- 1). Study the building plan and determine the quantity of each construction material the plan calls for. Make a list of all these supplies and call the contractors department of your building supply company to get the price for all these materials. Materials can include lumber, concrete, drywall, plumbing, electrical components, nails, screws, drywall mud, paint, insulation, roofing materials, guttering, and the cost of transporting all the supplies. You should also calculate the anticipated electricity use for the project. Add 10 percent to the total of these amounts as a precaution to get the total cost of materials.
- 2). Call your local municipality and find out what permits and inspections are needed and the cost involved in each instance. Find out all applicable rules and regulations so the project can be completed legally. Rates and regulations vary from area to area. Determine the costs involved with all necessary permits and inspections for your specific building extension and add all of these figures together.
- 3). Add the cost of your building supplies to the cost of the permits and other fees. This is the figure you will need to estimate the cost of your DIY building extension. A free building cost calculator may also be useful to see if you have estimated correctly.
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