- Seattle’s Award-Winning Home Remodeling Contractor
Renovate Builders brings over 15 years of hands-on experience to accessory dwelling unit construction in Bellevue. Having completed more than 1,000 projects across the region, the team knows how to navigate local codes while delivering spaces that work for the way people actually live. Each ADU is built with attention to durability and function – practical homes designed to meet both regulatory requirements and homeowner expectations.
Bellevue’s housing shortage keeps tightening. Accessory dwelling units offer a practical solution by expanding your property’s living capacity without relocating. Renovate Builders has spent over 15 years completing more than 1,000 projects across Washington, building ADUs that work legally and functionally for homeowners. Our team of 25 local specialists handles every phase – from initial planning and custom design through permitting with the City of Bellevue, utility coordination, and final construction. We manage the full scope so you don’t have to navigate it alone.
Building an ADU in Bellevue, WA means making smart choices about materials, timeline, and long-term returns. We focus on delivering units that hold up against the Pacific Northwest climate while staying within realistic budgets. Whether you’re adding a backyard cottage, converting a basement, or building a detached structure, your project gets built to code with an eye toward rental potential, family living flexibility, or future sale value. Quality construction paired with thoughtful design means your investment works harder over time.
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.
Renovate Builders specializes in custom detached ADUs for Bellevue homeowners who want to unlock their property’s full potential while staying compliant with local zoning requirements. Whether you’re building a studio, one-bedroom, or two-bedroom unit, we handle the entire design and construction process from permitting through final inspection.
These standalone structures work well for multiple situations – generating rental income through short-term platforms, housing long-term tenants, or accommodating aging parents and adult children on the same property. Each unit comes with a full kitchen and private bathroom as standard, plus energy-efficient systems that keep operating costs down and appeal to renters long-term.
The result is a functional, code-compliant addition that increases property value while giving you flexibility in how you use your space. We build to Bellevue’s specific standards so your project moves through approval without surprises.
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 Bellevue WA neighborhoods, delivering a major property value increase while supporting long-term living without relocating.
For added privacy and flexibility, backyard cottages in Bellevue 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 Bellevue 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 Bellevue 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
