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.

Storm Damage Repair & Restoration — King County, WA

Storm Damage Repair & Restoration — King County, WA

When severe weather strikes King County, Prolific Design-Build and Restoration is here with fast, professional storm damage repair services. From emergency tarping and board-up to complete exterior restoration, we handle every aspect of storm damage recovery — and we work directly with your insurance company so you can focus on your family, not paperwork.

24/7 Emergency Storm Damage Response

Pacific Northwest storms don’t wait for business hours, and neither do we. When a tree crashes through your roof at 2 AM or high winds rip off your siding during a weekend storm, call us immediately. We provide emergency tarping, board-up, and water mitigation to prevent further damage to your home — and this emergency response is fully documented for your insurance claim.

Complete Storm Damage Services

Roof Storm Damage

Wind, hail, and fallen debris cause the most common storm damage to King County homes. We repair and replace storm-damaged roofs including missing or torn shingles, damaged flashing, compromised underlayment, broken ridge caps, and structural damage from fallen trees. Every repair meets Washington State building codes and manufacturer specifications.

Siding Storm Damage

High winds, hail, and flying debris can crack, dent, or tear vinyl, fiber cement, and wood siding. We repair and replace damaged siding panels, matching your existing style and color whenever possible. If your entire siding system needs replacement, we handle the full installation with premium materials.

Water Damage from Storms

Storm damage often leads to water intrusion — through a damaged roof, compromised siding, broken windows, or overwhelmed drainage systems. We address the source of the water intrusion, dry and remediate affected areas, and restore damaged interiors including drywall, insulation, flooring, and paint.

Gutter & Drainage Damage

Heavy storms can tear gutters from fascia boards, crush downspouts, and overwhelm drainage systems. We repair and replace gutter systems to protect your home from future water damage and ensure proper drainage away from your foundation.

Exterior Painting & Finishing

After structural repairs are complete, we restore your home’s appearance with professional exterior painting and finishing. Insurance claims typically cover the cost of matching paint and finishes to pre-damage conditions, and we ensure the finished result looks like the damage never happened.

Our Insurance Claims Process for Storm Damage

We’ve handled hundreds of storm damage insurance claims in King County. Our process is designed to maximize your claim payout while minimizing your stress:

  1. Free emergency inspection — We assess all damage and secure your home against further damage
  2. Detailed documentation — Professional photos, measurements, and damage reports formatted for insurance adjusters
  3. Claim filing assistance — We help you file your claim with complete, accurate documentation
  4. Adjuster coordination — We meet with your adjuster on-site to ensure all damage is identified
  5. Professional restoration — Premium materials, expert craftsmanship, manufacturer warranties
  6. Final walkthrough — We inspect every repair with you to ensure complete satisfaction

King County Storm Damage: What You Should Know

The Pacific Northwest experiences frequent severe weather events including windstorms, heavy rain, ice storms, and occasional hail. King County homeowners should be aware that most standard homeowners insurance policies cover sudden storm damage to roofs, siding, gutters, and interiors. However, your insurance company requires proper documentation and timely filing — which is exactly what we provide.

Important: You typically have one year from the date of a storm to file an insurance claim. However, the sooner you act, the better. Waiting allows secondary damage (mold, rot, structural deterioration) to develop, which may not be covered by your policy.

Areas We Serve

We provide storm damage repair throughout King County including Issaquah, Bellevue, Sammamish, Renton, Kirkland, Redmond, Kent, Auburn, Federal Way, Maple Valley, Covington, Enumclaw, Black Diamond, SeaTac, Tukwila, and all surrounding communities.

Storm Damage? Call Now for a Free Inspection

Don’t wait for the damage to get worse. Call (425) 800-4775 for immediate storm damage assessment and emergency repair. We’ll secure your home, document the damage, and guide you through the entire insurance claims process — at no cost to you beyond your deductible.

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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