Complete 2026 cost breakdown: construction, permits, financing, and expected rental ROI.
Calculate your Evanston ADU cost →Building an ADU in Evanston costs between $140,000-$280,000 for new construction, with per-square-foot costs averaging $155-$310. These figures include design, permitting, site preparation, and construction. The most affordable option is a garage conversion at $75,000-$170,000, while prefab/modular ADUs fall in between at $105,000-$235,000.
| Cost Category | Estimated Range |
|---|---|
| Architectural Plans | $3,000 – $15,000 |
| Permits & Fees | the previous '$2,500-$4,000' had no traceable source. Fees follow the City's building permit fee schedule; request a quote from Building & Inspection Services. |
| Impact Fees | $800-$1,400 |
| 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. We pass your request to up to 5 local builders serving Evanston, where we have them — free, no obligation.
Get Evanston builder quotes →Permit fees in Evanston are the previous '$2,500-$4,000' had no traceable source. Fees follow the City's building permit fee schedule; request a quote from Building & Inspection Services.. The review timeline is Not published; the previous '50-70 days' had no traceable source. Ask Building & Inspection Services for current review times., with plan check: Not published (not verified; the previous '2-3 weeks' had no source). Impact fees are $800-$1,400. Pre-approved plans: Not available - no City pre-approved plan program was traced 9/20; the previous 'available for select types' claim had no source.
| 1-Bedroom Rent | $1,500-$2,000/month |
| 2-Bedroom Rent | $1,900-$2,700/month |
| Annual Rental Income (est.) | $21,000/year |
| Payback Period (est.) | 10.0 years |
| Short-Term Rental | Evanston licenses vacation rentals separately; confirm whether an ADU may be licensed |
| Overall ROI Estimate | 6-8% annual return |
A typical ADU in Evanston generates approximately $21,000 per year in rental income based on average 1-bedroom rents. At an average construction cost of $210,000, the estimated payback period is 10.0 years — before accounting for the resale value the ADU adds, which an appraiser determines from comparable sales in Evanston 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 Evanston: $75,000-$170,000.
2. Prefab/modular ADUs offer predictable pricing and faster timelines. Average: $105,000-$235,000.
3. Pre-approved plans — Evanston does not offer a pre-approved/standard ADU plan program yet, so budget for custom architectural plans (typically $3,000-$15,000). See which cities offer pre-approved ADU plans.
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.
Tell us about your project and we'll pass it to ADU builders serving Evanston. Free, no obligation — you choose who to work with. We don't have builders in every area yet; if nobody covers yours, we'll email you to say so.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Just browsing? Search ADU builders near you by ZIP code.