Most development deals don’t fall apart because of build costs or planning delays, it’s usually the funding structure that causes problems. You reach a point where the senior lender simply won’t go any further, and that gap in the capital stack starts to dictate how the deal actually unfolds from that point on. This becomes even more important when comparing different funding routes, particularly when looking at options like commercial mortgages vs bridging finance.
Most UK development structures sit around 60–70% senior debt, with additional layers used to push leverage higher where needed.
How that gap is filled matters more than most people expect. It has a direct impact on cost, on how much control you keep, and on what you actually walk away with once everything is repaid and the deal exits. This is typically where mezzanine debt or preferred equity come into the picture, and although they can look quite similar at a high level, they behave very differently once you get into the detail.
In practice, it’s rarely a simple “which is cheaper” decision. It comes down to how confident you are in the exit, how much flexibility you need during the project, and whether you are prepared to trade some upside in return for reducing pressure elsewhere in the structure.
This guide breaks down how both options are used in UK property deals and where each one tends to make more sense depending on the situation.
Comparing mezzanine debt and preferred equity in a UK property finance deal
How the Capital Stack Actually Works in UK Property Deals
In most deals, the funding doesn’t come from one place, it’s layered. You’ll usually have a senior lender at the top providing the bulk of the debt, and they’re the cheapest money in the stack, but also the most conservative. Once they’ve hit their limit on leverage, that’s it, they won’t stretch just because the deal “almost works”.
That’s where the gap appears, and it’s usually not small. You either leave more of your own cash in, or you bring in another layer behind the senior lender to close it. That second layer is where mezzanine debt or preferred equity tends to sit, and although they’re both used to solve the same problem, they don’t behave the same way once the deal is live. This is also where lenders start to look more closely at risk and structure, which ties into how commercial mortgage lenders assess risk in practice.
Underneath all of that is your own equity, which is the first to take any hit if things go wrong, but also where most of the upside sits if the project performs. The way these layers are put together isn’t just a technical detail, it changes how risk is shared, how returns flow, and how much room you actually have if the deal starts to move off plan.
What Mezzanine Debt Actually Looks Like in a UK Deal
Mezzanine debt tends to come in once the senior lender has drawn a line and the numbers still don’t quite stack. It sits behind the senior loan, so it takes more risk, which is why the pricing is higher, but it allows you to push leverage further without bringing in another equity partner.
In practice, it’s not always as simple as just adding a second loan. Most mezz lenders will want either a second charge or a share pledge over the borrowing entity, and they will spend a lot of time looking at the exit because that’s ultimately how they get repaid. This is exactly the type of scenario covered in more detail in our guide to mezzanine finance in the UK.
If the exit isn’t clear, or the margin for error is too tight, they’ll either price for it heavily or step away altogether.
The cost is usually quoted as an annual rate, often somewhere in the low to mid-teens depending on the deal, but what really matters is how it’s structured. Some lenders will want monthly interest, others will allow it to roll up, and in a lot of cases there will be an exit fee or some form of profit participation layered in as well. That’s where the true cost starts to move beyond the headline rate.
From a control point of view, mezz lenders generally stay in the background while things are going to plan. They’re not looking to run the deal day to day, but they will have protections in place, and if the deal starts to drift or the senior lender becomes uncomfortable, that’s when their position becomes more active.
What Preferred Equity Looks Like in Practice
Preferred equity usually comes in when debt starts to feel too tight or the deal needs more flexibility than a lender will allow. It’s not a loan, so there’s no fixed repayment in the same way, which can ease pressure during the project, particularly where cash flow is uneven.
That flexibility comes at a cost. Investors are taking more risk, sitting behind the debt, so they’ll want a preferred return and often a share of the upside as well. On a good deal, that can end up being more expensive than it first looks.
The bigger difference is how involved they are. Preferred equity investors tend to act more like partners than lenders, with a say in key decisions because their return depends on how the numbers land in reality. That can be helpful in the right situation, but it also means giving up some control and not keeping all of the profit.
