# The Civil Procedure Rules 1998, Rule 45.13: Unreasonable behaviour


(1) Where, in a claim to which Section VI, Section VII or Section VIII of this Part applies, an order for costs is made in favour of a party whom the court considers has behaved unreasonably, the other party may apply for an order that those costs be reduced by an amount equivalent to 50% of the fixed recoverable costs which would otherwise be payable.
(2) Where, in a claim to which Section VI, Section VII or Section VIII of this Part applies, an order for costs is made against a party whom the court considers has behaved unreasonably, the other party may apply for an order that those costs be increased by an amount equivalent to 50% of the fixed recoverable costs which would otherwise be payable.
(3) In this rule—
(a) unreasonable behaviour is conduct for which there is no reasonable explanation; and
(b) “fixed recoverable costs which would otherwise be payable” does not include—
(i) VAT;
(ii) any additional amounts under rules 36.17 or 36.24; or
(iii) any disbursements.

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Source: https://www.legislation.gov.uk/uksi/1998/3132/rule/45.13 (the official version)
Page: https://openlegislation.uk/civil-procedure-rules-1998/rule-45.13
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.