All Reasonable Endeavours In UK Commercial Contracts: Meaning & Drafting

If you’re running a small business, there’s a good chance you’ve seen (or been asked to accept) an “all reasonable endeavours” obligation in a commercial contract.

It often comes up when one party can’t guarantee an outcome, but the other party still wants comfort that proper effort will be made. Think: obtaining a consent, securing a licence, onboarding a new supplier, or hitting a launch date that depends on third parties.

The tricky part is this: “all reasonable endeavours” sounds clear, but in practice it can be a grey area. If you draft it loosely, it can create disputes about whether enough was done, how much money should have been spent, or whether your team should have prioritised it over other projects.

Below, we break down what “all reasonable endeavours” usually means in UK commercial contracts, when it’s helpful, what risks to watch for, and how to draft it in a way that protects your business from day one.

What Does “All Reasonable Endeavours” Mean In A UK Commercial Contract?

In plain English, an “all reasonable endeavours” obligation typically means:

• You must take active steps to try to achieve a stated outcome; and
• Those steps must be reasonable in the circumstances (not limitless or commercially ruinous); and
• You may need to do more than the bare minimum – but you’re not necessarily required to do “everything possible at any cost”.

It’s best understood as a “high effort” standard, often sitting between:

• reasonable endeavours (a lighter obligation), and
• best endeavours (often treated as more onerous, and potentially requiring significant sacrifice).

That said, UK courts don’t treat these phrases as magic words with fixed meanings in every situation. They interpret endeavours obligations in context, including:

• the contract as a whole (including risk allocation and payment terms);
• what the parties knew at the time of signing;
• how clear (or vague) the objective is;
• the timeframe; and
• what a reasonable business person would do in that market.

Why Small Businesses Should Care

For small businesses, the commercial reality matters. An “all reasonable endeavours” obligation can quietly create expectations about:

• time (how quickly you must act and how much staff time you must allocate);
• money (how much you must spend trying to achieve the outcome);
• priorities (whether you must prioritise this obligation over other customers or projects); and
• risk (what happens if the outcome isn’t achieved).

This is why the phrase often needs “scaffolding” around it: practical detail that explains what the obligation involves and where the boundaries are.

If you want a refresher on how obligations become enforceable in the first place, it helps to understand contract law basics and what makes a deal enforceable under a legally binding contract.

How Does “All Reasonable Endeavours” Compare To Reasonable Endeavours And Best Endeavours?

Most disputes around endeavours clauses happen because the parties had different expectations about the level of effort required.

Here’s a practical way to think about the three common standards.

Reasonable Endeavours (Lower Bar)

“Reasonable endeavours” is usually the most flexible (and least risky) standard for the party giving the undertaking.

It generally means you must take reasonable steps, but you may be able to choose between options and avoid steps that are disproportionately costly or disruptive.

In other words: you can act reasonably without having to exhaust every available route.

All Reasonable Endeavours (High But Not Unlimited)

“All reasonable endeavours” usually means you may need to take multiple reasonable steps and keep trying where it remains sensible to do so.

It’s not just “try once”. It’s closer to: “try all reasonable options that a sensible business would pursue.”

But that still leaves an important qualifier: reasonable. You’re normally not expected to:

• spend unlimited sums of money;
• accept a deal that would materially harm your business;
• breach the law or your other contracts;
• pursue steps that are clearly futile; or
• put your entire business on hold indefinitely.

Best Endeavours (Highest Bar, Often Risky)

“Best endeavours” is often treated as the most onerous standard and can require you to take steps even where it’s inconvenient or costly (so long as it’s not absolutely ruinous).

For many small businesses, “best endeavours” can be a red flag unless it’s heavily defined. If you’re being asked to agree to it, it’s worth negotiating for “all reasonable endeavours” or adding clear limits.

What About “Commercially Reasonable Endeavours”?

You might also see “commercially reasonable endeavours”, which is often used to emphasise that the obligated party does not need to act against its commercial interests.

It can be a helpful compromise in negotiations, but it still needs detail to avoid arguments later. The phrase is closely related to the general concept of commercially reasonable efforts.

