Rewiring an older home is not like swapping out a few outlets.
In a historic downtown Rock Hill home, especially one with plaster walls, tight crawlspaces, old framing, and knob-and-tube wiring, the cost can climb quickly.
Here’s the plain answer: removing knob-and-tube wiring and rewiring a historic home often costs about $12,000 to $35,000 nationally, or roughly $8 to $17 per square foot. Larger homes, difficult access, plaster repair, panel upgrades, and added circuits can push the project higher.
Why Historic Homes Cost More to Rewire
The wiring itself is only part of the job.
Older homes often have:
- Plaster and lath walls instead of drywall
- Limited attic or crawlspace access
- Old electrical panels
- Undersized service
- Two-prong outlets
- No grounding
- Add-on wiring from past owners
- Fragile trim, flooring, or wall finishes
That does not automatically mean the whole house must be torn apart. But it does mean the electrician needs a plan before cutting walls open.
Typical Cost Ranges
| Scope of Work | Possible Cost Range |
| Partial knob-and-tube replacement | $4,000–$12,000+ |
| Full-home rewire, smaller historic home | $12,000–$22,000+ |
| Full-home rewire with panel upgrade | $18,000–$35,000+ |
| Large or difficult historic-home project | $35,000+ |
These are planning ranges. A real estimate depends on access, square footage, number of circuits, panel condition, and how much wall repair is needed.
What Can Drive the Price Up?
The biggest cost drivers are usually:
- Wall access: plaster repair is slower and more expensive than drywall.
- Panel condition: many older homes need a modern breaker panel.
- Service size: the utility service may need upgrading.
- Circuit count: kitchens, laundry rooms, HVAC, and bathrooms need dedicated circuits.
- Grounding: older wiring may not provide safe grounding.
- Permits and inspections: Rock Hill handles permitting through its Building Permits & Inspections department, and the city’s online portal notes permits must be submitted online.
- Code updates: South Carolina’s residential electrical rules are based on the 2021 South Carolina Residential Code, which includes Part VIII for electrical work.
Why Knob-and-Tube Removal Matters
Knob-and-tube wiring is old wiring that uses separate hot and neutral conductors supported by ceramic knobs and tubes.
The concern is not just age.
The bigger issues are that it may have been modified, buried in insulation, overloaded by modern appliances, or connected to ungrounded outlets. That is where homeowners sometimes get into trouble.
A good electrician should check whether the wiring is still active, what it feeds, and whether previous repairs were done safely.
What a Good Estimate Should Include
A proper rewire estimate should spell out:
- Whether the project is partial or full-home
- Which circuits are being replaced
- Whether the panel is included
- Permit and inspection handling
- Outlet, switch, and fixture scope
- Grounding and GFCI/AFCI protection
- Wall access and patching responsibilities
- Timeline and power shutoff expectations
- What is excluded
The cheaper option is not always wrong, but it should make sense. A low quote that avoids permits, ignores plaster repair, or only replaces visible wiring may not solve the actual problem.
Do Not DIY This One
Replacing knob-and-tube wiring is not a safe DIY project.
You are dealing with old insulation, unknown splices, grounding issues, panel work, and code requirements. Mistakes can create shock risk, fire risk, or insurance problems later.
The Bottom Line
For a historic downtown Rock Hill home, a realistic starting budget is usually $12,000 to $35,000+ for knob-and-tube removal and rewiring.
If the home needs a panel upgrade, service upgrade, plaster repair, or major circuit additions, expect the higher end.
The goal is not to buy the biggest electrical job. The goal is to understand what wiring is active, what is unsafe, what code requires, and what should be upgraded while the walls are already being opened. A good electrician should be able to show you that clearly before you approve the work.
