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.

Water Damage Restoration Kent, WA

← All Kent Insurance Restoration Services

Water Damage Restoration in Kent, Washington

24/7 Emergency Water Damage Response in Kent — Mitigation, Restoration & Insurance Claims Handled A to Z

Water damage doesn’t wait — and neither do we. Whether it’s a burst pipe at 2 AM, a storm-driven roof leak, or sewage backup flooding your Kent home, Prolific Design-Build and Restoration responds within hours to stop the damage, dry your property, and manage your entire insurance claim so you can focus on your family.

We handle both phases of water damage recovery: emergency mitigation (stopping the water and preventing mold) and complete restoration (rebuilding everything to pre-loss condition). Most companies only do one or the other. We do both — under one roof, one project manager, one insurance claim.

Common Causes of Water Damage in Kent

Kent’s Green River Valley location makes it one of King County’s most water-damage-prone cities. Valley-floor properties face rising groundwater and surface flooding during heavy rains. East Hill homes deal with water intrusion from hillside runoff and aging roof systems. The commercial and industrial properties along the Kent Valley corridor frequently experience damage from plumbing failures in aging buildings and roof membrane breaches.

Our Water Damage Restoration Process

Our Kent emergency team arrives equipped for any scale of water damage — from a single-room pipe burst to a multi-story commercial flood. We set up containment, extract water, deploy drying equipment throughout affected areas, and begin tear-out of unsalvageable materials. Our project manager coordinates with your insurance company from day one to ensure nothing falls through the cracks.

Water Damage Services We Provide in Kent

  • Emergency Water Extraction — Industrial pumps and truck-mounted extractors remove standing water fast
  • Structural Drying — Commercial dehumidifiers and air movers eliminate moisture from walls, floors, and cavities
  • Mold Prevention & Remediation — Antimicrobial treatment and containment protocols
  • Sewage & Contaminated Water Cleanup — Category 2 and 3 water handling with proper disposal
  • Flooring Removal & Replacement — Hardwood, carpet, tile, and vinyl restoration or replacement
  • Drywall & Insulation Repair — Cut-back, dry, and replace water-damaged walls and insulation
  • Cabinet & Vanity Restoration — Save what can be saved, replace what cannot
  • Complete Reconstruction — Full rebuild of water-damaged areas to pre-loss condition

Insurance Claims for Water Damage in Kent

Water damage claims are among the most disputed by insurance companies. They’ll argue about the source, the category of water, whether damage is “sudden” vs “gradual,” and whether mold pre-existed. We know every angle because we deal with adjusters every day.

  • Damage Documentation — Moisture mapping, thermal imaging, and photo documentation from day one
  • Xactimate Estimating — We write detailed line-item estimates in the software adjusters use
  • Adjuster Coordination — We meet your adjuster on-site and advocate for proper scope
  • Supplement Filing — Hidden damage behind walls, under floors, and in crawl spaces is documented and recovered
  • Direct Insurance Billing — We bill your insurance company directly so your out-of-pocket is typically just your deductible

Kent Areas We Serve

We respond to water damage emergencies throughout Kent including East Hill, West Hill, Kent Station, Meridian, Panther Lake, the Kent Valley, and surrounding areas. Our typical response time is 1-2 hours, 24 hours a day, 7 days a week.

Why Kent Homeowners Choose Prolific Design-Build and Restoration

One company handling both mitigation and restoration means no finger-pointing, no gaps in coverage, and no delays waiting for a second contractor. We manage the entire process from the emergency call through final reconstruction — including every interaction with your insurance company. As an independent contractor, our only loyalty is to you and the quality of your repair.

Call (425) 800-4775 now for emergency water damage response in Kent, or contact us online. We respond 24/7.

Related Resources

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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