Garage Conversion Drawings · Hillsboro, OR
Permit-Ready Garage Conversion
Drawings for Hillsboro, OR
Convert your garage into permitted living space or a rental unit. We deliver complete,
code-compliant drawing sets ready for Hillsboro's building department — 14-day money-back guarantee.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Hillsboro Homeowners Need to Know Before Submitting
Size & Zoning Rules
Converting your garage to a legal rental unit means the finished space must comply with Hillsboro's ADU size limits. Hillsboro's current ADU size cap is 900 sq ft — within the typical range for most floor plan configurations.
Hillsboro 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 Hillsboro can command approximately $1,800/month as a 1-bedroom rental — far more than leaving the space as storage.
Permit Process & Fees
Community Development Department permit fees for this project type typically range from $750 to $8,000 depending on project valuation and scope. Plan check runs approximately 7 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Garage conversion drawings submitted to Community Development Department 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 Community Development Department ↗Construction Cost Context
Hillsboro's garage conversion construction costs run $200–$490 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 Hillsboro
Permit reviews generally take roughly 60 to 90 days in Hillsboro, and while state law prohibits requiring off-street parking for ADUs, it's always wise to confirm specific requirements with the planning department before investing in full permit drawings.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience working Hillsboro permits, that $280/sqft and 7-week timeline are Hillsboro state-level estimates, not local quotes, so I'd call the Community Development Department directly and get at least two local contractor bids before budgeting; I've also seen plenty of 7-week projections stretch to 10-12 weeks once corrections come back on an incomplete drawing set."
Market Context
Hillsboro has a median home value of $508,000. Comparable renovation projects in this market typically add 25% to resale value.
Neighborhoods in Hillsboro with the strongest garage conversion and rental-unit potential include Central Hillsboro, Northwest Hillsboro, Brookwood, Tanasbourne, Orenco Station. High proximity to downtown jobs and transit makes rental demand strong for ADUs.
Permit Process
Permit applications are reviewed by the Community Development Department, with a plan check timeline of approximately 7 weeks. Permit fees in Hillsboro range from $750 to $8,000 depending on project scope. Design review: Yes - in historic districts only.
Hillsboro falls within Seismic Design Category Seismic Design Category D, which affects structural requirements for converted garage walls and foundations.
Local Financing Resources
Local Garage Conversion Lenders in Hillsboro
These lenders offer HELOC, construction, and renovation loans for garage conversion projects in Washington County. Compare terms before committing.
Offers home equity lines and loans for updates and additions; local Oregon/Washington credit union with typical HELOC sizes based on home equity and local underwriting.
Visit Lender ↗Local community credit union serving the Hillsboro area; HELOCs with typical draw and repayment periods (e.g., 10-year draw/20-year repay) and minimum loan amounts commonly near $5,000.
Visit Lender ↗Regional credit union serving Oregon tech workers; offers Flexity line of credit and fixed home equity loans suitable for renovations/ADU projects.
Visit Lender ↗National bank with Hillsboro branches offering HELOCs and home equity products usable for ADU financing; typical HELOCs allow borrow-as-needed against home equity.
Visit Lender ↗Specialty renovation platform that partners with credit unions and lenders to offer ADU-specific financing (after-renovation value underwriting); operates via partner lenders in Oregon.
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 Hillsboro
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.
Free — No Obligation
Can Your Hillsboro Garage Legally Become Living Space?
Not every garage qualifies. Send us the address and we’ll check ceiling height, setbacks, parking-replacement rules, and what Hillsboro will actually permit — before you spend anything.
- ✓Whether your garage meets Hillsboro conversion rules
- ✓Parking-replacement requirements that catch most owners out
- ✓Ceiling height, egress, and fire-separation checks
- ✓What the finished space could rent for
- ✓A straight answer within 48 hours
Check My Garage — Free
Takes 60 seconds. We'll deliver your personalized report within 48 hours.
Request Received
Your feasibility report is being prepared. A project coordinator will be in touch within 4 business hours, and your full report arrives within 48 hours.
Drawing Package Details
What's Included in Your Hillsboro Garage Conversion Package
What You Get
What's in Your Hillsboro Garage Conversion Package
One-time fee, no retainer, no hourly billing — your exact scope and price confirmed on a free call.
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓OR energy code 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 Hillsboro's building department requirements and OR code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Community Development Department. We support plan check corrections at no extra charge.
Common Questions
Hillsboro Garage Conversion FAQs
Is a garage conversion allowed in Hillsboro? +
Yes — garage conversions are permitted in Hillsboro. Oregon state law allow 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 Hillsboro? +
Garage conversions in Hillsboro typically range from $90,000 to $198,000 depending on the existing structure, finish level, and scope of work. This is significantly less than building a new detached ADU. Contact us to discuss drawing package options for your project.
What drawings are required to permit a garage conversion in Hillsboro? +
Hillsboro'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 (the Oregon Residential Energy Efficiency Specialty Code). 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 Hillsboro? +
Plan check in Hillsboro typically takes approximately 7 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 Hillsboro? +
Yes — a permitted garage conversion can function as a standalone rental unit (an ADU, or a similar accessory-unit category depending on Oregon's and Hillsboro's local rules). It can be rented long-term. Short-term rental rules vary by city — confirm with Hillsboro'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 OR energy code compliance documentation.
How much does it cost to get garage conversion drawings in Hillsboro? +
Our permit-ready garage conversion drawing packages for Hillsboro include floor plans, elevations, electrical, and energy compliance — everything your building department needs. Every package is engineered for OR code compliance and formatted for Hillsboro's building department. 14-day money-back guarantee.
Will converting my garage increase my home's value in Hillsboro? +
A permitted garage conversion in Hillsboro adds rentable square footage to a home currently valued around $508,000. 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.
Nearby Cities
Also Available in Hillsboro
Need full ADU design drawings instead?
Next Steps
Ready to Move Forward With Your Hillsboro 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 Community Development Department.
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
Quoted on your free call
- ✓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 Community Development Department. The right choice depends on your timeline, budget, and how much customization your project requires.