The mechanical design included an all-electric HVAC system comprised of electric unit heaters, a mini split AC system, and bathroom exhaust fans tied to occupancy sensors, for continuous fresh air intake. Hot and cold-water plumbing for the few sinks, showers, and toilets was routed from the building’s mechanical room (located in the corner nearest the addition). Drainage from these fixtures was solved using a compact forced sewer toilet system with a sump and macerating (grinding) pump. The power cables, domestic water piping, and sanitary drainage piping were bundled into a heat-traced conduit (to protect against freezing). This collection of pipes was routed, above ground, through the building’s envelope and into the mechanical room to tie into the existing services. A platform was eventually added to cover this bundle.