Letter of Intent vs. Heads of Terms: How They Compare in Commercial Property Transactions
Article Summary
- In the UK, the pre-contractual document used before a commercial lease is called heads of terms. In the US, the equivalent is a letter of intent.
- Neither document is usually legally binding, but certain clauses like exclusivity and confidentiality can carry real legal consequences.
- UK heads of terms emphasise repair obligations, while US LOIs prioritise rent escalations and tenant improvement allowances.
- Poorly drafted language can inadvertently create a binding contract, and over-negotiating at this stage can cost you leverage.
What Is a Letter of Intent in Commercial Property?
It is a pre-contractual document that records proposed deal terms before lawyers get involved.
If you have ever been handed a document before a lease or property purchase was finalised and wondered what exactly you were signing, you are not alone. A letter of intent (LOI) is a document that sets out the headline terms of a proposed transaction. It signals that both parties are serious about proceeding, and it creates a shared framework before solicitors start drafting the formal agreement.
In UK commercial property, you are far more likely to hear the term heads of terms than letter of intent. Both documents serve the same purpose: they are the deal on a page before the deal is done. The difference is largely one of geography and convention. Letter of intent is the standard term in the United States; heads of terms is the standard term in the UK.
If you are a tenant or investor with a US background, or you are working with American counterparties, knowing that these two terms are functionally equivalent will save you real confusion at the negotiating table.
LOIs and heads of terms are used across a range of commercial property transactions, from leasing office space or retail units to buying commercial property outright. The document you receive will vary in length and detail depending on the complexity of the deal, but the core purpose is always the same: to record what has been agreed in principle so that solicitors can turn the agreed terms into something legally enforceable.
How Does a Letter of Intent Compare to Heads of Terms?
Same purpose, different name, and a few structural differences worth knowing.
The clearest way to understand the relationship between these two documents is side by side.
| Letter of Intent (LOI) | Heads of Terms | |
|---|---|---|
| Common jurisdiction | United States | United Kingdom |
| Typical timing | Often earlier stage, before detailed negotiation | Once key commercial points are agreed |
| Format | Often in letter format | Structured like a contract summary |
| Common binding clauses | Confidentiality, exclusivity | Confidentiality, exclusivity (lock-out) |
| Leads to | Formal purchase or lease agreement | Formal lease or sale and purchase agreement |
In practice, many UK commercial property transactions use only heads of terms and skip the LOI stage entirely. Some use both. What matters is not the label on the document but what is inside it, and whether it clearly states which provisions are binding and which are not.
Are Letters of Intent and Heads of Terms Legally Binding?
Both documents are generally non-binding, but what you include determines how protected you are when it matters.
Heads of terms are not usually legally binding. To make that clear, they should always be marked subject to contract. The same applies to an LOI. However, certain clauses are typically intended to be binding regardless of the document's overall non-binding status, including confidentiality obligations, exclusivity or lock-out clauses, and confirmation of which legal jurisdiction governs the agreement.
The risk comes when a document is drafted carelessly. Under the Law of Property (Miscellaneous Provisions) Act 1989, a court could treat a heads of terms document as a binding contract if it is in writing, incorporates all expressly agreed terms, and both parties have signed it. As a rule of thumb, involve a solicitor before you sign rather than after. Once heads of terms are agreed and an exclusivity period is running, the leverage to renegotiate binding provisions is largely gone.
What Should an LOI or Heads of Terms Include?
Record the headline terms, identify what is binding, and make sure you have a clear exit route if the deal falls through.
A well-drafted heads of terms document covers the key commercial points: proposed rent or purchase price, repair obligations, break clause provisions, exclusivity period, conditions precedent, and confirmation of which clauses are binding and which are not.
A US letter of intent covers the same commercial ground, though some terminology differs. "Subject to contract" has no direct US equivalent; LOIs instead include language stating explicitly that the document is non-binding. On repair obligations, a UK heads of terms will typically specify whether the lease is to be on full repairing and insuring (FRI) terms, while a US LOI would reference a triple net (NNN) lease instead.
For UK buyers, a "subject to finance" condition provides a documented exit route if funding cannot be secured on acceptable terms. In the US, the equivalent is a financing contingency, which serves the same purpose within an LOI.
How Are LOIs and Heads of Terms Used?
In the UK, heads of terms set the commercial framework before contracts are drafted.
In a commercial lease negotiation, heads of terms are used to set out the proposed commercial terms before the full lease is drafted.
For a tenant, getting the key commercial terms recorded at this stage matters: it is much harder to renegotiate them once solicitors are involved and costs are mounting. This is particularly true for provisions like break clauses and rent reviews, which can have significant long-term financial consequences if parties do not clearly capture them upfront.
In a commercial property acquisition, heads of terms record the key deal terms between buyer and seller before solicitors are instructed. The buyer's main priority is securing exclusivity so that due diligence can proceed without the seller continuing to market the property.
In the US, a letter of intent serves the same purpose but with different mechanics.
In a commercial lease negotiation, a US tenant would use an LOI to agree similar headline terms, but the specific provisions differ. Rather than rent reviews, US commercial LOIs typically reference annual rent escalations, often tied to the Consumer Price Index or a fixed percentage increase.
Tenant improvement allowances, which are contributions from the landlord toward fitting out the space, are also a standard LOI provision in the US with no direct UK equivalent. In acquisitions, US buyers also typically encounter earnest money deposits at the LOI stage, a mechanism with no direct parallel in UK commercial property practice.
What Are the Risks of Signing an LOI or Heads of Terms?
The document may not be binding, but that does not mean it is without consequences.
The biggest risk is the misconception that "non-binding" means "no obligation." There are several ways signing an LOI or heads of terms can create problems if the document is not handled carefully.
The most serious is inadvertently creating a binding contract. Careful drafting is the only thing that prevents it. In the UK, the Court of Appeal confirmed in Pretoria Energy Company (Chittering) Ltd v Blankney Estates Ltd that the heads of terms document did not constitute a binding contract, but the outcome turned on precise wording: had the document not made clear that a separate formal agreement would be required, the result could have been very different. Courts scrutinise every word, and drafting details that seem minor at the time can determine the outcome.
In the US, a similar risk exists: a court can still hold a party liable if the other side spent money or took material steps based on promises in a non-binding LOI, making this risk as real on both sides of the Atlantic as it is in the UK. The classic commercial property scenario is a tenant who begins expensive fit-out work based on promises in a non-binding LOI, only for the landlord to back out and lease to someone else.
Over-negotiating at the heads of terms or LOI stage is a separate but common mistake. Attempting to resolve every commercial point before solicitors are instructed can consume disproportionate time, delay the transaction, and allow market conditions to shift against you. The document is meant to record the headline deal, not substitute for the lease or purchase agreement.
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Frequently Asked Questions
If I am a UK tenant, will I ever encounter a letter of intent?
It is unlikely in a standard leasing context. Heads of terms is the default term used by UK commercial property agents and solicitors. You may occasionally encounter the term letter of intent in construction or development contexts, but for a straightforward commercial lease or property acquisition in the UK, heads of terms is what you should expect to see.
Can heads of terms be used in the same way as a letter of intent in a US-style transaction?
Yes. If you are a UK-based tenant or investor working with US counterparties, or transacting on a property with American ownership, you may find the other party refers to the pre-contractual document as a letter of intent. The document they are describing serves the same purpose as heads of terms. The key is to ensure that whichever term is used, the document clearly states which provisions are binding, includes an exclusivity period if needed, and is marked subject to contract.
