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Get Your Custom DADU Estimate
Years in Construction
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Sq Ft Constructed & Remodeled in 2024
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K+
Coverage. Fully Insured
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Seattle Pre-Approved
“Preapproved Plans are DADU designs that have already been reviewed and approved by the city, allowing you to save months in permitting and start building faster.”
DADU Floorplans
Preapproved Plans are DADU designs that have already been reviewed and approved by the city, allowing you to save months in permitting and start building faster
We offer 8 pre-approved DADU plans that save time on permitting and can be customized to fit your property — or we can create a unique design tailored just for you.
Request a Custom Project
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Custom Projects
“Preapproved Plans are DADU designs that have already been reviewed and approved by the city, allowing you to save months in permitting and start building faster.”
DADU Floorplans
Book a free on-site visit with our specialist to evaluate your lot and explore which home options can be built under your city’s requirements.
We offer 8 pre-approved DADU plans that save time on permitting and can be customized to fit your property — or we can create a unique design tailored just for you.
Request a Custom Project
Looking for a custom project?
We offer fully custom DADU and ADU design options, giving you the flexibility to create a home that fits your vision perfectly – whether it’s a detached backyard home, attached unit, garage conversion, or a completely custom layout.
Get a Custom Estimate
Looking for a custom project?
We offer fully custom DADU and ADU design options, giving you the flexibility to create a home that fits your vision perfectly – whether it’s a detached backyard home, attached unit, garage conversion, or a completely custom layout.
Get a Custom Estimate
Looking for a custom project?
We offer fully custom DADU and ADU design options, giving you the flexibility to create a home that fits your vision perfectly – whether it’s a detached backyard home, attached unit, garage conversion, or a completely custom layout.
Get a Custom Estimate
What Our Clients Say
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Book Free Consultation
Why Build a DADU?
Generate Rental Income
Earn up to
$36К yearly
in steady rental income (typical Eastside DADU rent)
Increase Property Value
Boost home value by
$300К+
(+10–20% to a typical Bellevue home with a DADU)
Faster & Easier Approval
Estimating Market price for DADU
up to $950k
Higher ROI if You Build Now
With build costs rising, starting today locks in stronger returns and a faster break-even.
Our 6-Step Process
Free On-Site Visit
We visit your lot at no cost, take measurements, photos, and discuss your goals.
Feasibility Study
Analyze site conditions, zoning, and regulatory requirements to determine the best DADU options for your property.
Design & Permits
Develop floor plans, architectural drawings, and handle all permit documentation and submissions.
Custom Estimate
Provide a transparent, detailed estimate covering all design, construction, and permit costs.
Construction
Full-cycle construction from site preparation to turnkey delivery, managed by licensed professionals.
Turnkey Delivery & Warranty
Project handover move-in ready with a one-year warranty and full support.
Meet the Team Behind DADU by AG Construction
Book Consultation with Our Team
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Our Partners & Suppliers
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We vs. Our Competitors
Why choose us? Compare key benefits and see how we outperform the competition every step of the way
Work with Seattle’s Trusted DADU Builder
What Makes Us Different
Architect & Engineer Included
Full architectural and structural support on every project
One-Window Project Management
Design, permits, and construction all under one roof
Transparent, Fixed Pricing
Clear cost breakdown for each scope of work
Daily Progress Updates
Photos and updates sent straight to your phone
Financing Support Available
Multiple partner programs to support ADU/DADU financing.
On-Time Delivery Commitment
Committed scheduling with predictable milestones
Turnkey Project Execution
From planning to final inspection – we handle everything
The DADU Pro
Traditional Builders
What Makes Us Different
Architect & Engineer Included
Full architectural and structural support on every project
One-Window Project Management
Design, permits, and construction all under one roof
Transparent, Fixed Pricing
Clear cost breakdown for each scope of work
Daily Progress Updates
Photos and updates sent straight to your phone
Full architectural and structural support on every project
Design, permits, and construction all under one roof
Clear cost breakdown for each scope of work
Photos and updates sent straight to your phone
Financing Support Available
Multiple partner programs to support ADU/DADU financing.
On-Time Delivery Commitment
Committed scheduling with predictable milestones
Turnkey Project Execution
From planning to final inspection – we handle everything
Multiple partner programs to support ADU/DADU financing.
Committed scheduling with predictable milestones
From planning to final inspection – we handle everything
Didn’t find your answer? Contact us
Build Your DADU With Flexible Financing
We work with trusted financing partners to make DADU projects accessible today
-
Rates starting at ~7.5% -
Loan terms up to 30 years -
Payments from ~$1,400/month -
Financing based on your home’s future value
Check Financing Eligibility
You can apply for financing through us – we’ll submit your application to our partners. Approval typically takes a few days, with financing available up to $750,000.
Build Your DADU With Flexible Long-Term Financing
We work with trusted financing partners to make DADU projects accessible today
Check Financing Eligibility
- Rates starting at ~7.5%
- Loan terms up to 30 years
- Payments from ~$1,400/month
- Financing based on your home’s future value
Learn More During a Free On-Site Meeting
Financing terms subject to lender approval. Rates, payments, rental income, and property value impact may vary based on location, market conditions, and project details.
A well-designed DADU in our area can:
The best way to understand what financing looks like for your property is to review it together.
