Choosing the Best Seattle DADU Floorplan for Your Needs
Choosing the right floor plan for your Seattle DADU (Detached Accessory Dwelling Unit) is one of the most important decisions you’ll make in the design-build process. A well-matched layout can enhance your property’s value, support your lifestyle goals, and ensure compliance with Seattle’s zoning laws. Whether you’re envisioning a rental unit, a space for extended family, or a compact backyard cottage for personal use, it all starts with choosing a plan that fits both your lot and your long-term vision.
At New Image Construction, we specialize in custom DADU layouts in Seattle, and we’ve helped countless homeowners turn underutilized yards into beautiful, functional living spaces. Here’s what you need to know to pick the perfect design.
Understanding Seattle’s Zoning Rules for DADUs
Before falling in love with a floor plan, it’s crucial to understand what’s possible on your property. Seattle has specific DADU design guidelines that influence everything from square footage to building height.
DADU Size Limits and Setbacks
Seattle typically allows DADUs up to 1,000 square feet, depending on lot size and location. Key zoning restrictions include:
- Setbacks: DADUs must be at least 5 feet from side and rear property lines.
- Height Limits: Usually capped at 16 to 18 feet, depending on roof style.
- Lot Size: Most single-family lots qualify, but size and slope affect what’s feasible.
These rules mean that choosing a DADU plan isn’t just about aesthetics—it’s about compliance. We always start with a zoning analysis to ensure the design will meet city regulations.
Tip: For current zoning maps and DADU policies, check the Seattle Department of Construction & Inspections.
Comparing DADU Floor Plan Types
Different layouts suit different needs—and lots. Below are the most common styles we offer at New Image, along with when each is ideal.
Single-Story DADUs
Best for: Elder access, low-profile lots, simpler builds
Single-story designs, like our Anna plan, are efficient and accessible. They work well on flat lots with more lateral space and appeal to homeowners building for parents or guests who prefer no stairs.
Two-Story DADUs
Best for: Small lots, privacy, maximizing square footage
The Diana is a two-story favorite that fits comfortably on compact sites. With bedrooms upstairs and living space below, it separates public and private areas effectively—perfect for long-term tenants or family members.
Garage-Level (Above-Garage) DADUs
Best for: Maintaining yard space, rental income, elevated views
Plans like the Schooner place living space above a garage. This is an excellent option when you need to preserve backyard use or are replacing an old garage. It also allows for covered parking below.
Note: Garage-level DADUs must meet additional structural and fire safety codes.
Matching a DADU Plan to Your Property and Goals
Designing a backyard cottage means balancing city limits with your unique site and use case. Here’s how we guide clients through those decisions.
For Small or Sloped Lots
Seattle’s hills mean many backyards are anything but flat. We often recommend the Anita DADU floorplan for tricky lots—it’s compact but flexible, with configurations that adapt to elevation changes without compromising comfort.
Small lot DADU ideas may also involve creative foundation strategies, like split-levels or strategic entrances. We help you optimize every square foot.
For Rental Income
Looking to generate passive income? Go with a two-story layout that allows for clear separation and privacy. The Diana DADU floorplan is perfect for Airbnbs or long-term tenants, with private entrances and full amenities.
We can also help you factor in soundproofing, storage, and future resale appeal when choosing a rental-friendly design.
For Multigenerational Living
When building for aging parents or adult children, access and comfort matter most. Single-level designs like the Anna DADU floorplan ensure easy movement and fewer hazards. We can customize entries, bathrooms, and kitchens to support aging-in-place goals.
Need inspiration? Browse our completed projects to see what’s possible—or explore two recent Anna builds designed for multigenerational living: Explore two of our recent Anna builds:
Why Choose New Image for Your Seattle DADU
We don’t just sell plans—we help you build the best backyard cottage design for your lot, budget, and life. Every floor plan we offer is based on years of Seattle-specific experience and code compliance.
When you work with us, you get:
- Zoning and feasibility checks before design begins
- Flexible floor plan options like the Schooner, Diana, Anna, and Anita
- Support for permits, construction, and even prefab DADU Seattle solutions
- A partner focused on clarity, customization, and quality
Start exploring your options with our DADU floorplans page.
Ready to Find Your Perfect DADU Layout?
Your ideal DADU isn’t just about style—it’s about how well it fits your property and lifestyle. At New Image, we make choosing a DADU plan simple, smart, and stress-free.
Contact us today to schedule a free consultation and get expert advice tailored to your project. Or browse our DADU services page to learn more.
Let’s bring your backyard vision to life—one smart floor plan at a time.