Whole House Rewiring in Washington State

Last Updated: March 2025

Complete home rewiring is one of the most significant electrical projects a homeowner can undertake. Whether you're dealing with outdated wiring, safety hazards, or planning a major renovation, this guide covers everything Washington homeowners need to know about whole-house rewiring.

When Is Whole House Rewiring Needed?

Age-Related Indicators

• House built before 1950: Likely has knob-and-tube wiring
• House built 1965-1973: May have aluminum branch wiring
• House built before 1980: Wiring insulation may be degrading
• Any home 40+ years old: Worth professional evaluation

Warning Signs Requiring Attention

• ⚡ Frequent breaker trips or blown fuses
• ⚡ Flickering or dimming lights
• ⚡ Burning smell from outlets or switches
• ⚡ Discolored outlets or switch plates
• ⚡ Warm outlets or plugs
• ⚡ Sparking when plugging in devices
• ⚡ Two-prong outlets throughout home
• ⚡ Shock or tingling from switches/outlets

Situations Requiring Rewiring

• Knob-and-tube wiring present (insurance often requires removal)
• Aluminum wiring with issues (oxidation, overheating)
• Major renovation (often triggers code requirement)
• Insurance denial due to wiring condition
• Adding significant electrical loads (EV charger, AC, etc.)

Types of Outdated Wiring

Knob-and-Tube Wiring (Pre-1940s)

• Ceramic insulators (knobs) and tubes through framing
• No ground wire
• Often covered by blown-in insulation (fire hazard)
• Common in Seattle's older neighborhoods
• Must be replaced if covered by insulation

Aluminum Branch Wiring (1965-1973)

• Used during copper shortage
• Expands/contracts more than copper
• Connections loosen over time
• Higher fire risk at connections
• May need remediation or replacement

Cloth-Insulated Wiring (1920s-1950s)

• Rubber insulation wrapped in cloth
• Insulation becomes brittle with age
• Crumbles when disturbed
• Should be replaced

Early Plastic (NM) Wiring

• Pre-1985 versions had thinner insulation
• May not meet current ampacity standards
• Evaluate on case-by-case basis

Rewiring Costs in Washington

Average Costs by Home Size

Home Size	Seattle Metro	Spokane	Rural WA
Under 1,500 sq ft	$8,000-15,000	$6,500-12,000	$5,500-10,000
1,500-2,500 sq ft	$12,000-22,000	$10,000-18,000	$8,500-15,000
2,500-3,500 sq ft	$18,000-30,000	$15,000-25,000	$12,000-20,000
Over 3,500 sq ft	$25,000-40,000+	$20,000-32,000	$18,000-28,000

Cost Factors

Increases Cost:

• Multi-story homes (more complex routing)
• Plaster walls (harder to fish wire)
• Limited attic/crawl space access
• High-end finish work restoration
• Adding circuits beyond basic replacement
• Detached structures (garage, ADU)

Decreases Cost:

• Open walls (during renovation)
• Good attic/crawl access
• Single-story home
• Basic outlet/switch count
• Accessible panel location

Cost Breakdown

Typical whole-house rewire cost allocation:

• Labor: 50-60% ($4,000-18,000)
• Materials: 20-30% ($2,000-8,000)
• Panel/Service: 10-15% ($1,500-4,000)
• Permits/Inspection: 5-10% ($500-1,500)
• Patching/Restoration: 5-15% ($500-3,000)

What's Included in a Whole-House Rewire

Standard Scope

• Remove all existing branch circuit wiring
• Install new 200-amp panel
• New copper wiring to all outlets/switches
• Grounded three-prong outlets throughout
• GFCI outlets where required (bath, kitchen, garage)
• AFCI protection for bedrooms
• Smoke detector circuits
• Updated lighting circuits
• Proper grounding system

May Be Included

• New meter base and weatherhead
• Additional circuits for modern needs
• Ceiling fan pre-wiring
• Dedicated appliance circuits
• Outdoor outlet circuits
• Structured wiring for data

Typically Not Included

• Drywall repair and painting
• New fixtures (unless specified)
• Low-voltage wiring (data, phone)
• Landscape lighting
• Solar preparation
• EV charger circuits (often added separately)

Washington State Code Requirements

Current Code Standards

Washington adopts the National Electrical Code (NEC) with state amendments:

Required in New/Rewired Homes:

• 200-amp minimum service recommended
• Dedicated circuits for major appliances
• 20-amp kitchen small appliance circuits (minimum 2)
• Bathroom circuit(s) on GFCI
• GFCI protection in wet locations
• AFCI protection for bedrooms (and often all habitable rooms)
• Smoke detector interconnection
• Outdoor outlets on GFCI

GFCI Requirements

Ground Fault Circuit Interrupter protection required in:

• Bathrooms
• Kitchens (countertop outlets)
• Garages
• Outdoors
• Crawl spaces
• Unfinished basements
• Within 6 feet of sinks
• Laundry areas

AFCI Requirements

Arc Fault Circuit Interrupter protection required in:

• Bedrooms
• Living rooms
• Family rooms
• Dining rooms
• Hallways
• Closets
• Recreation rooms

Permit Requirements

Permits Are Mandatory

All electrical rewiring in Washington requires permits, regardless of scope.

