The Remortgage 6-Month Window
Proactive rate review starts 6 months out — don't wait for your lender to contact you
When a UK fixed-rate mortgage expires, the default behaviour is either staying on the lender's standard variable rate (expensive) or waiting until the last month and rushing into whatever is available. Both are suboptimal. Emmerson runs a structured 6-month process with clients on his book: initiate the conversation at six months out, establish the new financial picture, and then make an active decision about timing — rather than being forced into whatever rate happens to be available on expiry day.
The framework has a deliberate hold layer: in a declining rate environment, locking in a new product immediately at six months out means missing further cuts between now and expiry. Emmerson's approach is to get the analysis done early, identify the target range, and then hold until closer to expiry — but not so late that the administration window is missed. Six weeks before expiry is typically enough time to switch lender; switching with your existing lender can be done right up to the month before.
The framework also covers an underused option: keeping two mortgage offers live concurrently. When a borrower has a few months between offer acceptance and drawdown, the broker can submit to multiple lenders and switch to whichever has improved further by completion — an approach most brokers avoid but which consistently delivers better outcomes.
- Start the remortgage conversation 6 months before expiry — early enough to plan, late enough that the new product will be relevant.
- In a falling rate environment, hold on pulling the trigger: analysis now, commitment closer to expiry.
- Six weeks before expiry is the minimum needed to switch lender; same-lender switches can happen up to the month before.
- Keeping two mortgage offers live concurrently is legal and often delivers better outcomes than committing to one lender at offer stage.
- Paying an exit penalty can sometimes be justified if the new rate saves more over the remaining term — always run the full cost comparison.
- Contact your broker 6 months before your rate expiresEven if you don't intend to change anything, this conversation establishes what your new financial profile looks like — income changes, life stage shifts, new plans — and what product types your broker would recommend.Pro tipIf your income has increased significantly since your last mortgage, you may be eligible for a better rate tier or to release equity for investment.
- Run the hold vs lock decision with rate direction in mindAsk your broker to quantify the cost of locking in now versus waiting. If rates are declining, estimate the expected saving from waiting 3-4 more months. If geopolitical risk is elevated, there may be value in locking a floor rate now while watching for further cuts.Pro tipEmmerson's approach in late 2024: lock something as a worst-case floor, then monitor — if rates keep dropping, switch before the lock is fully committed.WarningDo not wait so long that you end up on SVR — the cost of a few weeks on SVR can exceed any gain from a slightly lower new rate.
- If buying: submit to two lenders concurrentlyIn the 3-4 month window between offer acceptance and mortgage drawdown, ask your broker to keep the original lender application live while also approaching a competitor. If rates improve at either lender, switch to the better offer before completion.Pro tipMajor lenders control their flow by adjusting rates up or down the best-buy table — quiet periods often produce temporary rate cuts from lenders chasing volume.WarningMost brokers dislike this approach because it doubles their admin; a good broker will do it anyway because it is the right advice.
- Run an exit-penalty cost analysis if already mid-fixIf you are inside an existing fix and rates have moved significantly since you locked, ask your broker to model the full-term saving from switching versus the exit penalty. Even a 3-4% ERC can be exceeded by the saving from a lower rate across the remaining term.WarningThis analysis only makes sense if rates have fallen materially since your fix was arranged — if they have risen, there is no case for early exit.
- Confirm the administration timeline with your brokerKnow precisely when you need to commit: 6 weeks before for a new lender, end of the month before for your existing lender. Build backward from those dates to set your final decision point.
A client remortgaged during the Liz Truss budget period and took a 5-year fix at peak rates. By late 2024, Emmerson ran a full cost comparison: paying the ERC to exit early and switching to the current lower rate would save money across the remaining term, but the further decline in rates suggested holding just a little longer.
In a purchase with four months between offer acceptance and drawdown, Emmerson submitted to NatWest and then, midway through, Barclays published a better rate. Both applications were kept live concurrently.
A borrower on a mid-LTV product originally qualified at maximum affordability. By remortgage, their income had grown and LTV had fallen through capital repayments and price appreciation.
Emmerson describes proactively calling clients on his book as their fixed rate approaches. The practice is driven by observing what happens to clients who don't get this call: they roll onto SVR, miss rate improvements, or panic-lock at the worst point in the cycle. The case of a client who remortgaged at peak rates during the Liz Truss budget period illustrates the worst-case outcome — and the cost-benefit analysis of paying an early exit penalty to get onto a better product.