, ▁steel , ▁or ▁concrete . ▁Mod ular ▁components ▁are ▁typically ▁constructed ▁ind o ors ▁on ▁assembly ▁lines . ▁Mod ules ' ▁construction ▁may ▁take ▁as ▁little ▁as ▁ten ▁days ▁but ▁more ▁often ▁one ▁to ▁three ▁months . ▁PM C ▁modules ▁can ▁be ▁integrated ▁into ▁site ▁built ▁projects ▁or ▁stand ▁alone ▁and ▁can ▁be ▁delivered ▁with ▁M EP , ▁fi xt ures ▁and ▁interior ▁finish es . ▁ ▁The ▁buildings ▁are ▁ 6 0 % ▁to ▁ 9 0 % ▁completed ▁off site ▁in ▁a ▁factory - control led ▁environment , ▁and ▁transport ed ▁and ▁assemble d ▁at ▁the ▁final ▁building ▁site . ▁This ▁can ▁compr ise ▁the ▁entire ▁building ▁or ▁be ▁components ▁or ▁sub ass emb lies ▁of ▁larger ▁structures . ▁In ▁many ▁cases , ▁mod ular ▁contract ors ▁work ▁with ▁traditional ▁general ▁contract ors ▁to ▁explo it ▁the ▁resources ▁and ▁advantages ▁of ▁each ▁type ▁of ▁construction . ▁Comple ted ▁modules ▁are ▁transport ed ▁to ▁the ▁building ▁site ▁and ▁assemble d ▁by ▁a ▁c rane . ▁P lacement ▁of ▁the ▁modules ▁may ▁take ▁from ▁several ▁hours ▁to ▁several ▁days . ▁ ▁P erman ent ▁mod ular ▁buildings ▁are ▁built ▁to ▁meet ▁or ▁exceed ▁the ▁same ▁building ▁codes ▁and ▁standards ▁as ▁site - built ▁structures ▁and ▁the ▁same ▁architect - spec ified ▁materials ▁used ▁in ▁convention ally ▁constructed ▁buildings ▁are ▁used ▁in ▁mod ular ▁construction ▁projects . ▁PM C ▁can ▁have ▁as ▁many ▁stories ▁as ▁building ▁codes ▁allow . ▁Un like ▁re loc atable ▁buildings , ▁PM C ▁structures ▁are ▁intended ▁to ▁remain