Permit Process

1. Application: Contractor submits plans and load calculations
2. Review: Building department reviews (1-7 days)
3. Rough Inspection: After wiring, before walls closed
4. Final Inspection: After all work complete

Multiple Inspections Typical

For whole-house rewiring, expect:

• Panel/service inspection
• Rough-in inspection (wiring before drywall)
• Final inspection

DIY Restrictions

Washington permits homeowner electrical work on owner-occupied single-family homes, but:

• Permits still required
• Must pass all inspections
• Whole-house rewiring is complex and dangerous
• Professional installation strongly recommended

The Rewiring Process

Phase 1: Planning (1-2 weeks)

• Initial assessment and quote
• Circuit planning and layout
• Permit application
• Material ordering
• Scheduling coordination

Phase 2: Panel and Service (1-2 days)

• Utility coordination for power disconnect
• Install new meter base (if needed)
• Install new electrical panel
• Set up temporary power if needed

Phase 3: Rough Wiring (3-7 days)

• Install new circuits throughout home
• Run wire through attic/crawl space/walls
• Install boxes for outlets/switches
• Rough-in inspection

Phase 4: Finish Work (1-3 days)

• Install outlets, switches, covers
• Connect fixtures
• Panel labeling
• Testing all circuits
• Final inspection

Phase 5: Restoration

• Patch holes in walls/ceilings
• Paint touch-ups
• Clean up

Total Timeline

• Small home (under 1,500 sf): 5-10 days
• Medium home (1,500-2,500 sf): 7-14 days
• Large home (over 2,500 sf): 10-21 days

Add time for permit processing and utility coordination.

Minimizing Wall Damage

Techniques to Limit Damage

Professional electricians use several methods:

• Attic access: Running wire through attic space
• Crawl space routing: Using space below floor
• Fishing wire: Threading through existing wall cavities
• Strategic cut points: Minimal, well-placed access holes
• Surface conduit: Where aesthetics allow

When Walls Must Be Opened

Sometimes necessary for:

• Multi-story homes with no attic access
• Adding outlets where none existed
• Plaster walls (harder to fish)
• Fire blocking in balloon-frame homes

Coordinating with Renovations

Best time to rewire:

• During kitchen/bathroom remodel
• When replacing drywall anyway
• During major renovation projects
• Before finishing unfinished spaces

Safety Considerations

Fire Risk

Outdated wiring is a leading cause of house fires:

• Knob-and-tube with insulation contact
• Loose aluminum wire connections
• Overloaded circuits
• Degraded insulation

Electrical Shock Risk

Old wiring often lacks:

• Proper grounding
• GFCI protection
• Adequate insulation

Insurance Implications

Many insurers:

• Require removal of knob-and-tube
• Charge higher premiums for old wiring
• May deny coverage for homes with hazardous wiring
• Require electrical inspection before insuring

Washington Licensing Requirements

Legal Requirements

Whole-house rewiring must be performed by:

• Licensed Electrical Contractor (EC)
• Or Journeyman Electrician (01) employed by EC

Verify Before Hiring

Check at: WA L&I License Lookup

Required credentials:

• Active electrical contractor license
• Liability insurance
• Workers' compensation insurance
• Bond (varies by type)

Questions to Ask Contractors

About Qualifications

1. What is your Washington Electrical Contractor license number?
2. How many whole-house rewires have you completed?
3. Can you provide references for similar projects?
4. Who will perform the actual work?
5. Are your electricians state-licensed?

About the Project

1. Can you inspect my current wiring and provide assessment?
2. What is your approach to minimizing wall damage?
3. How many circuits will the rewire include?
4. What's included in your quote vs. add-ons?
5. How do you handle drywall repair?

About Process

1. How long will my power be out?
2. Can we live in the home during rewiring?
3. What's the expected timeline?
4. Do you handle all permits and inspections?
5. What warranty do you provide?

About Costs

1. Is this a fixed price or estimate?
2. What could cause the price to increase?
3. Are permits included in the price?
4. Do you offer financing?
5. What's your payment schedule?

Red Flags to Avoid

Warning Signs

• ❌ No license number provided
• ❌ Offers to skip permits "to save money"
• ❌ Unusually low bid (below market by 40%+)
• ❌ Demands large upfront payment
• ❌ Cannot provide references
• ❌ No written contract
• ❌ Pressure to decide immediately
• ❌ Cash-only requests

Financing Options

Common Payment Methods

• Home equity loan: Lower interest, uses home as collateral
• Home equity line of credit (HELOC): Flexible borrowing
• Personal loan: No collateral required
• Contractor financing: Some offer payment plans
• Credit cards: For smaller portions (high interest)

Insurance Claims

If wiring failed and caused damage, homeowners insurance may cover:

• Damage caused by electrical failure
• Sometimes includes bringing wiring to code
• Does not cover routine upgrades

Frequently Asked Questions

How long does whole-house rewiring take?

Typically 5-14 days of active work for most homes. Add 1-2 weeks for permits, utility coordination, and scheduling. During renovation with open walls: 3-7 days.

Can I live in my home during rewiring?

Usually yes, though you'll have periods without power (hours at a time, not usually days). Discuss logistics with your electrician. Kitchen and bathroom access may be limited.

Will rewiring damage my walls?

Some wall access is necessary, but skilled electricians minimize damage. Expect patching and paint touch-ups. Costs are significantly higher with plaster vs. drywall.

Does rewiring increase home value?

Yes. Modern electrical systems are expected by buyers and appraisers. More importantly, it makes your home safer, insurable, and able to handle modern electrical demands.

How do I know if my home needs rewiring?

Schedule an electrical inspection. Many electricians offer free or low-cost assessments. They'll identify wiring type, condition, and any safety issues.

What about just updating the panel?

A panel upgrade only addresses the service entrance—if wiring throughout the house is outdated or hazardous, the new panel won't fix those problems. The wiring is what runs through your walls.