Key Takeaways
- A Calderbank offer is a type of without prejudice settlement offer used in UK litigation, which can directly influence how the court decides who pays legal costs.
- Making a Calderbank offer early in a dispute can shield you from unnecessary legal expenses if your opponent refuses a reasonable proposal.
- Calderbank offers offer unique flexibility, including use for non-monetary settlement terms, but do not provide the same automatic cost consequences as strict Part 36 offers.
- Mark a Calderbank letter “without prejudice save as to costs” to ensure it is admissible when the court assesses legal costs at the end of proceedings.
- Ignoring or rejecting a fair Calderbank offer could expose you to significantly higher legal costs if you fail to beat the offer at trial.
- Calderbank offers can be withdrawn or changed at any time before acceptance, maintaining your control over negotiations.
- Time limits for acceptance are flexible but must always be specified clearly in the offer letter.
- Our client feedback is Excellent on Trustpilot with more than 130 five-star reviews and a 4.9/5 rating from clients.
For tailored Calderbank offer advice or a free initial review, contact our litigation team at 0207 459 4037 or book a Free Consultation online.
What Is a Calderbank Offer and How Does It Affect Costs in UK Litigation?
Getting your settlement strategy wrong in English litigation can lead to costly consequences, even if you win the main dispute. Calderbank offers and Part 36 offers play different roles in how courts allocate legal costs. Knowing how Calderbank offers can protect you is essential for managing your risk.
A Calderbank offer is a flexible, written settlement proposal made “without prejudice save as to costs.” It allows you to put forward terms without undermining your case if the offer is refused. The court will later consider these offers when deciding who pays what in legal fees, often penalising a party who failed to accept a fair proposal.
A Calderbank letter is particularly valuable where the dispute involves complex settlements, ongoing commercial relationships, or terms—such as apologies or asset transfers—that a rigid Part 36 offer cannot reflect.
When Should You Use a Calderbank Offer?
Calderbank offers are most effective in disputes where flexibility, confidentiality, or creative settlement terms matter. This includes commercial litigation, construction claims, professional negligence, and director or shareholder disputes.
Sending a Calderbank offer with clear, reasonable terms demonstrates to the court that you acted responsibly to try to resolve the matter. If the other side rejects your fair proposal and achieves no better at trial, they could be ordered to pay your legal costs from the date of your offer.
How Does a Calderbank Offer Impact Legal Cost Recovery?
When a Calderbank offer is on the table and the opponent declines it, the court has discretion to penalise unreasonable conduct on costs, applying the rules in Civil Procedure Rule 44.2. If you subsequently obtain a result at trial that is equal to or better than your Calderbank offer, the judge may order the other side to pay all or a significant proportion of your legal costs from the date they could have settled but refused.
Unlike Part 36, these cost consequences are not automatic but are influenced by the fairness and clarity of your offer, and the other party’s conduct.
Delays or unclear settlement proposals can dramatically reduce your chances of recovering costs. Early strategic advice is the safest way to maximise your protection.
Calderbank Offer vs Part 36 Offer: Which Is Best for Your Case?
Civil Procedure Rule 36 governs Part 36 offers and sets strict requirements—including exactly how the offer is made, deadlines, and automatic cost penalties if the offer is not beaten. In contrast, Calderbank offers are more flexible. They can address non-money terms, be served at any time, and do not need to comply with Part 36 formalities.
Choosing the right form of offer depends on your dispute’s complexity, your objectives, and the remedies you require. Our lawyers will help you weigh certainty versus flexibility to select the format that gives you the best tactical advantage.
Step-by-Step Guide: How to Draft a Calderbank Offer Letter
A properly set out Calderbank offer letter is crucial for legal protection. Follow these steps to maximise the strategic value:
- Assess the realistic settlement value and your goals for resolving the dispute.
- Draft a clear letter stating precisely what you propose and when it must be accepted.
- Addressee the letter correctly and reference all relevant parties.
- Include the phrase: “Without prejudice save as to costs”.
- List any proposed monetary amounts, asset transfers, apologies, or terms with precision—do not leave any details open to interpretation.
- Specify a clear acceptance deadline, typically at least 21 days.
- State that the offer may be produced to the court during costs assessments if not accepted.
- Send the offer via a traceable method (typically email or recorded post) and retain proof of service.
Our team recommends using a structured template for each offer to reduce the risk of mistakes and enhance your negotiating strength.
Serving and Timing of Calderbank Offers
You can serve a Calderbank offer at any stage of a dispute—pre-action, during proceedings, or even when appeals are pending. Timely offers, made after sufficient disclosure of key facts and evidence, tend to have the greatest impact on cost decisions.
Always deliver the offer to the opponent’s solicitors and keep robust records of when and how the letter was sent.
Withdrawing, Varying, or Accepting Calderbank Offers: Practical Considerations
A Calderbank offer is open to acceptance, withdrawal, or variation at any time before acceptance. Clearly state all changes or withdrawals in writing and retain copies.
If you withdraw a Calderbank offer, be explicit and prompt. Failure to clearly communicate withdrawals or changes can result in confusion or dispute over settlement status, with potential legal cost implications.
Our solicitors can advise urgently on how to withdraw, extend, or revise your Calderbank or Part 36 offers with maximum cost protection.
Legal Rules, Deadlines, and Case Law: How the Courts Assess Calderbank Offers
The legal basis for Calderbank offers rests in court rules and established case law. The primary principles are:
- Civil Procedure Rule 44.2 gives the court broad discretion over who pays legal costs, allowing it to consider any relevant settlement offer.
- Practice Direction 47 outlines how costs are determined and the weight given to parties’ conduct, including their use of Calderbank offers.
