Set on a leafy rise in Portland, Maine’s Munjoy Hill neighborhood, a young family’s 1850s home redesign started with a trove of treasures. When the homeowners came to designers Kacee Witherbee and Juliana Barton of Insides Studio , they brought with them furniture, textiles, and objects collected across generations: a needlepoint rug that had followed them from apartment to apartment, an antique cabinet once hung in a grandmother’s living room, and a rooster weathervane, among other objects. While the designers initially signed on to refresh the kitchen, as they expanded their reach throughout the house, the scope grew to include a new full bathroom, millwork and former parlor-turned-library. A personal relic punctuated nearly every moment.

A Jordan McDonald Narrow Folded Sconce is mounted along the wall, while a custom oil cloth rug by Black Point Mercantile grounds the dining table. The walls are painted in Farrow & Ball String No. 8 .…