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.

Insurance Restoration King County WA

Frequently Asked Questions

What types of damage does insurance restoration cover?

Insurance restoration covers storm damage (hail, wind, lightning), sudden water damage, fire damage, and vandalism. We document all damage and work with your adjuster to maximize your claim.

How do I know if my damage qualifies for an insurance claim?

Schedule a free inspection with us. We’ve worked thousands of claims and know exactly what insurers look for. Many homeowners leave money on the table because they miss hidden damage.

Do you charge to help with insurance claims?

No — working with your insurance company is part of our service at no extra charge. You only pay your deductible. We handle all documentation, adjuster meetings, and follow-ups.

Can you help if my insurance claim was denied?

Yes. We help homeowners appeal denials by providing detailed documentation, additional photos, and professional damage assessments. Many denied claims are successfully overturned with the right evidence.

How long does insurance restoration take?

From first call to completion, most projects take 3–8 weeks depending on claim approval timelines. We handle the paperwork so the process is as smooth as possible for you.

Get a Free Estimate Today

Serving all of King County. No obligation — just honest answers.

📞 (425) 800-4775Contact Us Online

King County’s Full-Service Insurance Restoration Contractor

When disaster strikes your home — whether it’s a devastating storm, unexpected water damage, or fire — the last thing you need is the stress of coordinating multiple contractors and fighting with your insurance company. Prolific Design-Build and Restoration is King County’s trusted insurance restoration contractor, handling everything from emergency response to complete restoration under one roof.

Unlike contractors who only handle roofing or only do water damage, we provide comprehensive restoration services. One contractor, one insurance claim, one point of contact from start to finish. This means faster repairs, cleaner claims, and less stress for you.

Our Insurance Restoration Services

Storm Damage Restoration

Pacific Northwest storms bring high winds, heavy rain, hail, and falling trees. We repair and replace storm-damaged roofs, siding, gutters, windows, and exteriors. Our team responds 24/7 for emergencies, providing immediate tarping and board-up followed by complete permanent restoration. Learn more about our storm damage services.

Roof Insurance Claims

Roof damage is the most common insurance claim in King County. We specialize in documenting roof damage, coordinating with adjusters, and completing repairs that meet both insurance specifications and Washington State building codes. Learn more about roof insurance claims.

Water Damage Restoration

From burst pipes to storm-driven water intrusion, water damage requires fast action to prevent mold and structural deterioration. We provide emergency water mitigation, drying, mold remediation, and complete interior and exterior restoration — all coordinated through your insurance claim.

Fire Damage Restoration

Fire damage extends far beyond the burn area. Smoke damage, water damage from firefighting, and structural compromise all need to be addressed. We handle the full scope of fire damage restoration including structural repair, smoke and soot cleaning, odor removal, and interior rebuild. Learn more about fire damage restoration.

Siding Repair & Replacement

Storm-damaged, hail-dented, or wind-torn siding compromises your home’s weatherproofing and appearance. We repair and replace all types of siding — vinyl, fiber cement, wood, and engineered — and handle the insurance claim for covered damage. Learn more about siding insurance claims.

Emergency Board-Up & Tarping

When your home is exposed to the elements, we provide immediate emergency tarping and board-up to prevent further damage. This emergency response is documented and included in your insurance claim. Learn more about emergency services.

Why Choose Prolific Design-Build and Restoration for Insurance Restoration?

One contractor handles everything. Most insurance restoration projects involve roofing, siding, painting, gutters, and interior work. Other contractors sub out half the work. We do it all in-house — which means consistent quality, faster completion, and a simpler insurance claim.

We maximize your insurance payout. Our detailed documentation and adjuster coordination ensure that all damage is captured in your claim — including hidden damage that adjusters often miss. We file supplements when needed and advocate for full coverage of all necessary repairs.

You pay only your deductible. We work within the scope approved by your insurance company. There are no surprise bills, no upselling, and no pressure. Our job is to restore your home to pre-damage condition using premium materials and expert craftsmanship.

500+ projects completed across King County. We’ve been serving Issaquah, Bellevue, Renton, Sammamish, Kirkland, Redmond, Kent, Auburn, Federal Way, Maple Valley, Covington, Enumclaw, Black Diamond, and surrounding communities for years. Our experience means faster approvals, fewer denials, and higher-quality restoration.

Our Insurance Claims Process

We make the insurance claims process simple. Free inspection, professional documentation, claim filing assistance, adjuster coordination, premium restoration, and final walkthrough — we handle every step. See our complete insurance claims process.

Protect Your Home Year-Round

Don’t wait for disaster to strike. Our Prolific Protection Plan provides annual roof and exterior inspections, pre-storm documentation, priority emergency response, and repair discounts — so you’re always prepared.

Get a Free Insurance Restoration Consultation

Call (425) 800-4775 for a free damage inspection and insurance claims consultation. We’ll assess the damage, explain your coverage options, and handle the entire restoration process from start to finish. Licensed, bonded, and insured in Washington State.

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

📋 Get a Free Estimate