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.

Roofing Contractor Bellevue, WA

Roofing Contractor in Bellevue, WA | Repair, Replacement & Restoration

Bellevue represents the Eastside’s largest and most diverse city. From downtown high-rises to established residential neighborhoods like Crossroads, Factoria, Somerset, and Newport Hills, Bellevue’s housing stock spans every era and style. Prolific Design-Build and Restoration brings roofing expertise across all Bellevue neighborhoods, delivering solutions perfectly suited to your home’s age, architecture, and needs.

Why Bellevue Homeowners Choose Prolific

Bellevue’s diversity is both opportunity and challenge. Older neighborhoods like Factoria and Crossroads feature 1970s-1980s construction with aging roofing systems nearing replacement. Somerset’s mid-range homes represent solid middle-class properties where roofing decisions significantly impact value and livability. Newport Hills and surrounding affluent areas feature premium homes where roofing quality affects resale value and aesthetic appeal.

Pacific Northwest climate affects all Bellevue roofs equally—heavy rainfall, wind, and moisture stress. Mixed old and new housing stock means we encounter every roofing challenge: aged asphalt shingles, outdated flashing, structural issues beneath new surfaces, and upgrades needed before resale or refinancing.

We’ve served Bellevue homeowners for years, understanding neighborhood characteristics, HOA requirements, insurance company standards, and real estate market considerations. Whether you’re protecting a primary residence, managing a rental property, or preparing for home sale, we have Bellevue-specific expertise.

Our Roofing Process

Step 1: Comprehensive Neighborhood-Aware Inspection — We assess your roof considering Bellevue neighborhood characteristics. Older homes receive special attention to underlying structural issues; newer homes are evaluated for manufacturing defects or accelerated wear.

Step 2: Clear, Detailed Estimate — You’ll receive itemized pricing, material options appropriate to your neighborhood and home value, timeline, and warranty details.

Step 3: Flexible Material Solutions — From budget-friendly options for rental properties to premium materials for high-end Bellevue homes, we source materials matching your needs and investment.

Step 4: Professional Installation — Our crews follow all local Bellevue building codes and HOA requirements. We protect your property and neighbors, managing job sites professionally.

Step 5: Documentation & Warranty — Complete documentation ensures your work is covered by warranty and properly recorded for future reference or resale.

Why Choose Prolific for Bellevue Roofing

GAF Master Elite certification represents roofing excellence. Xactimate certification ensures proper insurance documentation. Full Washington licensing and bonding protects your investment. We’ve worked across every Bellevue neighborhood and understand local permit requirements, building codes, and community standards.

Many Bellevue homeowners return to us for multiple properties or refer neighbors and friends. That loyalty reflects our commitment to excellence and customer satisfaction.

Service Areas from Bellevue

From Bellevue, we serve surrounding communities including Redmond, Sammamish, Kirkland, Issaquah, Newcastle, and the entire Eastside region. We’re ideally positioned to serve Bellevue’s geographic center.

Frequently Asked Questions

How long does roofing typically last in Bellevue?

Standard architectural shingles last 20-25 years in our climate. Premium materials and proper maintenance extend this to 25-30+ years. Metal roofing lasts 40-50 years. Your roof’s age is the primary factor—we’ll give you realistic expectations.

Does my Bellevue home’s HOA require roofing approval?

Many Bellevue neighborhoods have HOA covenants affecting roofing materials, colors, and installation timing. We’re familiar with HOA requirements and can coordinate approval processes if needed.

Will roofing work affect my Bellevue home’s resale value?

Yes, positively. A new, quality roof is one of the highest ROI home improvements. Buyers specifically seek homes with new roofs. We can provide documentation supporting your home’s value increase.

How do I know if my Bellevue roof needs replacement?

Signs include missing/curled shingles, roof leaks, granule loss, sagging, and roofs over 20+ years old. We provide honest assessment—sometimes repair is best; sometimes replacement is necessary.

Call (425) 800-4775 for a free Bellevue roofing inspection. We’ll evaluate your roof’s condition and discuss solutions protecting your home and investment. Serving all Bellevue neighborhoods and surrounding Eastside communities.

Get a Free Quote Today

Licensed • Bonded • Insured • Serving Bellevue & King County

We respond within 2 hours • (425) 200-1831

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