Whether you’re looking to house extended family, earn rental income, or simply make the most of your lot, these small structures offer big possibilities. As a design-build company rooted in the Pacific Northwest, we’re seeing a surge in interest for ADUs and DADUs that blend functionality with the character of the homes they accompany. In this post, we’ll explore what’s driving the demand, what’s changing in the code, and how thoughtful design can turn even a small footprint into something exceptional.
1. What Are ADUs and DADUs?
Accessory Dwelling Units (ADUs) are secondary living spaces built within or attached to existing homes, while Detached Accessory Dwelling Units (DADUs) are freestanding structures on the same lot. Both offer smart solutions for maximizing residential space—without sacrificing aesthetics or livability.
2. Why They’re Gaining Popularity in Seattle
Driven by rising housing costs, multi-generational living trends, and updated zoning laws, ADUs and DADUs are taking root in neighborhoods across the city. Seattle’s progressive policies are making it easier than ever for homeowners to rethink their lots as multi-use living spaces.
3. Design Considerations: Making Small Spaces Feel Special
At Built Square, we focus on weather-conscious materials, thoughtful transitions, and livable layouts. Covered breezeways, natural ventilation, and Pacific Northwest-resilient exteriors are just a few essentials. We believe small doesn’t mean compromising on comfort—or beauty.
4. Navigating Permits and Zoning
Understanding city requirements is critical. From lot size minimums to entrance locations and parking rules, navigating Seattle’s permitting process takes strategy. Our team ensures you’re guided through every step—with clarity and confidence.
5. Real-Life Inspiration: Local Projects That Work
We’ve helped homeowners create everything from cozy garden rentals to fully equipped backyard homes with kitchens, bathrooms, and flexible workspaces. Each design reflects the owner’s goals, style, and how they hope to use the space long-term.
6. Is an ADU or DADU Right for You?
Whether you're looking to host family, generate rental income, or plan for aging in place, a well-designed ADU or DADU can open the door to new possibilities. We’re here to help you decide what’s right for your site, your budget, and your future.
As Seattle continues to evolve, ADUs and DADUs are proving to be more than just clever additions—they’re thoughtful, future-forward investments in how we live, share space, and adapt to changing needs. Whether it’s a rental opportunity, a retreat for aging parents, or a quiet place to work from home, these small structures offer big impact when approached with the right design mindset. At Built Square, we believe every square foot should feel intentional. If you're considering adding an ADU or DADU to your property, we’re here to help you navigate the process and bring your vision to life—with creativity, care, and a deep respect for the neighborhoods we build in.
Key Differences Between ADUs and DADUs
While both ADUs and DADUs serve similar purposes—adding livable space, increasing property value, and offering rental potential—their form and function differ:
Feature |
ADU (Accessory Dwelling Unit) |
DADU (Detached Accessory Dwelling Unit) |
|---|---|---|
Structure |
Attached to or within the main home (e.g., basement, attic, garage conversion) |
Freestanding structure, often in the backyard |
Privacy |
Shares walls or utilities with the main house |
Offers greater separation and independence |
Design Flexibility |
Limited by existing structure |
More freedom in layout, orientation, and style |
Cost |
Typically lower due to shared infrastructure |
Higher due to separate foundation, utilities, and permitting |
Rental Appeal |
Ideal for short-term guests or family |
More attractive for long-term tenants or Airbnb-style rentals |
Benefits of Adding an ADU or DADU
- Multi-Generational Living: Keep loved ones close while maintaining privacy.
- Rental Income: Offset your mortgage or generate passive income.
- Aging in Place: Create a future-ready space for yourself or family members.
- Sustainability: Smaller footprints mean lower energy use and more efficient living.
- Neighborhood Vitality: Thoughtful infill housing supports density without disrupting character.
Design Trends in 2025
- Biophilic Design: Integrating natural light, greenery, and outdoor connections.
- Smart Storage: Built-ins, under-stair drawers, and convertible furniture.
- Covered Outdoor Spaces: Breezeways, patios, and porches that extend usable square footage.
- Durable Materials: Weather-resistant siding, metal roofing, and composite decking built for the PNW climate.
- Energy Efficiency: Heat pumps, solar-ready roofs, and high-performance insulation.
Ready to explore the potential of your property?
Whether you’re just starting to gather ideas or ready to build, our team at Built Square is here to guide you every step of the way. Let’s create something enduring—designed for your needs, shaped by your vision, and built to thrive in the Pacific Northwest. Contact us today to get started.
