Days 1–30
Assessment, scope, permit
On-site walk to identify K&T, aluminum, or other legacy wiring. Detailed scope with room-by-room sequencing. AHJ permit application; PG&E coordination if service-side work is included.
Residential Electrical Services · Pillar Guide
Rewiring the home without rebuilding the home.
Whole-house rewiring, knob-and-tube replacement, aluminum branch wiring remediation — the work that lets Marin homeowners live in older homes safely without gutting them to do it.
11 yrsMarin electrical work
C-10CSLB licensed contractor
1st passInspection rate
48 hrTypical estimate turnaround
Key Takeaways
- Knob-and-tube wiring in homes built before 1950 should be replaced — it's a documented fire hazard and most California insurance carriers now require remediation at renewal.
- Aluminum branch wiring (homes built 1965-1973) warrants either full replacement or COPALUM/AlumiConn termination remediation, depending on insurance carrier requirements.
- Whole-house rewire on a 2,000 sqft occupied Marin home runs $14,000-$26,000 and typically takes 1-3 weeks; homeowners can stay in the home during most rewires.
- Partial rewires (specific circuits, specific rooms) are appropriate when most of the home is on modern wiring but specific legacy circuits need remediation.
- Insurance documentation matters — we coordinate closed-permit, inspection report, and photo documentation directly with carriers as part of the project.
01 — OverviewWhat Home Wiring & Rewiring in Marin actually covers in Marin.
Marin's older housing stock means rewiring work is a significant portion of our residential schedule. Roughly 30% of Marin homes were built before 1950 and may have some original knob-and-tube wiring; another 15% were built during the 1965-1973 window when aluminum branch wiring was common. Both technologies have known safety issues that warrant remediation.
The good news: rewiring an occupied home is operationally manageable in 2026. Modern fishing techniques, careful crew coordination, and good drywall-patch practice mean homeowners can stay in the home during most rewires with only specific rooms unavailable on specific days. The bad news: rewiring is invasive, time-consuming, and expensive — but the alternative (continuing to operate hazardous wiring) is dramatically more expensive when something fails.
Definition
Whole-house rewiring is the systematic replacement of branch-circuit wiring throughout a home, typically including new conductors, new outlets and switches at every location, and updated panel terminations — distinct from selective remediation which addresses specific circuits or rooms.
Knob-and-tube wiring (K&T) — why remediation
K&T uses ceramic knobs and porcelain tubes to route bare or rubber-insulated conductors through framing. The rubber insulation degrades over decades and the system has no ground conductor. K&T circuits are documented fire hazards; most California insurance carriers now require remediation.
Aluminum branch wiring — why remediation
Aluminum branch wiring (distinct from aluminum service-entrance wiring, which is fine) was installed in 1965-1973 due to copper price spikes. The aluminum-to-copper terminations at outlets and switches loosen over time, causing arcing and fire risk. Remediation involves either full replacement with copper or specialized terminations (COPALUM, AlumiConn).
For the broader context this guide supports, see our Residential Electrical Services overview.
Explore the Full Guide
Rewiring scopes organized by triggering condition. Featured guides cover the most common scenarios; categorized clusters drill into specific topics.
Three guides to read first
Cornerstone
Whole-House Rewiring in Marin
The full whole-house rewire process — assessment, scope, permit, occupied-home logistics, inspection, documentation.
Explore the guide →
Most-Asked
Knob-and-Tube Replacement Guide
K&T identification, remediation scoping, insurance documentation, and the realistic process for pre-1950 Marin homes.
Explore → InsuranceAluminum Branch Wiring Remediation
Identification, COPALUM vs full replacement, insurance carrier requirements, and remediation cost.
Explore →Browse the Full Library
Process & logistics
02What rewiring actually costs in Marin.
Typical 2026 Marin pricing for the most-quoted rewiring scopes.
| Scope | Typical range | Timeline |
|---|---|---|
| Whole-house rewire, 1,500 sqft, occupied | $11,000 to $19,000 | 1-2 weeks elapsed |
| Whole-house rewire, 2,000 sqft, occupied | $14,000 to $26,000 | 2-3 weeks elapsed |
| Whole-house rewire, 3,000 sqft, occupied | $22,000 to $42,000 | 3-4 weeks elapsed |
| K&T-specific remediation (partial scope) | $4,500 to $14,000 | 1-2 weeks |
| Aluminum wire COPALUM termination only | $2,800 to $5,800 | 3-5 days |
| Single-room rewire | $1,800 to $4,500 | 2-3 days |
03Can I live in my home during a rewire?
Yes, for most rewires — and most Marin homeowners do. The work is sequenced room-by-room or floor-by-floor so the homeowner has functional space throughout. A typical 2,000 sqft rewire might affect 2-3 rooms per day during the active work phase; those rooms are unavailable during the work day and back in service by end of day. Kitchen and primary bathroom downtime is coordinated specifically — we work with homeowners to schedule those rooms for days when alternatives are available.
The dust factor is real. Cutting drywall to fish new wiring produces sheetrock dust regardless of how careful the crew is. We use plastic dust barriers, run HEPA air scrubbers in active work areas, and clean daily. Homeowners with severe dust allergies or immune compromises sometimes choose to stay elsewhere during the active rough-in phase (typically the first week of a whole-house rewire); for everyone else, staying in the home is workable.
04How an occupied-home rewire actually works.
The realistic 3-phase timeline for a 2,000 sqft occupied-home whole-house rewire.
