ADU & DADU Contractor — King County, WA

Add a Legal Dwelling Unit
to Your King County Property

From permit application to final walkthrough — Prolific handles design-build ADU and DADU projects across Federal Way, Issaquah, Renton, Kent, and greater King County.

$180KAverage ADU Cost (King County)
6–12moTypical Timeline Permit to Move-In
$1,800+Monthly Rental Income Potential
3–5yrAverage ROI Payback Period

What We Build

Every ADU project is custom-designed for your lot, your goals, and King County code.

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Detached ADU (DADU)

A standalone dwelling in your backyard. Most flexible for rental or multigenerational living. Requires setback compliance and separate utility connections.

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Attached ADU

Connected to the primary home via a shared wall. Lower cost than detached, faster permitting. Ideal for in-law suites or long-term rental income.

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Junior ADU (JADU)

Converted from existing interior space — garage, basement, or bonus room. Lowest cost entry point. Limited to 500 sq ft per King County code.

The King County Permitting Process

Prolific handles every step. Most homeowners have never pulled a permit — we've done hundreds.

1

Site & Zoning Review

We verify your parcel's zoning, setbacks, lot coverage, and utility capacity before design starts. Catches 80% of project-killers on day one.

2

Design & Engineering

Architectural plans drawn to King County standards. Structural engineering included where required. Typical design phase: 3–6 weeks.

3

Permit Submission

We submit to King County DPER or the applicable city (Federal Way, Renton, Issaquah, Kent). Electronic submission with full plan set.

4

Review & Corrections

County review typically takes 6–12 weeks. We respond to all correction requests and manage the back-and-forth until permit issuance.

5

Build & Final Inspection

Construction with milestone inspections. Final inspection and certificate of occupancy required before the unit can be rented or occupied.

Cost Ranges for King County ADUs

Rough estimates — every project varies by site, size, and finish level. Free estimate available after a site visit.

ADU TypeSize RangeTypical Cost Range
Junior ADU (JADU)Up to 500 sq ft$60,000 – $120,000
Attached ADU400–800 sq ft$120,000 – $200,000
Detached ADU (DADU)400–1,200 sq ft$160,000 – $320,000

Ready to Add a Unit to Your Property?

Free site consultation. We'll tell you what's possible on your lot before you spend a dollar.

Get Your Free ADU Estimate

Prolific's Differentiator

While We're Restoring Your Home, Let's Make It Better Than Before

Most contractors patch the damage and leave. We use the restoration as a launchpad — pairing insurance coverage with a remodel that upgrades what you had.

Storm + Remodel

Federal Way — Hail Damage + Kitchen Upgrade

Insurance covered the roof and siding. While we had the crew on-site, the homeowners financed a kitchen remodel they'd been putting off for years. One mobilization, two wins.

Water + Addition

Renton — Burst Pipe + Primary Bath Expansion

A burst pipe triggered an insurance claim for the subfloor and drywall. We rebuilt the bathroom larger than it was — same timeline, carrier paid the base, owner paid the delta.

Fire + Rebuild

Issaquah — Garage Fire + ADU Conversion

Garage total loss became a permitted two-car garage with a studio ADU above. Insurance rebuilt what burned. The ADU now generates rental income to offset the mortgage.

Insurance Claim? We Handle Everything.

Your Insurance Company Has Adjusters.
Now You Have Us.

STORM DAMAGE RESPONSEthousands more for homeowners just like you.

Mastering Interior Painting: Tips from Prolific Design-Build and Restoration

A fresh coat of paint has the power to transform any interior space, breathing new life into your home or business. At Prolific Design-Build and Restoration, we understand the importance of a well-executed interior paint job and are here to make your vision a reality.

The Benefits of Professional Interior Painting:

  • When it comes to interior painting, the benefits of hiring professionals are immeasurable. Our skilled team at Prolific Design-Build and Restoration brings expertise and precision to every project, ensuring a result that surpasses your expectations.
  • Our services not only enhance the aesthetic appeal of your space but also provide long-lasting protection for your walls. Our use of high-quality paints and materials means your interior will remain vibrant and pristine for years to come.

Selecting the Right Paint Colors:

  • Choosing the perfect color palette can be a daunting task. Our experienced consultants can assist you in selecting the ideal shades that match your style and desired ambiance.
  • We believe in personalization, and we understand that every project is unique. Whether it’s creating a cozy atmosphere in your living room or a professional look in your office, our team will help you achieve the desired effect.

The Step-by-Step Process of an Interior Paint Job:

  • Our interior painting process is a carefully orchestrated symphony of skills and techniques. It begins with thorough preparation, including covering and protecting furniture and surfaces.
  • We then meticulously prepare the walls, addressing any imperfections and ensuring a smooth canvas for the paint. The application of paint is an art, and our painters are artists. We apply each coat with precision and attention to detail.

How Your Team Ensures a Flawless Finish:

  • At Prolific Design-Build and Restoration, we are committed to delivering a flawless finish. We understand that the quality of work is in the details. Our team takes the time to ensure that lines are crisp, corners are sharp, and surfaces are even.
  • We also conduct thorough inspections throughout the process to guarantee a perfect outcome. Our dedication to excellence means that your space will not only look immaculate but also feel rejuvenated.

FAQs:

We’ve compiled a list of common interior painting questions:

  • What is your process for interior painting? Our process involves thorough preparation, paint selection, meticulous application, and final inspection.
  • How long does it take to paint an interior? The timeline depends on the size and complexity of the project, but we work efficiently to complete the job promptly.
  • What are your pricing options? We offer competitive pricing, and our quotes are tailored to your specific project.
  • What are your payment terms? We provide transparent payment terms, making it easy for our clients.
  • What are your cancellation policies? Our policies ensure fairness and flexibility for our clients.

What to Expect:

When you choose Prolific Design-Build and Restoration for your interior painting project, expect:

  • Professionalism from start to finish.
  • Personalized color consultations.
  • Detailed preparation and protection of your space.
  • Meticulous painting by skilled artisans.
  • Final inspection and a space transformed to your satisfaction.

Conclusion:

In summary, Prolific Design-Build and Restoration is your trusted partner for mastering interior painting. Our commitment to professionalism, attention to detail, and dedication to delivering excellence make us the ideal choice for enhancing the beauty and value of your interior spaces. Let us transform your vision into a vibrant reality.

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Dealing with storm damage? We're here — call now or submit your info and we'll call you within the hour.

We Got Your Request

We respond within 2 business hours — same day for emergencies.

A member of our team will reach out shortly to schedule your free estimate or inspection. Here's what to have ready when we call:

What to Have Ready

  • Photos of the damage or area of concern (phone photos are fine)
  • Your insurance carrier name and claim number (if applicable)
  • Best time and number to reach you
  • A rough idea of when the damage occurred or project timeline
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Prolific Design-Build & Restoration — Federal Way, WA

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