When working in cities, downtown areas, and developed suburbs or remodeling existing buildings, contractors can face many constraints: lack of material storage space, limited vehicle access, and other trades getting in the way. There is no exact formula for estimating the costs of working on tight sites: No two situations are alike. But successful companies learn how to allow for lower productivity and run the jobs as efficiently as possible Since masonry requires many different materials--the units, cement, sand, lime, insulation, flashing, etc.--staging areas are important. But storage problems aren't limited to city sites. Remodeling occupied buildings also is tricky. Contractors employ a variety of methods to cope with limited staging areas. These include; just-in-time delivery, working alternate shifts, or utilizing other staging areas. Some other essentials to working in tight sites are job coordination, and the use of space saving equipment.