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.

Does Homeowners Insurance Cover Storm Damage? A King County Guide

If a Pacific Northwest storm just ripped through your neighborhood and you’re staring at a damaged roof, torn siding, or a flooded basement, the first question on your mind is probably: will my insurance pay for this?

The short answer for most King County homeowners is yes — standard homeowners insurance policies cover sudden storm damage. But there are important details, deadlines, and exceptions you need to know to make sure your claim gets approved and you receive the full payout you’re entitled to.

We’ve handled hundreds of storm damage insurance claims across King County. Here’s what we’ve learned about how coverage actually works — and how to protect yourself.

What Storm Damage Does Homeowners Insurance Typically Cover?

Most standard homeowners insurance policies (HO-3 policies) cover damage caused by sudden, accidental events — which includes most types of storm damage. Here’s what’s typically covered:

Wind damage — Missing shingles, torn siding, damaged gutters, broken windows, and structural damage from high winds are covered under virtually all standard policies. The Pacific Northwest regularly sees windstorms with gusts exceeding 60 mph, making this the most common storm claim in King County.

Hail damage — Dented siding, cracked shingles, damaged flashing, and dented gutters from hailstorms are covered. Hail damage can be subtle — small dents and granule loss on shingles often go unnoticed but significantly reduce your roof’s lifespan.

Fallen trees and debris — If a tree falls on your home during a storm, your homeowners policy covers the structural damage to your house and the cost of removing the tree. This applies even if the tree was from a neighbor’s yard.

Lightning strikes — Structural damage, fire damage, and electrical damage caused by lightning are covered. Lightning can cause hidden damage to wiring, appliances, and electronics throughout your home.

Water damage from storm intrusion — If wind or hail damages your roof or siding and water enters your home as a result, that interior water damage is covered. This includes damaged drywall, insulation, flooring, and personal property.

What Storm Damage Is NOT Covered?

Understanding what your policy excludes is just as important as knowing what it covers:

Flooding — Standard homeowners insurance does not cover flood damage. If rising water (from rivers, heavy rain pooling, or storm surge) enters your home through the ground level, that requires a separate flood insurance policy through the National Flood Insurance Program (NFIP) or a private flood insurer.

Gradual damage and deferred maintenance — If your roof was already in poor condition before the storm, your insurer may deny the claim or reduce the payout. Insurance covers sudden damage, not wear and tear. This is why regular maintenance and pre-storm documentation are so valuable.

Cosmetic-only damage — Some policies include a “cosmetic damage exclusion” that won’t cover dents or marks that affect appearance but not function. Check your policy language carefully.

How to File a Storm Damage Insurance Claim in King County

Step 1: Document Everything Immediately

As soon as it’s safe, take photos and video of all visible damage — roof, siding, gutters, windows, interior water damage, fallen trees, and debris. The more documentation you have from day one, the stronger your claim. Don’t clean up or make permanent repairs before documenting.

Step 2: Prevent Further Damage

Your policy requires you to take reasonable steps to prevent additional damage. This means tarping a damaged roof, boarding up broken windows, and extracting standing water. Keep all receipts — these emergency mitigation costs are covered by your policy.

Step 3: Contact Your Insurance Company

Report the claim as soon as possible. Most Washington State policies require “prompt” notice, and waiting too long can give your insurer grounds to deny the claim. You generally have one year from the date of the storm to file, but sooner is always better.

Step 4: Get a Professional Inspection

Before your insurance adjuster visits, have an experienced storm damage contractor inspect your property. A professional knows where to look for hidden damage that homeowners — and sometimes adjusters — miss. At Prolific Design-Build and Restoration, we provide free storm damage inspections and document everything in a format insurance adjusters recognize.

Step 5: Meet the Adjuster On-Site

Your insurance company will send an adjuster to assess the damage. Having your contractor present during this meeting is critical. We walk the property with the adjuster, point out all documented damage, and ensure nothing is overlooked. This step alone often increases claim payouts significantly.

Step 6: Review the Estimate and Negotiate if Needed

The adjuster’s initial estimate isn’t always final. If damage was missed or the estimate seems low, your contractor can file a supplement — additional documentation requesting coverage for items the adjuster didn’t include. We handle supplement filings regularly and know how to present them effectively.

Common Mistakes That Cost King County Homeowners Money

Waiting too long to inspect. Secondary damage like mold, rot, and structural deterioration can develop within weeks. If your insurer determines that secondary damage resulted from delayed action, they may not cover it.

Not documenting hidden damage. Storm damage extends beyond what’s visible from the ground. Lifted shingles, compromised underlayment, damaged flashing, and moisture intrusion inside walls all need professional inspection.

Accepting the first estimate without question. Insurance adjusters are thorough, but they’re also working within their company’s interests. Getting your own professional assessment ensures the claim reflects the true scope of damage.

Hiring a contractor who doesn’t understand insurance. A contractor unfamiliar with insurance processes may underbid the work, leave money on the table, or create documentation that doesn’t align with what adjusters need. Choose a contractor experienced in insurance restoration.

Understanding Your Deductible

Your deductible is the amount you pay out of pocket before insurance kicks in. Most King County homeowners have a standard deductible of $1,000 to $2,500 for storm damage claims. However, some policies have a separate wind/hail deductible that’s calculated as a percentage of your home’s insured value (typically 1-2%). Check your declarations page to know your exact deductible before filing.

Important: Your deductible is the only out-of-pocket cost for a properly filed claim. Your insurance company pays the contractor directly for all approved repairs above your deductible.

Why King County Homeowners Trust Prolific Design-Build and Restoration

We’re not just a contractor — we’re an insurance restoration specialist. We handle the entire process from emergency response to final repair, and we work directly with your insurance company at every step. We document damage using industry-standard methods, file supplements when the initial estimate falls short, and coordinate with your adjuster so you don’t have to.

With 500+ completed insurance restoration projects across King County, we know exactly how to maximize your claim and restore your home to pre-damage condition. You pay only your deductible — we handle everything else.

Storm damage? Call (425) 800-4775 for a free inspection. We’ll assess the damage, explain your coverage, and handle the insurance process from start to finish. Serving Issaquah, Bellevue, Renton, Sammamish, Kirkland, Redmond, Kent, Auburn, Federal Way, Maple Valley, and all of King County.

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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 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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