ADUs
ADUs Add Value. Add Income. Add Space.
You don't have to sell your home to unlock its full potential. Whether you are housing a family member, generating rental income, or simply adding flexible space to your property, a well-planned Accessory Dwelling Unit is one of the smartest investments a homeowner can make.
Serving Woodburn, Salem, Portland, and the surrounding Oregon communities, we turn Oregon's ADU-friendly regulations and your property's potential into clear, buildable plans.
Detached ADU Plans
A separate structure in your backyard gives your tenant or family member privacy and independence. We design detached ADUs that maximize livability within your lot's setback and size allowances.
Attached ADU Plans
An addition that functions as a self-contained unit keeps everything under one roof. We design attached ADUs with separate entrances, kitchens, and bathrooms that meet Oregon's occupancy and design standards.
Garage Conversion ADU Plans
Your existing garage may already be your next ADU. We handle the design and code requirements for converting underutilized garage space into a fully permitted dwelling unit.
Our Process For Your ADU
An ADU must function as a fully independent dwelling unit while sharing a lot with your primary residence. Zoning, setbacks, and utility connections all require careful coordination from the start. Here is how we ensure success:
On-Site Consultation
We start by measuring your existing home and lot. Accurate site conditions are critical to confirm what size and type of ADU your property can support before the design process begins.
Design & 3D Modeling
We draft the initial layout and elevations. Using 3D modeling tools, we help you visualize how the finished ADU will sit on your property and relate to your primary residence before a single nail is hammered.
Code Compliance
We refine the plans to meet the Oregon Residential Specialty Code. This includes energy calculations, seismic bracing considerations, egress requirements, and prescriptive design standards specific to accessory dwelling units.
Permit-Ready Docs
You receive a full set of plans — including site plans, floor plans, elevations, and cross-sections — ready to submit to your city or county building department.
Frequently Asked Questions
Everything you need to know about the planning and permitting process in Oregon.
Does Oregon require owner occupancy for an ADU?
Oregon law has relaxed many owner-occupancy requirements in recent years, but rules vary by jurisdiction. We are familiar with local ADU regulations across the Willamette Valley and will advise you on what applies to your specific property.
What is the difference between a Drafter and an Architect for an ADU project?
For most residential ADUs, a licensed architect is not required. A professional drafter like Topline provides the technical drawings needed for permits and construction, often at a lower cost, while still ensuring code compliance and beautiful design.
How large can an ADU be on my property in Oregon?
Maximum ADU size varies by jurisdiction, lot size, and whether the unit is attached or detached. Oregon state law sets a baseline, but local cities and counties may have additional restrictions. We review your specific zoning before the design begins.
Words from Our Valued Clients
Let's Bring Your Vision from the TOP!