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.

Black-Owned and Latino-Owned Contractors in King County: Why It Matters and How to Find the Right One in 2026

Choosing a contractor is one of the most consequential decisions a homeowner ever makes. In King County, where the average kitchen remodel runs into six figures and a single restoration claim can mean tens of thousands in repairs, the company you hire shapes your home, your finances, and your peace of mind for years afterward. More homeowners on the Eastside, in Seattle, and across the Puget Sound are now asking a question that wasn’t always part of the conversation: does the ownership of my contractor matter? The short answer is yes — and not just for the reasons you might expect.

This guide is written for King County homeowners who are weighing their options in 2026. It covers why Black-owned and Latino-owned contractors are an important part of the local construction landscape, how to verify ownership, what questions to ask any contractor before signing a contract, and how Prolific Design-Build and Restoration — a Black-owned and Latino-owned firm based in Issaquah — fits into that picture. Whether you are remodeling a kitchen in Bellevue, restoring a home after a windstorm in Sammamish, or building an ADU in Renton, the framework below will help you make a confident, informed choice.

The State of Diversity in Pacific Northwest Construction

The construction industry in Washington has historically been one of the least diverse trades in the state. According to the Washington State Office of Minority and Women’s Business Enterprises, minority-owned construction firms still represent a small fraction of total licensed general contractors, even as the population of King County continues to diversify. That gap matters for a few reasons. It shapes who gets hired on major public projects, it influences how subcontracting dollars flow through the local economy, and it affects whether homeowners from every background see themselves represented in the people working on their property.

King County itself is now one of the most diverse counties in the Pacific Northwest, with growing populations across South Seattle, Renton, Kent, Federal Way, and the Sammamish Plateau. Homeowners in those communities increasingly want contractors who reflect their neighborhoods — not as a checkbox, but because shared experience often translates into better communication, more cultural awareness in design choices, and stronger trust on a long-term project.

Why Choosing a Black-Owned or Latino-Owned Contractor Matters

There is no single reason homeowners choose a minority-owned contractor — usually, it is a combination of practical and values-driven factors. Here are the ones that come up most often in conversations with our clients across the Eastside.

Local economic impact. Every dollar spent with a minority-owned business in King County tends to recirculate within the local economy at a higher rate. Smaller, owner-operated firms employ local crews, source from regional suppliers, and reinvest profits in the same communities where the work takes place. For a homeowner who cares where their remodel money ends up, that impact is real.

Accountability and accessibility. Minority-owned contractors are often owner-led. That means when you call about a leaking shower or a delayed delivery, you are usually talking to a decision-maker, not navigating a corporate phone tree. Richard Maldonado, the owner of Prolific Design-Build and Restoration, answers his own phone at (425) 800-4775. That kind of access is increasingly rare in a market dominated by national franchises and insurance-preferred vendor networks.

Cultural fluency in design. Design is personal. Multigenerational households, faith-centered home layouts, kitchens designed for cooking traditions that involve heavy frying or pressure cooking, and interior color palettes outside the all-white-and-grey norm all benefit from a contractor who has lived those experiences. A homeowner planning a multigenerational remodel in Renton or a primary suite that accommodates aging parents in Kirkland often finds that a minority-owned firm asks better questions earlier in the process.

Equity in the construction supply chain. Many homeowners are not aware that hiring a minority-owned prime contractor often pulls more diverse subcontractors and suppliers into the project. That ripple effect strengthens the regional construction ecosystem and helps ensure that the next generation of skilled tradespeople in King County reflects the communities being built around them.

How to Verify a Black-Owned or Latino-Owned Contractor in Washington

Verification protects everyone. A contractor claiming a minority-owned designation should be able to point to documentation, not just words on a website. Here is how to confirm.

Washington OMWBE certification. The Washington State Office of Minority and Women’s Business Enterprises maintains a public directory of certified Minority Business Enterprises (MBE), Women’s Business Enterprises (WBE), and combined MWBE firms. The directory is free to search at omwbe.wa.gov and lists each firm’s NAICS codes, certification dates, and contact information. Certification requires a formal review of ownership, control, and financial structure, so a listed firm has been independently vetted.

King County and City of Seattle programs. King County operates a separate Small Contractor and Supplier (SCS) program, and the City of Seattle has its own WMBE roster. A contractor active on public projects often appears in multiple registries.

Federal designations. Some minority-owned firms also hold federal certifications such as Small Business Administration 8(a), Disadvantaged Business Enterprise (DBE), or Minority Business Development Agency (MBDA) status. These designations are common for contractors that work on federally funded infrastructure but are less common for residential firms.

Washington L&I license verification. Independent of ownership, every legitimate Washington contractor must hold an active license through the Department of Labor and Industries. Look up any contractor at lni.wa.gov to confirm an active license, an active bond, and current liability and worker’s compensation insurance. If a contractor cannot provide their L&I number on request, that is a red flag regardless of any other claim.

Questions Every Homeowner Should Ask — Regardless of Ownership

Ownership matters, but it is never a substitute for due diligence. Whether you are interviewing a Black-owned firm in Issaquah, a Latino-owned firm in Kent, or any other contractor in King County, ask these questions before you sign anything.

Are you licensed, bonded, and insured in Washington? Get the L&I number, the bond amount, and a copy of the certificate of insurance with your name listed as a certificate holder. Confirm the insurance is current and includes general liability and worker’s compensation.

Who will be on my project day to day? Find out whether the work is performed by in-house employees or subcontractors. Both models can produce excellent results, but you need to know who is responsible for quality control, who carries the warranty, and who shows up if something goes wrong six months later.

