For most UK homeowners, the best time to start looking at a remortgage is around three to six months before the current deal ends. That does not mean switching immediately. The goal is to arrange the next mortgage early enough for it to be ready when your existing fixed or discounted rate finishes, while avoiding an unnecessary early repayment charge.
You can technically remortgage at almost any point, subject to lender criteria and your current mortgage terms. However, completing a remortgage before your fixed rate ending date can trigger fees. Planning ahead gives you time to compare your current lender’s options with deals elsewhere and choose a completion date that fits your existing mortgage.
How early can you arrange a remortgage?
A useful starting point is six months before your deal ends. MoneyHelper recommends beginning the switching process up to six months before a fixed or discounted deal reverts to the lender’s standard variable rate. Some lenders work on shorter timescales, so the exact point at which you can apply or reserve a rate depends on the lender and product.
Under the UK Mortgage Charter, participating lenders have committed to allowing eligible customers to lock in a new deal up to six months before the end of a fixed-rate deal. Customers can also ask for a better like-for-like deal before the new rate starts if one becomes available. That makes early planning useful even when you do not want the new mortgage to complete yet.
Arranging early is different from completing early
This is the distinction that matters most. You might apply for a new mortgage several months before your existing deal ends, receive an offer, and arrange for the remortgage to complete only after the old fixed period finishes. You are preparing early without necessarily leaving your current mortgage early.
If the new mortgage completes while your existing deal is still inside an early repayment charge period, your current lender may charge an ERC. The FCA says these charges are commonly linked to the remaining mortgage balance and often reduce as a deal gets closer to its end, although the exact terms depend on your mortgage contract.
Check your mortgage statement or online account for the fixed-rate end date, the ERC end date and the amount payable if you redeem now. Early repayment charges are worth understanding before you focus on headline rates because a large ERC can wipe out the benefit of switching sooner.
Why three to six months is often a sensible window
Starting several months ahead gives you breathing room. A remortgage can involve affordability checks, credit checks, a property valuation, legal work and document requests. Delays are possible, particularly where income is complex or the property needs extra legal or valuation work.
It also gives you time to compare total costs. A mortgage with a lower rate can still be more expensive once product fees, legal costs, valuation charges and any ERC are included. If your current lender offers a product transfer, compare it with a full remortgage rather than assuming moving lender is automatically better.
Mortgage offer validity matters
Mortgage offer validity varies by lender and product. Six months is common for some mainstream offers, but it should never be assumed. The expiry date on your actual offer is what matters. If it expires before you are ready to complete, you may need an extension or fresh application, and the available rate could be different.
Applying extremely early is therefore not always useful. The aim is to line up the application, offer validity and intended completion date. If your fixed deal ends in five months, for example, an offer that remains valid long enough could let you prepare now and complete after the fixed rate has ended.
A practical timing example
Suppose your fixed rate ends on 30 November and an ERC applies until then. In early June, you check the details and start comparing deals. During June or July, you find a suitable remortgage, complete the application and ask for completion after your existing deal ends.
If rates fall before completion, you can ask whether a better eligible product is available. If rates rise, a deal already secured may offer some protection, subject to its terms. The important point is that the date you arrange the mortgage and the date you leave the old one do not have to be the same.
When could paying an ERC still make sense?
Sometimes a homeowner may deliberately remortgage before the current deal ends. This can make sense if the savings from the new mortgage outweigh the ERC and every other switching cost. Compare the ERC, product fee, legal or valuation costs, exit fees and expected interest cost rather than looking only at the monthly payment.
If the ERC is several thousand pounds, a modest rate reduction may take too long to recover the cost. A mortgage adviser can help where the numbers are close or your circumstances are complicated.
What to check before you apply
Confirm your exact deal end date and any ERC. Ask your current lender when you can reserve a product transfer, then compare that with remortgage deals from other lenders. Check your approximate property value and outstanding balance so you understand your loan-to-value position, as a lower LTV can sometimes improve the range of rates available.
Review your income, regular commitments and credit position before applying because a new lender will normally assess affordability and eligibility. Finally, confirm the new lender’s mortgage offer validity and make sure the planned completion date does not fall inside an ERC period unless you have consciously decided that paying the charge is worthwhile.
Frequently asked questions
Can I remortgage six months before my fixed deal ends?
You can often start researching and, with many lenders, apply or secure a deal around six months before the end date. You can usually plan for completion after the current deal ends to avoid an ERC.
Can I remortgage before my fixed rate ends?
Yes, but completing the switch early may trigger an early repayment charge. Check the cost first and compare it with the potential savings from the new deal.
What happens if my mortgage offer expires before my deal ends?
You may need an extension or a fresh application. Extensions are not guaranteed, and a new application could be based on the products and rates available at that time.
Should I wait until my fixed rate has ended before looking?
Usually not. Waiting can leave too little time for the application and could result in a period on your lender’s standard variable rate. Starting three to six months early is generally more practical.
Plan early, but complete at the right time
For most homeowners, the sensible answer is to start preparing around three to six months before the current deal ends. The right completion date is a separate decision. Check your ERC, compare a product transfer with the wider market, confirm how long any new mortgage offer remains valid, and time the switch carefully. Planning early gives you more options while helping you avoid unnecessary charges when your fixed rate is ending.