The demolition project can take a few hours to a few days. It can also be costly, depending on certain factors. One thing you should consider includes the total measurement of the structure. You can actually save more if it is a vast property, such as a commercial building.
Stripping out a building does not usually require a permit. However, you may have to get permission if the space you wish to demolish will affect the public and others who occupy that structure. Permits are also required for expansive spaces exceeding 40 square metres in floor area. Rules vary depending on your location. You should contact your local council before you proceed.