I don't know exactly how old the houses you are interested in are, but Adam Stirling, b. ABT 1818 builder of Galashiels did some work in the area, according to this
https://en.m.wikipedia.org/wiki/The_Kirna"Ordnance Survey Name Books for the parish of Innerleithen written prior to the construction of The Kirna cite a "one storey house" named Kirnie, property of the Horsburgh family, situated at or near the current site of The Kirna.
It is believed that the house started life as the shepherd's cottage for Pirn House (demolished in early 1950s) and was built by Stirling & Son of Galashiels when they were building the mill houses in Walkerburn for "Captain" Horsburgh."
Adam Stirling, builder and his wife Mary had several sons, eldest James was a builder and went into the family business while the second son David became a joiner. Although son William is recorded as an architect in the census of 1871, in 1881 he seems to have been working for the family business with James. They employed 29 men.