Abstract: A method for finishing a window opening in a log structure during erection of the log structure comprises: at least partially forming a wall of the log structure by placing at least one support log into a wall position; disposing a pre-assembled window opening frame upon the support log; nestably engaging a side receiving channel of one a pair of side frame pieces of the pre-assembled window opening frame with an end of at least one wall component log stacked vertically atop the support log and adjacent the side frame piece; and stacking a frame header log vertically atop an upper frame piece of the pre-assembled window opening frame.

Abstract: A kit for use in erecting a log structure having a finished window opening formed therein includes a support log, having a substantially horizontal support tenon formed in a top thereof; and a header log, having a substantially horizontal header tenon formed in a bottom thereof. At least one pre-assembled window opening frame includes: an upper frame piece configured to nestably engage the header tenon; a lower frame piece configured to nestably engage the support tenon; and a pair of side frame pieces coupled intermediate the upper and lower frame pieces. Each side frame piece has a side receiving channel formed in an outward side thereof, the side receiving channels being configured to nestably engage at least a portion of one of a plurality of wall component logs stacked adjacent to the side frame pieces and vertically atop the support log.