The UK housing market has seen dramatic shifts in how people access property ownership in recent years. With rising property prices, the concept of sharing property ownership has grown in popularity, offering new pathways for individuals to step onto the property ladder. One of the key legal mechanisms that supports this form of joint ownership is the deed of trust, particularly when buyers are purchasing a share of a property rather than the entire title. Understanding how mortgages function within this framework is critical to managing expectations, financial responsibilities and legal protections for all parties involved.

What is a Deed of Trust and How Does It Work?

A deed of trust, also known as a declaration of trust, is a legally binding document that outlines the financial arrangements between two or more parties who jointly own a property. It is commonly used when people are buying a property together but contributing different amounts towards the deposit, mortgage payments, or ongoing maintenance costs.

For example, if two friends decide to buy a home together, but one contributes 70% to the deposit and the other 30%, a deed of trust can formally record this imbalance. This ensures that each owner’s share of the property—and any future profits or liabilities—is fairly reflected according to their contributions. The deed of trust also outlines what happens if one party wants to sell their share, or what occurs in the event of a dispute.

In the context of mortgages, this arrangement becomes more nuanced. A mortgage lender will want reassurance that the loan is secured against the proportion of ownership the borrower holds, and this must be clearly articulated within the deed of trust and through associated legal documents.

Buying a Share of a Property: The Modern Landscape

Traditionally, buying a home meant purchasing the entire freehold or leasehold, typically with a partner or as a sole buyer. However, with property prices continuing to outpace income growth in many areas of the UK, alternative ownership models have become more commonplace.

People are now increasingly opting to pool resources with friends, family members, or even unfamiliar co-investors to buy a share of a property. Shared ownership schemes offered by housing associations are another method, although these operate differently from private arrangements, which tend to require custom legal agreements like a deed of trust.

This kind of fractional ownership allows individuals to gain equity in a property without shouldering the full financial burden of ownership. However, it also brings with it a level of legal and financial complexity that is not present in sole ownership or traditional co-buying arrangements.

Securing a Mortgage for a Shared Ownership Arrangement

Most high street lenders prefer to lend to individuals who are purchasing entire properties on their own or with one co-borrower, both of whom will typically own the property as joint tenants or tenants in common. When prospective buyers enter into a deed of trust arrangement, particularly one involving unequal shares or multiple parties, the mortgage application process becomes more complex.

There are a couple of primary options when it comes to securing a mortgage in this context:

1. Joint Mortgage, Single Title: In this scenario, two or more parties apply jointly for a mortgage and are equally responsible for repayment. The legal title of the property is registered in all of their names. However, a deed of trust can still be used to record individual shares of ownership, especially if contributions are unequal.

2. Sole Mortgage, Trust-Based Ownership: One person takes out the mortgage in their name alone, but the property is owned (in equity) by multiple people according to the deed of trust. This is often arranged when one party has better credit or income and can secure more favourable lending terms. However, it exposes the sole mortgage holder to more risk, as they bear full responsibility for repayments even if others share in the property’s equity.

Mortgage lenders will typically require full transparency about the structure of ownership and will need to assess whether the arrangement poses additional legal or financial risks. Specialist mortgage brokers can be invaluable in these situations, as can seeking early legal advice when drafting the deed of trust.

Legal Considerations and Structuring the Agreement

The deed of trust is the cornerstone that supports this type of co-ownership. Its legal robustness is essential to ensure that each party’s interest is protected, especially where one or more of them has taken out a mortgage. The document should be drafted or reviewed by a solicitor who specialises in property law and is familiar with shared financing models.

Several key elements should be addressed in the deed of trust:

– Ownership percentages: This outlines who owns what share and how this relates to contributions towards the deposit, mortgage, and other costs.

– Exit strategy: A vital inclusion is a clause detailing the process if one party wants to sell their share. This might include offering the share to existing owners at market value before selling externally.

– Ongoing costs: How will bills, repairs, maintenance, and insurance be paid? Shares in these costs may mirror ownership proportions, or a different arrangement can be agreed upon.

– Surplus proceeds and liabilities: Upon sale, how are the proceeds or debts divided? The deed should specify how profits—or any losses—are distributed.

The deed should be clear about the parties’ intentions and should be registered against the title of the property with the Land Registry where applicable.

