressures continue to squeeze affordability.
So, what does affordability really mean in practice? And how can expert advice help you make sense of the numbers?
What Is Mortgage Affordability?
Traditionally, the “28% rule” has been a good rule of thumb. This says your monthly housing costs (mortgage, insurance, and taxes) should stay under 28% of your gross income. It’s a useful benchmark for lenders and borrowers alike because it ties repayments to income in a clear and measurable way.
But with higher interest rates and rising property prices, sticking to that benchmark isn’t always realistic. Many households are finding that their housing costs exceed this threshold—especially first-time buyers trying to step onto the ladder in today’s market.
That doesn’t automatically mean a mortgage is unaffordable. What it does mean is that careful planning is essential, and you may need to explore different product options or term lengths to keep repayments manageable. The affordability calculation is no longer a straightforward ratio—it’s a much more individual exercise.
Why Affordability Matters More Than Ever
Affordability is at the heart of financial security. Stretching your budget too far on a mortgage can leave little room for life’s unexpected costs: car repairs, family commitments, or changes in employment. On the other hand, being too cautious may mean you miss opportunities to buy the home you really want.
The balance is delicate. That’s why mortgage advice has never been more important. Online calculators can provide a rough idea, but they rarely take into account your unique circumstances. Lenders all use slightly different criteria, and what one bank considers affordable may be declined by another. Knowing where to go can make the difference between securing your home or facing unnecessary rejection.
How Prospect Tree Mortgages Can Help
At PTM, affordability isn’t just about crunching numbers—it’s about understanding you. Every client’s financial picture is different, which is why we take the time to:
- Run personalised affordability assessments that look at income, debts, commitments, and future changes.
- Factor in flexibility—whether that means a fixed rate for peace of mind, or a longer term that gives breathing room for your budget.
- Stress test your plans against potential rate rises, so you know exactly how your payments could change.
- Explore specialist options if you’re self-employed, a company director, or have complex income streams.
Our decades of experience mean we know which lenders take a realistic view of different types of income. We work across the whole of the market, so our recommendations aren’t limited to a single bank or building society. Instead, we look at the bigger picture—helping you secure a mortgage that is affordable not just today, but in the years ahead.
Preparing for Future Payment Changes
The Bank of England has already warned that millions of homeowners could see their monthly repayments rise by an average of £107 as existing fixed deals end. That’s a significant increase for many households, especially when added to the wider cost-of-living pressures.
The good news is that it doesn’t have to come as a shock. By planning ahead, you can take control of what happens next. Some of the most effective steps include:
- Review your mortgage early—don’t wait until the last minute. Starting the process 6 months before your deal expires gives you more options.
- Switch to a competitive new rate—remortgaging can help avoid being moved onto a lender’s often higher standard variable rate.
- Adjust the mortgage term—sometimes a small change in term length can bring repayments back in line with your budget.
- Consider overpayments while rates are lower—if your budget allows, paying extra now can create a buffer for future increases.
With the right strategy, even a challenging affordability outlook can be managed. It’s about making informed decisions rather than leaving things to chance.
The Bottom Line
Mortgage affordability is about more than just numbers on a spreadsheet. It’s about making sure your mortgage fits your lifestyle, your goals, and your future plans. The current market may feel tough, but with expert advice it is possible to find solutions that keep your homeownership journey on track.
At Prospect Tree Mortgages, we combine market insight with tailored advice to help you navigate affordability challenges with confidence. Whether you’re buying your first home, moving up the ladder, or remortgaging in the face of higher rates, we’re here to work through the calculations and find a mortgage that truly fits.
Ready to review your affordability? Get in touch with our expert team today to start the conversation.
Your home may be repossessed if you do not keep up repayments on your mortgage. The information contained within was correct at the time of publication but is subject to change (correct as of 4 September 2025).
What’s Next?
If you’re thinking about moving home, remortgaging, or buying your first property, now is a great time to review your mortgage options. At Prospect Tree Mortgages, we’re here to help you understand your choices and find the best mortgage for your situation.
Get in touch with our expert advisors today to discuss how this base rate cut could benefit you. We aim to ensure you make the most of the opportunities available.
Call us at 0800 8620 840 or visit our website at www.ptmortgagesltd.co.uk to learn more.
If you’d like to learn more about mortgage products and how we can help you, please don’t hesitate to get in touch with our team. We’re here to help you navigate the ever-evolving world of mortgages and guide you toward a brighter, greener home.