A First Time Buyer's guide to Mortgages

Updated: 16th Dec, 2024

Author: Charlotte Burton

A First Time Buyer's guide to Mortgages

As a first time home buyer navigating the complex world of mortgages can be overwhelming! In this guide we will explain how mortgages work so you can make informed decisions going forward.

A mortgage is a loan from a lender (normally a bank or building society) to purchase a property. This loan is “secured” by the property, which means if you cannot keep up with payments, then the lender can repossess and sell the property to get their money back.


How much you can borrow

The lender will calculate how much they are willing to lend you based on:

  • Income: A lender will generally offer you a maximum of 4.5 times your household income. Do be aware that some lenders require that income to come from a job or position you’ve been in for at least 3 months, and that you’ve passed the probation period for.
  • Affordability: Lenders typically look at your spending and debts to assess how much you can afford to repay. Your debts include any student loan or “buy now pay later” arrangements as well as more traditional loans.
  • Credit Score: A good credit score may allow you to borrow more, sometimes at better interest rates. You can check your credit score for free through Experian.
  • Deposit Size: The size of your deposit affects how much you can borrow. You generally need at least a 5-10% deposit to get a mortgage. A deposit of over 10% means a lower Loan to Value (LTV) ratio, which gets you better interest rates.
  • Property Type: Lenders may require as much as a 25% deposit for new builds, and will generally require higher deposit percentages for leasehold properties than freehold ones.
  • Lender: Different lenders will be willing to lend different amounts to the same person, so it’s worth shopping around to see what you can get!

You might not want to borrow the maximum mortgage that you can get, as that comes with risks.

Do also remember that you’ll have to pay for other costs during the house buying process, such as legal costs, survey costs, and Stamp Duty. You may also have to pay mortgage fees in advance, which we’ll talk about more below.


How to choose a mortgage

An adventurer deciding between two mortgage options

The key things to think about when choosing a mortgage are how long it’s paid back over, the interest rate, whether it is a fixed or variable rate mortgage and any upfront fees. We explain what all these terms mean and the impact of different choices below:

  • Mortgages are paid off over a number of years, called terms. In the UK they typically range from 25 to 40 years, but they can be shorter.
  • Shorter mortgage lengths typically have higher monthly payments, but you’d pay less interest, so you’d pay the bank less in total.
  • Longer mortgage lengths have lower monthly payments which makes them more affordable, but you’ll end up paying more interest over the life of the loan, so you’d pay the bank more in total.
  • Not everyone can get long mortgage terms. That’s because most lenders will only let you pay off a mortgage until you’re 70-80 years old. At that point, they’re worried you might die, or might not be able to afford to pay your mortgage out of your pension.

  • Lenders make money by charging interest on mortgages, which can be a substantial cost over the length of the mortgage.
  • For example, if a £250,000 mortgage paid off over 25 years has a 5% interest rate, the total amount paid over the 25 years will be nearly £440,000 (£190,000 of which is interest).
  • This interest rate affects the monthly repayment amount. A higher rate means higher monthly payments.
  • For example, taking the same mortgage as above, the monthly repayments would be approximately £1,460. If the interest rate halved to 2.5%, the monthly repayments would be approximately £1,120.
  • Remember, you need to consider mortgage fees as well as interest rates. The lowest interest rate mortgages often have the highest fees, so in total you may end up paying the same or even more than for higher interest mortgages.

  • Many lenders charge fees to organise your mortgage, but some will charge zero fees.
  • The lowest interest rate mortgages often have high fees to compensate, so make sure you read the terms carefully!
  • These fees can include arrangement fees, booking fees, valuation fees, and other fees.
  • The average fees are about £1,000, but can vary from £0 to £2,500+.
  • The biggest fee is normally the arrangement fee, and this can often be added onto your mortgage instead of being paid upfront. But, do be aware that you’ll be charged interest on this fee if you add it onto your mortgage.

  • Mortgages can have fixed rates, where the interest rate remains the same over a number of years. Or, they can have variable rates, which can change in relation to the Bank of England's base rate.
  • Most people start on a fixed rate mortgage, because fixed rates tend to be lower than variable rates at the point you apply for a mortgage.
  • You can typically fix a mortgage for 1-10 years, after which you will either need to remortgage, or move onto a variable rate mortgage.
  • The downside of a fixed rate mortgage are that you’ll have to pay big early repayment charges if you need to move or sell within a fixed rate period, unless you can port the mortgage.

You have a decision to make on how long you want to fix the mortgage for.

  • You might want to fix for a long time if you’re not planning to move again soon, and you prefer the stability of knowing what your mortgage payments will be for many years to come.
  • You might want to fix for a shorter time if you might move or sell within a few years, might add a partner to the mortgage, or think the mortgage rates will come down in a few years.

Other things to look for in a mortgage

A magical scroll in a library with text indicating different mortgage options

Alongside the length, interest rate, fees, and fixed period, there are other things that you should look at when you are researching deals to make sure the mortgage is best for you.

Here are some things to consider:

  • You may end up needing to sell your home before the end of the fixed-rate or introductory period of your mortgage.
  • Paying off a mortgage early can incur charges, particularly if it's during a fixed-rate period.
  • These early repayment charges can be up to 5% of the outstanding loan, so can be very large. Make sure you check what these charges are.
  • Even outside the fixed-rate period, some mortgages have additional exit fees of £75-300 (sometimes called deeds release fees), so check for those.

  • If you move house before you’ve paid off your mortgage, you may want to transfer your existing mortgage to your new property. This process is called porting.
  • Porting can be particularly useful if you’re on a fixed rate mortgage and want to avoid early repayment charges, or want to keep your fixed interest rate when you move.
  • Not all mortgages are portable, so check the terms of any mortgages you’re interested in.
  • Do be aware that there are also situations where a mortgage can’t be ported. These include if you’re buying or selling a Shared Ownership property, or if you’re adding a partner to the mortgage.
  • If your chosen mortgage isn't portable, you might want to consider fixing the mortgage for a shorter period of time, to avoid early repayment charges if you move.

  • Once you’ve bought your home and are paying your mortgage, some lenders allow you to pay more than the monthly mortgage payment they require. This is called “overpaying”.
  • Lenders typically let you overpay each year by up to 10% of the total amount you still owe them, but you should check the terms of the mortgage you’re interested in.
  • While paying more might not sound like a good thing, overpaying can be a sensible thing to consider if you have spare cash.
  • That’s because the sooner you pay the bank back, the less interest you’ll pay to them overall.
  • However, overpaying isn’t always the best choice. You should consider whether the interest you’d save by overpaying is better than the returns you’d get from investing your money somewhere else, such as a high interest savings account.

  • Insurance: You might be required to purchase life insurance or buildings insurance as part of your mortgage agreement.
  • Specialist surveys: The lender might require you to get a specialist survey of the property for an issue such as damp.
  • Restrictions: A residential mortgage won’t generally let you rent out your property, which can be an issue if you need to move for work. Some mortgages even require you to ask permission before getting a lodger.

It's sensible to seek independent financial advice, for example by talking to a mortgage broker, to find the best mortgage option for your specific situation. Think carefully before securing other debts against your home. Your home may be repossessed if you do not keep up repayments on your mortgage or any other debt secured on it.

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