Last reviewed: 22 June 2026

Summary

Commercial contracts fail not because the law is unclear but because the drafting is. Drafting a dispute-proof commercial contract requires defining each party’s obligations, the consequences for breach, and the route to resolution before disagreement starts. In England and Wales, the courts interpret what the parties wrote, not what they meant to write, and most disputes arise from ambiguity, missing clauses, or contradictory terms. Drafting to avoid disputes means anticipating the points of friction, such as payment, delivery, termination, and liability. And resolving them on paper when the relationship is still cooperative.

• Define every material obligation in measurable terms so that compliance can be verified without interpretation.
• Include express termination rights with clear notice periods and consequences to prevent arguments over whether a contract has ended.
• Draft dispute-resolution clauses that specify tiered escalation, governing law, and jurisdiction before any conflict arises.
• Exclude or cap liability categories explicitly and early, because the Unfair Contract Terms Act 1977 will not do it for you.
• Avoid incorporating standard terms by reference unless you attach the current version and define which document prevails in a conflict.

Introduction

Here is a common situation I so often see when a new client instructs me. A freelance graphic designer agrees to deliver “high-quality brand assets” by the “end of March” for £5,000. The client rejects the final files as “not on-brand” and refuses to pay. The designer points to email approval of drafts. The client says approval was conditional on final refinement. Neither side has a written definition of deliverables, acceptance criteria, or revision limits. A £5,000 project becomes a £15,000 dispute.

The above scenario may differ in industry type and the sums involved, but the fundamental problem is always the same, namely expectations were not communicated or recorded in writing and each party relied on assumptions.

One of the main reasons I created 43 Legal was because I saw clearly how many expensive contract disputes could have been avoided if the parties had drafted their commercial contracts correctly and taken a risk management approach to the entire contractual process. This guide was developed to help you, dear reader, avoid some of the most common drafting mistakes that keep dispute resolution solicitors busy.

What makes a commercial contract enforceable in England and Wales?

Before drafting a dispute-proof commercial contract, you must ensure the agreement is legally enforceable. A binding contract requires offer, acceptance, consideration, and intention to create legal relations (the latter is generally assumed in commercial contracts). Formality is not usually required. Contracts can be oral, written, or formed by conduct. But enforceability depends on certainty of terms. As Lord Hoffmann held in Investors Compensation Scheme Ltd v West Bromwich Building Society [1998] 1 WLR 896: “interpretation is the ascertainment of the meaning which the document would convey to a reasonable person”. The reasonable person reads the whole contract in its commercial context but cannot rewrite unclear terms or guess what the parties intended.

The Law of Property (Miscellaneous Provisions) Act 1989 requires contracts for the sale or disposition of land to be in writing and signed by all parties. Guarantees must comply with section 4 of the Statute of Frauds 1677 (in practice, also written and signed). For all other commercial contracts, writing is not mandatory. Still, it is the only reliable way to prove the terms if the relationship breaks down.

Certainty means the court can identify what each party must do, when, and what happens if they do not. A contract to supply “products as required,” with no price mechanism, quantity, or timeframe, is unenforceable due to the uncertainty it creates. A contract that states “the supplier will invoice monthly at prevailing rates and deliver within a reasonable time” is enforceable because the court can imply a reasonable price under the Sale of Goods Act 1979 section 8 and a reasonable delivery period under section 29. However, contract disputes over what constitutes “reasonable” still arise. This is why precise drafting is vital.

How should obligations and deliverables be defined?

Every material obligation must be defined in terms that allow objective verification. Deliverables should specify format, quantity, quality standard, acceptance criteria, and the procedure for rejection. Vague language, “satisfactory quality”, “industry standard”, “best efforts”. Invites argument because each party applies a different benchmark.

A software-development contract that requires the developer to deliver “a working e-commerce platform” without defining the required features, performance benchmarks, or acceptance tests creates three points of failure. The client may argue that the platform is not “working” because load times exceed two seconds; the developer may say it works but the client’s hosting is inadequate; and neither can prove a breach without an agreed specification. Better drafting attaches a functional specification as a schedule, lists acceptance criteria (for example, processes 100 concurrent transactions without error, integrates with Stripe API, passes penetration testing by a named standard), and sets a testing window with defined reject-and-remedy cycles.

