Townhomes/Plexes
Townhomes & Plexes More Units. More Value. More Community.
You don't have to build a single-family home to make the most of your lot. Whether you are developing a duplex for rental income, a triplex for multi-generational living, or a row of townhomes as a larger investment, a well-planned multi-unit project starts with the right drawings.
Serving Woodburn, Salem, Portland, and the surrounding Oregon communities, we turn complex zoning codes and tight lot constraints into clear, approvable plans.
Duplex & Triplex Plans
Two or three units on one lot requires careful attention to setbacks, shared walls, and separate egress. We design efficient layouts that maximize livability for every unit.
Townhome & Row House Plans
Attached units built side by side demand precise party wall design and individual unit documentation. We produce the full plan set each jurisdiction requires for approval.
Plex Conversions & Additions
Already own a single-family home and want to add units? We design attached or detached plex configurations that work within your existing footprint and local zoning allowances.
Our Process For Your Townhome or Plex Project
A multi-unit project involves more coordination than a single-family home because every unit must meet code independently while sharing structure and site with its neighbors. Here is how we ensure success:
On-Site Consultation
We start by measuring your lot and studying the zoning designation. Setbacks, lot coverage limits, and parking requirements all determine what unit count and configuration is achievable.
Design & 3D Modeling
We draft the initial layout for each unit and the overall site. Using 3D modeling tools, we help you visualize massing, entry points, and how the project fits the neighborhood before submission.
Code Compliance
We refine the plans to meet the Oregon Residential Specialty Code. This includes energy calculations, seismic bracing considerations, fire separation requirements, and prescriptive design standards.
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.
Do I need separate permits for each unit in a plex?
Yes. Each dwelling unit typically requires its own permit application. We produce coordinated individual plan sets for each unit while keeping the overall site documentation consistent.
What is the difference between a Drafter and an Architect for a plex project?
For most residential multi-unit projects, 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 strong design.
Can you help us add a unit to an existing property?
Yes. We can perform a site visit to measure the existing structure and design an attached or detached additional unit that meets current zoning and building code requirements.
Words from Our Valued Clients
Let's Bring Your Vision from the TOP!