What are the applicable rules and principles where an offer to settle is considered?

The applicable rules and principles where offers to settle are concerned are not in dispute and were recently summarized by Justice Power in Bains v. Antle, 2017 BCSC 590 at para. 19 [Bains]. Rule 9-1(4), (5) and (6) provide: Offer may be considered in relation to costs (4) The court may consider an offer to settle when exercising the court's discretion in relation to costs. Cost options (5) In a proceeding in which an offer to settle has been made, the court may do one or more of the following: (a) deprive a party of any or all of the costs, including any or all of the disbursements, to which the party would otherwise be entitled in respect of all or some of the steps taken in the proceeding after the date of delivery or service of the offer to settle; (b) award double costs of all or some of the steps taken in the proceeding after the date of delivery or service of the offer to settle; (c) award to a party, in respect of all or some of the steps taken in the proceeding after the date of delivery or service of the offer to settle, costs to which the party would have been entitled had the offer not been made; (d) if the offer was made by a defendant and the judgment awarded to the plaintiff was no greater than the amount of the offer to settle, award to the defendant the defendant's costs in respect of all or some of the steps taken in the proceeding after the date of delivery or service of the offer to settle. Considerations of court (6) In making an order under subrule (5), the court may consider the following: (a) whether the offer to settle was one that ought reasonably to have been accepted, either on the date that the offer to settle was delivered or served or on any later date; (b) the relationship between the terms of settlement offered and the final judgment of the court; (c) the relative financial circumstances of the parties; (d) any other factor the court considers appropriate.