When Should You Use “All Reasonable Endeavours” In Business Contracts?

As a small business, you should think of “all reasonable endeavours” as a tool for situations where:

• you can’t guarantee the outcome because a third party controls part of the process; but
• you’re willing to commit to a meaningful, active attempt.

Common examples include:

• Regulatory approvals (where timing depends on the regulator);
• Landlord consents in property-related contracts (where the landlord has discretion);
• Supplier onboarding or setting up logistics arrangements;
• Technology or platform integrations dependent on external systems;
• Finance conditions (e.g. you’ll use all reasonable endeavours to obtain funding by a date);
• Recruitment (e.g. using all reasonable endeavours to hire for a role by a target date).

When It’s Usually Not Appropriate

“All reasonable endeavours” can be the wrong tool if the outcome is fully within your control and should simply be a contractual promise.

For example:

• Delivering goods by a date you control (this is usually a delivery obligation, not endeavours);
• Paying an invoice (that’s a straightforward obligation, not “endeavours”);
• Maintaining insurance (again, typically a clear-cut obligation).

Using endeavours language in these situations can create ambiguity where you actually want certainty.

Watch How Endeavours Interacts With Liability

If your contract says you’ll use all reasonable endeavours to achieve a key outcome, you should also check:

• what happens if the outcome isn’t achieved (termination rights, refunds, credits);
• what losses could be claimed; and
• whether liability is capped appropriately.

This is where a properly drafted limitation of liability clause becomes essential, especially if the endeavours obligation is tied to revenue, delivery deadlines, or a client’s wider business plans.

How Do Courts Assess Whether You Met An “All Reasonable Endeavours” Obligation?

Even with a well-drafted contract, you should assume that if a dispute arises, the question will be: what did you actually do, and was it reasonable in context?

Courts commonly look at:

1) The Specific Outcome You Were Trying To Achieve

The clearer the objective, the easier it is to assess performance.

Compare:

• Unclear: “use all reasonable endeavours to promote the product”; versus
• Clearer: “use all reasonable endeavours to achieve onboarding of X supplier by , including completing the tasks in Schedule 1”.

2) The Steps Available And The Steps Taken

If there were several sensible options and you only tried one, that can create risk.

On the other hand, you usually don’t need to take steps that are obviously:

• disproportionate;
• unlikely to help; or
• commercially damaging beyond what the parties could reasonably have intended.

3) Time, Cost, And Resources

“Reasonable” is heavily context-dependent. What’s reasonable for a large organisation may be unreasonable for a small business with a small team and tight cashflow.

This is exactly why it’s smart to draft the contract so it reflects your real operating constraints (for example, a spend cap, or “no obligation to commence litigation”).

4) Whether You Prioritised The Obligation

An endeavours obligation often implies more than passive effort. If you delayed, ignored messages, or deprioritised the project without good reason, it can look like you didn’t genuinely try.

A practical tip: build reporting and documentation into your process so you can show what you did and when.

5) Whether You Acted Consistently With The Contract’s Risk Allocation

Courts often interpret endeavours in a way that fits the commercial bargain. For example:

• If you’re being paid a premium to deliver an outcome, you may be expected to do more.
• If the contract makes clear that the outcome is uncertain and the other party accepts that uncertainty, the steps expected may be narrower.

This is why the endeavours clause shouldn’t sit in isolation - it should align with the rest of your terms and conditions, pricing model, and remedies.

How To Draft An “All Reasonable Endeavours” Clause (Without Creating Unnecessary Risk)

If you want “all reasonable endeavours” to protect your business (instead of creating open-ended obligations), drafting detail is your best friend.

Here are the key drafting tools small businesses can use.

1) Define The Objective And Success Criteria

Be as specific as you can about what the endeavours are aimed at.

• What is the outcome?
• By when?
• How will the parties know it has been achieved?

Where relevant, you can include milestones (e.g. “submit application by ”, “complete onboarding tasks by ”).

2) List The Required Steps (Or At Least Categories Of Steps)

You don’t always need a long checklist, but you should consider including:

• the key actions you’ll take;
• what cooperation you need from the other party; and
• what decisions or approvals are outside your control.

