# How does a Boston electrical permit for rewiring work?

> How a Boston electrical permit for rewiring works: who files with Inspectional Services, the fee formula, inspection before walls close, and nearby offices.

URL: https://deckerbostonknobandtube.com/guide/boston-electrical-permit-for-rewiring/

In Boston, every knob and tube rewire needs an electrical permit from the Inspectional Services Department, and only a licensed electrical contractor can apply for it; a homeowner can’t. The fee is set by a published formula, work can’t start until the permit is issued, and the new wiring has to be inspected before any wall is closed over it. [Decker Boston Knob and Tube](https://deckerbostonknobandtube.com/) arranges permitted knob and tube replacement across Boston and nearby cities, carried out by licensed and insured electricians, with a licensed electrician pulling the permit on every job.

The same state code applies everywhere around Boston. What changes across a city line is the office that issues the permit, its fees and its scheduling.

Key takeaways

- Boston Inspectional Services issues the permit to the licensed contractor, who must be on site for the inspection.
- Fees are due upfront: $20 plus $1 per fixture, plug or outlet and $5 per approved meter when the service doesn’t change.
- A new or upgraded service is charged at $0.25 per amp up to 240 volts, plus the $20 application fee.
- Starting work before the permit is issued can mean double the permit cost or a code violation.
- Under Rule 10 of the state code, new wiring stays visible until the inspector of wires has seen it.

## Who files, and what they file

The permit is the contractor’s, by law and by city rule. That’s a protection for the owner, not a formality.

### The state rules behind it

Massachusetts law says no one may work in the business of installing wiring without a license from the state examiners of electricians (M.G.L. c. 141, § 1A). A separate law requires anyone installing wiring for hire to notify the inspector of wires on the board’s permit form, before starting or within five days of starting, with a fine of up to $500 for failing to (M.G.L. c. 143, § 3L).

### What Boston asks for

Boston’s [electrical permit page](https://www.boston.gov/permitting/permits/electrical-permit) is plain on this: homeowners can’t apply, and the licensed contractor who applies is the one who does the work. The application includes:

- a description of the project and its estimated total cost;
- a copy of the front and back of the contractor’s trade license;
- a certificate of liability insurance;
- a Massachusetts workers’ compensation affidavit.

## What the permit costs

Boston’s fee follows the scope, not the price of the job. Fees are paid upfront when the permit is issued.

| What the job includes | Boston ISD fee |
| --- | --- |
| Rewire with no change in service | $20 application fee, plus $1 per fixture, plug or outlet and $5 per approved meter |
| New or upgraded service, up to 240 volts | $20 application fee, plus $0.25 per amp |
| Other cases | $10 per $1,000 of estimated cost |
| Work started before the permit is issued | Can mean double the permit cost, or a code violation |

### Two examples

These are illustrative only. A rewire touching 30 fixtures, plugs and outlets on one meter works out to $20 + $30 + $5 = $55. A three-family house with three meters adds $15 in meter charges alone. A 200 amp service upgrade at 240 volts is $20 + $50 = $70. Ask ISD how a job that includes both a rewire and a service change is charged. The [cost guide](https://deckerbostonknobandtube.com/guide/knob-and-tube-replacement-cost-boston/) puts the permit in context: it is a small fraction of the price.

## From filing to final: the sequence

The permit fixes the order of the job. Each step below has a rule or a reason behind it.

1. **Circuit map and scope.** The circuits are traced and the work is written up, because the application needs a project description and cost.
2. **Permit issued.** No work starts until it is.
3. **Rough-in.** New cable and boxes go in, area by area, with the walls still open.
4. **Rough-in inspection.** The inspector of wires sees the new wiring before it’s covered.
5. **Connection and testing.** New circuits are connected and tested, and the old runs are disconnected.
6. **Final inspection.** Booked once the work is finished, with the licensed contractor on site.
7. **Closing the walls and the record.** Patching proceeds after inspection, and you keep the closed permit with a labeled panel schedule.

