The cost of ADU (Accessory Dwelling Unit) plans varies based on complexity, size, and design needs, typically ranging from $5,000 to $15,000 for architectural plans. The design and planning stage can cost between $6,000 and $14,000, while custom engineering and design plans range from $8,000 to $13,000. Pre-made plans offer a more affordable option at around $5,000. Consulting services and permit fees add further costs, with consulting fees ranging from $8,000 to $12,000 and building permits from $2,000 to $10,000.
Opting for an in-house provider with an architect can significantly reduce costs and streamline the process. An in-house team can offer bundled services, ensuring seamless integration of design and construction, which can lower the overall cost and simplify project management. This approach can be more cost-effective, reducing the need for multiple external consultants and ensuring all aspects of the project comply with local regulations efficiently. In summary, ADU plan costs can total between $5,000 and $30,000 or more, but working with an in-house provider can help manage and potentially lower these expenses.