This can be done in a schedule so it’s easier to update later if the project changes.

If you end up changing the process mid-project, make sure you document it properly - contracts can often be updated using contract amendments rather than informal email chains that later cause confusion.

3) Put Sensible Boundaries Around Cost And Escalation

This is one of the biggest risk areas for small businesses. If your contract is silent, the other party may argue you should have spent more.

Common boundaries include:

• Spend caps: “no obligation to spend more than £X in aggregate” (or “without the other party’s written approval”).
• No litigation obligation: “no obligation to commence proceedings” (or “no obligation to appeal”).
• No material adverse impact: “no obligation to take steps that would materially harm the business”.
• No breach of other duties: “no obligation to breach law or third-party contracts”.

These aren’t about avoiding responsibility - they’re about ensuring the obligation matches what you genuinely agreed to do.

4) Build In Cooperation Obligations For The Other Party

Endeavours clauses often fail because one party can’t progress without information, approvals, access, or decisions from the other party.

Consider adding obligations such as:

• providing information within a set timeframe;
• responding to requests promptly;
• signing documents or providing authorisations; and
• making staff available for meetings.

This helps prevent a situation where you’re blamed for delay that was actually caused by the other party’s inaction.

5) Add Reporting And Record-Keeping Requirements

A simple reporting mechanism can dramatically reduce disputes. For example:

• weekly progress updates by email;
• written status reports every fortnight; or
• a shared tracker of actions and outcomes.

If there’s a later dispute, being able to show a clear timeline of steps taken is often just as important as the wording of the clause.

6) Decide What Happens If The Outcome Isn’t Achieved

This is where many small businesses get caught. The contract should clearly address what happens if, despite all reasonable endeavours, the outcome doesn’t happen.

Options include:

• either party can terminate without fault after a long-stop date;
• the parties renegotiate in good faith;
• fees are refunded in whole or part (or are non-refundable because work was still performed);
• service credits apply; or
• the scope changes and the contract continues.

The right option depends on your pricing model, your margins, and how much risk you can realistically carry.

Example “All Reasonable Endeavours” Clause (Template-Style)

Every contract is different, and this example is for general information only (it isn’t legal advice):

Example:

The Supplier must use all reasonable endeavours to achieve the Milestone by the Target Date. In doing so, the Supplier must: (a) perform the actions set out in Schedule 1; (b) promptly notify the Customer of any material impediment; and (c) provide written progress updates weekly.

The Supplier is not required to: (i) incur third party costs exceeding £ in aggregate without the Customer’s prior written approval; (ii) commence litigation or appeals; or (iii) take any step that would cause the Supplier to breach any applicable law or any agreement with a third party.

If the Milestone is not achieved by the Long-Stop Date despite the Supplier’s compliance with this clause, either party may terminate this Agreement on written notice, and clause will apply.

That’s the kind of drafting that turns a vague phrase into something measurable and commercially workable.

If you need help tailoring the clause to your specific deal, it’s worth getting support with clause drafting so the endeavours obligation matches your actual project realities (budget, timing, dependencies, and risk).

Key Takeaways

• In UK contracts, “all reasonable endeavours” usually means taking active, persistent steps to achieve an outcome, but only to the extent those steps remain reasonable in the circumstances.
• It often sits between reasonable endeavours (lighter) and best endeavours (heavier), but in practice the meaning will depend on the contract context and the commercial bargain.
• Small businesses should be careful about hidden expectations around time, cost, and prioritisation - endeavours clauses can create significant operational and financial risk if left vague.
• The safest approach is to draft the objective clearly, list expected steps, and include boundaries (spend caps, no litigation, no breach of law/third-party obligations).
• Make sure the contract explains what happens if the outcome isn’t achieved (termination rights, fees, refunds, and liability), so you’re not relying on assumptions when things go off-track.
• Endeavours clauses work best when they align with your broader risk allocation, including clear remedies and a sensible limitation of liability position.

If you’d like help drafting or negotiating an all reasonable endeavours clause (or reviewing a contract before you sign), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.