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.

Public Adjuster vs Restoration Contractor: Which Do You Need?

When you’re dealing with significant property damage — a storm tears off your roof, a pipe floods your basement, a fire damages your kitchen — you’ll quickly encounter two types of professionals who can help with the insurance side: public adjusters and restoration contractors. Both work on your behalf, but they do very different things. Understanding which one you need (and when you might need both) can save you thousands of dollars and months of frustration.

What Is a Public Adjuster?

A public adjuster is a licensed insurance professional who represents you — the policyholder — in negotiating your insurance claim. They are not employed by your insurance company. Their job is to review your policy, document your damage, prepare an estimate, negotiate with your insurer’s adjuster, and fight for the maximum payout your policy allows.

Public adjusters are licensed by the state (in Washington, through the Office of the Insurance Commissioner) and typically charge a percentage of your claim payout — usually 10% to 15% of the total settlement. They don’t perform any repairs. They only handle the claim negotiation.

What Is a Restoration Contractor?

A restoration contractor is a licensed construction professional who physically repairs your property after damage. But a good restoration contractor does much more than swing a hammer. Insurance restoration contractors also inspect and document damage, create repair estimates (often in Xactimate, the same software adjusters use), coordinate with insurance adjusters, file supplements for missed items, and manage the entire claims process alongside the physical repair work.

Unlike a public adjuster, a restoration contractor doesn’t charge a separate fee for insurance coordination — it’s included as part of the restoration service. You pay only your deductible, and the insurance company pays the contractor directly for approved repairs.

Key Differences at a Glance

Public Adjuster: Negotiates your claim. Does not repair anything. Charges 10-15% of your payout. Licensed as an insurance professional. Advocates for higher settlement.

Restoration Contractor: Repairs your property AND coordinates the insurance claim. No separate fee for insurance work. Licensed as a contractor. Advocates for full scope of repairs to restore your home.

When You Might Need a Public Adjuster

Large, complex claims. If your home suffered catastrophic damage — a major fire, total roof failure, or extensive flooding — and you’re looking at a six-figure claim, a public adjuster’s negotiation skills can potentially increase your settlement enough to justify their 10-15% fee.

Denied or severely underpaid claims. If your insurance company has denied your claim or offered a settlement that seems far below the actual damage, a public adjuster knows policy language and negotiation tactics that can reopen or improve the claim.

No contractor involvement yet. If you haven’t hired a contractor and don’t know where to start, a public adjuster can document the damage and negotiate the claim independently. However, you’ll still need a contractor to do the actual repairs.

When a Restoration Contractor Is the Better Choice

Most standard insurance claims. For the majority of storm damage, water damage, and fire damage claims in King County, an experienced restoration contractor handles everything you need — documentation, adjuster coordination, supplement filing, AND the actual repair work — without the added cost of a public adjuster’s percentage.

You want one point of contact. A restoration contractor manages the entire process: emergency response, damage documentation, insurance coordination, repairs, and claim closure. A public adjuster only handles the claim — you still need to find, hire, and manage a contractor separately.

Speed matters. Restoration contractors can begin emergency mitigation immediately (tarping, water extraction, board-up) while simultaneously starting the claims process. A public adjuster handles paperwork only — they can’t stop your roof from leaking or your basement from growing mold.

You want to avoid the fee. A public adjuster’s 10-15% fee comes directly out of your insurance payout. On a $40,000 claim, that’s $4,000-$6,000 that could have gone toward your repairs. A restoration contractor’s insurance coordination costs you nothing extra.

Can You Use Both?

Yes — some homeowners hire both a public adjuster and a restoration contractor. The public adjuster negotiates the claim, and the contractor performs the repairs. This can make sense on very large or disputed claims where the potential settlement increase exceeds the public adjuster’s fee.

However, for most residential claims in King County, hiring both is unnecessary if your restoration contractor has strong insurance experience. An experienced restoration contractor who knows Xactimate, files supplements, and attends adjuster meetings is effectively performing the same advocacy role as a public adjuster — without the separate fee.

What About Your Insurance Company’s Adjuster?

It’s important to understand the three types of adjusters you might encounter:

Staff adjusters are employees of your insurance company. They work for the insurer, not for you. Their job is to assess damage fairly, but they’re also working within their employer’s financial interests.

Independent adjusters are hired by insurance companies on a contract basis, especially during busy storm seasons. They also work for the insurer, not for you.

Public adjusters work exclusively for you, the policyholder. They’re the only type of adjuster whose financial interest aligns with yours — they get paid more when your settlement is higher.

Your restoration contractor isn’t an adjuster at all — but the best ones understand the adjuster’s process, speak the same technical language, and know how to present documentation that results in fair, complete claim settlements.

The Bottom Line for King County Homeowners

For most residential insurance claims — storm damage, roof repairs, water damage restoration, fire damage — an experienced insurance restoration contractor gives you the best combination of advocacy, speed, and value. You get insurance expertise AND physical repairs under one roof, with no additional percentage taken from your payout.

Consider adding a public adjuster only if your claim is exceptionally large (six figures+), has been denied, or involves a complex coverage dispute that requires specialized policy negotiation.

Need help with an insurance claim? Call (425) 800-4775 for a free inspection and claims consultation. We handle the entire insurance process — documentation, adjuster coordination, supplements, and complete restoration — so you pay only your deductible. Serving all of King County, WA.

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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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