Payment obligations must state the amount or the formula, the trigger (on signing, on delivery, or monthly in arrears), and the payment period. “Payment within 30 days of invoice” is clear; “payment on satisfactory completion” is not, unless the contract defines what satisfies completion and who decides. The Late Payment of Commercial Debts (Interest) Act 1998 gives suppliers a statutory right to interest and recovery costs for late payment, but only after the payment date has passed. If the contract does not specify the date, enforcement is delayed while the parties argue over when payment became due.

Time limits should state whether time is of the essence. If so, late performance constitutes a repudiatory breach, allowing the innocent party to terminate. If it is not, late performance is a minor breach, giving rise only to damages. Under English common law, time is not of the essence for most commercial obligations unless the contract or the nature of the transaction makes it so. State the position explicitly in every clause that involves a deadline.

What termination rights should be included?

Drafting a dispute-proof commercial contract is never more important than when it comes to termination clauses. Well-drafted clauses prevent disputes over whether a contract has ended and who owes what. Every commercial contract should include termination for convenience (allowing either party to exit on notice without cause), termination for breach, and termination for insolvency. Without these clauses, a party can terminate only if the other commits a repudiatory breach, and arguing over whether a breach is serious enough to justify termination is expensive.

• Termination for convenience should specify the notice period, whether notice must be in writing, and what happens to work in progress and payments already made. A consultancy contract that allows either party to terminate on 30 days’ written notice avoids the argument over whether unsatisfactory performance justifies immediate exit. The client simply gives notice. The consultant is paid for work completed during the notice period and has time to find a replacement engagement.
• In the case of termination for breach of contract should list the breaches that trigger an immediate right to terminate (material breaches) and those that require notice and an opportunity to remedy (minor breaches). Material breaches typically include non-payment beyond a specified period, breach of confidentiality, insolvency, and failure to maintain required insurance. Minor breaches should trigger a notice period (commonly 14 or 30 days) within which the defaulting party can cure the breach. If the breach is not cured, the innocent party may terminate.
• Termination for insolvency is triggered when a party enters administration, liquidation, or any formal insolvency process, or when a winding-up petition is presented. This is an automatic termination right in most commercial contracts and prevents an insolvent party from continuing to draw down services or goods it cannot pay for. The Insolvency Act 1986 section 233 prohibits termination of certain essential supply contracts (utilities, IT, telecoms) solely because of insolvency, but that exception is narrow and does not apply to most commercial supply agreements.

Every termination clause should state the consequences of termination: whether accrued rights survive, what happens to confidential information, whether the customer must pay for work in progress, and which clauses survive termination (commonly confidentiality, liability, governing law, and dispute resolution).

How do you exclude or limit liability effectively?

The starting position under English law is that a party in breach must compensate the innocent party for losses that arise naturally in the ordinary course of things from the breach, or that were in the reasonable contemplation of both parties as a probable result of the breach at the time the contract was made, as established in Hadley v Baxendale (1854) 9 Exch 341 and confirmed by the House of Lords in Koufos v C Czarnikow Ltd (The Heron II) [1969] 1 AC 350. Consequential losses, loss of profit, loss of contracts, reputational damage, are recoverable only if they fell within that mutual contemplation as a probable consequence, not merely because a loss of that type was foreseeable in a general sense.

The Unfair Contract Terms Act 1977 prohibits any exclusion of liability for death or personal injury caused by negligence (section 2(1)) and subjects exclusions of liability for other loss or damage caused by negligence to a reasonableness test (section 2(2)). Exclusions of liability for breach of contract in business-to-business contracts are valid provided they satisfy the reasonableness test in section 11, which considers the parties’ bargaining power, whether the customer received an inducement to agree to the term, and whether the customer could have contracted elsewhere without the exclusion.

A well-drafted liability clause separates four categories: liabilities that cannot be excluded (death, personal injury, fraud), liabilities that are excluded entirely (loss of profit, loss of revenue, loss of contracts, loss of data, reputational damage), liabilities that are capped (direct losses capped at the total fees paid or payable in the 12 months before the breach), and uncapped liabilities (breach of confidentiality, infringement of third-party intellectual property). Define “consequential loss” if you exclude it, because the term has no settled meaning in English law, and courts will construe ambiguity against the party seeking to rely on the exclusion.

Insurance requirements should align with liability caps. If the supplier’s liability is capped at £1 million, the contract should require the supplier to maintain professional indemnity insurance of at least that amount. Require the supplier to produce an annual certificate of currency and to notify the customer immediately if cover lapses.

What dispute-resolution clause reduces litigation risk?

