Impossible to be sure without seeing exactly what is involved; 'verrière' can be little more than a skylight, but as they specifically mention 'façades', I don't think it can be that; they might even mean those 'greenhouse' style protruding structures often seen punctuating the façades of industrial buildings, but it's impossible to be sure.
As to the term to use for 'façades' here, I'm afraid it's really guesswork as to precisely what they mean; one might use 'Mary's suggestion of 'façades', but that might suggest that the entire wall is glazed, whereas they talke about 'insertion', rather suggesting it is only occasional.