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Remortgage £300,000 — Rates, Monthly Costs and Options

A £300,000 remortgage is common in London, the South East, and increasingly in major regional cities as house prices have risen over the past decade. At this loan size, the financial stakes are high — switching from a 7.5% SVR to a 4.3% five-year fix saves around £583 a month and approximately £35,000 across five years. Income requirements and LTV bands are the two main variables that shape the rates available to you.

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Monthly Payment Breakdown for a £300,000 Remortgage

For a £300,000 repayment mortgage over a 25-year term, the approximate monthly costs at current UK market rates are as follows.

At a 5-year fixed rate of 4.3%, the monthly repayment is approximately £1,634. At a 2-year fixed rate of 4.6%, the monthly cost rises to around £1,685. On a standard variable rate of 7.5%, the monthly payment is approximately £2,217.

Switching from the SVR to the 5-year fix saves roughly £583 per month — an annual saving of approximately £7,000 and a total saving of around £35,001 over five years. The 2-year fix versus SVR saves about £532 per month, or approximately £6,389 per year. The monthly cost difference between the two fix options is about £51.

For those able to consider a shorter term: £300,000 at 4.3% over 20 years costs approximately £1,855 per month — around £221 more than the 25-year equivalent. Over the 20-year life of the mortgage, this higher payment results in substantially lower total interest paid and eliminates five years of mortgage outgoings. At 15 years, the monthly payment on £300,000 at 4.3% is approximately £2,248 per month — a high commitment but one that eliminates the mortgage a full decade sooner than the 25-year option.

LTV Ratios and Rate Tiers for a £300,000 Loan

For a £300,000 loan, the property values at each LTV threshold are: £333,333 for 90% LTV, £352,941 for 85% LTV, £375,000 for 80% LTV, £400,000 for 75% LTV, and £500,000 for 60% LTV.

To access the 75% rate tier you need a property worth at least £400,000 — a figure comfortably met in much of London and the South East, and increasingly in major regional cities. The 60% LTV threshold at £500,000 is achievable for homeowners who purchased in strong-growth areas and have made regular capital repayments. At 60% LTV, you access the most competitive rates from every mainstream lender.

Rate differentials across LTV tiers are proportionally the same as at lower loan sizes but the absolute pound value is higher. A 0.3% rate improvement on £300,000 saves approximately £45 per month or £2,700 over five years. The step from 75% to 60% LTV often yields a rate reduction of 0.2 to 0.4 percentage points, worth £30 to £60 per month on £300,000.

At 80% LTV on a £300,000 loan (property worth £375,000), most mainstream lenders are active and competitive. At 85% LTV (property worth approximately £352,941), the product range is slightly more restricted but options are still available through high-street and specialist lenders. Above 85% LTV, the higher-risk tier, products are limited and rates are materially higher.

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"Our fixed rate was ending in a month and I was panicking about going onto the SVR. Managed to get everything sorted really quickly and we're now on a much better rate. Saving us about £200 a month."
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Income Required to Remortgage £300,000

To borrow £300,000 as a sole applicant using a standard 4.5 times income multiple, you would need an annual income of approximately £66,667. This is a senior professional or high-earner income level. For joint applicants, a combined income of £66,667 — achievable by many dual-income couples in professional employment — satisfies this threshold.

At this loan size, income multiple flexibility becomes more important. Several mainstream lenders — including Nationwide, Halifax, and HSBC — offer 5 times income multiples for borrowers with strong income profiles or those in certain professions. At 5 times, a sole applicant earning £60,000 could borrow up to £300,000. A mortgage broker can identify which lenders are prepared to apply enhanced multiples for your specific situation.

The affordability stress test on £300,000 at 7.5% over 25 years produces a monthly payment of approximately £2,217. Lenders confirm your income and outgoings support this payment. For borrowers earning £67,000 or above, the stress test is usually passed comfortably. If you have existing credit commitments — car finance, personal loans, or high credit card limits — these will reduce your available borrowing capacity and should be reduced where possible before applying.

Large-loan lenders — sometimes called jumbo lenders in the UK context — include private banks, portfolio lenders, and specialist providers. While £300,000 is not conventionally a jumbo loan, some specialist lenders operate in this space and can be useful for borrowers with complex income structures, self-employment income, or unusual property types. A whole-of-market broker will have access to these lenders alongside the mainstream market.

How to Get the Best Rate on a £300,000 Remortgage

With £300,000 in borrowing, securing the best available rate is a financially significant undertaking. A 0.25% rate difference equates to £56 per month or £3,360 over five years. The effort of thorough preparation and market comparison is clearly worth it at this level.

Start with a clear picture of your current financial position: LTV, credit score, income documentation, and the terms of your existing deal. If you are approaching the end of your ERC period — or have already moved onto the SVR — act promptly. At £300,000 on a 7.5% SVR, every month of delay costs approximately £583 more than necessary.

Consider the total cost of remortgaging, including legal fees, valuation costs, and arrangement fees. At this loan size, many lenders offer free valuations and free standard legal work. Some offer cashback of £250 to £500. These incentives can partially or fully offset an arrangement fee, making the effective cost of switching much lower than it appears. Always calculate the total cost over your chosen fixed term rather than focusing solely on the headline rate.

Comparison of 2-year versus 5-year fixes at this loan size: the 2-year fix at 4.6% costs about £1,685 per month versus £1,634 for the 5-year at 4.3% — a difference of £51 per month. If you expect interest rates to fall materially in the next two years, the 2-year fix gives you the opportunity to refix at a lower rate sooner. If you value certainty and want to lock in today's rate for five years, the 5-year fix is typically the better choice at the current differential.

Important: Your home may be repossessed if you do not keep up repayments on your mortgage. There will be a fee for mortgage advice. The actual rate available will depend on your circumstances. Think carefully before securing other debts against your home.

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Frequently Asked Questions

At a 5-year fixed rate of 4.3%, monthly repayments on a £300,000 repayment mortgage over 25 years are approximately £1,634. At a 2-year fixed rate of 4.6% the cost rises to around £1,685. On a standard variable rate of 7.5% the monthly payment is approximately £2,217. Switching from the SVR to the 5-year fix saves around £583 per month — approximately £7,000 per year or £35,001 over five years.

Using a 4.5 times income multiple, a sole applicant needs approximately £66,667 per year. At a 5 times multiple (available from several lenders), the minimum sole income falls to £60,000. Joint applicants can combine incomes, with a combined total of £66,667 satisfying most lenders. A broker can identify lenders most likely to be favourable for your income level and employment status.

To achieve a 75% LTV on a £300,000 loan, your property needs to be worth at least £400,000. For 60% LTV — the best rate tier — the required property value is £500,000. In London, the South East, and several major cities, these values are increasingly common, and many borrowers with £300,000 balances are already in the 75% or 60% tier due to historic house price growth.

At £300,000 you are approaching but not yet in the territory where specialist large-loan lenders become essential — most mainstream banks and building societies are fully competitive at this level. However, if you have a complex income structure, are self-employed, or have an unusual property type, some specialist lenders and portfolio providers operate in this space and may offer more flexible criteria than the high street. A whole-of-market broker will access all relevant options.

In the current market, the 5-year fix at around 4.3% is typically cheaper than the 2-year equivalent at around 4.6% — saving approximately £51 per month. The 5-year fix offers cost certainty for a longer period, which can be valuable if you have a tight monthly budget or want to plan ahead. The 2-year fix gives you the option to refix sooner if rates fall, but at a higher current monthly cost. For most borrowers at £300,000, the 5-year fix currently offers the better combination of rate and certainty.

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