Can I see three completed projects similar to mine? Photos are a starting point, but better firms will share addresses (with client permission) so you can drive by, or arrange a phone call with a previous client. For our work, we point homeowners to nearby completed projects across Issaquah, Sammamish, Bellevue, and Renton.

How do you handle change orders? Every meaningful renovation involves changes. The right answer is a written change order process with clear pricing, signed by both parties, before any new work begins. Verbal agreements about extra work are the source of most contractor disputes.

What is your payment schedule? Washington law caps contractor down payments. Be cautious of any firm asking for a large lump sum up front. A reasonable schedule ties payments to completed milestones, with a final retention payment after punch-list items are finished.

How do you handle insurance restoration claims? If your project is wholly or partially funded by an insurance claim, ask whether the contractor writes Xactimate-compatible estimates, files supplements, and works directly with adjusters. Restoration is a different discipline than remodeling, and not every general contractor is equipped to handle the paperwork. We cover this in detail in our guide to choosing your own contractor on an insurance claim.

Finding Minority-Owned Contractors Across King County

The Eastside, South King County, and Seattle each have growing rosters of minority-owned firms. A few practical sources to start with.

The Tabor 100 is a Seattle-based association of African American business leaders that maintains an active member directory across multiple industries, including construction. The Latino Business Alliance and the Hispanic Chamber of Commerce of Washington State both publish member directories. Chambers of commerce in individual cities — Issaquah, Sammamish, Bellevue, Renton, Kirkland, Redmond — also tag minority-owned members. NextDoor and local Facebook groups can surface community-recommended firms, though every recommendation should still be verified through L&I and OMWBE.

Public agency rosters are another reliable source. Sound Transit, King County Metro, and the City of Seattle Department of Transportation all maintain minority and women-owned vendor lists tied to active projects. While most of these firms work on commercial and public infrastructure, many also accept residential work directly.

Where Prolific Design-Build and Restoration Fits In

Prolific Design-Build and Restoration is a Black-owned and Latino-owned licensed general contractor based in Issaquah, Washington, serving homeowners across King County since our founding. Owner Richard Maldonado built the firm to do something the regional market needed: combine high-quality residential design and remodeling with full-service insurance restoration under one roof. That model — design-build paired with restoration — is unusual in the Pacific Northwest, and it is what allows our team to take a homeowner from a storm-damaged roof all the way to a fully renovated kitchen, with one contract and one point of contact.

Our ownership matters because it shapes how we run projects. We are owner-operated, which means decisions are made on-site, not in a corporate office in another state. We invest in our crews, in continuing education, and in equipment that lets us do work in-house rather than handing it to the lowest-bidding subcontractor. We are accountable to the homeowners we serve and to the King County communities we live in.

If you are comparing options on the Eastside, our guide on design-build versus traditional contractor walks through how the two models differ. For homeowners working through a claim, our explainer on choosing your own contractor for an insurance claim covers your rights under Washington law.

Services We Provide Across King County

Prolific Design-Build and Restoration offers a full range of residential design-build and restoration services across the Eastside and greater Seattle. Our design-build work includes kitchen remodels, bathroom renovations, ADU and DADU construction, whole-home renovations, deck building, siding, window replacement, flooring, open floor plan conversions, garage conversions, and aging-in-place modifications. On the restoration side, we handle storm and wind damage, water damage, fire and smoke damage, mold remediation, roof repair, emergency tarping, insurance claim coordination, and crawl space moisture remediation.

For homeowners weighing a remodel after damage, our piece on turning a restoration project into a dream home shows how the design-build-plus-restoration model can convert an insurance claim into a whole-home upgrade without changing contractors mid-project.

Areas We Serve

We serve homeowners across King County, with concentrated work in Issaquah, Sammamish, Bellevue, Renton, Redmond, Kirkland, Newcastle, Mercer Island, Kent, Tukwila, Burien, Federal Way, Maple Valley, Snoqualmie, North Bend, and Seattle. If you are unsure whether your address is in our service area, call (425) 800-4775 and our team will confirm.

What Spring 2026 Looks Like for King County Homeowners

Spring is the busiest season for residential construction in the Pacific Northwest. Roof inspections after winter storms, exterior painting, deck builds, ADU permitting, and full kitchen and bath remodels all peak between April and June. That demand also draws out-of-area contractors who arrive with door-to-door pitches, especially after wind events. Homeowners who take the time to verify licensing, ownership, and references before signing avoid most of the bad outcomes that show up in regional consumer-protection complaints each year.

If your spring project list includes inspections or seasonal maintenance, our spring home inspection checklist walks through every system to look at this time of year.

Ready to Talk About Your Project?

If you are planning a remodel, working through an insurance claim, or simply want a second opinion from a licensed local contractor, Prolific Design-Build and Restoration is here to help. We are a Black-owned and Latino-owned licensed general contractor based in Issaquah, serving homeowners across King County with design-build and full-service restoration under one roof. Call (425) 800-4775 to talk with Richard directly, or visit our contact page to request an in-home consultation. Most consultations are scheduled within a week, and there is never a charge to walk your project and provide an honest assessment.

Related Reading

Related: How to Choose the Best Restoration Company in King County WA · Design-Build vs. Traditional Contractor: Which Is Right for Your Renovation? · Can I Choose My Own Contractor for an Insurance Claim?

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What to Have Ready

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Prolific Design-Build & Restoration — Federal Way, WA

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