ADU Design & Build · Fremont
ADU Builder in Fremont
Fremont's bigger lots make backyard homes genuinely feasible — feasibility, design, 60-day permits, financing, and fixed-price construction, minutes across the Dumbarton.
Fremont gives homeowners what much of Silicon Valley proper can't: lot size. Ranch homes in Mission San Jose, Niles, and Ardenwood sit on parcels with genuine room for detached ADUs, while school-driven demand (Mission San Jose above all) and the Tesla/Warm Springs job base keep rents and resale resilient.
We've crossed the Dumbarton for Fremont projects from day one — it's 20–25 minutes from our Sunnyvale office. Fremont permitting is its own system (it's an Alameda County city, not Santa Clara), with well-documented objective standards and an online Citizen Access portal we run routinely.
We handle the whole arc: a feasibility check on your actual parcel, a design tuned to Fremont's setbacks and objective standards, a complete 60-day submittal, fixed-price construction, and rent guidance from our in-house brokerage.
ADU permits in Fremont
Fremont Building & Safety (39550 Liberty St.) takes online submittals via the city's Citizen Access portal and holds the state-mandated 60-day clock for compliant ADUs. Because Fremont is in Alameda County, the process runs entirely through the city — but the statewide ADU rules still apply: ministerial 60-day approval, at least 800 sq ft guaranteed on most lots, and an impact-fee exemption under 750 sq ft.
What’s included
Lot Feasibility Check First
Setbacks, utilities, trees, and buildable envelope on your Fremont parcel — before you spend a dollar.
Detached New-Construction ADUs
400–1,200 sq ft backyard homes — Fremont's bigger lots leave room for larger, family-sized units.
Garage Conversion ADUs
The fastest path: existing structure becomes a studio/1BR for $125K–$220K.
Financing & Pro Forma
Cost, rent, and payback modeled upfront; HELOC and renovation-loan structuring in-house.
Fixed-Price Contracts
Locked construction pricing with milestone payments — no cost-plus roulette.
What it costs in Fremont
| Project | Typical Range | Notes |
|---|---|---|
| Garage conversion (≈400 sq ft) | $125K – $220K | Studio or 1BR |
| Detached studio/1BR (400–600 sq ft) | $220K – $330K | $350–$550/sq ft |
| Detached 2BR (750–1,000 sq ft) | $320K – $480K | Room for larger units on bigger lots |
| Attached ADU | $300 – $450 / sq ft | Shares structure; saves foundation cost |
Units under 750 sq ft are exempt from impact fees statewide. Fremont 1–2BR ADUs rent for $2,300–$3,500, driven by Tesla, Warm Springs, and BART.
What we build in Fremont
- Detached ADUs on Niles & Glenmoor lots
- Family-sized 2BR units in Mission San Jose & Ardenwood
- Garage-conversion ADUs in Centerville & Irvington
- Workforce rental ADUs near Tesla / Warm Springs
- Multigenerational backyard units for extended families
ADU Design & Build — full details
Process, scope, and everything our adu design & build service covers Bay Area-wide.
All services in Fremont
Remodels, ADUs, permits, real estate, and financing across Fremont.
Fremont ADU Design & Build FAQs
Is Fremont good for ADUs?+
One of the best East Bay cities for it: bigger lots, clear objective standards, 60-day review, and rents of $2,300–$3,500 for 1–2BR units driven by Tesla, the Warm Springs innovation district, and BART commuters.
What does an ADU cost in Fremont in 2026?+
All-in: garage conversions $125K–$220K; detached 400–600 sq ft units $220K–$330K; detached 2-bedrooms $320K–$480K. Detached new construction runs $350–$550/sq ft — and Fremont's larger yards often leave room for bigger, higher-renting units.
Does Fremont being in Alameda County change anything?+
Only the permitting office — it all runs through the City of Fremont rather than Santa Clara County. The statewide ADU laws (60-day ministerial approval, 800 sq ft minimum, impact-fee exemption under 750 sq ft) apply exactly the same.
Do you really cover Fremont from Sunnyvale?+
Yes — 20–25 minutes via the Dumbarton. Fremont is a primary service city for us: same crews, same project management, same process.
How long does a Fremont ADU take?+
Typically 9–14 months: 6–10 weeks design and engineering, the 60-day permit window, and 5–8 months of construction (4–6 months for a garage conversion).
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