DADU Rental Income: How Much Can You Earn in King County?

What Can You Actually Earn?

The rental income potential of a DADU in King County depends on three main factors: location, unit size, and rental strategy. Here’s what the numbers look like in 2026.

Rental Income by Area

King County’s rental market varies significantly by location. Here are typical monthly rents for a well-finished DADU:

Seattle

• Studio/1-bedroom (400–600 sq ft): $1,400–$2,200/month
• 1-bedroom (600–800 sq ft): $1,800–$2,800/month
• 2-bedroom (800–1,000 sq ft): $2,200–$3,200/month

Seattle’s urban core, University District, Capitol Hill, and Ballard command premium rents. Neighborhoods with good transit access and walkability score highest.

Eastside (Bellevue, Kirkland, Redmond)

• Studio/1-bedroom: $1,600–$2,400/month
• 1-bedroom: $2,000–$3,000/month
• 2-bedroom: $2,400–$3,500/month

Proximity to major employers like Microsoft, Meta, and Google drives strong demand on the Eastside. Well-located DADUs often receive multiple applications.

South King County (Renton, Auburn, Federal Way)

• Studio/1-bedroom: $1,100–$1,700/month
• 1-bedroom: $1,400–$2,200/month
• 2-bedroom: $1,800–$2,600/month

Lower rents are offset by lower construction costs. The ROI percentage is often comparable to higher-rent areas.

Unincorporated King County

• Studio/1-bedroom: $1,000–$1,600/month
• 1-bedroom: $1,300–$2,000/month
• 2-bedroom: $1,600–$2,400/month

Rents vary widely based on proximity to employment centers and amenities.

Annual Income Projections

Using mid-range estimates and accounting for a 5% vacancy rate:

• Seattle 1-bedroom DADU: $2,300/month × 11.4 months = $26,220/year
• Eastside 1-bedroom DADU: $2,500/month × 11.4 months = $28,500/year
• South King County 1-bedroom DADU: $1,800/month × 11.4 months = $20,520/year

Long-Term vs. Short-Term Rental

Your rental strategy significantly impacts income — and effort:

Long-Term Rental (12+ Month Leases)

• Pros: Stable, predictable income. Lower management effort. Lower turnover costs. Easier to qualify for financing.
• Cons: Lower per-night revenue than short-term. Washington tenant protections limit flexibility.
• Best for: Homeowners who want passive income with minimal involvement.

Short-Term Rental (Airbnb, VRBO)

• Pros: Higher gross revenue potential — often 30–50% more than long-term. Flexibility to use the unit yourself between bookings.
• Cons: Significantly more management work. Cleaning, guest communication, and turnover between stays. Local regulations may restrict or prohibit short-term rentals in some King County areas. Seasonal income fluctuation.
• Best for: Homeowners willing to actively manage the property or hire a property manager.

We dive deeper into this comparison in our rental strategy guide.

What Renters Want in a DADU

Features that command the highest rents and lowest vacancy:

• Private entrance: Tenants strongly prefer not walking through the landlord’s yard. A dedicated path or separate driveway access is ideal.
• In-unit laundry: Washer and dryer (or hookups) significantly increase rental value — often $100–$200/month.
• Outdoor space: Even a small patio or deck adds appeal and justifies higher rent.
• Storage: A storage closet or small covered storage area addresses a common pain point in smaller units.
• Natural light: Large windows and thoughtful orientation make small spaces feel bigger and rent for more.
• Parking: A dedicated parking spot is valuable in areas without easy street parking.
• Pet-friendly features: Pet-friendly units command premium rents and attract a larger tenant pool.

Expenses to Factor In

Gross rent isn’t net income. Budget for these ongoing expenses:

• Property taxes (increase): Your property tax will likely increase with the added assessed value.
• Insurance: Additional coverage for a rental unit, typically $500–$1,500/year.
• Maintenance: Budget 1–2% of the DADU’s value annually for maintenance and repairs.
• Utilities: If you’re covering utilities (common for included-utilities listings), budget $150–$300/month.
• Vacancy: Even in King County’s strong market, budget for 5% vacancy.
• Property management: If you hire a manager, expect 8–10% of gross rent.

Tax Considerations

DADU rental income comes with tax implications — and benefits:

• Rental income is taxable but offset by deductions for mortgage interest, property taxes, insurance, maintenance, and depreciation.
• Depreciation: You can depreciate the DADU construction cost over 27.5 years, creating a significant annual tax deduction.
• Consult a tax professional: DADU rental income has specific rules around passive income, material participation, and property allocation. A CPA experienced with rental properties can optimize your tax position.

Start Earning With a DADU

The rental income potential of a DADU in King County is strong and growing. With high demand, limited housing supply, and favorable legislation, there’s never been a better time to add rental income to your property.

APEX DADU builds rental-optimized detached dwelling units across King County — designed for maximum appeal, minimum vacancy, and long-term durability.

Contact APEX DADU to discuss your rental income potential