Very simple – almost never do these 3D drawings represent what your project will actually look like or how it will function. Because why? For more details click Beaver Building & Remodeling.. Because these 3D drawings are designed to get you excited and entice you to make an immediate decision to sign a contract for work as marketing and sales tools. They have very few (if any) details, real or sufficient measurements taken from your home, and typically do not include specific requirements for the state and local building code specific to your project. Perhaps, worst of all, as comprehensive written Design Elements were never done, 3D drawings do not and cannot possibly represent what is important to you. Quite simply, the idea is to create a beautiful picture of instant gratification quickly, get you to sign a contract, and then use the Change Order process to later jack-up the price (usually after your house is demolished).Structural Engineering (SE) where appropriate. Certain projects require drawings and calculations to be provided by a structural engineer. To determine the type, size and strength required for wood, hardware (nuts, bolts, nails, straps, hangers, plates, etc.), anchoring systems, steel, concrete, shear, load, etc., this individual performs all the necessary drawings and calculations. Using current construction codes, the SE essentially ensures that the house has a good chance of surviving earthquakes, wind shear, and load to certain levels and degrees. The quantity and type of materials that the SE specifies for your safety has a measurable impact on the project cost. As you can see, until the architect completes the drawings, the SE cannot carry out its work. This is a significant reason why, until after the drawings and Structural Engineering are completed, estimates to perform any remodel are almost meaningless. Some projects may also require additional engineering, such as geological or soil engineering, but not limited to, and/or concrete engineering after tension. You should always be provided with an estimate for the engineering work before any engineering is authorised or carried out.