Securing development finance is often one of the biggest challenges property developers face. While many developers focus on loan-to-value (LTV) or loan-to-Gross Development Value (LTGDV), another factor can significantly influence how much funding is available: additional property security.
For experienced developers with investment properties, commercial assets or unencumbered land, additional security can create opportunities that may not otherwise be possible. It can help unlock larger facilities, preserve working capital and provide greater flexibility when structuring development projects.
In this guide, we explore how additional property security works, when it may be appropriate, the benefits and risks involved, and how specialist lenders like Onyx assess these transactions.
What is additional property security?
Additional property security is exactly what it sounds like.
Alongside taking security over the development site itself, a lender may also take legal charges over other properties owned by the borrower or connected parties.
These additional assets effectively strengthen the lender’s overall security position.
Examples include:
Residential investment properties.
Commercial premises.
Industrial units.
Development sites.
Mixed-use buildings.
Unencumbered land.
Depending on the lender and the circumstances, these assets may be charged alongside the main development site to support a larger borrowing requirement.
Why do lenders ask for additional security?
Every development finance lender is trying to balance opportunity with risk.
Sometimes a project is attractive, but the numbers do not quite fit within standard lending parameters.
This could be because:
The borrower wants to maximise leverage.
Build costs are unusually high.
The purchase price is relatively expensive.
Planning has only recently been granted.
The project is more complex than average.
The developer wants to preserve cash for future opportunities.
Rather than reducing the loan size, additional security may allow the lender to become more comfortable with the overall transaction.
How additional security can increase borrowing capacity
Imagine a developer identifies an excellent development opportunity but wishes to minimise the amount of cash tied up in the project.
Without additional security, the lender may only be prepared to lend up to its standard lending limits.
However, if the developer owns another property with significant available equity, offering that property as additional security may enable a larger overall facility.
This can reduce the amount of capital the developer needs to contribute, allowing cash to remain available for:
Professional fees.
Unexpected costs.
Future acquisitions.
Working capital.
Other developments running simultaneously.
For experienced developers managing multiple schemes, maintaining liquidity is often just as important as securing the finance itself.
Not all equity is equal
Many developers assume that if they have equity in another property, a lender will automatically lend against it.
In reality, underwriters look much deeper.
They will typically consider:
Current market value.
Existing mortgages.
Available equity.
Property type.
Marketability.
Location.
Ownership structure.
Existing legal charges.
A residential investment property in a strong market may be viewed differently to specialist commercial premises or agricultural land.
Similarly, a property with a substantial existing mortgage provides less usable security than an unencumbered asset.
First charge or second charge?
The ranking of security is another important consideration.
A first legal charge gives the lender first claim over the property should enforcement ever become necessary.
A second legal charge sits behind an existing lender.
Both can be valuable, but naturally they offer different levels of protection.
Where second charges are involved, lenders will usually calculate the available equity after allowing for the existing first mortgage.
This remaining equity is what contributes towards the overall security package.
Does additional security replace a good project?
No.
This is a common misconception.
Additional property security does not compensate for an unviable development.
A lender will still assess:
The planning position.
Development appraisal.
Build costs.
Developer experience.
Exit strategy.
Market demand.
Professional team.
The project itself must still stand on its own merits.
Additional security simply strengthens the overall proposition.
Preserving cash for future opportunities
One of the biggest advantages of additional security is flexibility.
Many experienced developers do not want all of their available capital tied up in a single project.
Instead, they prefer to recycle capital across multiple opportunities.
For example:
Rather than investing several hundred thousand pounds of additional equity into one development, a developer may offer another property as security instead.
This can leave cash available for:
Deposits on future acquisitions.
Planning applications.
Professional fees.
Refurbishment projects.
Business growth.
For developers looking to scale their portfolio, preserving liquidity can become a major competitive advantage.
Additional security can support more complex projects
Not every development follows a straightforward path.
Some schemes involve:
Phased developments.
Commercial conversions.
Mixed-use properties.
Listed buildings.
Brownfield regeneration.
Multiple titles.
