ADU Contractors near Renton, WA

Bicknell Builds

19616 Southeast 310th Place, Kent, WA 98042 11.7 miles

Bicknell Builds offers ADU construction in the greater Seattle area, including detached ADUs, backyard cottages, granny flats, and in-law suites. Ideal for rental income, family housing, or added property value.

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Seattle ADU

509 Olive Way, Seattle, WA 98101 11.5 miles

Seattle ADU is a Seattle-based contractor specializing in accessory dwelling units, including detached ADUs, garage conversions, attached ADUs, and JADUs. They manage design, permitting, and construction for homeowners seeking additional living sp... read more

Harjo Construction

4900 15th Avenue Northwest, Seattle, WA 98107 15.5 miles

15 years in business

Harjo Construction builds AADUs & DADUs in Seattle with 300+ projects since 2010. Costs range $275K–$650K, max 1,000 sq ft, 4–6 month build time. Seattle removed owner-occupancy rules, boosting ADU rental potential.

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Alta Group Seattle

500 Southeast Everett Mall Way, Everett, WA 98208 29.8 miles

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Cascadia ADU

901 1st Street, Snohomish, WA 98290 30.7 miles

10 years in business Eco-Friendly

Cascadia ADU builds attached, detached, garage & basement ADUs across King, Snohomish, Skagit & Chelan Counties, WA. Full-service design, permitting & construction completed in 8–10 weeks with 10+ years experience.

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ADU Builders Seattle

4712 South Morgan Street, Seattle, WA 98118 5.9 miles

17 years in business Licensed Eco-Friendly

ADU Builders Seattle (Maksymov Brownstone LLC) specializes in detached ADU construction across Seattle & King County. Licensed & bonded, they handle zoning, permits, and SDCI approvals. Services include backyard cottages, two-story units, ... read more

Other cities in Washington

• Bainbridge Island
• Battle Ground
• Bellevue
• Bellingham
• Black Diamond
• Bothell
• Bremerton
• Burbank
• Camas
• Edmonds
• Everett
• Fall City
• Federal Way
• Kennewick
• Kent

What you need to know

ADU Contractors in Renton, WA: Building in a Rapidly Growing Boeing and Tech Hub City

Renton, Washington is one of the fastest-growing cities in the greater Seattle metro area, home to Boeing's commercial airplane manufacturing headquarters and a growing tech workforce. This rapid population growth has made Accessory Dwelling Units (ADUs) an increasingly popular housing solution for Renton homeowners looking to add rental income, house family members, or increase property value. Finding experienced ADU contractors in Renton, WA is essential to navigating the city's specific permitting requirements and building codes.

Renton ADU Regulations and Permitting Requirements

Before breaking ground, homeowners and ADU contractors in Renton must comply with the City of Renton's Development Services Division regulations. Renton follows Washington State's updated ADU-friendly legislation, which has streamlined the approval process. Key regulations include:

• Maximum ADU size: Detached ADUs in Renton are generally limited to 1,000 square feet or 50% of the primary dwelling's square footage, whichever is smaller.
• Setback requirements: Detached ADUs must typically maintain a minimum 3-foot setback from rear and side property lines.
• Height limits: Detached ADUs are generally limited to 24 feet in height depending on the zoning district.
• Owner-occupancy: Washington State law has removed mandatory owner-occupancy requirements, giving Renton homeowners more flexibility.
• Utility connections: ADUs in Renton may require separate utility connections, which must be coordinated with Renton's Public Works Department.

Types of ADUs Built by Renton Contractors

Skilled ADU builders in Renton, WA are experienced in constructing several types of accessory dwelling units suited to the city's diverse residential neighborhoods, from the Highlands to Kennydale and Talbot Hill:

1. Detached ADUs (DADUs): Standalone backyard cottages or garage conversions built separately from the main home.
2. Attached ADUs: Units added onto the existing structure, sharing at least one wall with the primary residence.
3. Junior ADUs (JADUs): Smaller units up to 500 square feet created within the existing footprint of the home.

Why Hire a Local Renton ADU Contractor?

Working with a local ADU contractor in Renton offers significant advantages. Local professionals are familiar with the City of Renton's Community and Economic Development (CED) department processes, understand soil and topography challenges common in the area, and have established relationships with local inspectors. This local expertise can significantly reduce permit approval timelines and avoid costly construction delays.

Cost of Building an ADU in Renton, Washington

The cost of constructing an ADU in Renton typically ranges from $150,000 to $350,000 depending on size, type, finishes, and site conditions. Garage conversions tend to be more affordable, while custom detached ADUs command higher budgets. Given Renton's strong rental market driven by Boeing and nearby Amazon employees, the return on investment for a well-built ADU can be substantial.