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.

🏡

Detached ADU (DADU)

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

🏗

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.

🏠

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.

Roof Insurance Claims Contractor — King County, WA

Roof Insurance Claims Contractor — King County, WA

When a storm damages your roof, dealing with your insurance company shouldn’t be another headache. At Prolific Design-Build and Restoration, we specialize in helping King County homeowners navigate the roof insurance claims process from start to finish. We handle the documentation, work directly with your adjuster, and make sure you get every dollar your policy entitles you to.

How We Handle Your Roof Insurance Claim

Our team has managed hundreds of roof insurance claims across King County. We know what adjusters look for, how to document damage properly, and how to ensure nothing gets missed. Here’s our proven process:

Step 1: Free Roof Inspection & Damage Assessment

We perform a comprehensive inspection of your entire roof system — shingles, flashing, gutters, fascia, soffit, and underlayment. We use professional-grade equipment to identify damage that’s invisible from the ground, including hail impacts, lifted shingles, cracked flashing, and compromised seals around vents and skylights.

Step 2: Professional Documentation

Insurance companies deny claims when documentation is incomplete. We create a detailed damage report with high-resolution photos, measurements, and descriptions of every affected area. This report is formatted to match what insurance adjusters expect, which speeds up approval and maximizes your payout.

Step 3: Insurance Company Coordination

We file your claim with all supporting documentation, coordinate directly with your insurance adjuster, and are present during the adjuster’s on-site inspection to ensure all damage is properly identified. If your adjuster misses damage, we advocate on your behalf — respectfully but firmly.

Step 4: Repair or Replacement

Once your claim is approved, we complete the repair or full roof replacement using premium materials backed by manufacturer warranties. We work within the scope approved by your insurance company so you only pay your deductible — nothing more.

Types of Roof Damage We Handle for Insurance Claims

  • Wind damage — Lifted, torn, or missing shingles from Pacific Northwest windstorms
  • Hail damage — Dented, cracked, or bruised shingles that compromise waterproofing
  • Fallen tree and debris damage — Structural impacts from branches, limbs, and fallen trees
  • Ice dam damage — Water intrusion caused by ice buildup at roof edges
  • Rain and water damage — Leaks, rot, and interior damage from compromised roofing
  • Lightning damage — Structural and electrical damage from lightning strikes

Why King County Homeowners Choose Us for Roof Insurance Claims

We work with ALL insurance carriers. State Farm, Allstate, USAA, Farmers, Liberty Mutual, Pemco, Safeco, American Family — we’ve successfully processed claims with every major insurance company operating in Washington State.

You pay only your deductible. We work within your insurance company’s approved scope and pricing. Our job is to make sure the approved scope accurately covers all damage — not to inflate costs or cut corners.

Licensed, bonded, and insured. We carry full general liability insurance and Washington State contractor licensing (required for any roofing work in King County). This protects you and satisfies your insurance company’s requirements.

500+ projects completed. We’ve been restoring King County homes for years. Our experience means faster approvals, fewer denials, and higher claim payouts for our clients.

What If My Roof Insurance Claim Was Denied?

Claim denials happen — but they’re often overturned with proper documentation and a professional re-inspection. If your claim was denied or underpaid, contact us for a second opinion. We’ll inspect the damage, provide independent documentation, and help you file a supplement or appeal. Many homeowners who come to us after a denial end up getting their claim approved.

Serving All of King County

We provide roof insurance claims assistance throughout King County, including Issaquah, Bellevue, Renton, Sammamish, Kirkland, Redmond, Kent, Auburn, Federal Way, Maple Valley, Covington, Enumclaw, Black Diamond, and surrounding communities.

Get a Free Roof Insurance Inspection

Think your roof may have storm damage? Call (425) 800-4775 for a free inspection and claims consultation. We’ll assess the damage, explain your options, and handle the entire insurance process if you choose to move forward. There’s no cost and no obligation.

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
Back to Home

Prolific Design-Build & Restoration — Federal Way, WA

📋 Get a Free Estimate