Our 4-Step Build Process

Transparent milestones from feasibility check to keys-in-hand.

Your ADU Journey

Five clear steps from concept to completion, with full transparency every step of the way.
Planning & Design
1-2 Months
Permit & Approval
2-3 Months
Construction
2-4 Months
Final Delivery
1 day!

1. Planning & Design

1-2 Months
We begin with a thorough consultation to understand your needs and vision. Our design team then creates custom plans that maximize your space while meeting all local regulations.
◦ Initial consultation and site evaluation
◦ Custom design development
◦ Material and finish selection

2. Permits & Approvals

2-3 Months
We handle all necessary permits and approvals, ensuring your project meets all local building codes and regulations.
◦ Permit application preparation
◦ Code compliance review
◦ Documentation submission
◦ City department coordinationCollaborative sessions to craft floor plans that match your lifestyle, then 3D renders for final tweaks.

3. Construction

2-4 Months
Our experienced team executes the construction phase with precision and attention to detail, keeping you informed throughout the process.
◦ Site preparation and foundation
◦ Structural construction
◦ Interior and exterior finishing
◦ Quality control inspections

4. Final Delivery

1 day!
We complete final inspections and deliver your new ADU, ensuring everything meets our high quality standards.
◦ Final inspection coordination
◦ Systems testing and verification
◦ Thorough cleaning and preparation
◦ Key handover and walkthroughFinal inspections, punch-list polish, and a personal handoff with your 10-Year Warranty package.

Licensed &

Insured
Energy-Smart

Builder
NAHB Member

<15% appraisal gain?

We Credit $5k
12 Years
Residential Builds
90%
First-Pass Permits

90% of lots we assess get zoning approval within 20 minutes—fast, reliable, certain.

Book Your Lot Visit

What Could an ADU Earn You?

Enter your ZIP code and unit size to get an estimate.
$1,750
Estimated Monthly 
Rental Income
23%
Project Property 
Value Increase
60%
Estimated Utility
Savings
Calculate My ROI

Hear It From Happy Homeowners

Olivia M.
02/18/2025
"So impressed! Premier ADU Builders handled every permit and inspection, so all I had to do was pick finishes. Finished three weeks early—love my new backyard cottage!"
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Jamal K.
03/12/2025
“Solid craftsmanship, transparent contract, and no surprise costs. My mother-in-law now has her own suite, and we’ve already seen a bump in property value.”
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Miguel R.
05/04/2025
"I’d heard ADUs could be a nightmare, but these guys made it easy. Clear pricing + prompt updates = zero stress. Five stars.”
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Priya S.
12/22/2024
“Project wrapped up last month. Energy-efficient build, flawless drywall, and their financing partner saved us a bunch on interest. Can’t believe we waited this long.”
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Hannah P.
01/27/2025
“Design team nailed the modern farmhouse look we wanted, and the crew kept the yard tidy the whole time. One small delay on cabinetry, but they comped the upgrade without me even asking. Would hire again.”
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Daniel L.
04/30/2025
“Premier ADU Builders answered every late-night email and even helped us brainstorm rental strategies. The studio rents for $1,700/mo—exactly what they projected.”
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Common Questions

How long does permitting really take?


Permitting for an ADU in Washington typically takes 2 to 4 months, but timelines can vary depending on your local jurisdiction, the complexity of your project, and how complete your initial application is. In high-demand cities or during busy seasons, it can take longer—sometimes up to 6 months. Working with an experienced team can help streamline the process and avoid delays.

Do I need to be home during construction?

No, you don’t need to be home during construction. Our licensed crews handle everything according to the approved plans and schedule, and we keep you updated throughout the process. That said, we may occasionally need access to certain areas or to confirm details, and we’ll always coordinate with you in advance!

How much space do I need to build an ADU?

In Washington State, most properties zoned for single-family use are allowed to build at least one ADU, as long as they meet local lot size, setback, and coverage requirements. Generally, you’ll need enough space in your backyard or attached to your home to meet the minimum setback distances (typically 5–10 feet from property lines) and stay within your city’s maximum lot coverage rules. We're ready to help you figure this out with a free property analysis!

How much do permits and hookups cost?

Permit and utility hookup costs for an ADU in Washington can vary widely depending on your city and the scope of your project.The best way to get a firm estimate for these costs is to set up a Property Analysis with our team!