The Complete Guide to Hiring a General Contractor in Washington State

Everything you need to know about finding, vetting, and working with licensed general contractors for additions, renovations, and major projects

Last Updated: March 2026

What Does a General Contractor Do?

A general contractor (GC) is your project quarterback. They manage:

Project coordination: Scheduling, sequencing, and overseeing all work
Subcontractor management: Hiring and supervising plumbers, electricians, HVAC, etc.
Permits and inspections: Pulling permits, scheduling city/county inspections
Material procurement: Ordering and staging materials
Quality control: Ensuring work meets code and your standards
Budget management: Tracking costs, managing change orders
Timeline management: Keeping the project on schedule

When You Need a General Contractor

Home additions (rooms, second stories, ADUs)
Whole-house renovations
Kitchen or bathroom remodels (major)
Basement finishing
Garage conversions
Structural changes (removing walls, new openings)
Any project requiring multiple trades

When You Might Not Need One

Single-trade work (just electrical, just plumbing)
Minor repairs or maintenance
Cosmetic updates (paint, flooring in one room)
Projects you're managing yourself with individual contractors

Washington State General Contractor Requirements

Washington takes contractor licensing seriously. General contractors must meet specific requirements.

Contractor Registration

All general contractors in Washington must have:

L&I Contractor Registration: Active registration with Washington State Department of Labor & Industries
Surety Bond: Minimum $12,000 for residential work ($24,000 for commercial)
General Liability Insurance: Industry standard is $1,000,000+ coverage
Workers' Compensation: Required if they have employees
UBI Number: Valid registration with Department of Revenue

Specialty Licenses for GC Projects

GCs often manage trades that require separate licensing:

Electrical: Requires separate L&I electrical license (homeowners can't DIY)
Plumbing: Requires separate L&I plumbing license
HVAC: Requires EPA Section 608 certification for refrigerant work
Structural: May require Professional Engineer (PE) stamp on plans

What Registration Means for You

When you hire a registered GC, you have:

$12,000 bond protection for incomplete or defective work
Verified insurance protecting your property
L&I complaint process if problems arise
Legal accountability for the contractor

Average General Contractor Costs in Washington

GC pricing varies widely based on project type, location, and contractor qualifications.

GC Markup & Fees

Fee Structure	Typical Range	Best For
Percentage of project	15-25%	Large, well-defined projects
Cost-plus	Cost + 10-20%	Complex, evolving projects
Fixed bid	Project-specific	Projects with clear scope
Time & materials	$75-$150/hour + materials	Small projects, repairs

Project Cost Estimates (Seattle Metro)

Project Type	Cost Range	Typical Duration
Room addition (200 sq ft)	$80,000-$150,000	2-4 months
Second story addition	$250,000-$500,000+	4-8 months
Kitchen remodel (major)	$60,000-$150,000	6-12 weeks
Bathroom remodel (major)	$30,000-$80,000	4-8 weeks
Basement finishing	$50,000-$120,000	6-10 weeks
ADU (detached)	$200,000-$400,000	6-12 months
ADU (attached/conversion)	$100,000-$250,000	3-6 months
Whole-house renovation	$200,000-$600,000+	6-12 months
Garage conversion	$40,000-$100,000	4-8 weeks

Regional Price Multipliers

Region	Multiplier	Notes
Seattle/Eastside	1.30-1.50x	Highest labor costs, complex permits
Tacoma/South Sound	1.10-1.25x	Below Seattle rates
Olympia/Thurston	1.00-1.15x	Baseline state average
Bellingham	1.10-1.25x	High demand, limited supply
Tri-Cities	0.90-1.05x	Below average
Spokane	0.85-1.00x	Lower labor costs
Rural Washington	0.80-0.95x	Lower labor, travel fees may apply

Cost Per Square Foot Benchmarks

Project Type	Cost/Sq Ft (Seattle Metro)
Basic addition	$300-$450
Mid-range addition	$450-$600
High-end addition	$600-$900+
ADU (new construction)	$350-$550
Basement finishing	$75-$150
Kitchen remodel	$200-$500+

Red Flags: Warning Signs of Problematic GCs

Immediate Disqualifiers

No L&I registration: Verify at lni.wa.gov/licensing
No physical address: PO Box only is a red flag
Cash-only demands: Legitimate contractors accept checks/cards
No written contract: Required by Washington law over $1,000
Won't pull permits: A GC's core job is managing permits
Can start tomorrow: Quality GCs are booked weeks/months out

Yellow Flags (Proceed with Caution)

No portfolio of similar projects: May be inexperienced with your project type
Large upfront deposits: Industry standard is 10-20%, not 50%+
Vague scope of work: Contract should be extremely detailed
Won't provide sub references: May have problems with trade partners
No project manager assigned: Who's your daily contact?
Lowball bid: Often means cut corners or change orders coming

Common GC Scams in Washington

The Disappearing Deposit: Contractor collects large deposit, does minimal work, then becomes unreachable. Never pay more than 10-20% upfront.

