World Estimating offers the best construction estimating services at affordable and inexpensive prices in each nook and corner of Massachusetts. This estimate includes all direct construction costs, general contractor's overhead and profit and design contingency.Step 1 – Take a sample item and calculate your total labor costs and material costs separately. This form satisfies all basic requirements of the state's Home Improvement Contractor Law (MGL Chapter 142A), but does not include standard. Fill out the form and enhance your budgeting with our topnotch construction cost estimating services Massachusetts.