An 'existing relationship' with a bank or building society is the joint-most important factor when it comes to choosing a mortgage provider, Which? research shows.
A quarter of mortgage-holders (24%) told us they opted for their lender as they already had other financial products, such as a current or savings account, with them.
But does brand loyalty pay when it comes to applying for a mortgage?
We asked the UK's biggest mortgage lenders whether they offer better rates to existing customers - read on to find out what they told us.
How mortgage-holders choose which lender to go with
Perhaps surprisingly, having an existing relationship with a lender was just as popular a reason as the size of monthly repayments (also 24%) in our survey. Respondents could give multiple answers, which is why the percentages total more than 100.
Source: Which? survey of 2,313 mortgage-holders conducted in July 2023
Does loyalty pay when it comes to mortgage rates?
We asked 15 of the UK's largest mortgage lenders whether they offer cheaper mortgage rates to customers who already have a current or savings account with them, but not a mortgage.
Only one provider - Virgin Money - told us that existing banking customers can gain access to cheaper mortgage rates than applicants who don't hold other products with it. Meanwhile Barclays and Yorkshire Building Society said they offer cashback incentives to current customers.
Virgin Money
Virgin Money told us customers can benefit if they already have a current account with the bank.
A spokesperson told Which?: 'Our Current Account Reward Mortgages offer lower rate mortgage options to our current account customers compared with our core mortgage range.'
Yorkshire Building Society
Members of Yorkshire Building Society who've held a YBS savings account for at least 12 months can gain access to the building society's loyalty cashback range. This enables them to earn an additional £250 cashback on top of any cashback which already comes with a product.
To be eligible, they must not have a current mortgage with the building society, and need to live in the UK.
The offer also applies to family and friends, so savers who qualify but don’t need a mortgage themselves can pass on the benefit to someone who does, using a single-use loyalty code.
Barclays
The UK's fifth largest mortgage lender told us that members of its Blue Rewards scheme can get £3 cashback per month if they take out a Barclays mortgage.
What did other lenders say?
HSBC, Leeds Building Society, Nationwide, Santander, Skipton Building Society and TSB all told us they don't offer preferential rates to existing banking customers.
Co-operative Bank, Coventry Building Society, Halifax, Lloyds Bank and NatWest didn't respond to our request for information.
Clearly, in most scenarios, mortgage applicants' loyalty to their bank is misplaced when it comes to getting a good mortgage rate - so always shop around when looking for a mortgage, and talk to a mortgage broker if you want personalised advice on the best product for you.
Which? advice on getting a mortgage
If you're looking to get a mortgage and don't know where to begin, we're here to help.
Our comprehensive mortgage guides provide advice on everything from saving for a deposit to finding the best deal and applying for a mortgage.
If you're not sure where to start with comparing mortgages, it's worth taking advice from a whole-of-market mortgage broker, who can analyse all of the deals available to find the right one for you.
To get an idea of the best deals currently available, check out our guide on the best mortgage rates, which lists the best deals for first-time buyers, home movers and people who are remortgaging on their existing property.
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