One small addition to this house in Montclair, NJ cured several of its problems simultaneously. The once awkward kitchen had been too wide for efficient use but too narrow for an island. Now, though it’s considerably more spacious, everything is within reach. Converting its backsplash into a strip of windows opened up views to the yard. And where the family room had been unfurnishable due to one too many doors, moving the back door into the new laundry/mud room suddenly left space for a sofa.