THE PROPERTY FILTER TAKE
Nottingham Building Society raised fixed rates by up to 80bps on 24 March, with Barclays adding up to 55bps the same day, pushing the average mortgage rate to 5.48%.
On a £200,000 interest-only BTL mortgage, an 80bps rise adds roughly £133/month to your costs - a meaningful hit to cash flow and ICR calculations.
If you have a deal approaching renewal in the next three to six months, you may wish to speak to your broker about whether locking in sooner makes sense given the current direction of travel.
Nottingham Building Society raised its fixed rates by up to 80bps (basis points - hundredths of a percentage point) on 24 March, according to Mortgage Finance Gazette. The same day, Barclays lifted prices by up to 55bps, and Moneyfacts confirmed the overall average mortgage rate had reached 5.48% - a jump of 59bps since the start of the Iran conflict. There was one piece of relief: lender Gen H cancelled a planned rate rise that had been due to take effect at 5.30pm that afternoon.
What the 80bps Rise Actually Costs You
Let's run the numbers. On a £200,000 interest-only BTL (buy-to-let) mortgage - a common size for a single investment property - an 80bps increase adds £1,600 per year in interest. That works out at £133/month extra on your monthly payment.
For a landlord running a portfolio at tight margins, that is not a rounding error. It also affects your stress test calculation. Most BTL lenders apply an ICR (interest coverage ratio) test, typically requiring rental income to cover 125% to 145% of the mortgage payment at a stressed rate. When lender criteria shift upward this fast, some deals that passed last week may not pass today. You can run your own figures using the Property Filter stress test calculator to see where your portfolio stands.
Barclays, for reference, moved a 60% LTV (loan-to-value ratio) two-year fixed to 4.83% and a 75% LTV five-year fixed to 5.05%, both increases of 55bps, per Mortgage Finance Gazette. That is a significant swing in a single day for one of the UK's largest mortgage lenders.
Gen H Reverses - and That Matters
Gen H's decision to cancel its planned hike is worth noting. The lender told brokers the reversal was possible because of how its systems and funding model work - it can reprice very quickly in either direction. The trigger, according to reports, was a signal from Donald Trump that he was postponing attacks on energy sites in Iran, which caused swap rates to ease.
This illustrates a dynamic that has defined the mortgage market in early 2026: pricing is moving with geopolitical news almost in real time. Understanding that context helps when thinking about refinance strategy and timing. A rate available at 9am is not guaranteed to be available at 5pm.
If you are mid-application or approaching a product end date, the practical step is to talk to your broker now, not next week. A good broker will know which lenders are still competitive and which are pulling products. For a grounding in how rates and lender criteria interact, it is worth reading before that conversation.
The Property Filter free resources hub also has tools to help you model the impact of rate changes across a portfolio before you commit to anything.
Key Takeaways
- Nottingham Building Society raised fixed rates by up to 80bps on 24 March, per Mortgage Finance Gazette. - Barclays added up to 55bps the same day; the average mortgage rate hit 5.48%. - On a £200,000 interest-only BTL, an 80bps hike means roughly £133/month in extra costs. - Gen H cancelled its planned rise after swap rates eased on geopolitical news. - You may wish to speak to your broker promptly if a deal is approaching renewal.
Nottingham Building Society raised its fixed rates by up to 80bps (basis points - hundredths of a percentage point) on 24 March, according to Mortgage Finance Gazette. The same day, Barclays lifted prices by up to 55bps, and Moneyfacts confirmed the overall average mortgage rate had reached 5.48% - a jump of 59bps since the start of the Iran conflict. There was one piece of relief: lender Gen H cancelled a planned rate rise that had been due to take effect at 5.30pm that afternoon.
What the 80bps Rise Actually Costs You
Let's run the numbers. On a £200,000 interest-only BTL (buy-to-let) mortgage - a common size for a single investment property - an 80bps increase adds £1,600 per year in interest. That works out at £133/month extra on your monthly payment.
For a landlord running a portfolio at tight margins, that is not a rounding error. It also affects your stress test calculation. Most BTL lenders apply an ICR (interest coverage ratio) test, typically requiring rental income to cover 125% to 145% of the mortgage payment at a stressed rate. When lender criteria shift upward this fast, some deals that passed last week may not pass today. You can run your own figures using the Property Filter stress test calculator to see where your portfolio stands.
Barclays, for reference, moved a 60% LTV (loan-to-value ratio) two-year fixed to 4.83% and a 75% LTV five-year fixed to 5.05%, both increases of 55bps, per Mortgage Finance Gazette. That is a significant swing in a single day for one of the UK's largest mortgage lenders.
Gen H Reverses - and That Matters
Gen H's decision to cancel its planned hike is worth noting. The lender told brokers the reversal was possible because of how its systems and funding model work - it can reprice very quickly in either direction. The trigger, according to reports, was a signal from Donald Trump that he was postponing attacks on energy sites in Iran, which caused swap rates to ease.
This illustrates a dynamic that has defined the mortgage market in early 2026: pricing is moving with geopolitical news almost in real time. Understanding that context helps when thinking about refinance strategy and timing. A rate available at 9am is not guaranteed to be available at 5pm.
If you are mid-application or approaching a product end date, the practical step is to talk to your broker now, not next week. A good broker will know which lenders are still competitive and which are pulling products. For a grounding in how rates and lender criteria interact, it is worth reading before that conversation.
The Property Filter free resources hub also has tools to help you model the impact of rate changes across a portfolio before you commit to anything.
Key Takeaways
- Nottingham Building Society raised fixed rates by up to 80bps on 24 March, per Mortgage Finance Gazette. - Barclays added up to 55bps the same day; the average mortgage rate hit 5.48%. - On a £200,000 interest-only BTL, an 80bps hike means roughly £133/month in extra costs. - Gen H cancelled its planned rise after swap rates eased on geopolitical news. - You may wish to speak to your broker promptly if a deal is approaching renewal.
