I'm sure there is.
I'm also sure if it were cheaper than traditional build it would be advertised and theyd be everywhere.
BTW I'm all for prefabbed done right. Should be better finish than built on site in our weather. Just in construction the general rule is that anything prebuilt or forecast or prefabbed is dearer and you save by being efficient.
So an estate built in factory and dropped off trucks is dearer than building on site but by saving programme and site costs you make money
ecohouse.ie were advertising a full spec (hrv, underfloor heat, pv solar, triple glazed) 3 bed 110sqm passive standard modular sip build for 150k ex vat plus site works, a year or two ago. Modular so I'd imagine this could be scaled up and down to suit the modules. Build time was 8-12 weeks and a few weeks on site iirc. Do you reckon that would work out cheaper then a comparable traditional build in the end or the same?