The project is part of the wider £500m Perry Barr Regeneration scheme and will provide much-needed homes for local people in two four- to six-storey blocks that are due for occupation by 2023.
Offsite Solutions is manufacturing 692 steel-framed bathroom and ensuite shower pods for the two apartment buildings.
Dan Doyle, Operations Director at Willmott Dixon, said: "The benefits of using offsite manufacturing for a project of this scale are unmatched.
"In one day, we can install around 20 bathroom pods. Traditionally this would involve a number of trades and take several weeks.
"For our customers, bathroom pods mean additional project certainty and added programme benefits, along with assured quality. The benefits don't stop there. The use of the pods helps to reduce the project's carbon footprint while also supporting the compliance of Covid-19 safety guidance on site."