An Accessory Dwelling Unit (ADU) is a living space that is separate from the main part of the home, this space can be within the home itself, or situated on the same land. An independent living space such as this is illegal unless the correct permits have been purchased.
When planning an ADU home addition it is important to know the potential costs involved, and as always, these costs may vary depending on the size and the proposed budget of the project.
The usual processing costs of an ADU application are around $2,000 to cover the staff hours needed for its evaluation. The average fee for an ADU permit is under $10,000 on average, but this could almost double for more extravagant projects.
It is also worth noting that fees can differ between localities. This is thought to be down to the frequency of applications, with localities that process a lot of ADU permits charging less than ones that process them infrequently.