ADU Design Resource · Grants Pass, OR
The Complete Guide to
Building an ADU in Grants Pass, OR
Everything Grants Pass homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Drawings from $997 (more below)
Quick Answers About Grants Pass, OR ADUs
Market Context
Grants Pass has a median home value of $330,000. Adding an ADU typically increases that by 25.0% — approximately $82,500 in added equity. A 1-bedroom ADU in Grants Pass rents for approximately $1,150/month in the Josephine County rental market , yielding a 7.7% cap rate on the investment. Occupancy averages 92.0% in this market.
Top Grants Pass neighborhoods for ADU investment include Fruitdale, Historic Northwest (Downtown), Meadow Wood, New Hope, Grants Pass East. Close to downtown, schools and parks with many single-family homes and medium-to-large lots—good for ADUs. High rental/job demand and walkable proximity to downtown businesses, making ADU rentals attractive.
Permit Process
Permit applications are reviewed by the Building Division , with a plan check timeline of approximately 2.0 weeks. Permit fees in Grants Pass range from $4,810 to $6,809 depending on project scope. Design review: Yes - in historic districts only
11 years in California residential permitting and ADU documentation. This guide was researched and verified against Grants Pass's building department records and current 2026 California ADU law.
Property Eligibility
Is My Grants Pass, OR Property Eligible for an ADU?
Grants Pass homeowners benefit from California's state ADU law — one of the most permissive frameworks in the country since 2020. Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Grants Pass under California state law. No owner-occupancy requirement in Grants Pass — you can rent both units as investment properties. Ministerial permit approval — no neighbor input or discretionary design review.
Multi-Family Property
Up to 2 detached ADUs plus JADUs (Junior ADUs) within the existing main structure are permitted under California state law. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 14% of Grants Pass homes are in an HOA. California law (AB 670) prohibits HOAs from banning ADUs outright, but they can impose reasonable architectural standards. Our drawings include HOA submission formatting.
Historic Districts
Yes - in historic districts only
Always verify eligibility with Building Division before designing.
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Grants Pass ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Grants Pass construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. Assumes ~85% occupancy, ~30% expense ratio, 25.0% property value uplift. Consult a financial advisor before investing.
Data sources: Grants Pass Development Services Department, Zillow Rental Market Reports, local appraiser records. Last verified: 2026-05-30.
Local Market Data
Top Grants Pass Neighborhoods for ADU Investment
Fruitdale
Close to downtown, schools and parks with many single-family homes and medium-to-large lots—good for ADUs.
Historic Northwest (Downtown)
High rental/job demand and walkable proximity to downtown businesses, making ADU rentals attractive.
Meadow Wood
Established single-family neighborhood with wider streets and larger lots suitable for detached ADUs.
New Hope
Higher-value single-family lots with space for ADUs and strong owner/renter demand.
Grants Pass East
Residential area with substantial single-family housing stock and moderate lot sizes—good ADU potential.
Redwood
Higher-value neighborhood with larger parcels and demand for rental options near river parks and amenities.
Lincoln Park
Family-oriented neighborhood near services and parks with many single-family lots suitable for ADUs.
Grants Pass Northwest
Mix of single-family homes and newer subdivisions—opportunity for detached ADUs on larger lots.
Grants Pass North
Close enough to jobs and services to support rentals and contains many older single-family parcels for ADU conversion.
Riverside
Riverside-adjacent areas attract renters and offer parcels with ADU-ready lot sizes in places.
Grants Pass ADU Market at a Glance
Local Zoning Rules
Grants Pass ADU Zoning Regulations
| Regulation | Grants Pass Allowance |
|---|---|
| Max ADU Size | 1,000 sq ft |
| Max Height | 35 ft |
| Side Setback | 3.0 ft |
| Rear Setback | 3.0 ft |
| Owner Occupancy | Not required |
| Short-Term Rental | Permitted |
| Coastal Overlay | No |
| Design Review | Yes - in historic districts only |
| HOA Prevalence | 14% of properties |
Data verified recently. Always confirm with the Building Division before designing.
Grants Pass Permit Process
Grants Pass ADU Permit Timeline & Fees
Local Financing Resources
Local ADU Lenders in Grants Pass
These lenders offer HELOC, construction, and renovation loans for ADU projects in Josephine County. Compare terms before committing.
Offers HELOCs and construction mortgage options (construction loans listed up to $2,000,000); flexible terms for home improvements.
Visit Lender ↗Provides One-Time Close, Construction-Only and Renovation loans and HELOC products suitable for ADU projects.
Visit Lender ↗Local Grants Pass branches; HELOC product documentation shows draw period and standard HELOC terms (draw period ~120 months).
Visit Lender ↗Local credit union in Grants Pass; offers home loans and member lending products (can be paired with renovation financing).
Visit Lender ↗Specialty renovation financing that leverages after-renovation value; RenoFi works via credit union partners (First Community CCU is listed among RenoFi partners).
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Grants Pass
We draw the plans. These contractors build them. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Next Steps
Ready to Move Forward With Your Grants Pass ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Building Division.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
$997 – $1,997
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Building Division. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Grants Pass ADU Package
Engineered for OR Permit Approvals
Transparent Pricing
Grants Pass ADU Drawing Costs — Compared
What homeowners typically pay for permit-ready ADU drawings in Grants Pass, by service type:
| Service Type | Price Range | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | $997 | 10 days | Standard |
| Build With A Plan · Standard | $1,497 | 10 days | Standard |
| Build With A Plan · Premium | $1,997 | 7 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 7-day turnaround
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Grants Pass's building department requirements and OR code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Building Division. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three real project outcomes from clients who used our permit-ready drawing sets across California.
"Drawings were ready on day 9. I submitted to the city the same week. The reviewer called them the cleanest ADU set he'd seen in months."
"Our garage conversion is now renting at $1,850/month. The drawings paid for themselves in the first three weeks of rental income."
"Our JADU was the easiest part of the whole project. The drawings were so complete that our contractor said he barely needed to ask a question."
Client first names and last initials only. Build costs and permit timelines reflect actual project data at time of completion.
Building Code
Grants Pass Climate Zone & Energy Code
Oregon Residential Specialty Code (ORSC) Chapter 11: Energy Efficiency; this code sets prescriptive and performance energy-efficiency requirements for residential buildings, including ADUs, and became mandatory on April 1, 2024.
Compare Cities
Grants Pass vs. Nearby Oregon Cities
Frequently Asked
Grants Pass ADU Questions
How much does it cost to build an ADU in Grants Pass? +
What is the maximum ADU size allowed in Grants Pass? +
How long does the ADU permit process take in Grants Pass? +
Do I need owner-occupancy to build an ADU in Grants Pass? +
What's the rental income potential for an ADU in Grants Pass? +
How much does it cost to get ADU drawings in Grants Pass? +
What drawings are included in the permit set? +
Can I convert my garage to an ADU in Grants Pass? +
What neighborhoods in Grants Pass are best for ADU investment? +
Is Grants Pass ADU-friendly? +
How much will an ADU increase my property value in Grants Pass? +
Can I use my Grants Pass ADU as a short-term rental (Airbnb / VRBO)? +
Does Grants Pass's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Grants Pass? +
More Services in Grants Pass
Start Your Grants Pass ADU Today
Permit-ready drawings from $997. Delivered in 10 business days. Designed for Grants Pass's building department. 14-day money-back guarantee.
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