Plans and specifications for your project provide the basis for obtaining contractor bids and preparing a contract with the company your select. The level of detail required varies depending on the size and complexity of the job. However, without detailed plans and specifications, it is difficult for contractors to accurately bid on a job and virtually impossible for you to compare bids you receive.

Plans consist of drawings, diagrams or sketches that describe the work to be done, including all measurements and construction details. For new home construction or a renovation project that involves any alteration or addition to the structure of your home, this means full and complete construction drawings. These drawings will also be required to obtain a building permit. For simple projects that don't require a building permit, less formal drawings may be adequate, but these must still provide a thorough and clear description of the work you want done.

Specifications are a detailed list of the products and materials to be used in the project and can include such things brand names, model numbers and colours. For small jobs, such as shingle replacement, the necessary specifications would include brand and style, colour and wear warranty of the new roofing material. For large jobs like a new home or major renovation, a much lengthier list of specifications will be needed, including details on all structural and finishing materials to be used.

So how do you get the plans and specifications you need? Many contractors will provide design services for a fee. If you pay a contractor to prepare drawings and specifications, you should not feel obligated to hire them to do the work. Use the plans and specifications you purchased as the basis for obtaining contractor bids.