. >> reporter: sherwing and w say efficiencies are gained in the construction phase too. block vets and hires its own builders. >> their guys are showing up and everything is ready for them to install. because block acquire the customer, you're eliminang this dance that renovators have to do. >> reporter: instead of the dance, the dreaded building accept lowerees by making rs to their jobs easier. >> they don't like to do marketing on instagra they don't like to do all the little billing and adminithrative work. don't like to be sending out 20 proposals and hoping to win >> reporter: they do like to build, though. werwin andg believe dangling a carrot, a pipeline of future projects, eliminates a builder's greatest fear, finding the next. >> you don't have to go to the customer, you don have to call them and say, what about this, what about that, sizes, specs, . finish it's streamlined. so i could potentially set up a crew ando multiple jobs at once. >> reporter:hisoup to nuts bathroomat renovn in new york city took less than a month, one-third of the national average, and