In most cases, it is not possible to make an addition without a foundation. The weight of the addition will be too much for the existing structure to bear without additional support. Additionally, a foundation is necessary to provide insulation and protect the home from moisture damage. If you are considering an addition without a foundation, it is important to consult with a professional engineer to ensure that your home can safely support the added weight.

It Depends. Adding a room or structure to your house without a foundation is possible, but it's not recommended. Depending on your climate and the type of materials you use, the addition could shift or sink over time, leading to structural damage to your home. If you're determined to add on without a foundation, be sure to consult with a professional engineer to ensure that your addition is safe and structurally sound.