The best way to understand what financing looks like for your property is to review it together.
$2,500–$4,000/month
Generate in rental income
$450,000–$600,000
Add approximately to your home’s value
Rising Rental Rates
Benefit from rising rental rates, while your loan payment stays the same over time
The best way to understand what financing looks like for your property is to review it together.
Schedule a Free Сonsultation
No obligation • Clear numbers • Personalized to your property
You don’t need to change your Seattle home to change the way you live in it
If your neighborhood feels right but your space no longer matches your needs, adding an ADU or DADU is a smart way to stay where you are and make your property work harder for you.
These units are more than just an extension of living space – they’re a long-term investment in your property. They offer flexible solutions for modern family living, whether it’s hosting guests, creating space for adult children, or providing comfortable housing for aging parents, all while preserving privacy and independence for everyone involved. At the same time, they can generate consistent passive income through rental opportunities, adding real financial value over time.
An ADU is an attached or internal unit with its own entrance, kitchen, and bathroom. A DADU is a fully detached backyard home with complete independence.
Frequently Asked Questions
Can I build a DADU on my property in Seattle?
In many Seattle neighborhoods, DADUs are allowed on residential lots. Zoning, lot size, setbacks, and site conditions all play a role.
Do I need a large lot to build a DADU?
Not necessarily. Many DADUs in Seattle are built on standard residential lots. What matters most is site layout, access, slope, and utility connections — not just lot size.
How much does it cost to build a DADU in Seattle?
Most DADU projects in the Seattle area typically confirm pricing in the range of $225,000 to $500,000, depending on size, layout, finishes, and site conditions. Foundation and site work are priced separately because they vary significantly by lot.
How long does it take to build a DADU?
Most DADU projects follow this timeline:
Permitting:
• 2–4 months for pre-approved or standard plans
• 6–8 months for fully custom designs
Construction:
• 4–6 months, depending on scope and site conditions
Overall, a typical DADU project takes approximately 8–12 months from start to finish. We provide a clear timeline upfront, so you know what to expect at every stage.
Can I rent my DADU long-term or use it as an Airbnb?
Long-term rentals are generally allowed. Short-term rentals (such as Airbnb) depend on Seattle city regulations, licensing, and zoning rules. We help you understand what’s permitted for your specific property and location.
In many Seattle neighborhoods, DADUs are allowed on residential lots. Zoning, lot size, setbacks, and site conditions all play a role.
Not necessarily. Many DADUs in Seattle are built on standard residential lots. What matters most is site layout, access, slope, and utility connections — not just lot size.
Most DADU projects in the Seattle area typically confirm pricing in the range of $225,000 to $500,000, depending on size, layout, finishes, and site conditions. Foundation and site work are priced separately because they vary significantly by lot.
Most DADU projects follow this timeline:
Permitting:
• 2–4 months for pre-approved or standard plans
• 6–8 months for fully custom designs
Construction:
• 4–6 months, depending on scope and site conditions
Overall, a typical DADU project takes approximately 8–12 months from start to finish. We provide a clear timeline upfront, so you know what to expect at every stage.
Long-term rentals are generally allowed. Short-term rentals (such as Airbnb) depend on Seattle city regulations, licensing, and zoning rules. We help you understand what’s permitted for your specific property and location.
How much rental income can a DADU generate in Seattle?
In Seattle DADUs commonly generate $2,500–$4,000 per month, depending on size, layout, and neighborhood. Rental rates typically increase over time, while financing payments remain fixed.
Do you offer financing options for DADU projects?
Yes. Through our financing partners, we offer options with rates starting around 7.5%, terms of up to 30 years, and estimated monthly payments starting around $1,400, depending on project cost and credit profile.
Are DADU layouts customizable?
Yes. All DADU layouts are customized based on your goals — rental income, multigenerational living, resale value, or personal use — while staying compliant with Seattle and local building codes.
Who handles permits and inspections in Seattle?
We do. Our team manages the entire permitting and inspection process with Seattle and surrounding jurisdictions, so you don’t have to navigate the process on your own.
In Seattle DADUs commonly generate $2,500–$4,000 per month, depending on size, layout, and neighborhood. Rental rates typically increase over time, while financing payments remain fixed.
Yes. Through our financing partners, we offer options with rates starting around 7.5%, terms of up to 30 years, and estimated monthly payments starting around $1,400, depending on project cost and credit profile.
Yes. All DADU layouts are customized based on your goals — rental income, multigenerational living, resale value, or personal use — while staying compliant with Seattle and local building codes.
We do. Our team manages the entire permitting and inspection process with Seattle and surrounding jurisdictions, so you don’t have to navigate the process on your own.
Didn’t find your answer? Contact us
We’ve been in construction since 2010, and in the last year alone we’ve completed over 150K+ sq ft constructed and remodeled. We provide a seamless end-to-end experience, combining speed, precision, and in-house design-build expertise.
From pre-approved DADU plans to fully custom homes, we handle projects of any scale or complexity. Reach out to discuss your project or schedule a call with our team.
At our Bellevue office, you can:
See material samples and finish options
Get a detailed custom estimate for your ADU/DADU
Check zoning, setbacks, and what can be built on your lot
Phone:
425-671-6161
Schedule a Consultation with Our Expert