In California, "A" contractors are engineers and "B" contractors are general contractors.
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There are the highest biders among Contractors
If no specialized grading contractors are available in your area, most landscape contractors offer grading services as well as many contractors who do excavation work. Drainage contractors will also often offer grading services.
According to Docstoc.com, paving contractors typically charge between $60 and $100 per hour. They may charge other fees such as site visit fees or preparation fees.
difference between the manufacture of bricks and manufacture of tiles
general building contractors, heavy construction contractors, and special trade contractors, which includes those engaged in concrete work.