Second Home Mortgage FAQ
General information only. This is not financial or tax advice.
Last reviewed: 2026-06-06
Do I pay extra stamp duty on a second home?
Yes — in England and Northern Ireland, an additional 5% SDLT surcharge applies on top of standard residential rates when buying any additional property (increased from 3% to 5% in the Autumn Budget, effective 31 October 2024). Scotland charges an Additional Dwelling Supplement (ADS) on top of standard LBTT rates; Wales charges a higher LTT rate for additional properties. The surcharge applies from the first pound of the purchase price. If you sell your main home within 3 years of buying the second property, you may be eligible to reclaim the surcharge. First-time buyers buying a second property are not exempt.
How does lender affordability work when I have an existing mortgage?
Lenders assess both mortgages simultaneously. Your existing mortgage payment is treated as a committed expenditure, which significantly reduces the maximum loan available for the second home. Some lenders use the actual payment; others stress-test at a higher notional rate. If you intend to let your first property, some lenders will offset the rental income against the first mortgage — but this is not universal. Stronger income and significant equity in the first property both improve your position.
What is the difference between a second home and a buy-to-let mortgage?
A second home mortgage is for a property you will personally use — holiday home, weekend retreat, work base. It is assessed on your personal income. A buy-to-let mortgage is for a property rented to tenants and is primarily assessed on rental yield (rent must typically cover at least 125% of the mortgage payment at a stressed rate). You cannot use a second home mortgage on a property you intend to let — declaring personal use while letting is mortgage fraud.
What is consent to let and when do I need it?
Consent to let is a temporary permission from your residential lender to rent out a property that was purchased on a residential mortgage. It is commonly needed when circumstances change — moving in with a partner, relocating for work. Most lenders grant it for 12–24 months, often at an increased rate. It is not a long-term solution: if you plan to let the property permanently, you should remortgage to a buy-to-let product.
How much deposit do I need for a second home?
Most lenders require 15–25% deposit for a second home mortgage. Some will consider 10% in straightforward cases, but this is less common given the higher risk profile. A larger deposit helps where the income must service two mortgages. Common deposit sources include personal savings and equity released from the first property via remortgage.
Can I use equity from my first home as the deposit?
Yes — remortgaging your first property to release equity is a common way to fund a second home deposit. The increased first mortgage must be affordable alongside the new second home mortgage. Lenders treat released equity as a deposit (not borrowed funds in the context of the second application), which is generally acceptable. This works best where your first home has significant equity and your income comfortably supports both repayments.
Risk warning
Your home may be repossessed if you do not keep up repayments on your mortgage. Owning multiple properties creates additional financial commitments — always seek independent financial and tax advice before purchasing a second property.
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