Mezzanine Debt vs Preferred Equity – Cost Differences
When you sit down with the numbers, mezzanine is usually the easier one to pin down. You’re given a rate, you can map it out, and you’ve got a decent idea where you’ll end up, even if it’s not exactly cheap. Most of the time there aren’t too many surprises, it’s just a question of whether the deal can carry it.
Preferred equity doesn’t behave like that. You might start with a target return that looks fine, but that’s not really the number that matters. If the deal performs well, the investor shares in that, so what it actually costs only becomes clear once everything is finished and the figures are final.
This is where most structuring decisions are made in practice. Mezzanine is more fixed, but it can feel heavier while the project is running. Preferred equity can give you a bit more breathing room along the way, but you’re giving something up on the back end and you don’t always feel it until later.
Some deals suit one, some the other. It usually comes down to how tight things are and how sure you are on the exit, rather than just trying to decide which one looks cheaper at the start. This is also closely linked to how affordability and deal viability are assessed through commercial mortgage stress testing.
Control and Decision Making – What Actually Changes
You don’t always notice the difference at the start, it tends to show up once the deal is moving and decisions need to be made. With mezzanine, the lender is there for the return, not to run the project, so as long as nothing is going off track, they generally stay out of the way.
They’re still protected though. If timings slip or the numbers start to move the wrong way, they won’t just sit back, and things can tighten quite quickly. But if the deal is doing what it’s supposed to do, you’re usually left to get on with it.
Preferred equity is a bit different in that sense. They’re closer to the outcome, so they’ll want visibility on the bigger decisions, and in some cases a say in them as well. It’s not constant involvement, but you’re not operating completely independently either.
Some people like that, especially on larger or more complex schemes, others would rather keep full control and deal with the trade-offs elsewhere. It’s less about right or wrong and more about how you want the deal to feel while it’s running.
Security Position – Who Sits Where When It Matters
This only really becomes a focus when something goes wrong, but it’s one of the most important differences between the two. Mezzanine sits behind the senior lender, so it’s not first in line, but it still has some form of security, often through a second charge or a share pledge over the borrowing entity.
That means if things start to unravel, they have a route to step in and protect their position, although they’re still relying on there being enough value left after the senior debt is cleared. It’s not a comfortable place to be, but it’s not unsecured either.
Preferred equity is further down the stack. There’s usually no direct security over the asset, so recovery depends on what’s left once all the debt has been repaid. In a strong deal that’s not an issue, but if values move or the exit doesn’t go to plan, that’s where the risk really shows.
This is why the pricing differs. One has some protection built in, the other is relying more on the deal performing, and that gap in security position is what drives the difference in how each is used.
Risk and Return – How Each Side Looks at It
If you look at it from the funding side, mezzanine is still about getting repaid first and foremost. The return is built around that expectation, so most of the focus goes into whether the numbers hold up and the exit feels realistic. It’s not low risk, but it’s not open-ended either.
Preferred equity is closer to backing the deal itself rather than just the loan. If it works, they do well, if it doesn’t, they feel it more. That’s why the return expectations are higher, because they’re further down and more exposed if things don’t land as planned.
From a developer point of view, the trade-off shows up in a different way. Mezzanine tends to make the deal feel tighter while it’s running, but whatever is left at the end is yours. Preferred equity can take some of that pressure off along the way, but you’re not keeping all of the result if it goes well.
There isn’t a single right answer. Some deals suit one approach more than the other, and it usually comes back to how strong the exit looks and what you’re more comfortable giving up to get there.
When Each One Tends to Make More Sense
Mezzanine usually comes into it when the deal is close but just doesn’t quite get there on senior debt alone. Nothing major is broken, it just needs a bit more behind it, and using another layer of debt keeps things simple enough without bringing someone else into the equity.
It also tends to be the route when the focus is on what’s left at the end. You take on more cost while it’s running, but if it lands where you expect, you’re not handing over part of the result, which is often the main reason people go that way.
Preferred equity tends to show up in deals that don’t feel as straightforward. That might be around timing, or how the cash flows, or just where the lender has stopped and there isn’t much room to push further. In those situations, something more flexible can make it easier to keep the deal moving.
