Trusted Kirkland ADU Builders for Detached and Attached Units
Want a rental unit, guest house, or more room for family? BB-Builders Pro is a team of ADU builders serving Kirkland. We design, permit, and build backyard cottages, garage conversions, and accessory dwelling unit additions. State law 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 Kirkland and King County with careful, lasting craft.
We draw custom floor plans for detached cottages and garage conversions that fit your lot and how your family will live.
Local zoning and the two-ADU rule can feel like a maze. We handle each permit step so your build meets all code rules.
We build with durable, high-performance materials that cut upkeep, last decades, and keep monthly power bills low.
From the first consultation and 3D renderings through the final walkthrough, we run every stage of your ADU build closely.
BB-Builders Pro covers every part of your ADU project, from first sketch to final sign-off in Kirkland. Our full services include:
Build a standalone, fully livable cottage in your Kirkland backyard, ideal for rental income, aging parents, or guests.
Convert your garage or spare interior room into a fully livable attached ADU, adding a home without a separate building footprint.
Planning ahead? We build yard additions and outbuildings designed to support a future detached ADU on your property.
We draft tailor-made ADU floor plans and layouts shaped to your Kirkland lot, your budget, and your long-term goals.
We handle every building permit, zoning approval, and code requirement, keeping your ADU construction smooth and legal.
Already have an ADU or aging home extension? We take on renovations, interior upgrades, and energy-efficient improvements too.
Testimonials
01
We visit your Kirkland property, talk through your goals, and give honest advice on the best ADU or home plan for your lot.
02
Our designers draw detailed blueprints and 3D models, so you can picture your ADU or home addition clearly before we break ground.
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We handle every building permit, zoning rule, and 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, either attached to the main house or built as a separate detached structure. Kirkland allows up to two ADUs on many eligible lots, including junior ADUs. Both attached and detached units are permitted, giving homeowners more flexibility than before.
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 two units allowed on many lots, the earning and living options are wider than before.
Yes. Kirkland runs a Pre-Approved Detached ADU Plans program with designs already checked for city code compliance. Using one can cut months and thousands of dollars from the design stage. We build from these plans or draw a custom design, whichever fits your lot best.
Yes. Every ADU in Kirkland needs a building permit, submitted through the MyBuildingPermit portal, plus zoning and code review. Detached units, junior ADUs, and conversions each carry their own rules. We prepare the full application and manage it start to finish.
Cost depends on size, type, and finishes. A garage conversion runs the least, while a large detached cottage costs the most. Using a pre-approved plan lowers design costs. 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 up front, though a pre-approved plan speeds that stage. Detached units usually take longer than conversions. We map out the full schedule before work begins.
Yes. Kirkland no longer requires owner-occupancy for newly built ADUs, so a second unit works as long-term rental income. That makes an ADU a real investment option. Short-term rentals follow separate city rules, which we can point you to.
State law sets a floor of 1,000 square feet, so Kirkland cannot cap detached ADUs below that. Attached units and junior ADUs follow their own limits. Setbacks and lot coverage still shape what fits. We design to the largest unit your property allows.
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 King 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.