Fixed vs. Floating Charges: How Security Structures Shape Commercial Property Financing
Article Summary
- Fixed and floating charges work differently, and understanding which assets fall under each structure determines your financing flexibility from day one.
- Crystallisation can occur before formal insolvency begins. The consequences for active property portfolios and development pipelines are immediate.
- An unregistered floating charge is void in insolvency, making registration status at Companies House one of the first things to verify when assessing a target company's security package.
What Is a Floating Charge in Commercial Property?
A floating charge is a security interest over a changing pool of assets.
When a lender takes security over your property business, they have two main tools: fixed charges and floating charges. A fixed charge locks onto a specific asset, like a named building.
A floating charge works differently. It floats over a shifting collateral base, such as rental receivables, work in progress on development sites, cash balances, and receivables from property sales not yet completed. The floating charge allows you to continue trading those assets without asking for the lender's permission each time.
This distinction matters more than most investors realise. The property ownership structure you use will directly affect how a lender applies a floating charge and what assets fall within its scope.
The charge floats until something goes wrong.
While your business is operating normally, the charge simply hovers in the background. You can sell properties, collect rent, and redeploy capital freely, with no lender involvement required. That operational freedom is the core appeal of a floating charge for portfolio investors and property businesses with assets that regularly move in and out of their holdings.
Floating charges sit alongside fixed charges in most financing structures.
In practice, lenders rarely rely on a floating charge alone. A typical commercial property financing package will include a fixed charge over identified, high-value assets registered at HM Land Registry, combined with a floating charge over everything else. Whether you hold assets as a freehold vs leasehold property will influence what ends up fixed-charged and what lands in the floating pool.
How Do Floating Charges Compare to Other Financing Structures?
Choosing between a commercial mortgage and a floating charge is a strategic decision, not just a financing one.
If your strategy centres on a single, long-hold asset, a commercial mortgage gives you predictable financing terms and a clean security structure, at the cost of operational flexibility. If you are running an active portfolio, cycling capital through acquisitions and disposals, or managing a development pipeline across multiple sites, a floating charge structure gives you the operational headroom to trade assets without constant lender consent.
The right structure depends on how your portfolio is positioned and how much operational control matters relative to cost of capital and recovery certainty.
| Financing Structure | Operational Flexibility | Lender Security | Typical Use Case |
|---|---|---|---|
| Commercial mortgage | Low | Very high | Single asset, long-term hold |
| Fixed charge debenture | Low to medium | High | Specific asset within corporate structure |
| Floating charge | High | Medium | Portfolio businesses, development pipelines |
| Combined fixed and floating | Medium | High | Most common in institutional lending |
What Triggers Crystallisation of a Floating Charge?
Crystallisation is the moment a floating charge converts into a fixed charge.
Until crystallisation happens, you can trade freely. Once it does, the floating charge locks onto whatever assets exist in the charged pool at that point in time. You lose the right to sell, transfer, or redeploy those assets without lender consent. For a property business mid-development or actively managing a portfolio, that can bring operations to a sharp halt.
The most common crystallisation triggers are:
- Loan default or breach of a financial covenant
- Appointment of a receiver or administrator
- The company ceasing to trade as a going concern
- Commencement of liquidation proceedings
- An automatic crystallisation clause written into the security document
Some lenders include automatic crystallisation provisions that trigger on default alone, without formal appointment or court action. These clauses are negotiable at the term sheet stage. Experienced investors should push back on broad drafting that could trigger crystallisation on a technical covenant breach rather than a genuine default event. Whether courts will enforce a given clause depends on the specific drafting, so ensure your legal team reviews and, where possible, narrows the trigger language before you sign.
Crystallisation does not always announce itself.
For instance, a covenant breach such as a loan-to-value ratio slipping below a threshold following a revaluation, can technically trigger crystallisation before any formal insolvency process begins.
If your leasehold commercial property assets are within the charged pool, tenant relationships, lease renewals, and rent collection could all fall under lender control almost overnight.
Monitor your covenants actively, not just at reporting dates, and put preparations in place to protect your position well before crystallisation triggers.
