Mezzanine Finance for Property Development: Costs, Structure and When to Use It

Mezzanine Finance at a Glance

We cover mezzanine finance sits between senior debt and equity in the capital structure of a development project. It allows you to reduce the amount of equity you need to contribute — enabling larger projects or higher leverage — in exchange for a higher cost of capital on the mezzanine tranche.

When mezzanine finance makes sense:

• Your development margin is strong enough to absorb the higher cost of mezzanine finance
• You have multiple active projects and can’t tie up all your equity in one scheme
• The alternative is simply not doing the project — not a like-for-like comparison with all-equity funding

When mezzanine finance doesn’t make sense:

• The project margin is marginal — mezzanine cost can eliminate profit on thin-margin schemes
• Stretch senior debt is available at comparable leverage — one lender is simpler and usually cheaper
• You haven’t modelled the all-in funding cost (senior plus mezzanine) against projected returns

Where Mezzanine Sits in the Capital Stack

We describe a development project’s funding as typically has three layers, each with different cost and risk characteristics:

1. Senior debt — the first charge loan from your primary development finance lender. This is the cheapest money, advancing typically 60–75% of total project cost (LTC) at the lowest rate.
2. Mezzanine debt — a second charge loan sitting behind senior debt. Typically bridges the LTC from the senior limit (say 65%) up to 80–85% LTC. More expensive than senior debt because the lender ranks second in default.
3. Equity — your own contribution or third-party equity investors. The most expensive capital in terms of return demanded, but also where profit accrues.

We find mezzanine allows you to bring your equity requirement down from, say, 35% of project cost to 15–20%. On a £5m scheme, the difference between 35% and 15% equity is £1m — capital you can retain in your business or deploy on a second project running in parallel.

How Mezzanine Finance Works

We note that the mezzanine lender takes a second charge on the development site, sitting behind the senior lender’s first charge. This means the mezzanine lender can only recover their funds after the senior debt is repaid in full if the project defaults. That subordinated risk position is why mezzanine rates are higher.

We highlight that your senior lender must consent to the second charge before you draw mezzanine finance. In practice this is standard — most senior lenders are familiar with mezzanine stacks and consent is built in from the outset. We recommend confirming this at heads of terms, not at drawdown.

We find that mezzanine interest is typically rolled up rather than serviced monthly during the build. You don’t make monthly payments — instead, interest accrues and is repaid alongside the senior debt when you exit the project through sales proceeds or refinance.

Mezzanine Finance Costs

We’ve found that mezzanine finance is substantially more expensive than senior debt because the lender takes second-charge risk. Before committing, we recommend modelling the all-in funding cost across both tranches against your projected development margin.

Typical mezzanine cost structure:

• Monthly interest rate: 1.5–3%+ on the mezzanine tranche (versus 0.5–1% on typical senior debt)
• Arrangement fee: typically 2% of the mezzanine facility amount
• Exit fee: sometimes applicable — confirm before drawdown

We’d illustrate: on a £1m mezzanine facility at 2% per month over a 12-month build, interest alone is £240,000. Combined with a 2% arrangement fee (£20,000), your total mezzanine cost for that £1m runs to around £260,000 before exit fees.

We note this cost must be absorbed by the additional equity return the mezzanine enables. If your margin is 20% on GDV and the facility releases £1m for redeployment on a second project, the economic case is strong.

If your margin is 12% and the £1m isn’t being redeployed elsewhere, the numbers are harder to justify. We find marginal-return projects are where mezzanine finance is most often used inappropriately.

When Mezzanine Finance Makes Sense

We’d caution: mezzanine finance isn’t a catch-all solution for developers who are short of equity. The high cost of capital means you need a genuine reason why the leverage is worth paying for.

Strong Margin Projects

We find that on a scheme with a 25%+ development margin, your project can absorb the cost of mezzanine finance and still return meaningful equity profit. The mezzanine buys you leverage; the margin covers the cost of that leverage.

We’ve seen that on a scheme with a 12–15% margin, mezzanine cost can eliminate most of your profit. We find marginal-margin schemes are where mezzanine is most often proposed without modelling the impact on your net return — check the numbers before committing.

Multiple Active Projects

If you’re running two or three schemes simultaneously, mezzanine on each frees up equity to fund the others. The cost of mezzanine per project is more than offset by the return from deploying that released equity on the parallel schemes.

We see this as the strongest economic case for mezzanine finance — you aren’t just reducing equity on one project, you’re increasing your total project capacity.

When the Alternative Is Not Doing the Deal

We find that if the choice is between taking a project with mezzanine or not doing it at all, the comparison changes. Mezzanine at 2%/month on a £1m facility is expensive — but it’s better than losing access to a strong site because you’re £1m short of equity.

We find this is a different analysis from the case where you have the equity but want to reduce it. The relevant comparison is mezzanine cost versus opportunity cost of the missed project, not mezzanine cost versus alternative finance.

Senior/Mezzanine Stack vs Stretch Senior Debt

We examine an alternative to a two-lender capital stack is stretch senior debt — a single loan advancing to 80–85% LTC from one lender, without the complexity of a second charge.

We’d note stretch senior is typically cheaper — one set of fees, one lender. The trade-off is that stretch senior lenders price higher on the senior portion because overall leverage increases their risk. The right structure is whichever total cost works out lower on your specific project.

We recommend modelling both options explicitly rather than accepting the first structure your broker proposes. The right structure is whichever produces the better all-in cost on your capital stack, not the one that’s faster to arrange.

Finding a Mezzanine Finance Lender

We’ve found mezzanine development finance is provided by specialist private credit funds, family offices, and some development finance platforms. Not all senior development lenders work with mezzanine — some prefer to provide the full facility as stretch senior, others have established preferred mezzanine lender relationships.

We’d advise: the most practical route to finding a mezzanine lender is through a specialist development finance broker who works across both senior and mezzanine capital. We find that approaching senior and mezzanine separately, without a broker coordinating the two, is a common source of delay and mis-structured deals.

We recommend: confirm that your senior lender will consent to the second charge before you spend time negotiating mezzanine terms. A few senior lenders restrict which mezzanine lenders they will work with — this is a conversation to have at heads of terms, not at drawdown.

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