The affordable housing group is working with KWC Architects to finalize the design for the $6-million developmenton Carson's Road, east of Montreal Road and the Aviation Parkway.
Parameters will be posted on Merx, a procurement site commonly used by all levels of government, early in 2012.
OCH recently received a $4-million grant from the city and willl contribute the balance itself.
"It's certainly an important grant for us, and we're excited about being able to build new, which is a rarity nowadays," said Jo-Anne Poirier, OCH's chief executive, in an interview with OBJ.
Stacked townhouses were chosen to make the most of the lot. Each one will be equipped with energy-efficient technologies in some way; the details are still being finalized.
OCH has accelerated its push into green building with a $3.7 million renewable energy infrastructure grant it received in August. The group will use the money to add solar panels to 33 locations, or one-fifth of its portfolio.
The group is Ottawa's largest community housing provider and the second-largest in the province after an agency in Toronto.