These projects often require more detailed underwriting.
Where appropriate, additional security can provide greater comfort during more complex transactions.
Every case is different, but a stronger overall security package can sometimes make more ambitious projects achievable.
The importance of realistic valuations
The value of any additional property should always be based on realistic assumptions.
Professional valuations play a key role.
Lenders are interested in:
Open market value.
Existing debt.
Available equity.
Marketability.
Any legal restrictions.
Occupancy.
Lease terms.
Inflated expectations rarely help.
Providing accurate information from the outset generally leads to faster credit decisions.
Ownership matters
The ownership of additional security is another area that receives close attention.
Questions may include:
Is the property owned personally?
Is it owned by a limited company?
Is there a trust involved?
Are there multiple owners?
Are guarantees required?
These considerations can influence both legal documentation and underwriting.
Discussing ownership structures with solicitors early in the process can often prevent delays later.
Understanding cross-collateralisation
When multiple properties secure a single loan, the arrangement is often referred to as cross-collateralisation.
While this can increase borrowing capacity, developers should understand the implications.
For example:
Multiple properties may remain charged until the loan is repaid.
Releasing individual properties may require lender consent.
Partial redemptions may need to meet agreed conditions.
These matters should always be understood before entering into the facility.
Every lender approaches additional security differently
There is no universal approach.
Some lenders prefer simple first-charge development facilities only.
Others are comfortable considering additional security where it strengthens the transaction.
This is why choosing the right lender is so important.
Understanding a lender’s appetite before submitting an application can save significant time.
Preparing a stronger funding proposal
Developers seeking to utilise additional security should prepare a comprehensive funding pack.
Helpful information includes:
Property addresses.
Current valuations.
Mortgage statements.
Asset and liability statement.
Land Registry details.
Ownership information.
Development appraisal.
Planning documentation.
Exit strategy.
The more complete the information, the easier it becomes for underwriters to assess the overall proposal.
Common misconceptions
“More security guarantees approval.”
Not necessarily.
The underlying development still needs to be commercially viable.
“Every lender values additional security in the same way.”
Each lender has its own underwriting policy and appetite for risk.
“Additional security always means higher borrowing.”
It may improve flexibility, but the final facility will always depend on the overall strength of the transaction.
“Offering another property is always the best option.”
Sometimes contributing additional equity is more appropriate.
The right structure depends on the developer’s objectives, available assets and long-term strategy.
Why developers should think strategically
Successful developers often view their property portfolio as a whole rather than focusing on individual assets.
A well-structured funding package can:
Support multiple developments.
Preserve liquidity.
Improve borrowing flexibility.
Accelerate portfolio growth.
This strategic approach is one reason why experienced developers often scale more quickly than those relying solely on cash contributions.
How Onyx supports developers
At Onyx, we recognise that every development opportunity is different.
Some borrowers simply require a straightforward development finance facility secured against the development site itself.
Others have wider property portfolios that may provide additional flexibility when structuring funding.
Where appropriate, we are happy to consider additional property security as part of the overall transaction. This allows us to take a pragmatic view of each proposal rather than relying solely on standard lending metrics.
Our experienced team works closely with developers, brokers and professional advisers to understand the wider picture and structure facilities that support both the immediate project and the developer’s longer-term objectives.
Whether you’re funding a ground-up residential development, refurbishment, conversion or more complex scheme, we aim to provide commercial solutions tailored to each opportunity.
Final thoughts
Additional property security can be a valuable tool for experienced property developers looking to maximise borrowing capacity and preserve working capital.
While it is not a substitute for a well-planned development, it can strengthen an already attractive proposal and provide lenders with additional confidence when assessing more complex transactions.
Every lender has a different approach, and every project deserves to be assessed on its own merits.
If you own additional property assets and are planning your next development, speaking to a specialist lender early in the process can help identify the most appropriate funding structure.
At Onyx, we regularly work with developers to structure development finance and bridging facilities that reflect the full strength of their property portfolio, helping borrowers unlock opportunities while maintaining the flexibility needed to continue growing their businesses.
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