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.

Get a Free ADU Estimate (425) 800-4775
$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.

Tell Us What Happened — We'll Show You What's Possible
Insurance Claim? We Handle Everything.

Your Insurance Company Has Adjusters.
Now You Have Us.

STORM DAMAGE RESPONSEthousands more for homeowners just like you.

GET YOUR FREE CLAIM REVIEW → 📞 (425) 800-4775

Licensed & Insured · PROLISN776L6 · Serving All of King County

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Prolific Design-Build and Restoration logo - insurance restoration contractor King County WA
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Design & Remodeling Covington WA

Restoration Covington WA

Covington General Contractor & Restoration Services

Covington has grown rapidly over the past two decades, transforming from a rural community into a thriving city with modern subdivisions, local shops, and excellent schools. Many Covington homes were built during the 1990s and 2000s building boom, and that generation of construction is now reaching the age where kitchens feel dated, bathrooms need updating, and deferred maintenance can lead to water damage or mold issues. Prolific Design-Build and Restoration helps Covington homeowners stay ahead of these challenges.

Our team works throughout Covington — from the neighborhoods around Covington Square and Jenkins Creek to the residential areas along Kent-Kangley Road and the SE 272nd corridor. We combine emergency restoration capabilities with skilled remodeling services, so whether you need urgent water damage repair or want to finally upgrade that builder-grade kitchen, we are the one call that covers it all.

Our Services in Covington

  • Water Damage Restoration & Emergency Response
  • Fire & Smoke Damage Repair
  • Mold Remediation & Ventilation Improvement
  • Kitchen Remodeling & Modern Upgrades
  • Bathroom Renovation
  • Home Additions & Room Conversions
  • Insurance Restoration Claims
  • General Contracting

Covington homeowners — upgrade your home with Prolific. Call (425) 800-4775 or get your free estimate.

Roofing & Restoration Services in Covington, WA | Expert Contractor

Expert Roofing & Restoration Services in Covington, Washington

We’re a trusted roofing and restoration contractor serving Covington and the surrounding rural communities. Covington’s exposure to storms, its mix of residential properties, and its developing growth make it an important part of our service area. We understand Covington homeowners’ needs—honest contractors, quality workmanship, fair pricing, and reliable service. That’s exactly what we provide. Whether you need emergency storm damage response, a roof replacement, exterior repairs, or complete restoration after a weather event, we’re here to help.

Covington’s semi-rural character and weather exposure create specific challenges for property owners. Homes here face the same severe storms as other King County communities, but sometimes struggle to find local contractors who can respond quickly and handle complex insurance claims. We’re local, we respond rapidly, and we’re experienced in managing every aspect of storm damage recovery. We coordinate with insurance companies, manage contractors, and keep property owners informed throughout the process.

Services Available in Covington:

  • Roofing: Storm damage repair, roof replacement, and professional installation
  • Insurance Restoration: Complete damage assessment, insurance documentation, and restoration
  • Exterior Painting: Residential property painting with weather-resistant products
  • Siding Repair & Installation: All types of exterior cladding services
  • Concrete Services: Driveways, patios, and foundation work
  • Drywall Services: Installation, repair, and water damage restoration
  • Pressure Washing: Property cleaning and maintenance

Why Covington Property Owners Choose Prolific Design-Build and Restoration

We understand the Covington community and value the relationships we’ve built here. When you call us, you reach professionals who understand your area’s specific challenges and weather patterns. We’re committed to fair pricing, quality work, and customer service that exceeds expectations. We’re a local business serving local families—that matters to us and to the Covington community we’re proud to serve.

Covington residents and property owners: Call or text (425) 800-4775 for professional roofing and restoration services. We’re here to help with everything from emergency damage to planned improvements. Request your free estimate online or call anytime.

Commitment to Excellence

At Prolific Design-Build and Restoration, our background in the industry, combined with our mission-driven approach, sets us apart. Our team of dedicated professionals brings extensive experience and a passion for excellence to every project. We prioritize client satisfaction and believe in transparent, collaborative relationships.

Free Estimate

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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.

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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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