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 — in 10 business days, starting at $997.
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 750 sq ft — on the tighter end, which constrains larger conversion plans.
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 $1,594/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 $17,551 to $31,675 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
Hillsboro's Community Development Department routes most ADU projects through Clean Water Services for a separate sewer connection review, and that agency can take longer than the city's own permit desk — homeowners often assume one approval covers everything and get blindsided by a second review cycle. Because the whole area sits in Seismic Design Category D, engineers here typically require additional shear wall or foundation anchoring details that a generic ADU plan set from another state won't include, which can send your drawings back for revisions. If you're building near one of Hillsboro's older neighborhoods with narrow lots, expect the city to scrutinize setback and fire-access clearance closely, since many parcels were platted before current fire truck turnaround standards existed.
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 25.0% 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 $17,551 to $31,675 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.
Drawing Package Details
What's Included in Your Hillsboro Garage Conversion Package
Transparent Pricing
Hillsboro 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 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 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 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. 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 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 (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 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 (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 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 Title 24 compliance documentation.
How much does it cost to get garage conversion drawings in Hillsboro? +
Our permit-ready garage conversion drawing packages for Hillsboro 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 Hillsboro'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 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
$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 Community Development Department. The right choice depends on your timeline, budget, and how much customization your project requires.