Most of the time it isn’t a clean comparison. Some deals just need a bit more weight behind them, others need a bit more room while they play out, and that’s usually what ends up driving the decision.
A Simple Example – How the Structure Plays Out
Say it’s a £10m scheme. The main lender is in for roughly £6.5m. That still leaves a chunk to deal with, so the question isn’t whether the deal works, it’s how you choose to plug what’s missing.
One option is just adding more debt. For example, £1.5m at something like 13–15%. Over a year or so, you’re probably looking at a couple of hundred grand by the time it’s done. It sits there the whole time and gets cleared before anything comes back to you.
Do it with equity instead and it shifts. Same £1.5m, but now you’re talking something like a mid-teens return plus a slice of profit. If the deal only just works, the gap between the two isn’t huge. If it does well, that’s when it starts to move apart.
While you’re in the deal, the second option can take a bit of weight off. You’re not working back from a fixed figure in quite the same way. But you don’t really know where you land until the end, and that’s the trade.
That’s usually how people look at it. Not “which one is cheaper”, more what the deal is likely to do once it’s underway.
Final Thoughts – How to Think About It
In the end it usually comes back to how the deal is likely to behave once you’re actually in it. What looks fine at the start doesn’t always feel the same a few months down the line.
Some projects are straightforward enough that adding more debt isn’t a problem. You carry the cost, clear it at the end, and move on. Others don’t run as cleanly, and that’s where having something less rigid in the structure can make a difference.
There isn’t a perfect answer you can apply across every deal. It’s more a case of looking at what you’re dealing with in front of you and deciding what you’d rather live with while it plays out.
Frequently Asked Questions
Is mezzanine debt cheaper than preferred equity?
Most of the time it comes out lower, but it’s not always that clean once the deal plays out.
With mezzanine you can usually see the cost building as you go, so there’s less guesswork. Preferred equity is harder to pin down early on, because part of what the investor takes depends on how well things go, which can shift the outcome quite a bit by the time you exit.
Does preferred equity mean giving away ownership?
You’re not always handing over legal ownership, but you are sharing the result.
Even if you’re still the one running the deal, the investor is entitled to a slice of the profit, so the better it performs, the more that gets split rather than kept entirely by you.
Can mezzanine debt be used alongside bridging finance?
Yes, that combination comes up quite a lot on shorter-term deals.
A bridging lender will usually cap out at a certain level, and if the numbers still need a bit more to work, mezzanine is sometimes layered in behind it rather than bringing in equity.
Which option gives more control to the developer?
In most cases, mezzanine leaves you with more freedom while the deal is running.
As long as things are broadly on track, the lender isn’t usually getting involved in day-to-day decisions. With preferred equity, there’s often more visibility around key moments, especially where the outcome directly affects what they take out of the deal. .
Which is riskier, mezzanine debt or preferred equity?
If the deal doesn’t land how you expected, it’s the equity that tends to feel it first.
It sits at the bottom, so anything that knocks value gets absorbed there before it works its way up, whereas mezzanine still has something in front of it.
Can you use both mezzanine debt and preferred equity in the same deal?
You do see it now and again, but it’s not that common on straightforward schemes.
Once you start layering both in, the structure gets quite heavy, so it’s usually reserved for deals where the size or complexity justifies it.
Does mezzanine debt affect how much you can borrow from a senior lender?
Sometimes it does, but it’s not a fixed rule.
Some lenders are fine with it sitting behind them, others don’t like it at all, so it really depends who you’re dealing with and how the deal looks as a whole once it’s put together.
Is preferred equity only used on large development deals?
Not always, but you tend to see it more on bigger or less straightforward schemes.
On smaller deals it can feel like overcomplicating things, whereas on larger ones it can give the structure a bit more room to work.
Assessing costs and returns in a UK property finance structure
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If you’re working through a deal and trying to decide how to structure it, this is usually where getting a second view helps. Small changes in how the stack is put together can have a bigger impact than most people expect once the deal is underway.
We look at this day in, day out across development, investment and bridging transactions, so if you want to run through a scenario or sense-check an approach, we can talk it through with you.
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