How to prepare an estimate of electrical material for a construction

Electricity is a vital component of any construction project. During the design phase of a new project, an electrical engineer oversees the layout of the installation and who will design all the details of wiring and plugs.

Contractors will use this plan to estimate material quantities and costs, before making the offer. The preparation of this estimate is a simple task and can be carried out by anyone with a basic knowledge of electrical components and the work plane.


  1. It locates the scale factor of the electrical installation plan and its corresponding in the scale of architect. Usually, the first is located near the lower right corner of the plane.
  2. Measure the length of each length of wiring (usually the cable is drawn with a dashed, curved line between plugs and integral parts) with the architect scale. Add all distances to find the final total cable you’ll need.
  3. Prepare a list of all electrical elements, sockets and keys that appear in the plane, differentiating the wrenches of 3 wires, the multiple mouths and others. Use the plane symbol key to define each type.
  4. Contact a vendor center for electricians or builders to get a quote for the cost of wiring and other installation components.
  5. Multiply the cost of each unit (with the calculator) of the list by its price, to obtain the total cost of each group. The cables are budgeted per linear foot.
  6. Add up the cost of all items on the list to have the final amount of electrical materials.

Tips & Warnings:

  • The estimation of the labor costs of an electrical installation can vary greatly depending on the type of project, depending also on the experience of the workers and the complexity of the project. Generally, contractors charge an hourly rate until they have all the data for the installation (number of hours per installer to complete the job) and a project estimate based on its size.

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