# Should you buy a house with knob and tube wiring?

> Buying a house with knob and tube wiring near Boston: what a home inspection misses, three questions to answer before closing, and how to negotiate the work.

URL: https://deckerbostonknobandtube.com/guide/buying-a-house-with-knob-and-tube/

Buying a house with knob and tube can work out well if you learn the scope while you can still act on it: how much of the wiring is live, what replacing it will cost, and whether you can insure the house on the timeline a carrier gives. [Decker Boston Knob and Tube](https://deckerbostonknobandtube.com/) arranges circuit tracing and knob and tube replacement for Boston-area buyers, carried out by licensed and insured electricians.

The risk is less the wiring than the calendar. Inspection contingencies are short, insurers ask early, and some set deadlines that land in the first weeks of ownership.

Key takeaways

- A home inspection reports what it can see; only circuit tracing shows how much knob and tube is still live.
- Answer three questions before the contingency ends: how much is live, what replacement costs, and whether you can insure it in time.
- A whole-house replacement falls in a typical Boston-area budgeting range of $8,000 to $25,000 or more; a partial job can be much less.
- A credit or price reduction usually gives you more control than a seller-arranged repair.
- Rewiring before move-in is easier and faster than rewiring around a household.

## What a home inspection can and can’t tell you

A general home inspection is a visual survey of the whole house, not a test of each system. On wiring, it is good at spotting evidence and limited at measuring it.

| A home inspector can usually report | An electrician tracing circuits can add |
| --- | --- |
| Porcelain knobs and tubes in the basement or attic | Which of those runs carry power today |
| A fuse panel, and fuses that look oversized | Whether each fuse matches the wire it protects |
| Two-prong outlets and a few ungrounded three-prong ones | Which rooms are fed by knob and tube behind modern-looking outlets |
| Visible splices to newer cable | Where else old and new wiring meet out of sight |
| Insulation lying over old runs | Whether those runs are live, and what Mass Save would need certified |

The [identification guide](https://deckerbostonknobandtube.com/guide/how-to-identify-knob-and-tube-wiring/) explains what the visible evidence looks like, and the [live wiring guide](https://deckerbostonknobandtube.com/guide/how-to-tell-if-knob-and-tube-is-live/) covers how an electrician proves a run is dead.

## Three questions to answer before closing

### How much is live?

This single answer sets everything else. A house where earlier owners replaced most circuits, leaving a few attic-fed ceiling lights, is a small job. A house still running mostly on original circuits is a whole-house rewire. Ask for the findings in writing, room by room.

### What will replacement cost?

With the circuit map in hand, the work can be priced. The main drivers are the count of live circuits, stories, attic and basement access, plaster walls, the panel and the patching. Boston-area whole-house jobs fall in a typical budgeting range of $8,000 to $25,000 or more, and a fuse box or small service upgraded alongside adds a typical Massachusetts range of $3,000 to $6,500 ([panel cost guide](https://deckerbostonknobandtube.com/guide/electrical-panel-upgrade-cost-boston/)).

### Can you insure it on time?

Ask for a binding quote that names the wiring, not a general estimate. Homeowners report carriers writing a policy and then setting anywhere from about 10 days to 60 days to remove knob and tube or prove it isn’t live, while others decline outright and point owners to the state’s FAIR Plan ([insurance guide](https://deckerbostonknobandtube.com/guide/knob-and-tube-insurance-massachusetts/)).

## A sequence that fits a contingency

1. Book the home inspection as early as the contract allows.
2. If it notes knob and tube, book an electrician to trace circuits within days, not weeks.
3. Send the findings to your insurance agent and get a written answer on terms and deadlines.
4. Get the replacement priced from the circuit map.
5. Negotiate with that written scope in hand.
6. Ask your lender early whether its loan or appraisal rules have anything to say about the wiring; requirements vary by program.

## Negotiating the work

There are three common outcomes, each with a different balance of money and control.

| Outcome | How it works | Watch for |
| --- | --- | --- |
| Price reduction | The purchase price drops to reflect the work | Lowers the loan amount too; you pay for the work after closing |
| Seller credit | Money toward the work at closing | Lender limits on credits may apply; ask your lender |
| Seller repair | The seller arranges the work before closing | You don’t choose the scope or the electrician; ask for the permit, the final inspection and a completion summary |

Whatever you agree, write down what “done” means. “Knob and tube removed” should mean no knob and tube remains in service, not that the visible basement runs were swapped while the wall circuits stayed live.

