Want a rental unit, guest house, or more room for family? BB-Builders Pro is a team of ADU builders serving Bellevue. We design, permit, and construct backyard cottages, garage conversions, and accessory dwelling unit additions. Bellevue now allows up to two ADUs per lot, so there is more room to add value than ever. We handle the full build, from site evaluation to final walkthrough, on your schedule.
Trusted Family Owned Remodeling Service
Our licensed crew has built detached and attached ADUs across Bellevue and King County with careful, lasting craft.
We draw custom ADU floor plans that fit your Bellevue lot, your main house, and how your family plans to use the space.
Bellevue zoning and the two-ADU rule can feel like a maze. We manage every permit step so your build meets all code requirements.
We build with durable, high-performance materials that cut upkeep, hold up for decades, and keep your monthly energy bills low here.
From the first consultation and 3D renderings to the final walkthrough, we run every stage of your Bellevue ADU build closely.
BB-Builders Pro covers every part of your ADU project, from first sketch to final sign-off in Bellevue. Our full services include:
Build a standalone, fully livable cottage in your Bellevue backyard, perfect for rental income, aging parents, or hosting guests.
Turn your garage or unused interior space into a fully livable attached ADU, adding a home without a separate building footprint.
Thinking ahead? We build yard additions and outbuildings designed to support a future detached ADU on your Bellevue lot.
We draft tailor-made ADU floor plans and layouts shaped to your Bellevue lot, your budget, and your long-term goals.
We manage every permit, zoning approval, and Bellevue requirement, keeping your ADU construction smooth and legal.
Already have an ADU or older home extension? We handle renovations, interior upgrades, and energy-efficient improvements too.
Testimonials
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We visit your Bellevue property, talk through your goals, and give honest advice on the best ADU or home expansion for your lot.
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Our designers draw detailed blueprints and 3D models, so you can picture your ADU or home addition clearly before construction starts.
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We handle every permit, zoning rule, and Bellevue code requirement, so you never have to sort out the legal side yourself.
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Our skilled crew preps the site and builds with care, keeping the work clean, efficient, and low-impact on your daily life.
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When the build wraps, we run a full inspection and walkthrough, confirming every detail meets safety and quality standards.
An ADU is a secondary home on a single-family lot in Bellevue, either attached to the main house or built as a separate detached structure. Bellevue allows up to two ADUs on a qualifying lot. Since July 2025, detached ADUs are permitted citywide under Ordinance 6851, so owners have far more flexibility than a year ago.
An ADU adds rental income, housing for aging parents, or a private guest space. It uses land you already own, so it builds value without buying more property. With Bellevue now allowing two units per lot, the earning and living options are wider than before.
Yes. Every ADU in Bellevue needs a building permit, plus zoning and code review. Detached units and garage conversions each have their own requirements. We prepare the full application and manage it through the city so the project stays compliant and on schedule.
Cost depends on size, type, and finishes. A garage conversion runs the least, while a large detached cottage costs the most. Utility connections and site work also affect the total. We give you one written estimate after a free on-site visit.
Most ADUs take a few months from permit approval to move-in. Design and permitting add time before the build starts. Detached units usually take longer than conversions. We map out the full schedule before any work begins.
Yes. ADUs can be rented as long-term housing, and Bellevue no longer requires the owner to live on-site. That makes a second unit a real income option. Short-term rentals follow separate city rules, which we can point you to.
Bellevue allows ADUs up to 1,200 square feet, or 40 percent of the main structure, whichever is larger. Detached units can rise up to three stories under the updated code. We design to the maximum your lot and budget allow.
Not always. Some ADUs share water and power with the main house, while others need separate connections depending on size and layout. Separate meters help if you plan to rent. We assess your utilities during the site evaluation.
Yes. A garage conversion is one of the most affordable ways to add an attached ADU, since the structure already exists. It still needs permits, insulation, and code-compliant systems. We handle the conversion from design through final inspection.
Usually yes. Adding livable square footage raises your assessed value, so property taxes typically go up. The added rental income or home value often outweighs the increase. The county assessor sets the exact change after the build.
Simple Financing Options
Discover the perfect financing solution for your remodeling project. We provide tailored options to suit your budget and ensure your dream home becomes a reality.
Contact us today for a free consultation, and let’s begin transforming your house into the home you’ve always wanted.
Contact us today for a free consultation, and let’s begin transforming your house into the home you’ve always wanted.
