Landscaping plans for the Carlisle, Mass., farmstead are reviewed with landscape architect Stephanie Hubbard, while plumbing-heating expert Richard Trethewey installs a septic tank and carpenter Norm Abram discusses windows with architect Jeremiah Eck. Meanwhile, host Kevin O'Connor checks out the windows in a house in Park City, Utah. On “Ask This Old House,” contractor Tom Silva installs adjustable shelves in a homeowner's den and Trethewey installs a hot water recirculator pump in the upstairs bathroom of another.