A Calderbank offer should always include a reasonable period for acceptance, usually 21 days unless circumstances clearly require less. Omitting a deadline can result in an offer being argued as still open for acceptance even after trial, which could weaken its value for cost protection.
If you need support understanding the best acceptance period or wording, our lawyers will advise to maximise your advantage.
Key Cases: What Have the Courts Said About Calderbank Offers?
| Case | Facts | Outcome | Importance |
|---|---|---|---|
| Calderbank v Calderbank [1975] | Divorce settlement proposal | Calderbank letters recognised for costs | Foundation of the modern Calderbank offer |
| Coward v Phaestos Ltd [2014] | Property dispute | Costs shifted after reasonable offer refused | Shows powerful costs impact of Calderbank offers |
| F&C Alternative Investments v Barthelemy [2012] | Partnership dissolution | Costs judgment weighed Calderbank letters | Emphasises judicial discretion |
| Gibbon v Manchester City Council [2010] | Personal injury settlement | Compared Part 36 and Calderbank strategies | Highlights need for careful offer selection |
The judicial approach in these cases confirms the courts’ willingness to penalise unreasonable rejection of Calderbank offers, even if that party technically “wins” their claim.
Strategic Uses: When to Choose a Calderbank Offer
Strategically, a Calderbank offer shines where you require flexibility or confidentiality, or when an early, meaningful attempt to settle could pressure your opponent to avoid unnecessary costs. The offer is especially valuable in:
- Complex commercial litgation (multi-claim, high stakes)
- Disputes involving non-cash terms (assets, shares, apologies, services)
- Construction claims with unique project obligations
Our litigation team designs bespoke settlement strategies, including when and how to use Calderbank offers, to match the intricacies of your commercial or property dispute.
Typical Scenarios: Calderbank Offers Across Litigation Types
Construction and Property Disputes
Calderbank offers enable parties to incorporate creative, project-specific resolutions—whether involving staged repair works, asset transfers, or delayed payment schedules.
Contract and Commercial Claims
Flexible terms—including instalments or business arrangements—are often best reflected in a Calderbank format, particularly in fast-moving industries or high-value disagreements.
Shareholder, Partnership, and Director Disputes
When relationships break down, Calderbank offers can provide a framework for share buybacks, changes to voting rights, or resignation terms—options not easily formalised in a Part 36 proposal.
Our expert litigation solicitors routinely advise clients on the tactical use of Calderbank letters in all major commercial and professional sectors.
Our Approach: How Our Experts Handle Calderbank Offers
Our litigation lawyers take a proactive, strategic approach:
- Fast, fixed-cost review of your dispute to assess the best settlement route—often within 24–48 hours
- Secure client portal and WhatsApp messaging for seamless Calderbank and Part 36 letter management
- Clear, court-ready advice on the comparative strengths of each offer format, adapted to your risk profile
- Precision drafting and records management for every letter, deadline, and negotiation checkpoint
- Transparent fixed-fee arrangements and—where appropriate—no-win, no-fee litigation
With extensive experience handling negotiations across the commercial, construction, director and shareholder sectors, we drive outcomes that protect your interests and mitigate unnecessary costs.
If you need urgent support on making, responding to, or withdrawing a settlement offer, arrange a free initial consultation with our litigation specialists.
Frequently Asked Questions About Calderbank Offers
Is a Calderbank offer legally binding?
A Calderbank offer only becomes contractually binding once formally accepted in writing. Before acceptance, neither party is under any legal obligation.
What happens if I reject a Calderbank offer and do not beat it at trial?
The court may order you to pay the other side’s legal costs from the date you could have settled, even if you win on minor points at trial.
Can Calderbank offers be used for non-monetary or creative terms?
Absolutely. Calderbank letters are often used to propose apologies, business restructuring, or asset transfers—flexibility that Part 36 offers cannot easily match.
Will my Calderbank letter be seen by the judge before trial?
No. The judge only considers the offer when determining costs after the main dispute is resolved. This protects the confidentiality of negotiation conduct during the substantive hearing.
Is it appropriate to use a Calderbank offer during mediation or arbitration?
Yes, Calderbank offers are commonly deployed in mediation, arbitration, and all stages of pre-action or in-proceedings negotiation.
How is a Calderbank offer enforced in court?
If accepted, the agreement is enforceable as a binding contract and, if necessary, as a consent order. If rejected, it is only used to support your costs arguments after the final judgment.
What deadline should I give for accepting a Calderbank offer?
At least 21 days is generally considered reasonable. For complex disputes, more time may be appropriate. Shorter deadlines should always be justified.
Are Calderbank offers common in construction or landlord-tenant cases?
Yes, they are frequently used in construction, property, and franchise disputes due to their adaptability and creative potential.
Should I reply in writing to a Calderbank offer?
Yes. Immediate, written responses demonstrate reasonableness and can strengthen your costs position if the case proceeds further.
What are the risks of ignoring or dismissing a Calderbank or Part 36 offer?
Failure to properly consider or respond to a bona fide offer often results in severe negative costs consequences, even for a party who partially succeeds at trial.
Get Calderbank Offer Guidance From Proven Litigation Experts
Strategically using a Calderbank offer can be the difference between achieving an early, advantageous settlement and facing unnecessary financial and legal risks in court. We’ve explained how Calderbank offers differ from Part 36, the vital importance of clear drafting, and practical steps to secure your position in litigation.
Our solicitors are highly rated for resolving complex cases efficiently, using settlement strategies tailored to your sector, objectives, and the dispute’s unique facts. For swift, clear advice on your options, contact us today.