The Change Order Avalanche: Low initial bid, then endless "unforeseen" issues requiring expensive change orders. Get detailed scope and ask about contingency.

The Permit Dodge: "Permits just slow things down." Unpermitted work can't be insured, creates resale problems, and may need to be torn out.

The Bait and Switch: Senior salesperson sells the job, inexperienced crew shows up. Ask who specifically will manage your project.

The Never-Ending Project: Contractor juggles multiple jobs, yours drags on indefinitely. Get timeline commitments with penalties in the contract.

How to Verify a Washington General Contractor

Step 1: L&I License Verification

Visit lni.wa.gov/licensing and search for the contractor:

Active registration status
Current bond and insurance
No pending complaints or violations
Business name matches who you're dealing with
Check contractor type (general vs. specialty)

Step 2: Get Their UBI Number

Ask for their Washington State UBI (Unified Business Identifier). Verify at dor.wa.gov:

Business is registered and active
Business type matches expectations
They're registered to collect sales tax

Step 3: Request Insurance Certificate

Ask for a current Certificate of Insurance (COI) showing:

General liability: $1,000,000+ recommended
Workers' compensation (if employees)
Builder's risk insurance (for major projects)
Your name as "certificate holder"

Step 4: Check References Thoroughly

Ask for:

5+ references from past 12 months
Projects similar to yours in scope
At least one project that had issues (how did they handle it?)

Call references and ask:

Did the project come in on budget?
Did the project finish on time?
How did they handle unexpected issues?
How was communication throughout?
Would you hire them again?

Step 5: Visit a Current Jobsite

Ask to see a project in progress:

Is the site clean and organized?
Are workers wearing safety gear?
Is the work protected from weather?
Are permits posted visibly?
How do workers respond to questions?

Questions to Ask General Contractors

About Their Business

How long have you been a licensed GC in Washington?
What types of projects do you specialize in?
How many projects do you run simultaneously?
Will you be on-site daily, or is there a project manager?
Who are your regular subcontractors? Can I contact them?
What's your approach to communication with homeowners?

About Your Project

What's your estimated timeline for this project?
What could cause delays, and how do you handle them?
What's your process for handling change orders?
How do you handle permits and inspections?
What happens if we discover hidden issues (rot, asbestos, etc.)?
What's your warranty on workmanship?

About Costs

Is this a fixed bid, cost-plus, or time & materials?
What's included in your markup/fee?
How much contingency should I budget for unknowns?
What's your payment schedule?
How do you handle change orders and cost overruns?
Are there any potential costs not included in this bid?

About the Team

Who will be on-site daily managing the work?
Will your own employees do any work, or all subs?
How do you vet your subcontractors?
What happens if a sub does poor work?
Who do I contact if there's a problem?

Understanding GC Contracts

Essential Contract Elements

Every GC contract should include:

Scope of Work

Detailed description of all work to be performed
Materials and products specified by brand/model where relevant
What's explicitly NOT included
Quality standards and specifications

Timeline

Start date
Milestone dates for key phases
Expected completion date
Delay penalties and extensions

Payment Schedule

Total contract price
Payment milestones tied to work completion
Retainage amount (typically 5-10%)
How change orders are priced and approved

Change Order Process

How changes are requested and approved
How changes are priced
Who can authorize changes
Timeline for pricing changes

Warranties

Workmanship warranty (typically 1-2 years)
How warranty claims are handled
Manufacturer warranties passed through

Dispute Resolution

Mediation/arbitration clause
Which state's law governs
Venue for disputes

Termination Clause

Grounds for termination by either party
How payment is calculated if terminated
Who owns materials on-site

Red Flag Contract Terms

Watch out for:

