Unlike near net zero buildings, net zero buildings have renewable energy generation and can produce at least the same amount of energy the building uses on an annual basis. This often means that they require energy production and storage systems to be installed on site. The most common energy generation solution for single family homes is a solar panel (i.e., photovoltaic (PV)) system located on the roof.

A photovoltaic system would require additional components and design such as:

• Conduit and wiring to the rooftop PV array
• Anchor points on the roof to support the PV array mounting racks
• PV array (solar panels)
• A method of servicing the PV array (safe rooftop access/anchors if required)
• DC disconnect, solar inverter, charge controller, battery pack
• Possibly a backup generator

A cost-effective way of building a near net zero building that could easily be turned into a net zero building (i.e., net zero ready) would be to install additional components during the initial construction process and to make allowances for the future installation of other more costly components.

Components such as PV array mounting rack anchor points and conduit for the rooftop PV array wiring should be installed during initial construction to avoid costly electrical and roof re-work. Mechanical rooms should also be sized with enough room for the future installation of required electrical components that come with PV.