Full or partial rewiring?
Rewiring doesn't always mean the whole house. Many projects target the oldest circuits — bedrooms still on original ungrounded cable, a kitchen that needs more capacity, or an addition wired by a previous owner. A whole-house rewire makes sense when problems are widespread or you're already opening walls for a renovation.
Modern rewiring adds grounding for three-prong outlets, AFCI protection for living areas, GFCI protection where water is present, and enough circuits so you're not running everything off one or two lines. It's often paired with a panel replacement for a complete update.
What the work typically involves
Survey the house
Identify wiring types, problem circuits and access routes through attic and crawl space.
Plan in phases
Rewire room by room so the home stays livable, with power restored each day where possible.
Install new circuits
Run new cable, install boxes and devices, and connect to properly rated breakers.
Patch, test, inspect
Minimize and patch access openings, test every circuit and pass the required inspection.
Common reasons homeowners call
- Buying a home with original mid-century wiring
- Insurer concerns about knob-and-tube wiring
- Constant tripping on overloaded shared circuits
- Planning a major renovation
- Wanting grounded outlets throughout the house
Signs it is time to call an electrician
- Two-prong outlets throughout
- Lights dim or flicker in several rooms
- Burning smells with no obvious source
- Outlets and switches that are warm or discolored
- Cloth-covered or crumbling insulation in the attic or basement
Safety considerations
Leave old wiring undisturbed. Old wiring can become brittle and expose conductors, especially where it's been disturbed. Avoid moving or pulling on old cable in attics and crawl spaces, and don't bury knob-and-tube wiring in insulation.
What an electrician will check
- Wiring types and condition by circuit
- Insulation damage and splices in attic/crawl space
- Grounding availability
- Panel capacity for added circuits
- Code requirements for bedrooms, kitchens and baths
Related electrical problems
Local pages for this service
Related residential services
Electrical Wiring
New circuits, repairs to damaged wiring and wiring updates for kitchens, additions and major appliances.
Electrical Panel Replacement
Replacing outdated, damaged or problem-brand breaker panels and fuse boxes with a new, properly sized panel.
Electrical Inspection
Whole-home electrical safety inspections for older homes, home purchases, renovations and insurance questions.
Attic Electrical Wiring
Repairing and running wiring through attics — rodent damage, attic fans, junction box corrections and new circuits.
Frequently asked questions
It depends on size, access and how much is being rewired. Partial projects may take a day or two; whole-house rewiring commonly takes several days to a couple of weeks.
Usually. Work is typically phased so most of the home has power at the end of each day.
Knob-and-tube isn't automatically unsafe, but it's often decades old, ungrounded, and may have been modified or buried in insulation. Many insurers and inspectors recommend replacing it.
Electricians minimize openings by working from attics, crawl spaces and existing boxes. Some small access holes are usually needed.