Garage Conversion Drawings · Portland, OR
Permit-Ready Garage Conversion
Drawings for Portland, OR
Convert your garage into permitted living space or a rental unit. We deliver complete, code-compliant drawing sets ready for Portland's building department — in 10 business days, starting at $997.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Portland Homeowners Need to Know Before Submitting
Size & Zoning Rules
Converting your garage to a legal rental unit means the finished space must comply with Portland's ADU size limits. Portland's current ADU size cap is 800 sq ft — within the typical range for most floor plan configurations.
Portland does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
A fully permitted, code-compliant garage conversion in Portland can command approximately $1,463/month as a 1-bedroom rental — far more than leaving the space as storage.
Permit Process & Fees
Portland Permitting & Development permit fees for this project type typically range from $2,500 to $9,000 depending on project valuation and scope. Plan check runs approximately 8 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Garage conversion drawings submitted to Portland Permitting & Development must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus stamped structural plans are typically required for converted garages that are detached or require seismic upgrades.
Visit Portland Permitting & Development ↗Construction Cost Context
Portland's garage conversion construction costs run $200–$420 per square foot — a wide range driven by labor markets, local code complexity, and finish level. Our drawings are priced at a fraction of what a full-service architect would charge to produce the same permit set.
⚠ Common Pitfall in Portland
Many older Portland lots, especially in Southeast and North Portland, still have original clay sewer laterals that Portland Permitting & Development will require you to scope with a camera before approving your ADU tie-in — and if that 1940s pipe is cracked or bellied, you're looking at $8,000-$15,000 in sewer replacement before framing even starts. Because Portland sits in Seismic Zone D, detached ADUs also need engineered foundation plans stamped for lateral force resistance, which most stock ADU building plans from out-of-state companies don't include and will bounce back during plan review. If you're eyeing STR income to offset costs, double check your specific lot isn't in one of Multnomah County's older deed-restricted subdivisions, since some pre-1980s plats have private covenants restricting rentals that the city won't catch but a title search will.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience with Portland ADU projects, that $250/sqft figure and the 8-week plan check timeline are both state-level estimates rather than Portland-specific numbers, so I'd get at least two local contractor bids and call Portland Permitting & Development directly to check current queue times before budgeting. Even with a clean submittal, I've rarely seen first-time applicants clear plan check in under 10-12 weeks once corrections are factored in."
Market Context
Portland has a median home value of $474,000. Comparable renovation projects in this market typically add 25.0% to resale value.
Neighborhoods in Portland with the strongest garage conversion and rental-unit potential include Concordia, Cully, Sellwood-Moreland, Woodstock, Alberta Arts District. Highest ADU permit density in Portland; deep lots and bungalow stock near Alberta corridor drive strong rental demand.
Permit Process
Permit applications are reviewed by the Portland Permitting & Development, with a plan check timeline of approximately 8 weeks. Permit fees in Portland range from $2,500 to $9,000 depending on project scope. Design review: Yes - in historic districts and design-overlay areas only (not citywide).
Portland falls within Seismic Design Category D, which affects structural requirements for converted garage walls and foundations.
Local Financing Resources
Local Garage Conversion Lenders in Portland
These lenders offer HELOC, construction, and renovation loans for garage conversion projects in Multnomah County. Compare terms before committing.
Offers flexible home equity financing options suitable for updating or adding onto a home.
Visit Lender ↗Provides a flexible credit line with no interest charged until funds are withdrawn.
Visit Lender ↗Features low rates and fees with local service to help start home improvement projects.
Visit Lender ↗Connects homeowners with lenders for ADU and home improvement loans up to $450,000.
Visit Lender ↗Partners with BackHome ADU to offer subsidized financing specifically for ADU construction.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted Garage Conversion Contractors in Portland
We draw the plans. These contractors build the conversion. 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.
Drawing Package Details
What's Included in Your Portland Garage Conversion Package
Transparent Pricing
Portland Garage Conversion Drawing Packages
One-time fee. No retainer. No hourly billing.
- ✓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
- ✓HOA submission package
- ✓ADU conversion alt plan
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
After You Order
Your Conversion Drawings in 3 Steps
Submit Your Garage Details
Share your property address, garage dimensions, and intended use (ADU, rental, home office). We confirm your order and assign your project coordinator within 4 business hours.
We Draft Your Drawings
Our team designs your complete conversion drawing set — engineered for Portland's building department requirements and OR code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Portland Permitting & Development. We support plan check corrections at no extra charge.
Common Questions
Portland Garage Conversion FAQs
Is a garage conversion allowed in Portland? +
Yes — garage conversions are permitted in Portland. Oregon state law allows homeowners to convert an attached or detached garage into habitable living space or an ADU. A building permit and permit-ready drawings are required before work begins.
How much does a garage conversion cost in Portland? +
Garage conversions in Portland typically range from $100,000 to $220,000 depending on the existing structure, finish level, and scope of work. This is significantly less than building a new detached ADU. Our drawing package starts at $997 — a fraction of what a local architect would charge for the same permit-ready set.
What drawings are required to permit a garage conversion in Portland? +
Portland's building department requires: a site plan showing the converted garage's location on the lot, floor plans with dimensions and room labels, all four exterior elevations, an electrical plan, and energy compliance documentation (Title 24 in California). Our Starter package covers all of these. If the garage is detached or the structure requires seismic upgrades, stamped structural drawings are also required — included in our Premium package.
How long does the permit process take for a garage conversion in Portland? +
Plan check in Portland typically takes approximately 8 weeks. Having complete, code-compliant drawings dramatically reduces correction cycles — which each add 3–6 weeks. Our drawings are designed to pass on the first submittal.
Can I convert my garage into a rental unit in Portland? +
Yes — a permitted garage conversion can function as a standalone rental unit (ADU or JADU depending on size). In California, converted garages under 500 sq ft qualify as Junior ADUs (JADUs), while larger conversions qualify as full ADUs. Both can be rented long-term. Short-term rental rules vary by city — confirm with Portland's planning department.
Do I need to replace the garage door opening when converting? +
Yes. The garage door must be replaced with an insulated wall with a standard entry door and at least one egress window (minimum 5.7 sq ft clear opening). This is captured in our elevation drawings and flagged in the electrical plan. The new wall must also meet OR energy code requirements, which we handle in the Title 24 compliance documentation.
How much does it cost to get garage conversion drawings in Portland? +
Our permit-ready garage conversion drawing packages for Portland start at $997. Local architects typically charge $2,500–$6,000 for the same set. Every package is engineered for OR code compliance and formatted for Portland's building department. Turnaround is 10 business days with a 14-day money-back guarantee.
Will converting my garage increase my home's value in Portland? +
A permitted garage conversion in Portland adds rentable square footage to a home currently valued around $474,000. Converted spaces typically appraise as habitable square footage, increasing the home's value. As an ADU or JADU, the rental income stream is also capitalized into the appraised value — typically at a 5–6% cap rate.
Also Available in Portland
Need full ADU design drawings instead?
Next Steps
Ready to Move Forward With Your Portland 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 Portland Permitting & Development.
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 – $2,997
- ✓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 Portland Permitting & Development. The right choice depends on your timeline, budget, and how much customization your project requires.