A 900 sq ft ADU offers the comfort of a small home, often designed with two bedrooms and two bathrooms. This makes it especially attractive for families, multi-generational living, or as a high-value rental property. With more room than mid-size ADUs, a 900-square-foot unit balances functionality with construction cost efficiency.
Here’s how the budget for a 900 SF ADU typically breaks down:
| Category | Estimated Cost Range |
|---|---|
| Construction (hard) | $180,000 – $250,000 |
| Site prep & utilities | $20,000 – $40,000 |
| Design & engineering | $12,000 – $22,000 |
| Permits & city fees | $8,000 – $16,000 |
| Total | $210,000 – $330,000+ |
Most projects of about 900 square feet fall into the $220k–$270k range, depending on site prep, finishes, and local city fees.
💡 Tip: A 900-square-foot ADU can comfortably support a 2 bed / 2 bath floor plan, significantly boosting both livability and rental ROI.
Timelines for a 900 sq ft ADU are slightly longer than mid-size units, but still faster than full-scale builds:
💡 Ataman Studio manages the full process — from custom floor plans and permits to construction oversight — keeping projects on schedule and within budget.