Protect your position before a crystallisation event.
| Preparation Step | Why It Matters |
|---|---|
| Map all assets in the floating charge pool | Know exactly what crystallises and what does not |
| Set internal covenant monitoring triggers | Catch breaches before the lender does |
| Identify critical operations that must continue | Prioritise what needs immediate protection |
| Prepare stakeholder communication templates | Tenants and partners need prompt, clear updates |
| Document asset ownership clearly | Speeds up any transition to receiver management |
How Does a Floating Charge Behave Across Your Asset Pool Over Time?
The charged pool shifts continuously, and your exposure shifts with it.
The floating charge pool does not stay fixed at the point of financing. As your portfolio evolves, so does what the charge covers, and that has direct implications for your financing capacity, your crystallisation exposure, and your due diligence when acquiring a company with existing security in place.
Illustrative example: how the charged pool shifts over a three-year hold period.
Consider a commercial property company that holds four assets within a corporate structure: two office buildings where the lender has registered fixed charges at HM Land Registry, and two industrial units, plus associated rental receivables and cash balances, sitting in the floating charge pool. At the point of financing, the floating pool covers approximately £8 million in assets.
During year one, the company sells one of the industrial units and uses the proceeds to begin a light refurbishment on the other. Both the sale proceeds held in the company account and the work in progress on the refurbishment are now within the floating charge pool. The pool has changed in composition, but the charge continues to float over whatever is there. The security document requires no amendment.
| Asset / Component | At Point of Financing | Year Three |
|---|---|---|
| Office buildings (x2) | Fixed charge, outside floating pool | Fixed charge, outside floating pool |
| Industrial units | 2 units in pool (~£8m total pool) | 1 refurbished unit in pool; 1 previously sold |
| Cash / sale proceeds | Cash balances in pool | Materially shifted; reflects trading activity |
| Rental receivables | Receivables in pool | Shifted entirely from original position |
| Work in progress | None | Completed; asset back in pool as income-producing |
What sits in the pool at crystallisation determines your exposure.
Because the pool is always changing, the assets you hold within it at any given moment determine how much operational control you stand to lose if crystallisation occurs. A portfolio that has recently sold its strongest assets and holds primarily cash and work in progress carries more crystallisation risk than one with fully let income-producing properties: there is simply less stable value in the pool for the charge to lock onto.
For investors and analysts assessing a target company's security package, understanding the current composition of the floating pool matters as much as knowing the headline charge exists. A floating charge registered at Companies House three years ago may cover a portfolio that bears little resemblance to the original asset base. Verify what is actually in the pool today, not just what was in it at the time of registration.
Key Takeaways
The flexibility of a floating charge during normal operations is a genuine advantage, but it is contingent on conditions staying stable. Portfolio investors and developers cycling capital through multiple properties can trade assets freely without restriction right up until crystallisation occurs, at which point that freedom disappears.
Investors who use floating charge structures most effectively map the full creditor priority stack before the deal closes, negotiate crystallisation trigger language at the term sheet stage, and monitor covenants actively throughout the hold period. Security structure is not a back-office detail. For leveraged acquisitions and portfolio financing, it is a core part of deal design.
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Frequently Asked Questions
How does a floating charge affect my ability to sell assets in my property portfolio?
Unlike a fixed charge, a floating charge lets you continue selling, leasing commercial property, or redeveloping properties within your portfolio during normal operations, and you do not need sign-off from your lender for each transaction. You retain operational control over the charged assets until a crystallisation event occurs. That said, your loan agreement may include covenants limiting certain transactions or requiring minimum portfolio values to be maintained, so always read the small print before assuming you have a free hand.
What happens to my property assets when a floating charge crystallises?
When crystallisation occurs, your floating charge immediately converts to a fixed charge over whatever assets exist at that point in time. The lender may appoint a receiver who takes control of those assets, stepping into your role as landlord and taking over ongoing development decisions. The best protection is prevention: active covenant monitoring and early lender engagement if your financial picture is deteriorating.
