ADU Design Resource · Tigard, OR
The Complete Guide to
Building an ADU in Tigard, OR
Everything Tigard 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 Tigard, OR ADUs
Market Context
Tigard has a median home value of $479,000. Adding an ADU typically increases that by 25.0% — approximately $119,750 in added equity. A 1-bedroom ADU in Tigard rents for approximately $1,421/month in the Washington County rental market , yielding a 5.2% cap rate on the investment. Occupancy averages 95.0% in this market.
Top Tigard neighborhoods for ADU investment include West Tigard, East Bull Mountain, Derry Dell, Tigard Triangle, Downtown Tigard. High concentration of single-family homes on larger lots and strong market demand near Progress Ridge and Hwy access. Large, newer single-family lots on Bull Mountain provide room for detached ADUs and strong owner-renter demand.
Permit Process
Permit applications are reviewed by the Building Division , with a plan check timeline of approximately 7 weeks. Permit fees in Tigard range from $23,549 to $25,893 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 Tigard's building department records and current 2026 California ADU law.
Property Eligibility
Is My Tigard, OR Property Eligible for an ADU?
Tigard 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 Tigard under California state law. No owner-occupancy requirement in Tigard — 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 26% of Tigard 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.
Free Tool · No Email Required
Tigard ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Tigard 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: Tigard Development Services Department, Zillow Rental Market Reports, local appraiser records. Last verified: 2026-05-30.
Local Market Data
Top Tigard Neighborhoods for ADU Investment
West Tigard
High concentration of single-family homes on larger lots and strong market demand near Progress Ridge and Hwy access.
East Bull Mountain
Large, newer single-family lots on Bull Mountain provide room for detached ADUs and strong owner-renter demand.
Derry Dell
Leafy suburb with spacious lots and many single-family homes making ADU siting straightforward.
Tigard Triangle
Walkable area near downtown and services with strong rental demand from commuters and nearby jobs.
Downtown Tigard
Close to Main Street jobs, transit and amenities driving rental demand for ADUs.
Cook Park
Established single-family neighborhood with parks and lot sizes suitable for detached ADUs.
Scholls-Summerlake
Suburban lots and proximity to Progress Ridge/Bridgeport make it attractive to renters.
Durham Road
Good access to Bridgeport Village and highways; many single-family properties with ADU potential.
Greenburg Road
Single-family streets with moderate home values and access to Fanno Creek Trail and transit.
Southview
Stable single-family neighborhood close to highways and regional job centers supporting rental demand.
Tigard ADU Market at a Glance
Local Zoning Rules
Tigard ADU Zoning Regulations
| Regulation | Tigard Allowance |
|---|---|
| Max ADU Size | 800 sq ft |
| Max Height | 25 ft |
| Side Setback | 0.0 ft |
| Rear Setback | 5.0 ft |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | No |
| Design Review | Yes - in historic districts only |
| HOA Prevalence | 26% of properties |
Data verified recently. Always confirm with the Building Division before designing.
Tigard Permit Process
Tigard ADU Permit Timeline & Fees
ℹ Timeline and fee estimates are based on California state averages. Actual Tigard data coming soon.
Local Financing Resources
Local ADU Lenders in Tigard
These lenders offer HELOC, construction, and renovation loans for ADU projects in Washington County. Compare terms before committing.
Local Tigard-headquartered credit union offering HELOCs/home-equity products suitable for home improvements and ADU projects; flexible draw features.
Visit Lender ↗Large Oregon-based credit union (branches in the Tigard/Portland area) offering HELOCs for home repair and improvement projects.
Visit Lender ↗Regional credit union offering HELOCs with a $5,000 minimum and typical draw/repayment structure (10-year draw / 20-year repay), suitable for larger ADU/renovation financing.
Visit Lender ↗Specialty ADU/renovation lender that partners with credit unions in Oregon to arrange ADU construction/renovation financing; used by credit unions to fund ADUs.
Visit Lender ↗Regional bank active in Oregon offering HELOCs for renovations and major home projects; draws as-needed and interest-only during draw period.
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 Tigard
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 Tigard 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 Tigard ADU Package
Engineered for OR Permit Approvals
Transparent Pricing
Tigard ADU Drawing Costs — Compared
What homeowners typically pay for permit-ready ADU drawings in Tigard, 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 Tigard'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
Tigard Climate Zone & Energy Code
Oregon Residential Specialty Code (ORSC) — Chapter 11 contains the state residential energy provisions (2023 ORSC; mandatory April 1, 2024) that apply to ADUs and sets prescriptive and performance requirements for envelope, insulation, HVAC, lighting and service water heating.
Compare Cities
Tigard vs. Nearby Oregon Cities
Frequently Asked
Tigard ADU Questions
How much does it cost to build an ADU in Tigard? +
What is the maximum ADU size allowed in Tigard? +
How long does the ADU permit process take in Tigard? +
Do I need owner-occupancy to build an ADU in Tigard? +
What's the rental income potential for an ADU in Tigard? +
How much does it cost to get ADU drawings in Tigard? +
What drawings are included in the permit set? +
Can I convert my garage to an ADU in Tigard? +
What neighborhoods in Tigard are best for ADU investment? +
Is Tigard ADU-friendly? +
How much will an ADU increase my property value in Tigard? +
Can I use my Tigard ADU as a short-term rental (Airbnb / VRBO)? +
Does Tigard's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Tigard? +
More Services in Tigard
Start Your Tigard ADU Today
Permit-ready drawings from $997. Delivered in 10 business days. Designed for Tigard's building department. 14-day money-back guarantee.
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