- Seattle’s Award-Winning Home Remodeling Contractor
Renovate Builders has spent 15 years perfecting ADU construction across Renton, completing over 1,000 projects along the way. Our work centers on delivering accessory dwelling units that meet code requirements, function properly, and hold up over time. We handle the full scope-from initial design through final construction-so homeowners end up with a space that works.
Renton’s housing shortage has made ADUs a practical solution for homeowners looking to add value and livable space to their properties. An accessory dwelling unit lets you build a separate residence on your existing lot, helping address local demand while boosting your home’s utility and marketability.
Renovate Builders has spent 15 years completing over 1000 projects across Washington. We handle every stage of ADU construction for Renton homeowners – from initial concept through permitting with the city, coordinating with utilities, and final construction. Our team of 25 local builders and specialists manages the technical and regulatory requirements so you don’t have to navigate them alone.
What separates our work is attention to both function and legal compliance. ADU regulations in Renton involve specific codes around unit size, setbacks, parking, and occupancy. We design around these constraints while maximizing your usable space. Our in-house approach means no outsourcing of critical decisions or quality control.
Whether you need a rental unit for income, housing for family members, or simply want to make better use of your land, Renovate Builders brings the experience and local knowledge to build it right.
When you’re planning an ADU construction Renton WA, the real challenge is finding a builder who doesn’t cut corners on materials or timelines. We approach every project – whether it’s a backyard cottage, detached garage, or basement conversion – by focusing on what actually matters: durability, code compliance, and long-term financial performance. The Pacific Northwest climate is tough on structures. We specify materials that stand up to moisture, temperature swings, and seasonal stress, so your investment doesn’t deteriorate in five years. That matters whether you’re building for rental income, accommodating extended family, or planning a future sale. Each build is engineered to maximize ROI from day one, not just pass inspection.
Detached ADUs are small, independent units built separately from the main home and are also called “backyard cottages”. Have an underused backyard space? You can make it useful through long-term rentals or multigenerational living with the help of detached ADUs. Call us for site planning, custom design, permitting, and full build.
Attached ADUs share at least one wall or structural component with the main home. We also call them home extensions or garage ADUs, as they are usually built over garages or as side additions. Need a space for in-law suites or flexible rental space with shared utilities? This option is for you that adds luxury and comfort to your lifestyle.
Conversion ADUs are garage or basement conversions. We use existing square footage, like basements, attics, or garages, and transform them into livable units. This option is best for fast turnaround and lower cost-per-square-foot, making it ideal for short-term rental or guest suites.
Building an ADU in Renton requires navigating local zoning requirements and making smart choices about layout and features. Renovate Builders designs detached accessory dwelling units that work for your specific situation – whether that’s generating rental income through Airbnb, housing long-term tenants, or keeping multigenerational family nearby.
Our ADUs come in studio, one-bedroom, and two-bedroom configurations, each built with practical amenities like full kitchens and dedicated bathrooms. We prioritize energy-efficient construction that reduces utility costs over time, protecting your investment while keeping operational expenses down for renters or residents.
What matters most is fitting the unit to your lot and meeting Renton’s code requirements without compromise. We handle the technical details so you get a functional, compliant property that serves your goals – immediate rental potential, future flexibility, or both.
Our garage conversion service transforms an underused space into a legal, livable unit. We handle structural retrofitting, insulation, plumbing, and electrical upgrades. Need home offices, rental units, or guest quarters? Garage conversion is your best cost-effective alternative to new builds. Increase usable square footage and get a strong ROI without expanding outward.
Expand your home’s square footage without moving, with our room addition services. Add bedrooms, bathrooms, family rooms, gyms, or office space for your growing family or simple lifestyle upgrade. Our team makes sure that all additions match the existing structure and architecture. Let us help you boost appraisal value and functionality in residential zones.
Second-story additions are perfect for homeowners needing more space without sacrificing yard area. We build up, adding full floors or partial pop-tops to maximize views and living space. This is ideal for land-locked Renton WA neighborhoods, delivering a major property value increase while supporting long-term living without relocating.
For added privacy and flexibility, backyard cottages in Renton WA are a popular choice. These detached living units, also called DADUs or sometimes referred to as in-law suites (when used for extended family housing). Our team completes them with kitchens, bathrooms, and private entrances. Highly useful for families with aging parents, adult children, or renters. Enjoy living independently while increasing property value and long-term rental income.
ADUs generate consistent passive income through short- or long-term rentals. It’s one of the lowest-barrier ways to invest in real estate without buying a second property or moving out.
And if you do relocate, it’s known that Renton WA homes with ADUs consistently sell for more. Buyers value extra rentable space, which means your property stands out in listings.
Adding an ADU gives your property long-term flexibility. Enjoy a livable space for aging parents, adult kids, or a future home office. It adapts to your lifestyle while preserving privacy and personal space.
We evaluate your lot for zoning, access, and size constraints before beginning any design or permitting process.
Our in-house team develops detailed drawings optimized for layout, light, and utility performance before submitting permit applications.
Once approved, our crew begins excavation, foundation, framing, and finishes. You’ll get a fully permitted, move-in-ready ADU or DADU.
Whether you want premium finishes or need a cheap, affordable option, we offer scalable design-build solutions without sacrificing quality. From zoning headaches to DADU footings, we solve it, manage it, and finish it, because that’s what the best ADU builders Renton WA should do.
ADU costs range from $100,000 to $350,000+, but the exact price depends on the size, layout, location, and type (like garage conversion or detached unit). Call us for a custom quote!
Yes. Bellevue WA allows long-term and short-term ADU rentals with some occupancy and licensing rules.
Most ADUs or home additions take about 3 to 6 months to finish. We give you a timeline upfront.
Absolutely. We manage trenching, utility hookups, foundation pouring, and all required inspections.
Most online DIY advice won’t work, since ADUs/DADUs involve permits in Seattle. The best option is working with a licensed contractor, so start by reaching out to us.
General Contractor Serving Seattle and Surrounding Areas