A dispute-resolution clause agreed before any conflict arises will control how disagreements are handled and often prevents escalation to court. The clause should specify governing law, jurisdiction, and the escalation procedure. For cross-border contracts, specify whether disputes will be resolved by litigation or arbitration, because arbitration awards are enforceable in over 160 countries under the New York Convention 1958. In contrast, court judgments require separate enforcement proceedings in each jurisdiction.

Governing law is the substantive law that interprets the contract. For a contract performed in England and Wales, the governing law will usually be the law of England and Wales. Jurisdiction is the country or court system that will hear disputes. The two can differ: a contract governed by English law may give exclusive jurisdiction to the courts of Paris if both parties are French companies and the convenience of a French forum outweighs the cost of applying English law.

Tiered dispute resolution reduces cost and preserves relationships. A typical tiered clause requires the parties first to negotiate in good faith for 14 days, then to attempt mediation under the Centre for Effective Dispute Resolution (CEDR) Model Mediation Procedure, and only if mediation fails to proceed to litigation or arbitration. Mediation is not binding unless the parties reach a settlement, but the Commercial Court actively encourages it and may penalise a party in costs if that party unreasonably refuses to mediate, as confirmed in Churchill v Merthyr Tydfil County Borough Council [2023] EWCA Civ 1416, in which the Court of Appeal held that courts have the power to stay proceedings and order parties to engage in ADR, and reinforced by the Civil Procedure (Amendment No. 2) Rules 2024, which took effect on 1st October 2024. A party that unreasonably refuses to mediate may also face a costs sanction at the court’s discretion.”.

Arbitration clauses should specify the arbitration rules (commonly the London Court of International Arbitration (LCIA) Rules or the International Chamber of Commerce (ICC) Rules), the seat of arbitration, the number of arbitrators, and the language of proceedings. The seat determines which national law governs the arbitration procedure and which courts have supervisory jurisdiction. The Arbitration Act 1996 governs arbitrations seated in England and Wales and restricts court intervention to very limited grounds, making an arbitration award nearly always final.

How do you incorporate standard terms without ambiguity?

Incorporation by reference, for example, “This contract is subject to our standard terms and conditions, available at [URL]”, creates a significant risk if the URL changes, if the version is not specified, or if the recipient fails to see the terms. The safer approach is to attach the current version as a schedule to the contract, include a version number and date in the schedule header, and include express language in the main body confirming which document governs, for example: “the Standard Terms at Schedule 2 (version 3.1, dated 15th March 2025) apply to this agreement and prevail over any conflicting terms in purchase orders or acknowledgements.” This approach fixes the terms at the point of signing, removes any dispute about which version applied, and makes clear that the supplier’s terms take precedence in a battle-of-the-forms scenario.

A so-called ‘battle-of-the-forms’ scenario is where the buyer’s purchase order incorporates the buyer’s standard terms and the seller’s acknowledgement incorporates the seller’s standard terms. Is resolved in England and Wales by identifying the last document exchanged before performance began. That document’s terms usually prevail, under the “last shot” rule established in Butler Machine Tool Co Ltd v Ex-Cell-O Corporation (England) Ltd [1979] 1 WLR 401. To avoid this, include an express term stating “these terms apply to the exclusion of any other terms that the customer seeks to impose or incorporate, and any such attempted incorporation is rejected”.

Where two sets of terms conflict, the court will attempt to reconcile them by reading the contract as a whole. If reconciliation is impossible, the more specific term prevails over the general, and handwritten or typed terms prevail over pre-printed standard wording. A signature line that states “I accept the terms above and the Standard Terms attached” creates a stronger incorporation than a URL footer.

Changes to incorporated terms after contract formation do not bind the other party unless that party agrees in writing. If your standard terms include a clause permitting unilateral variation, that clause is likely unenforceable in a business-to-consumer contract under the Consumer Rights Act 2015. It may be challenged under the Unfair Contract Terms Act 1977 in a business-to-business context. Variation clauses should require mutual written consent and be signed by authorised representatives.

What are the most common drafting mistakes?

