House Rewiring & Knob-and-Tube Replacement in Bozeman, MT
Old knob-and-tube, ungrounded two-prong outlets, aluminum branch wiring or a remodel that opens the walls. Bozeman Electricians is a free quote-referral service, not an electrician. Describe the house once, and independent electricians licensed in Montana who serve Bozeman, MT and the Gallatin Valley can reply with quotes.
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Signs an older home may need rewiring
- Porcelain knobs and tubes in the attic or basement, or cloth-covered wire at fixtures.
- Mostly two-prong outlets, or three-prong outlets with no ground behind them.
- Fuses, or a small panel with circuits shared across many rooms.
- Lights that flicker, outlets that go dead, or breakers that trip with small loads.
- Scorched, brittle or crumbling insulation where fixtures or switches have been changed.
- An insurer, lender or home inspector asking about the wiring.
None of these alone means a full rewire. An inspection shows what is still in use and what can stay.
Knob-and-tube wiring in older Bozeman homes
Knob-and-tube is an early wiring method: single wires run on porcelain knobs and through porcelain tubes, with no ground. Where it still carries power, it was not designed for modern loads, and attic insulation packed around it or later splices can be a concern. No local data shows how many homes still have it, so the only way to know about a particular house is an inspection.
The City of Bozeman says it has ten National Historic Districts and 47 individually listed properties. The first, the South Willson Historic District (1978), is now part of the Bon Ton Historic District. Cooper Park, Lindley Place, South Tracy Avenue and North Tracy Avenue are also on the National Register list. ACS 2020–24 5-year estimates count about 2,993 Bozeman housing units built before 1950, and Livingston's housing is older still, with about 45.7% built before 1950. More background: knob-and-tube wiring in Bozeman.
Aluminum branch wiring from the 1960s and 1970s
The CPSC says homes built before 1965 are unlikely to have aluminum branch circuit wiring, while cables installed between 1965 and the mid-1970s, in new homes, additions and rewired circuits, may contain it. It also says homes built before 1972 and wired with aluminum are 55 times more likely to have one or more connections at outlets reach "Fire Hazard Conditions" than homes wired with copper. CPSC-recognized repairs are copper replacement, COPALUM crimp connectors and AlumiConn connectors. About 16.2% of Bozeman housing units were built in the 1960s and 1970s (ACS 2020–24 5-year), so it is worth asking about in homes from that era.
Insurance questions to ask first
Some insurers ask about knob-and-tube, older panel brands such as Federal Pacific and Zinsco, or aluminum branch wiring. Ask your agent what they need: an inspection letter, a partial rewire, a panel replacement or a full rewire. That answer often decides the scope.
What a rewire typically involves
Inspection
The electrician finds what is still live, tests circuits and checks the panel and service size.
Scope and written quote
Full or partial rewire, panel or service upgrade, number of openings, and who patches plaster or drywall.
Permit
The contractor pulls the city permit in Bozeman, Belgrade or Manhattan, or a state permit elsewhere.
Rough-in and inspection
New cable is fished in. State permits require a rough-in inspection, with 48 hours' notice before covering the work.
Final
Devices go in, old circuits are disconnected, and the final inspection closes the permit. Keep the paperwork for your insurer.
What rewiring costs
Older homes with plaster walls, finished basements or tight attics cost more to fish. A panel or service upgrade often rides along. See the Bozeman electrician cost guide for more jobs.
| Job | Typical range | Source |
|---|---|---|
| Whole-house rewiring | about $6–$10 per sq ft | 2026 cost guides |
| Panel upgrade, 100 to 200 A | $1,300–$4,500 | HomeGuide · Fixr |
| Panel replacement, same amperage | $518–$2,193 (avg ≈ $1,347) · $1,400–$2,800 | Angi · HomeGuide |
| Electrician hourly rate | $50–$130 per hour | HomeGuide, 2026 |
| Montana state electrical permit (outside Bozeman, Belgrade, Manhattan) | $45 one added circuit · $70 for 2–3 · $120 remodel with panel/service change | Montana DLI form, Rev. 11/25 |
Published national cost-guide estimates (2025–2026), not quotes. Quotes come from independent contractors, not this site.
