9 min readUpdated June 2026
Knob & Tube Wiring in Massachusetts
If your Massachusetts home was built before 1950, there is a real chance it still has active knob-and-tube (K&T) wiring hidden in the walls and attic. This guide explains how to spot it, why insurance carriers care, what MA electrical code allows, and what a compliant rewire actually looks like.
What's inside
- What knob-and-tube wiring actually is (and why it was safe in 1925 but not today)
- The 6 visual signs you have K&T — even if a prior owner claimed it was removed
- Why MA homeowners insurance carriers cancel or refuse policies with active K&T
- What Massachusetts 527 CMR 12.00 / NEC 394 actually says about existing K&T
- Partial rewire vs. whole-home rewire — when each makes sense
- Realistic 2026 cost ranges for Greater Boston, South Shore, and MetroWest homes
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Read the full guide: Knob & Tube Wiring in Massachusetts: The Homeowner's Guide
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