Revising Costs Budgets: Significant Developments Under PD 3E

Costs budgets are not static documents. Litigation evolves, and where a case develops beyond what was reasonably anticipated, the Civil Procedure Rules allow for revision. Understanding when and how a budget can be revised is critical to protecting recoverability at detailed assessment.

What Counts as a “Significant Development”?

PD 3E paragraph 7.6 requires parties to revise budgets where significant developments in the litigation warrant change.

A significant development is not simply spending more time than expected. Courts look for:

• a change in the scale or complexity of the litigation

• events not reasonably anticipated at the time of budgeting

• procedural developments altering the case trajectory

The question is factual and case-specific.

PD 3E Paragraph 7.6 Explained

The rule requires:

• budgets to be revised upwards or downwards where warranted

• proposals to be shared with the opponent

• reasons and objections to be documented

• court approval if agreement cannot be reached

This embeds budgeting into ongoing case management rather than treating it as a one-off exercise.

Judicial Guidance on Significant Developments

Case law emphasises that:

• mistakes in the original budget do not justify revision

• developments must represent a change from the anticipated status quo

• courts should not set the bar unrealistically high

Judges recognise that if revision were too difficult, parties would produce defensive and inflated budgets from the outset.

When Courts Are More Likely to Allow Revisions

Revisions are more likely where:

• disclosure is substantially larger than anticipated

• expert evidence expands beyond original expectations

• procedural orders alter the scope of the litigation

• the case becomes more complex than reasonably foreseeable

These situations frequently overlap with issues of proportionality and overall case management.

Common Mistakes That Undermine Revision Applications

Applications often fail where:

• the development could reasonably have been foreseen

• the original assumptions were too vague

• evidence does not clearly show the change in workload

• the application is delayed

Courts expect prompt action once a development becomes clear.

Strategic Importance for Costs Recovery

Budget revisions are not simply administrative. They affect:

• exposure modelling

• settlement positioning

• recoverability at assessment

• the ability to resist reductions based on budget overspend

Failure to revise can limit recovery regardless of the work actually undertaken.

Link to Assessment and Recoverability

Where a budget is not revised, the consequences often appear at detailed assessment where courts scrutinise whether costs exceeding the approved budget are recoverable.

Budget management therefore forms part of overall costs recovery strategy.

Key Takeaways

• A significant development involves an unforeseen change in litigation scope or complexity

• PD 3E embeds budgets within ongoing case management

• Courts balance realism with the need to avoid inflated initial budgets

• Evidence and timing are critical

• Budget revisions directly affect recoverability