## After closing: the first weeks

If the insurer has set a deadline, the clock starts at closing. A vacant house is the easiest one to rewire: no furniture to move, no residents to keep powered, and patching can finish before you unpack. Work still follows a fixed order, with the permit filed by a licensed electrician and the rough-in inspected before walls close ([how replacement works](https://deckerbostonknobandtube.com/guide/how-knob-and-tube-replacement-works/)).

### Plan insulation after the wiring

If you plan a Mass Save Home Energy Assessment, expect the wiring to come up again. Mass Save won’t insulate where knob and tube is present until a licensed electrician has dealt with it and certified the work areas. Doing the rewire first lets the insulation follow without a second interruption ([insulation barrier work](https://deckerbostonknobandtube.com/knob-and-tube-insulation-barrier/)).

### Help with the cost

Most help depends on income and timing. Mass Save offers moderate-income households up to $7,000 toward eligible removal costs and 0% HEAT Loan financing after an assessment, and Boston’s Home Center offers deferred 0% repair loans to income-eligible owner-occupants. None of the Boston Home Center programs reimburse work done before approval, so apply before signing a contract ([grants guide](https://deckerbostonknobandtube.com/guide/knob-and-tube-removal-grants-massachusetts/)).

## Which houses are manageable, and which need more thought

| Usually manageable | Worth slowing down for |
| --- | --- |
| A few circuits left on knob and tube, the rest replaced | Most circuits still original, on a small fuse panel |
| Open basement ceiling and a walkable attic | Finished basement and a floored or flat-roofed attic with no easy path |
| Old runs intact and clear of insulation | Insulation blown over live runs |
| Records of earlier permitted electrical work | Scorch marks, oversized fuses or many buried splices to newer cable |

Neither column makes the decision for you; it tells you how much the wiring is likely to cost in money and time. In a [triple-decker](https://deckerbostonknobandtube.com/triple-decker-rewiring/) or two-family house, ask the same questions unit by unit.

To get the circuits traced while your contingency is still open, call Decker Boston Knob and Tube at [(617) 405-3599](tel:+16174053599) or [ask for an estimate](https://deckerbostonknobandtube.com/contact/).

## Questions about this guide

### Can a home inspector tell how much knob and tube is still live?

Usually not. A general home inspection is visual: the inspector can report knobs and tubes in the basement or attic, a fuse panel and two-prong outlets, but can't trace circuits through closed walls or prove which runs carry power. An electrician who maps each circuit from the panel can, and that is the information a price negotiation and an insurance quote need.

### Is it better to rewire before moving in?

When the timeline allows, yes. An empty house lets the electrician reach every wall without moving furniture, power can be off for whole days without disrupting anyone, and dust and patching happen before you unpack. It also gives an insurer finished records early. The trade-off is carrying two homes or a later move-in date while the permit, inspection and patching run.

### How much should I ask the seller to credit for knob and tube?

Base the request on a written scope from an electrician who has traced the circuits, not on a rule of thumb. A whole-house job falls in a typical Boston-area budgeting range of $8,000 to $25,000 or more, but a house with a few circuits left may need far less. A priced scope also shows the seller the request is grounded.

Want this answered for your house?

Tracing the circuits shows what is still live and what the work would involve.

Get an Estimate

(617) 405-3599

## Related service

### Knob and Tube Inspection →

A licensed electrician traces every circuit, finds which old runs still carry power and puts the findings and a recommended scope in writing.

## More guides

Decision Guide

Can you sell a house with knob and tube wiring in Massachusetts?

The wiring won't stop a sale, but it will shape the buyer's inspection, their insurance quote and the price talk. Three ways to get ahead of it, and what each costs you in time.

Learn

Can you insure a house with knob and tube wiring in Massachusetts?

No Massachusetts law makes a carrier refuse old wiring, yet the question decides many closings and renewals. Here is how underwriting treats it and what paperwork moves the conversation.

Learn

How do you identify knob and tube wiring?

A field guide for owners and buyers: where to look in a Boston-area house, what each part of the system looks like, what gets mistaken for it, and where looking stops being enough.

Cost Guide

How much does knob and tube replacement cost in Boston?

The range Boston-area owners budget with, the handful of things that push a house toward either end, and the public figures sitting inside every price.

Decision Guide

Are there grants for knob and tube removal in Massachusetts?

True grants are rare. The real help runs through Mass Save's insulation programs and a few city and state loans, and the order you apply in matters as much as which one you pick.