22 October 2025
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Understanding regulatory risks in home purchase plans vs. traditional regulated mortgage contracts

To The Point
(6 min read)

Home Purchase Plans (HPPs) are an alternative to traditional mortgage products, often structured to comply with Sharia principles. This article focuses on the ‘Diminishing Partnership Arrangement’ which is considered a HPP but is not the only type of HPP contract available. The use of HPPs is not limited to Islamic finance, and any business is able to make use of them by structuring transactions to fit within the rules. While HPPs share some similarities with Regulated Mortgage Contracts (RMCs), they also present unique regulatory risks. Below, we summarise key risks associated with HPPs and compare them to traditional RMCs under UK law.

Home Purchase Plans (HPPs) are an alternative to traditional mortgage products, often structured to comply with Sharia principles. This article focuses on the ‘Diminishing Partnership Arrangement’ which is considered a HPP but is not the only type of HPP contract available. The use of HPPs is not limited to Islamic finance, and any business is able to make use of them by structuring transactions to fit within the rules. While HPPs share some similarities with Regulated Mortgage Contracts (RMCs), they also present unique regulatory risks. Below, we summarise key risks associated with HPPs and compare them to traditional RMCs under UK law.

Diminishing Partnership Arrangement

Diminishing shared ownership (1) typically operates as follows: an individual (referred to as the "Eventual Owner") has the means to purchase 20% of a property outright but requires financing for the remaining 80%.

In a traditional mortgage arrangement, the buyer would borrow 80% of the property’s value from a financial institution and immediately hold 100% of the legal title, with the financial institution placing a charge on the property as security for the loan. 

By contrast, under a diminishing shared ownership model, the property is purchased jointly by the Eventual Owner and the financial institution, with the legal title usually held solely by the financial institution for security purposes and the individual holding a beneficial interest.

The Eventual Owner has exclusive rights to occupy the property but pays rent to the financial institution for the portion of the property it does not yet own. Over time, the Eventual Owner gradually buys out the financial institution’s share in stages, ultimately acquiring full ownership of the property.

Key regulatory risks in home purchase plans

1. Regulatory Scope
2. Enforceability Risks
3. Consumer Protections
4. Enforcement Challenges
5. Unfair Terms and Consumer Rights
6. Environmental and Landlord Liabilities

Stamp Duty Land Tax relief

One honourable mention in addition to the regulatory differences is that of Stamp Duty.

Without specific relief, there could potentially be three separate SDLT charges on the portion of the property that is financed under an HPP. The first charge would arise when the financial institution acquires the property. The second charge would occur when the financial institution leases its share of the property to the eventual owner. The third charge would apply when the eventual owner purchases the financial institution’s share of the property. By contrast, under an RMC, SDLT would only be payable once, at the time of the property purchase by the buyer.

Section 71A of the Finance Act 2003 provides relief from the second and third SDLT charges for HPPs in England and Wales, provided its specific conditions are satisfied putting it more in line with RMCs. 



(1) This should be distinguished from ‘Shared Ownership’ under the Housing and Regeneration Act 2008, which is a low-cost home ownership and a general government scheme to buy a share of a property from a housing association.

Next steps

If you would like to discuss anything raised in this article, feel free to contact our Regulated Lending and Banking team.

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