Vague scope descriptions ("standard materials")
Payment schedule heavily front-loaded
Contractor can terminate for any reason
Homeowner waives right to sue
No timeline or completion date
Change orders at contractor's discretion
No warranty or warranty less than 1 year

Washington Permits for GC Projects

When Permits Are Required

Virtually all GC projects require permits:

Any structural work (walls, foundation, framing)
Electrical work (always requires permit)
Plumbing work (always requires permit)
HVAC work
Room additions
ADUs
Basement finishing
Kitchen/bath remodels involving plumbing/electrical
Roofing in many jurisdictions

Seattle Permit Process (Example)

Design/plans: Architect or designer creates plans
Plan review submission: Submit to SDCI
Plan review: 4-12 weeks depending on complexity
Permit issuance: Pay fees, receive permit
Construction: With inspections at key points
Final inspection: Certificate of Occupancy issued

Permit Costs (Seattle)

Project Type	Permit Cost (Approximate)
Room addition	$3,000-$10,000+
Kitchen remodel	$500-$2,000
Bathroom remodel	$400-$1,500
ADU	$5,000-$15,000+
Basement finishing	$1,000-$3,000

Costs vary significantly by jurisdiction and project scope.

Why Permits Matter

Insurance: Claims may be denied for unpermitted work
Safety: Inspections catch dangerous errors
Resale: Unpermitted work must be disclosed
Financing: Lenders may not lend on unpermitted additions
Legal: Unpermitted work can result in fines and required demolition

Managing Your GC Relationship

Communication Best Practices

Weekly meetings: Schedule regular check-ins
Single point of contact: Know who to call
Document everything: Email confirmations for verbal agreements
Site visits: Walk the project regularly
Photo documentation: Take progress photos

Handling Problems

When issues arise:

Raise it immediately: Don't let problems fester
Document in writing: Follow up conversations with email
Refer to contract: What does your agreement say?
Be solution-oriented: Focus on fixing, not blaming
Escalate if needed: L&I complaint, mediation, attorney

Change Orders

Change orders are inevitable. Handle them well:

Get changes in writing before work proceeds
Understand pricing: Time & materials vs. fixed price
Approve in writing with signature
Keep running total of all changes
Budget 10-20% contingency for unknowns

Payment Best Practices

Never pay more than 10-20% deposit
Tie payments to completed milestones
Withhold 5-10% retainage until final inspection
Never make final payment until you're satisfied
Pay by check or card (creates paper trail)

Washington ADU-Specific Considerations

ADUs (Accessory Dwelling Units) are booming in Washington. Special considerations:

Seattle ADU Rules

Max size: 1,000 sq ft for attached, 1,000 sq ft for detached
No owner-occupancy requirement (as of 2019)
Streamlined permitting process
Impact fees may apply

ADU Cost Factors

Site access (crane needed? Tight lot?)
Utility connections (new or extend existing?)
Foundation type (slab vs. crawlspace)
Finishes (basic vs. high-end)
Design fees (can be 8-15% of construction)

ADU Timeline (Seattle)

Phase	Typical Duration
Design	2-4 months
Permit	3-6 months
Construction (detached)	4-8 months
Construction (attached)	3-6 months
Total	9-18 months

When Projects Go Wrong

Early Warning Signs

Contractor not showing up regularly
Work stopping for days without explanation
Subcontractors complaining about payment
Materials not arriving
Quality declining
Communication breaking down

Steps to Take

Document everything: Photos, emails, timeline
Written notice: Send formal written concern
Demand meeting: Face-to-face to address issues
Formal demand letter: If problems persist
L&I complaint: File at lni.wa.gov
Attorney consultation: For significant disputes
Bond claim: Up to $12,000 protection

If Contractor Abandons Project

Document project state: Photos, video, materials inventory
Send written termination: Certified mail, keep copy
File L&I complaint: Immediately
File bond claim: Against contractor's bond
Get new bids: Document cost to complete
Consider legal action: If damages exceed bond

Finding Top-Rated General Contractors

Ready to start your project? Browse our directory of verified Washington general contractors to find licensed, insured professionals in your area.

What makes a contractor "verified" in our directory:

Active L&I registration confirmed
Insurance coverage verified
No unresolved complaints
Real customer reviews
Local presence in Washington

This guide is for informational purposes. Always verify contractor credentials independently and consult with licensed professionals for your specific situation. Requirements and costs change—verify current regulations with your local building department.