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Detailed Assessment of Costs (CPR Part 47): Process, Disputes and Strategy
Detailed assessment of costs is the court process used to determine which legal costs are recoverable and in what amount following litigation. Where the parties cannot agree the amount payable after a costs order, the court examines the bill of costs and determines the reasonable and proportionate level of recovery. Detailed assessment proceedings are governed primarily by CPR Part 47 and involve scrutiny of the bill of costs, Points of Dispute and Replies. The court considers issues such as reasonableness, proportionality, conduct and procedural compliance when determining the final amount payable. Understanding where disputes commonly arise is essential for both paying and receiving parties when managing exposure and protecting recoverability.
What Is a Detailed Assessment of Costs?
A detailed assessment occurs where the amount of costs payable has not been agreed following a costs order. The receiving party serves a bill of costs and the paying party may respond with Points of Dispute identifying the reductions sought. The receiving party may then serve Replies addressing those objections. If the dispute cannot be resolved through negotiation, the court determines the recoverable amount through provisional assessment or an oral detailed assessment hearing. Detailed assessment therefore operates as the formal mechanism through which disputes about legal costs are resolved. For further guidance on the process and strategy involved, see our guide to Paying Party Detailed Assessment Strategy.
What Happens During Detailed Assessment Proceedings
During detailed assessment proceedings the court reviews the bill of costs alongside the Points of Dispute and Replies. The exercise involves careful examination of both the work undertaken and the level of costs claimed.
The assessment may involve:
• examination of hourly rates
• review of delegation and efficiency
• analysis of whether work was reasonably undertaken
• consideration of proportionality
• evaluation of conduct throughout the litigation
Assessment outcomes are influenced not only by the entries within the bill but also by the overall litigation context and the arguments presented by the parties.
Hourly Rate Challenges
Disputes frequently arise regarding the hourly rates claimed by solicitors and fee earners. Courts commonly refer to the Guideline Hourly Rates 2026 as a starting point when assessing whether the rates claimed are reasonable.
Challenges typically arise where:
• rates exceed guideline levels
• the grade of fee earner is disputed
• delegation between fee earners is questioned
• the complexity of the work is challenged
Although courts may allow rates above guideline levels where justified, paying parties frequently argue that routine work should not attract premium rates.
Indemnity Costs Arguments
In certain circumstances the court may order costs to be assessed on the indemnity basis. Indemnity costs usually arise where conduct justifies departure from the standard basis of assessment.
Arguments concerning indemnity costs often focus on:
• whether conduct was unreasonable at the time
• procedural behaviour during litigation
• compliance with court directions
• litigation strategy and settlement conduct
Where indemnity costs apply, the approach to proportionality and doubt differs significantly from standard basis assessment.
Fixed Costs and CPR 45 Disputes
Even in cases where fixed recoverable costs under CPR Part 45 may apply, disputes still arise at detailed assessment.
Typical arguments concern:
• whether the claim falls within the fixed costs regime
• whether work falls outside the permitted stages
• whether exceptional circumstances apply
• duplication or unnecessary work
The interaction between fixed costs and litigation strategy is explored further in our guide to Intermediate Track Costs Tables and Fixed Recoverable Costs.
Fixed costs therefore do not eliminate disputes about costs; they simply change the nature of those disputes.
Retainer, Authority and CFA Transfer Issues
Changes in representation or retainer arrangements can raise questions about recoverability during detailed assessment.
These issues may include:
• duplication of work following transfer of solicitors
• questions regarding client authority
• inefficiencies during the transition between legal teams
Such matters frequently arise where Conditional Fee Agreements or representation changes occur during the life of the litigation.
Procedural Conduct and Recoverability
Procedural compliance plays a significant role in determining the recoverability of costs.
Issues commonly examined include:
• failures to comply with procedural deadlines
• late service of documents
• duplication caused by procedural errors
• inefficiencies arising from poor case management
Costs generated by procedural inefficiency may therefore be reduced or disallowed during detailed assessment.
Proportionality
Even where work has been reasonably undertaken, the court must consider whether the overall costs claimed are proportionate to the matters in issue.
When assessing proportionality the court may consider:
• the sums in dispute
• the complexity of the case
• the importance of the litigation
• the conduct of the parties
Where the overall level of costs is considered disproportionate, the court may apply global reductions even if individual items appear reasonable in isolation.
For a more detailed explanation of how proportionality arguments are advanced during assessment see Proportionality Challenges at Detailed Assessment
Provisional Assessment vs Oral Detailed Assessment
Many detailed assessments are initially determined through provisional assessment, a paper-based process conducted by a costs judge. The court reviews the bill of costs, Points of Dispute and Replies without an oral hearing.
Following provisional assessment the court issues a written determination indicating the amount allowed.
Where either party believes the provisional decision is incorrect, they may request an oral detailed assessment hearing, where the parties can address the judge directly and challenge the provisional findings.
Further guidance on this stage of the process can be found in our article on Oral Hearings Following Provisional Assessment.
Why Early Costs Strategy Matters in Detailed Assessment
The outcome of detailed assessment is rarely determined solely at the hearing stage. Decisions made during the litigation, including delegation, documentation, procedural compliance and case management, frequently shape the arguments that arise later.
Early strategic consideration of costs issues can influence:
• how work is recorded in the bill
• the framing of Points of Dispute
• negotiation strategy
• the prospects of settlement prior to assessment
A structured approach to costs strategy therefore helps reduce exposure and improve recoverability.
For practical guidance on challenging bills of costs see How Paying Parties Challenge a Bill of Costs at Detailed Assessment.
Summary: Detailed Assessment of Costs
Detailed assessment is the court process used to determine the recoverable amount of legal costs following litigation. Disputes commonly arise regarding hourly rates, proportionality, delegation, fixed costs scope and procedural conduct. Successful outcomes depend not only on the technical accuracy of the bill of costs but also on the strategic presentation of arguments concerning reasonableness and proportionality.
For both paying and receiving parties, careful preparation and early strategic input are central to achieving favourable outcomes in detailed assessment proceedings.
Detailed Assessment Strategy Guides: