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.

How to File a Roof Insurance Claim in Washington State

Your roof took a hit during the last storm. Maybe you can see missing shingles from the ground, or maybe your neighbor’s tree left a branch-shaped dent in your ridge cap. Either way, you need repairs — and your homeowners insurance should cover it.

But filing a roof insurance claim in Washington State isn’t as simple as calling your insurer and waiting for a check. The process has specific steps, timelines, and documentation requirements that can make or break your payout. Get it right, and your insurance covers the full cost of repair or replacement minus your deductible. Get it wrong, and you could end up with a denied claim or a lowball estimate that doesn’t cover the work.

Here’s exactly how to file a roof insurance claim in Washington — step by step — based on hundreds of claims we’ve managed across King County.

Step 1: Inspect the Damage (But Don’t Get on the Roof)

After a storm, do a visual inspection from the ground. Look for missing or lifted shingles, damaged flashing, dented gutters, granules collecting in downspouts, and any visible holes or debris. If you can safely check your attic, look for daylight coming through the roof deck, water stains on rafters, or wet insulation.

Do not climb on a damaged roof. It’s dangerous, and you don’t need to — that’s what professional inspectors are for. Take photos from the ground and from windows. Document the date and time of the storm that caused the damage.

Step 2: Call a Professional Roofing Contractor First

Before you call your insurance company, get a professional roof inspection. This is the single most important step most homeowners skip — and it costs them thousands.

An experienced insurance restoration contractor knows how to identify all storm damage, including damage that’s invisible from the ground: bruised shingles, cracked underlayment, compromised nail seals, damaged pipe boots, and lifted flashing. A contractor who specializes in insurance work will document the damage in a format that aligns with what adjusters expect, using measurements and terminology that translate directly to accurate estimates.

At Prolific Design-Build and Restoration, we provide free roof inspections for storm damage. We climb the roof, photograph every area of damage, measure affected sections, and create a comprehensive report. This report becomes the foundation of your insurance claim.

Step 3: File the Claim with Your Insurance Company

Contact your insurance company to report the damage. In Washington State, there’s no specific statute requiring you to report within a certain number of days, but most policies require “prompt” or “timely” notification. In practice, you should file within 30 days of the storm if possible, and you generally have up to one year.

When you call, have this information ready: the date of the storm, a description of the damage, your contractor’s inspection report (if available), and photos. Your insurer will assign a claim number and schedule an adjuster visit.

Step 4: The Adjuster Visit — This Is Where It Matters Most

Your insurance company will send an adjuster to inspect your roof. This visit determines how much your insurer will pay, so preparation is critical.

Have your contractor present. This is not optional if you want a fair claim. Your contractor walks the roof with the adjuster, points out every area of documented damage, and ensures the adjuster’s scope matches the actual damage. Adjusters are professionals, but they’re also evaluating dozens of claims — having your contractor there keeps everyone aligned.

During the inspection, the adjuster creates a damage assessment and an estimate (usually in Xactimate, the industry-standard estimating software). This estimate becomes the basis for your claim payment.

Step 5: Review the Insurance Estimate

After the adjuster visit, your insurer sends a written estimate. Review it carefully and compare it to your contractor’s assessment. Common things that get missed or underestimated:

Underlayment replacement — If shingles are damaged, the underlayment beneath them often needs replacement too. Some adjusters only scope shingle replacement.

Code upgrades — Washington State building codes may require upgrades when re-roofing (ventilation, ice and water shield, drip edge). If your policy includes “code upgrade coverage” or “ordinance and law” coverage, these costs should be included.

Flashing and pipe boots — Metal flashing around chimneys, skylights, and pipes often sustains hidden damage that’s easy to overlook.

Interior damage — Water that entered through the damaged roof may have stained or damaged ceilings, walls, insulation, and attic structures. These should be part of the same claim.

Step 6: File a Supplement If Needed

If the adjuster’s estimate falls short, don’t just accept it. Your contractor can file a supplement — a formal request for additional coverage with supporting documentation. Supplements are common and expected in the insurance industry. They’re not adversarial; they’re part of the process.

We file supplements regularly at Prolific Design-Build and Restoration. The most common supplement items are code-required upgrades, hidden damage discovered during tear-off, matching requirements (when partial replacement would leave mismatched sections), and overhead and profit for multi-trade projects.

Step 7: Authorize the Work and Get Your Roof Repaired

Once the claim is approved (including any supplements), your contractor begins the work. In Washington State, your insurance company typically issues payment in two phases: an initial payment when the claim is approved, and a completion payment (or depreciation holdback) after the work is finished and the contractor submits documentation proving the repairs are complete.

Your out-of-pocket cost is your deductible — that’s it. The insurance company pays the contractor directly for all approved work above your deductible.

Washington State-Specific Rules You Should Know

Right to choose your own contractor. Washington law gives you the right to hire any licensed contractor for your insurance repair. Your insurance company cannot require you to use their “preferred” vendor, though they may suggest one.

One-year filing window. Most policies allow one year from the date of damage to file a claim. However, the sooner you file, the better — waiting allows secondary damage to develop and can complicate the claims process.

Recoverable depreciation. Most Washington homeowners have “replacement cost value” (RCV) policies. The insurer initially pays the depreciated value, then pays the remaining depreciation after repairs are completed. Make sure your contractor submits completion documentation to recover this amount.

Common Mistakes That Reduce Your Roof Claim Payout

Filing without a professional inspection. Ground-level photos and a phone call to your insurer aren’t enough. You need a contractor on the roof documenting every deficiency before the adjuster arrives.

Not being present (or having your contractor present) for the adjuster visit. If no one advocates for the full scope of damage during the adjuster visit, the initial estimate will be conservative.

Accepting a denied claim without appeal. Many denied claims are overturned with additional documentation. If your claim is denied, don’t give up — get a second opinion from an experienced restoration contractor.

Waiting too long to start repairs. Delays allow secondary damage (leaks, mold, rot) to worsen. Start repairs promptly after claim approval to prevent complications.

Need Help Filing a Roof Insurance Claim?

Prolific Design-Build and Restoration specializes in roof insurance claims across King County. We provide free inspections, handle all documentation, attend adjuster meetings, file supplements, and complete the repairs — all coordinated so you don’t have to manage the process yourself.

Call (425) 800-4775 for a free roof inspection and insurance claim consultation. We’ll assess the damage, walk you through your coverage, and handle the claim 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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