they sayblock's i average cost slightly below remodeling magazines' mid-range average, about $28,000 in the new york area for an existing 5 by 7 room.io the nl average, about $20,000. >> we find a lot of people are sort of paralyzed by how many thousand combinations are out there. >> reporter: by limiting its range of products, block knows what it needs and it can negotiate prices for tubs and faucets, vanities and the like. >> we create a 3d model. >> reporter: it also streamlines the design process. would probably t five, six gn versus doing it using the products in the catalog, takes about an hour. >> itasically is an efficiency on every single step of the renovation process. >> 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