Second home mortgages

Own use versus letting, the line that decides everything

If you and your family will use the property and nobody pays rent, it is a second home and the mortgage is a residential one. If the plan is to let it commercially for holiday weeks, it is a holiday let and needs a holiday-let mortgage, underwritten differently and usually unregulated, like most buy-to-let lending. Some second-home products tolerate occasional letting; most do not, and using a residential second-home product to run a letting business is a breach of mortgage conditions. Tell us the real plan and we will match the product to it, not the other way round.

Affordability with two mortgages

Lenders assess the new loan with your existing mortgage payment treated as a committed outgoing, alongside the running costs of two homes: two lots of council tax, energy, insurance and upkeep. Your income has to carry all of it with the new loan stress-tested at a higher rate. Deposits on second homes typically run from 15% to 25% depending on the lender, and many lenders price second homes at or near standard residential rates. The constraint is usually affordability, not rate.

The SDLT additional-property surcharge

Buying an additional residential property attracts the SDLT additional-property surcharge of 5%, charged on the full purchase price on top of the standard bands. On a £300,000 second home, the surcharge alone adds £15,000 to the standard SDLT bill. There is no refund route for a genuine second home (the refund rules apply to replacing your main residence, which this is not). It is the single biggest cost most second-home buyers underestimate, so we put the all-in figure in front of you before you offer. Worth knowing too: many councils in England and Wales now charge a council tax premium on second homes, in some cases up to double the standard bill. Budget it into the running costs.

Worked example, £280,000 second home

Household income £95,000, existing mortgage £210,000 outstanding at £1,350 a month. Buying a £280,000 second home with a 25% deposit (£70,000), new loan £210,000. The lender deducts the existing £1,350 commitment and both sets of running costs, then stresses the new loan at an above-pay-rate figure. On these numbers the case typically works with mainstream second-home lenders, but the margin depends on the detail of outgoings, which is exactly what we model on the first call. Add SDLT: the 5% surcharge on £280,000 is £14,000 on top of the standard bill, so the true cash needed is the deposit plus comfortably over £15,000 of tax and costs.

Holiday lets, the different route

If the plan is income, the case moves to a holiday-let mortgage. These are assessed wholly or partly on projected letting income; many lenders take an average of low, mid and high season weekly rates from a recognised holiday-letting agent, and some apply an interest cover test similar to the ICR (Interest Cover Ratio) used in buy-to-let. Deposits typically start at 25%. Most holiday-let products allow you a set number of personal-use weeks, so the family still gets the place for part of the year. The regulatory framing is different though, see the note below.

Buying for family to live in

A property a parent or adult child lives in rent-free fits several lenders as a second home. The moment rent changes hands, it becomes a regulated family letting arrangement on a much narrower lender pool. The structure has to match the reality, so tell us the actual arrangement up front.

Common pitfalls we see

Buying on a second-home product and then listing the property on a holiday platform (a conditions breach the lender can act on). Forgetting the 5% surcharge until the solicitor asks for it. Underestimating two complete sets of running costs, including a possible council tax premium. Assuming the SDLT refund rules help when they only apply to replacing a main residence. We deal with all four before you commit.

Holiday-let and buy-to-let warning

Most holiday-let mortgages, like most buy-to-let mortgages, are not regulated by the Financial Conduct Authority. Consumer protections that apply to a residential mortgage do not all apply here. We still treat the case with the same care, but you should know the regulatory framing is different.