Buying a Property With a Friend in the UK: Legal and Mortgage Considerations for Non-Romantic Co-Buyers

Buying a home with a friend, sibling, or colleague is no longer the unconventional choice it once was. With average UK house prices sitting above £285,000 and affordability stretched to breaking point in most cities, co-buying with someone you trust — but aren’t in a relationship with — has become a genuinely sensible financial strategy. But it comes with a distinct set of legal, mortgage, and practical complications that romantic couples rarely face in quite the same way.

Here’s what you need to know before you sign anything.

Joint Tenants vs Tenants in Common: The Decision That Matters Most

This is arguably the most important choice you’ll make as non-romantic co-buyers, and it’s one that too many people gloss over.

Joint tenants own the property equally and indivisibly. If one owner dies, their share automatically passes to the surviving owner — regardless of what their will says. For friends or colleagues, this is rarely appropriate.

Tenants in common is almost always the better option for non-romantic buyers. Each person owns a defined share of the property — which doesn’t have to be equal. If one of you contributes a larger deposit, you can reflect that in the ownership split: say 60/40 or 70/30. Each person can also leave their share to whoever they choose in their will.

Tip: Always instruct a solicitor to draw up a Declaration of Trust (sometimes called a Deed of Trust) alongside the conveyancing. This legally documents each person’s share, what happens if one party wants to sell, and how costs are split. It typically costs £200–£500 but is worth every penny.

Getting a Joint Mortgage as Friends: How Lenders Assess You

Most high-street lenders — including Barclays, NatWest, Halifax, and Nationwide — will lend to up to four people on a single mortgage. In practice, two buyers is the most common arrangement, and lenders will assess all applicants’ income, credit histories, and outgoings.

The upside is obvious: two salaries mean a higher borrowing ceiling. If you each earn £35,000, many lenders will offer 4–4.5x combined income, potentially putting £280,000–£315,000 within reach before your deposits are even factored in.

The downside is equally significant: joint and several liability. Each borrower is fully responsible for the entire mortgage, not just their share. If your co-buyer loses their job and can’t contribute, the lender will still expect the full monthly payment — and will chase both of you if it’s missed.

Key consideration: A missed mortgage payment affects both credit files. Make sure you have an honest conversation about financial resilience, emergency funds, and what happens if circumstances change before you apply.

What a Cohabitation Agreement (or “Co-Ownership Agreement”) Should Cover

For non-romantic buyers, a cohabitation agreement — more accurately called a co-ownership agreement in this context — is essential. Your solicitor can draft one alongside the Declaration of Trust, or as part of the same document. It should address:

• How ongoing costs are split — mortgage payments, buildings insurance, council tax, maintenance, and repairs
• What happens if one person wants to sell — does the other have a right of first refusal? How is a sale price agreed?
• What happens if one person wants to buy the other out — who commissions the valuation, and how is the buyout price calculated?
• What happens if one person can no longer pay — a defined process prevents panic decisions
• Rental income rules — if you ever let out a room, who receives the income and how is it declared to HMRC?

This document won’t be legally binding in exactly the same way as a contract in every scenario, but it provides a clear framework and significantly reduces the risk of costly disputes later.

Stamp Duty Land Tax (SDLT): What Co-Buyers Need to Know

As of 2025–2026, first-time buyers in England pay no SDLT on the first £300,000 of a property’s value, with 5% charged on the portion between £300,001 and £500,000. Above £500,000, the standard rates apply and the first-time buyer relief disappears entirely.

Here’s the catch for co-buyers: both parties must qualify as first-time buyers to access the relief. If your co-buyer has previously owned a property — even one they’ve since sold — neither of you will be eligible for the first-time buyer discount.

Example: If you’re a genuine first-time buyer purchasing with a friend who previously owned a flat, you’ll both pay standard SDLT rates. On a £350,000 purchase, that’s an extra £5,000 compared to what you’d pay as a solo first-time buyer.

This is worth verifying early. SDLT rules in Scotland (Land and Buildings Transaction Tax) and Wales (Land Transaction Tax) differ slightly, so check the relevant guidance if you’re buying outside England.

Help to Buy and Shared Ownership: Are They Available to Friends?

The original Help to Buy equity loan scheme closed to new applicants in 2023, so it’s no longer an option. However, the government-backed Mortgage Guarantee Scheme, which supports 95% LTV mortgages, remains available and can be used by co-buyers — though lenders set their own eligibility criteria.

Shared Ownership is more complex. Most shared ownership schemes are administered by housing associations and have specific eligibility rules around income caps (typically a household income below £80,000, or £90,000 in London). Friends can technically buy together through Shared Ownership, but you’ll both be assessed as a household, and both names will appear on the lease. It’s worth contacting the relevant housing association directly to confirm their policy.

The MoneyHelper service (moneyhelper.org.uk) is a free, impartial resource backed by the Money and Pensions Service, and is a good starting point for understanding your options before you speak to a broker.

Pros and Cons: Buying With a Friend vs Buying Alone

Buying with a friend: - ✅ Higher combined borrowing power - ✅ Shared deposit burden - ✅ Shared ongoing costs (mortgage, bills, maintenance) - ❌ Joint and several liability — you’re exposed to their financial behaviour - ❌ Complexity if one party’s circumstances change (relationship, job, relocation) - ❌ Additional legal costs for Declaration of Trust and co-ownership agreement - ❌ Potential SDLT complications if one buyer isn’t a first-time buyer

Buying alone: - ✅ Full control over the property and any future sale - ✅ No dependency on another person’s financial situation - ❌ Lower borrowing ceiling on a single income - ❌ Full deposit and monthly costs fall on you

The Bottom Line

Co-buying with a friend can be a financially astute move — but only if you approach it with the same rigour you’d apply to any major business arrangement. Get the legal documents right from day one, choose tenants in common, and have the difficult conversations about money before you exchange contracts. The cost of proper legal protection upfront is trivial compared to the cost of a dispute further down the line.

This article is for informational purposes only and does not constitute regulated financial or legal advice. Always consult a qualified solicitor and an FCA-authorised mortgage adviser before making property purchasing decisions.