Montana rules in plain terms
Montana requires electricians and electrical contractors to be licensed by the State Electrical Board (MCA Title 37, ch. 68). Look up any contractor or electrician by name or license number in the Montana DLI license lookup, and ask to see the license; electricians must carry it on the job. The board requires workers' comp and UI coverage (or an exemption), not a set liability amount, so ask for a certificate of liability insurance.
Bozeman, Belgrade and Manhattan issue electrical permits inside city limits; everywhere else in the valley, including Livingston, Three Forks, Big Sky and Four Corners, permits come from the Montana Department of Labor & Industry (DLI Building Codes). NorthWestern won't energize new or changed wiring without a permit. Montana adopted the 2023 NEC statewide effective September 26, 2026; certified cities enforce their adopted codes.
Montana's homeowner exemption (MCA 37-68-103(3)) covers your own property maintained for your own use, done personally, with a permit and inspection; not rentals, tenants or grid-tied generators. Rewiring a rental unit is contractor work. Renters: report problems to the landlord in writing; landlords must use licensed contractors for rental work. Not legal advice.
Questions to ask before you hire
Get two or three written quotes, and ask each contractor:
- Your business name and Montana license number? (Check it in the DLI lookup.)
- Can you send a certificate of liability insurance?
- Will the quote be written and itemized: parts, labor, permit?
- Is there a trip or diagnostic fee, and does it come off the repair?
- What is your after-hours or weekend rate?
- Who pulls the permit, and is it a city or state permit?
- Is any NorthWestern service work needed, and are its charges in your quote?
- How many wall and ceiling openings do you expect, and is patching included?
- Will any old wiring stay in service, and where?
Do not pay in full before the final inspection. See how to look up a Montana electrician license.
Related pages
Frequently asked questions
Is knob-and-tube wiring safe?
It depends on its condition and what has been done to it. Original knob-and-tube has no ground wire, and old insulation can become brittle, especially where it has been buried in insulation, spliced or overloaded. A licensed electrician can inspect what is still in use and say whether to repair, replace parts of it or rewire.
Can I get homeowners insurance with knob-and-tube wiring?
Some insurers ask about knob-and-tube, older panels or aluminum branch wiring before they quote or renew a policy. Policies differ, so ask your agent what they need: an electrician's inspection letter, a partial rewire, or full replacement. Get that answer before you buy an older home if you can.
Do they have to tear out all the walls to rewire a house?
Usually not. Electricians often fish new cable through walls and ceilings from the attic and basement, cutting small access holes that get patched later. Plaster walls in older homes take more care. Ask each contractor how many openings they expect and whether patching is in the quote or left to you.
How do I know if my home has aluminum wiring?
The CPSC says homes built before 1965 are unlikely to have aluminum branch circuit wiring, but cables installed between 1965 and the mid-1970s may contain it. Labels on exposed cable in the basement or attic may say aluminum or AL. An electrician can confirm it. CPSC-recognized repairs include copper replacement, COPALUM crimps and AlumiConn connectors.
Does living in a Bozeman historic district change rewiring?
Interior rewiring usually follows the normal permit process. The city's Neighborhood Conservation Overlay District adds review for exterior changes, so work that changes the outside, such as moving a meter or mast, may need review. Ask the contractor and the City of Bozeman before you plan exterior changes.
Describe the house once
Say the year the home was built if you know it, what you have seen (knob-and-tube, fuses, two-prong outlets, aluminum labels), whether walls are plaster or drywall, any insurer request, and whether you own or rent.
Bozeman Electricians is a free quote-referral service, not an electrician or electrical contractor. Independent contractors serving Bozeman, MT reply on their own schedules, and the one you choose quotes and does the work directly with you. Companies may pay to receive requests or calls. Prefer to talk? Call (406) 643-1006
Calls go through a call-routing provider to an independent electrical contractor. Ask for the business name and license number.
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Describe it once and independent licensed electricians serving Bozeman and the Gallatin Valley can reply with no-obligation quotes.