Impact on Mortgage Offers and Lenders’ Assessments

Lenders take a cautious approach to unconventional ownership structures. Each party’s financial situation, credit history and income are closely scrutinised. When multiple people are applying for a joint mortgage, all parties are “jointly and severally liable,” meaning each party is legally responsible for the full mortgage repayment in the event the other(s) cannot pay.

This can be a double-edged sword. On the one hand, combining incomes can lead to borrowing a larger sum. On the other, if one party defaults or experiences significant financial hardship, the others must cover their obligations.

Some lenders are more flexible than others, especially those with experience in managing mortgages for co-buyers or complex ownership arrangements. The presence of a well-documented and legally-binding deed of trust can provide additional reassurance to a lender that the arrangement is properly thought through and managed. Importantly, however, the deed of trust does not override a lender’s rights. In the event of mortgage default, the lender could enforce a sale of the property to recover the debt, regardless of the individual ownership percentages outlined in the deed.

Risks and Disputes: Planning for the Unexpected

When buying into a property with others under a deed of trust, it’s easy to operate under the assumption that all will go smoothly indefinitely. However, real life frequently poses challenges, and preparing for potential disputes or financial difficulties from the outset can save significant time, money, and stress down the line.

One of the key risks is default on the mortgage. If one co-owner loses their income and cannot contribute, the other owners must bear the financial strain or risk repossession. Another common issue arises when one party wishes to exit the arrangement—perhaps selling their share to move elsewhere—while others want to retain the property.

A well-structured deed of trust should provide step-by-step guidance for what happens in these situations. Common solutions include allowing the remaining owner(s) to buy out the departing party at a pre-agreed valuation method or setting a time limit within which to find a buyer externally.

In the case of a relationship breakdown or dispute between friends or siblings, clear documentation becomes even more critical. Legal mediation may be required if parties cannot agree on how to proceed, and in extreme circumstances, court proceedings may ensue to enforce sales or repayment obligations.

Tax and Stamp Duty Implications

When buying a share in a property, particularly outside of formal shared ownership schemes, understanding the tax implications is essential. If the share being purchased exceeds £250,000 (or £425,000 for first-time buyers under specific criteria), Stamp Duty Land Tax (SDLT) may be payable.

Importantly, SDLT is calculated not on the value of the whole property, but on the share being purchased. If one person buys a 30% share of a £400,000 property, their SDLT liability applies only to the £120,000 value of their share.

Capital Gains Tax (CGT) considerations arise in the future if a party sells their share and has made a profit—particularly if the property was not their primary residence. Keeping accurate records of contributions, improvements made, and sales value is necessary for tax reporting and compliance purposes.

Insurance and Property Maintenance Responsibilities

Another vital consideration when entering into a deed of trust is ensuring appropriate insurance coverage is in place. Buildings insurance must typically be recognised by the mortgage lender, and all owners should be co-policyholders. Contents insurance might be held separately by each party, especially if different parts of the home are used exclusively.

Responsibility for repairs and maintenance should be outlined in the deed, including decision-making processes about undivided ownership elements—such as the roof or communal living spaces. Failing to agree clearly on these responsibilities can lead to disputes, particularly when costly repairs are required.

The Role of a Solicitor and Mortgage Broker

Given the legal and financial complexities involved in buying a share of a property through a deed of trust, seeking professional guidance is not merely advisable—it is essential. A solicitor can ensure that the agreement is robust and fair to all parties, and that it complies with regulations and mortgage lending criteria.

Mortgage brokers experienced in shared ownership and co-buying can vastly simplify the process, helping buyers identify lenders who are prepared to offer loans under such arrangements. They can also support negotiations with lenders and make the application process smoother.

Choosing solicitors and brokers with proven experience in this niche area of property law and finance can be the difference between a successful transaction and one mired in complications.

Conclusion: Realising Co-Ownership Ambitions With Clarity and Confidence

Buying a share of a property under a deed of trust can be an effective route onto the housing ladder, especially in a high-cost market like the UK. It offers flexibility, shared financial responsibility, and a way to reflect unequal contributions fairly. However, it also requires careful planning, watertight legal agreements, and an awareness of the risks involved.

By working with experienced solicitors and mortgage brokers, being transparent with lenders, and agreeing on clear terms from the outset, co-owners can protect their interests and avoid future disputes. With the right structure in place, shared property ownership can deliver both financial and personal rewards — turning a complex arrangement into a practical, empowering step towards home ownership.