Below are three series of Costain/Coscan plans from the 1980s-1990s. I know that I am venturing way outside of the mid-century modern period, but as promised, I am posting all of the Ottawa Costain/Coscan plans that I have.  Costain changed names around 1989 to become Coscan. Costain still exists (with the same logo) as a British construction and civil engineering company. In Ottawa Coscan built until about 2002. Today the company is Brookfield Residential and does not currently build houses in Ottawa. Some of the plans from these collections have already been shared on my previous post on Convent Glen:  Costain in Convent Glen .  These three series of houses were built on lot widths approximately 40-feet wide or narrower and were constructed in both Kanata and Orleans. The Canadiana Series of houses are the older of the three series of designs  shown  below. A couple of the layouts do not have an ensuite  bathroom off of the master bedroom, bu...