In San Mateo, where space is precious and lifestyle expectations are high, every square foot counts. A thoughtfully designed Accessory Dwelling Unit (ADU) can do more than add space — it can completely reshape how you live, work, and connect.
Why homeowners choose ADUs in San Mateo:
Every lot in San Mateo has a story — narrow driveways, hillside grades, mature trees. We design ADUs that adapt beautifully to those constraints instead of fighting them.
Construction costs depend on site conditions, materials, and design complexity. Below are typical cost ranges:
| ADU Type | Average Cost Range | Description |
|---|---|---|
| Garage Conversion | $150,000 – $210,000 | Repurpose existing space into a livable unit. |
| Detached ADU | $270,000 – $550,000+ | Independent backyard home with full kitchen & bath. |
| Junior ADU (JADU) | $95,000 – $160,000 | Compact unit built within existing square footage. |
We provide transparent cost breakdowns during the consultation phase so you can plan effectively.
Use our San Mateo ADU Cost Calculator for a quick estimate.
We don’t just draw plans — we guide your entire project. Ataman Studio works closely with homeowners, contractors, and city reviewers to make ADU construction straightforward and predictable.
Our team understands the specific requirements of San Mateo’s neighborhoods — from Baywood to North Central — ensuring every unit complements its surroundings while adding measurable value.
Office: 13151 Fountain Park Dr, Los Angeles, CA 90094​
Phone: (213) 618-5456
Email: info@atamanstudio.com
Yes, but the city offers an expedited ADU review process, especially for standard-size units under 1,200 sq ft.
Yes, full kitchens and laundry areas are standard in most ADUs we design.
Yes — most detached ADUs can be up to 1,200 sq ft, depending on lot coverage and zoning.
Yes. You can choose separate or shared connections depending on your goals and property layout.
Typically 8–12 months from initial design to final construction, depending on complexity.
Yes, ADUs can be rented long-term. However, short-term rentals like Airbnb may be limited by city regulations.
Yes, we handle design, documentation, permits, and coordinate all construction phases.
