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DESIGN & PRICE CENTER

How does adu construction work?

Building an ADU involves several separate phases, each handled by specialized trades. The process typically starts with design and permitting, followed by site prep and foundation work. Once that’s complete, the structure and exterior shell are assembled, then mechanical, electrical, and plumbing systems are installed. Finally, interior finishes, fixtures, and landscaping bring it all together.


Typical Cost Breakdown

Every project is unique, but here’s a general guide for a mid-range ADU:

Design & Permits: 5–10%  $1K–$5K

Site Prep & Foundation: 10–20%  $10K–$30K

Pre-Panelized ADU Kit (Structure, Shell & Materials):  $88K–$160K

Mechanical, Electrical & Plumbing: 10–20%  $10K–$20K

Interior Finishes & Fixtures: 10–20%  $5K–$10K

General Contractor & Project Management: 5–10% $10K–$20K

For more information on financing, construction & our homes

Explore Our FAQs Idaho ADU Regulations

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FAQs

  • What is prefab and why choose it?

    Prefab (prefabricated) homes are built off-site in a factory and then delivered and assembled on your property. Choosing prefab can save time, reduce construction waste, and provide consistent quality compared with traditional on-site building. It’s an efficient, flexible, and often more cost-effective way to add an ADU or tiny home to your property.

  • Do I need a permit to install a prefab home?

    Yes, most pre-fab homes or ADUs require city or county permits for correct and legal installation. Permit and document costs vary by region.

  • What’s the difference between modular, prefab manufactured, and stick-built homes?

    Modular homes are built in sections in a factory and assembled on-site. They meet local building codes.

    Prefab manufactured homes are fully built in a factory and transported to the site; they often follow HUD codes.

    Stick-built homes are constructed entirely on-site from raw materials.

    Understanding the differences helps you choose the right home type for your budget, timeline, and property.