In my experience, the errors I see most regularly are:

• Ambiguous defined terms create confusion throughout the contract. If “Services” is defined in the recitals as “consulting services” but the operative clauses refer to “provision of the Services and any associated deliverables”, it is unclear whether deliverables fall within the defined term or are additional. Define terms once, in a definitions section or schedule, capitalise every use, and ensure operative clauses use only the capitalised defined term.
• Inconsistent clause numbering, cross-references, and schedules signal poor drafting discipline and reduce trust. If clause 8.3 cross-refers to “clause 6.2 (Confidentiality)” but clause 6.2 is headed “Payment Terms”, the reader questions whether other cross-references are equally unreliable. Every cross-reference should be verified before execution.
• Boilerplate clauses copied from other contracts without adaptation often contradict the substantive deal. A jurisdiction clause granting exclusive jurisdiction to the courts of New York in a contract between two English companies with English law is probably an error. A force-majeure clause that excuses non-performance due to “acts of God, war, strikes, or failure of third-party suppliers” may excuse late delivery of a software licence even though software delivery is not affected by physical events, unless the clause is tailored to the subject matter.
• Missing signature blocks or unclear signing authority allow a party to argue later that it is not bound. Every contract should identify the signatories by name and role, include a signature line and date line for each party, and state the capacity in which the signatory signs (director, authorised signatory, partner). A signatory who signs “for and on behalf of [Company Name]” binds the company; a signatory who signs in their own name may incur personal liability.
• Entire-agreement clauses are intended to exclude pre-contract representations and confirm that the written contract is the whole agreement. A standard entire-agreement clause will not exclude liability for fraudulent misrepresentation, following AXA Sun Life Services plc v Campbell Martin Ltd [2011] EWCA Civ 133. It may not exclude liability for negligent misrepresentation unless it uses clear wording that satisfies the Unfair Contract Terms Act 1977 reasonableness test. If pre-contract statements are important, record them as warranties in the contract rather than relying on an entire-agreement clause to exclude them.

Frequently asked questions

Can I use a template contract from the internet?

Yes, but templates are generic and rarely fit the transaction. A template drafted for a US software licence will include Delaware governing law, reference the Uniform Commercial Code, and omit data-protection obligations required under UK GDPR. Templates are a starting point, not a finished contract. Every clause must be reviewed against the deal, the jurisdiction, and the parties’ risk appetite.

Do I need a solicitor to draft a commercial contract?

No legal requirement exists, but the cost of poor drafting usually exceeds the cost of professional advice. A £2,000 drafting fee prevents a £20,000 dispute. Solicitors identify risk, ensure enforceability, and draft clauses that survive challenge in court. For low-value, low-risk contracts, a well-maintained in-house precedent may suffice. For complex or high-value transactions, instruct a solicitor.

What happens if the contract is silent on termination?

A contract with no express termination clause can be terminated only for repudiatory breach (a breach so serious it goes to the root of the contract) or by mutual agreement. Proving repudiatory breach requires evidence that the breach deprived the innocent party of substantially the whole benefit of the contract, which is a high threshold. A termination-for-convenience clause allows exit without proving breach and avoids a dispute over whether the breach was serious enough.

Can I change a contract after both parties have signed?

Yes, by written agreement signed by both parties. Oral variations are generally enforceable under English common law, but section 2 of the Law of Property (Miscellaneous Provisions) Act 1989 requires variations of land contracts to be in writing and signed. Many commercial contracts include a “no oral modification” clause requiring all variations to be in writing and signed, and such clauses are enforceable following Rock Advertising Ltd v MWB Business Exchange Centres Ltd [2018] UKSC 24.

How long should a commercial contract be?

Long enough to cover the obligations, risks, and consequences, and no longer. A contract for a one-off supply of standard goods may be three pages. A contract for a five-year outsourcing arrangement with service levels, data protection, business continuity, and step-in rights may run to 50 pages, plus schedules. Length is not quality. Clarity is.

Talk to 43Legal

We draft, review, and negotiate contracts to prevent disputes and protect your position if disagreements arise. If you are entering a new commercial relationship or revisiting existing terms, contact us to discuss how we can help.

The content of this article is for general information only.  It is not, and should not be taken as, legal advice.  If you require any further information in relation to this article, please contact 43Legal. 

Melissa Danks is the founder of 43Legal. She has over 20 years’ experience as a solicitor working within the legal sector dealing with issues relating to risk management, dispute resolution, and advising in-house counsel in SMEs and large companies. Melissa has extensive expertise in providing practical, valuable, modern legal advice on large commercial projects, joint ventures, data protection and GDPR compliance, franchises, and commercial contracts. She has worked with stakeholders in multiple market sectors, including IT, legal, manufacturing, retail, hospitality, logistics and construction. When not providing legal advice and growing her law firm, Melissa spends her time running, walking in the countryside, reading and enjoying downtime with close friends and family.