3 Person Mortgage Calculator
Calculate joint mortgage affordability for three buyers. Estimate borrowing power, monthly repayments, and income multiples for trios buying property in the UK.
Joint Borrower Details
Enter the incomes, deposit, and mortgage terms for all three applicants
Gross annual income before tax.
Gross annual income before tax.
Gross annual income before tax.
Combined cash deposit from all buyers.
Length of the mortgage in years.
Annual interest rate (fixed or initial variable rate).
How many times your joint income the lender will offer (typically 4.0 to 4.5).
Borrowing Capacity
Estimated maximum mortgage and monthly costs
Enter the joint incomes and mortgage details above, then click Calculate Mortgage to see your combined borrowing power.
UK Joint Mortgage Benchmarks
Understanding typical lender criteria helps you set realistic expectations when applying for a multi-person mortgage in the UK.
| Mortgage Metric | Typical Range | Context / Details |
|---|---|---|
| Income Multiple | 4.0x – 4.5x | Most UK lenders multiply joint income by 4 to 4.5 to determine max loan. |
| Maximum Joint Buyers | 3 – 4 people | Some specialist lenders allow up to 4 joint borrowers, but 3 is more common. |
| Minimum Deposit | 5% – 10% | Standard requirement, though 10%+ secures better interest rates. |
| Maximum Term | 30 – 35 years | Must usually end before the oldest borrower reaches retirement age (65-75). |
| Joint Liability | 100% (Joint & Several) | All parties are fully responsible for the entire mortgage payment if others default. |
3 Person Mortgage FAQ
Everything you need to know about joint mortgages for three buyers, friends, or family members in the UK.
Yes, many UK lenders allow up to three (and sometimes four) people to take out a joint mortgage. This is increasingly popular among friends buying together or family members helping a first-time buyer. All applicants will be jointly and severally liable for the entire mortgage debt.
Lenders typically calculate borrowing capacity by adding all three applicants’ gross annual incomes together and applying an income multiple, usually between 4.0 and 4.5. For example, if three people earn £30,000 each (£90,000 combined), they could potentially borrow between £360,000 and £405,000.
Because of ‘joint and several liability’, a lender will not simply remove one person’s name. The remaining borrowers must prove they can afford the mortgage on their own (a process called ‘transfer of equity’). Alternatively, the property may need to be sold, or the departing party’s share bought out.
While there isn’t a specific “friend mortgage” product, many high-street and specialist lenders are now accustomed to joint applications from unrelated friends. It is highly recommended to draw up a legal agreement (a ‘Declaration of Trust’ or ‘Living Together Agreement’) to outline what happens if one person wants to sell or stops paying their share.
Yes. When you apply for a joint mortgage, your credit files become linked with the other borrowers. If any of the other parties miss a payment or default, it will negatively affect your credit score, even if you paid your share on time. Conversely, a well-managed joint mortgage can help build your credit history.