Alex Fawcett had been looking for a midcentury fixer-upper for two years before he found this one tucked among the trees in Northford, Connecticut. When he purchased it from the sellers, he learned that it had been designed and built in 1956 by their father, local architect Cyril K. Smith, who had studied at Yale under Louis Kahn. Alex became the second owner after promising Smiths’ children that any changes would uphold the home’s innate design sense. What followed was a hands-on remodel, with the interior designer doing much of the work with help from family and friends. In the kitchen, rich black soapstone counters wrap black-matte Ikea cabinets, and appliances are hidden behind cabinet fronts so the room recedes. Storage now extends under the windows and lines the dining area, where the table and chairs were both Craigslist finds.