Days 31–60
Rough-in (running new wires)
Bulk of the elapsed time — typically 6-12 working days for a 2,000 sqft home. New cable run from panel to every outlet/switch/fixture location, drywall cuts as needed to fish wire, panel terminations updated.
Days 61–90
Trim, inspection, drywall patch
New outlets and switches installed, fixtures reconnected, AHJ inspection (typically passes first time for our work), drywall patches and texture matching, paint coordination with homeowner if desired.
05Insurance carrier documentation for rewires.
For homeowners doing carrier-required remediation (K&T, aluminum), the documentation matters as much as the work itself. Here's what we provide.
Closed permit with AHJ sign-off
The closed permit from your AHJ is the definitive documentation that the work was inspected and approved. We deliver the closed-permit record at project completion.
Before/after photos at every panel and circuit
Photo documentation of original wiring (K&T, aluminum) at every accessible location, paired with after-photos of the replacement work. Formatted for carrier submission.
Detailed work summary
Written summary describing the scope completed, materials used, AHJ involvement, and any partial scope (if specific circuits weren't remediated). Carrier underwriters use this for renewal eligibility determination.
Frequently Asked Questions
How do I know if my home has knob-and-tube wiring?
Most homes built before 1950 in Marin have at least some K&T wiring, even if other circuits have been modernized. Visual identification: open the attic and look for porcelain knobs (white ceramic) mounted to joists with bare or cloth-wrapped conductors running through them. Or open the basement/crawl space and look for the same. K&T usually shows up in attics and basements where it's accessible; the visible portion indicates the wall-cavity portion exists. We can do a quick walk-through inspection for $185-$280 to give you a definitive scope assessment — much more reliable than guessing from photos.
My insurance company says I need to replace knob-and-tube — what now?
Standard situation in 2026 — most California carriers now require K&T remediation at policy renewal. Three steps: first, get a scope assessment from a C-10 contractor (we do these routinely and can have you scoped within a week). Second, schedule remediation — depending on scope, this is 1-3 weeks of work. Third, submit the closed permit, inspection report, and photo documentation to your carrier. We've worked with most major California carriers on this exact scenario; the documentation requirements are predictable and we handle them as standard project deliverables. Premiums typically stabilize or reduce after carrier confirms remediation.
Can I rewire just part of my home?
Yes, partial rewires work in specific scenarios. The most common: a home where most circuits are modern but specific legacy circuits (a kitchen still on K&T, a bathroom still on knob-and-tube) need remediation. Or: a home with K&T in attic circuits but modern wiring elsewhere — we remediate the attic. Partial rewires range $4,500-$14,000 depending on scope. The constraint is that the partial scope has to be coherent — we can't safely rewire 'half a circuit'; the work has to be drawn at logical electrical boundaries (full circuit, full room, full floor).
What's the difference between full rewire and COPALUM/AlumiConn termination?
For aluminum branch wiring (homes built 1965-1973), two remediation paths exist. Full replacement: pull out aluminum branch wiring, replace with copper. Durable, expensive, typically $14,000-$26,000 for a typical home. COPALUM or AlumiConn termination: leave the aluminum branch wiring in place but replace every aluminum-to-copper connection with a specialized terminator that compresses copper directly to aluminum. Less invasive, less expensive ($2,800-$5,800), but doesn't eliminate the aluminum wiring itself. Insurance carriers vary on which they accept — some require full replacement; others accept COPALUM termination. We confirm with your carrier before scoping the work.
How much disruption should I expect during a rewire?
Realistic expectations for a 2,000 sqft occupied-home rewire: drywall dust in active work areas, daily room-by-room shutdowns coordinated in advance, power outages of 4-8 hours on specific days when panel work is happening, drywall patches that require texture matching and paint touch-up after the rewire is complete. We use plastic dust barriers, HEPA air scrubbers, and daily cleaning to minimize impact. Most homeowners describe the experience as 'inconvenient but tolerable.' Homeowners with severe dust allergies or immune compromises sometimes stay elsewhere for the active rough-in phase (typically the first week).
Will my home insurance go down after rewiring?
Often yes, or at minimum the carrier will continue your existing policy without surcharge. Homes with active K&T or aluminum branch wiring increasingly face non-renewal or significant surcharges; remediating the wiring resolves the underwriting concern. Specific outcomes depend on your carrier and your overall risk profile, but the documented remediation routinely shifts homeowners from 'difficult to insure' to 'standard market' eligibility. We provide all the closed-permit and photo documentation formatted for carrier submission at project completion.
How We Reviewed This Page
- Reviewed against current California Electrical Code (Title 24, Part 3) and 2023 NFPA 70 (NEC) provisions applicable to the topic.
- Pricing ranges reflect actual 2026 Towery Electric quote data from Marin County jobs — not third-party industry averages.
- Permit and inspection timing reflects current AHJ practice in Novato, San Rafael, Mill Valley, and unincorporated Marin County as of mid-2026.
- Technical review by Alex Towery, founder and C-10 #989290 holder, with 11+ years of California electrical work.
- All factual claims about code requirements were verified against primary sources (CSLB, CARB, PG&E, AHJ) at time of publication.
References
This guide reflects Towery Electric's professional standards as a California-licensed C-10 electrical contractor and is for general information. Site conditions, panel configurations, code amendments, and permit-authority requirements vary; final scoping, sizing, and code compliance for your specific address are determined on a paid site assessment. We follow California Electrical Code (Title 24, Part 3) and applicable NFPA 70 (NEC) editions adopted by your AHJ.