Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Upland ADU cost →Building an ADU in Upland costs between $160,000-$300,000 for new construction, with per-square-foot costs averaging $200-$350. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $70,000-$150,000, while prefab/modular ADUs fall in between at $80,000-$180,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | Building permit and plan-check fees via the Development Services Department — confirm amounts with Building & Safety, (909) 931-4110 |
| Impact Fees | Waived under 750 sq ft; proportional to primary-dwelling floor area at 750 sq ft and above; water/sewer connection and capacity charges apply to new-construction ADUs (conversions exempt unless built with a new home) |
| Site Prep & Foundation | $10,000 – $35,000 |
| Framing & Structure | $15,000 – $45,000 |
| Plumbing | $8,000 – $20,000 |
| Electrical | $5,000 – $15,000 |
| HVAC | $3,000 – $8,000 |
| Interior Finishes | $15,000 – $40,000 |
Quotes for the same ADU commonly vary 20–40% between builders. Get up to 3 free quotes from ADU builders serving Upland — no obligation.
Get Upland builder quotes →Permit fees in Upland are Building permit and plan-check fees via the Development Services Department — confirm amounts with Building & Safety, (909) 931-4110. The review timeline is 60 days from complete application (SB 543 deemed-approval applies from 2026), with plan check: Reviewed by Planning (zoning) and Building & Safety (CBC/CRC); design standards require matching materials/roof slope, 12-inch eave overhangs, privacy screening, down-lighting, and drought-tolerant landscaping; roof decks prohibited. Impact fees are Waived under 750 sq ft; proportional to primary-dwelling floor area at 750 sq ft and above; water/sewer connection and capacity charges apply to new-construction ADUs (conversions exempt unless built with a new home). Pre-approved plans: Yes — free, permit-ready pre-approved ADU plans for Upland residents; third-party architects may also submit Pre-Approved ADU Templates; site plan still required.
| 1-Bedroom Rent | $1,950-$2,150/month |
| 2-Bedroom Rent | $2,400-$2,600/month |
| Annual Rental Income (est.) | $24,600/year |
| Payback Period (est.) | 9.3 years |
| Short-Term Rental | No — ADUs and JADUs may not be rented for terms under 30 days regardless of when they were built; the city separately regulates short-term rentals via administrative use permit (Ch. 17.23.1) |
| Overall ROI Estimate | 7-10% annual return (gross rental yield estimate) |
A typical ADU in Upland generates approximately $24,600 per year in rental income based on average 1-bedroom rents. At an average construction cost of $230,000, the estimated payback period is 9.3 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Upland and varies by market (often less than build cost).
1. Garage conversions save 40-60% vs new construction since the shell already exists. Average cost in Upland: $70,000-$150,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $80,000-$180,000.
3. Pre-approved plans — available in Upland, which can save $3,000-$10,000 in design costs and 2-3 months in review time.
4. State grants — California's CalHFA ADU grant (up to $40K) is currently paused; check calhfa.ca.gov/adu for status and your state for active programs.
5. Get multiple bids — ADU contractor pricing varies 20-40% for the same project. We recommend getting at least 3 quotes.
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