The [replacement process guide](https://deckerbostonknobandtube.com/guide/how-knob-and-tube-replacement-works/) covers what happens physically at each step.

## Inspection before walls close

Two state rules shape the inspections more than anything else, and both affect when plaster work can begin.

### Rule 10: no covering until inspected

Rule 10 of 527 CMR 12.00 says installations can’t be concealed or covered until the inspector of wires has inspected them, within 72 hours of proper notice for interior work, Saturdays, Sundays and holidays excluded. In practice, an opening cut on Thursday and called in that day may not be closable until the following week.

### Scheduling the inspection in Boston

Boston ISD schedules inspections by phone at 617-635-5300 or through its online portal, and says the inspector will be in touch within 48 hours. The licensed contractor has to be there.

### Testing leads to approval

The inspector judges the installation, but the electrician’s own testing comes first: every outlet and light confirmed on the new circuits, every old run confirmed dead. Under the state law, the inspector then gives written approval or disapproval within five days of the installer’s completion notice. That approval is the document an insurer or buyer will want later.

> Plan plaster work around inspections
>
> A good schedule shows where each rough-in inspection falls and leaves a day or two of slack. Patching that’s booked before the inspection passes is patching that may need redoing.

## Permits for related work

A rewire can touch more than one permit or office. These are the usual additions.

| Related work | What it adds |
| --- | --- |
| Opening non-structural walls | Boston’s guidance lists a short-form permit, which homeowners and contractors can both obtain |
| Service upgrade | A utility work request with Eversource; its contractor guidance asks that the wiring inspector call in the approval |
| Exterior meter, mast or conduit in a historic district | A design decision from the district commission before the building permit ([historic district guide](https://deckerbostonknobandtube.com/guide/rewiring-a-house-in-a-boston-historic-district/)) |
| Larger openings in a pre-1978 house | Lead-safe renovation rules under 454 CMR 22.00, separate from the electrical permit |

The [panel upgrade service](https://deckerbostonknobandtube.com/electrical-panel-upgrade/) covers the utility side in more detail.

## How long a permit stays open

Under Rule 8 of the state code, the permit is issued to the person or firm on the application, who notifies the inspector when the work is complete. A permit can be treated as abandoned if work hasn’t started or progressed within 12 months. A job staged over many months, such as a [triple-decker](https://deckerbostonknobandtube.com/triple-decker-rewiring/) done one floor at a time, should keep that in mind when stages are planned.

## Nearby cities run their own wire offices

Outside Boston, the permit goes to each city’s or town’s inspector of wires under the same state code. Their processes differ in ways that matter to a schedule.

| City or town | What’s known about its process |
| --- | --- |
| [Cambridge](https://deckerbostonknobandtube.com/service-areas/cambridge/) | Inspectional Services, home of the city’s Electrical/Wiring Division at 831 Massachusetts Avenue, issues electrical permits online. Work started before the permit carries a tripled fee |
| [Somerville](https://deckerbostonknobandtube.com/service-areas/somerville/) | Permits go through the city’s CitizenServe portal, and Somerville says a licensed electrician must apply for all electrical permits |
| [Medford](https://deckerbostonknobandtube.com/service-areas/medford-malden/) | All permits are filed online, contractors must register their licenses with the city, and inspections are arranged directly with inspectors during set office hours |
| [Brookline](https://deckerbostonknobandtube.com/service-areas/brookline/) and [Newton](https://deckerbostonknobandtube.com/service-areas/newton/) | Permit and fee rules are confirmed per address and project |

Licensing is the same everywhere: the state requires a licensed electrician for wiring done for hire. The [legal guide](https://deckerbostonknobandtube.com/guide/is-knob-and-tube-legal-in-massachusetts/) covers the code itself.

If you’d like a rewire planned with the permit, inspections and plaster schedule worked out together, 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

### How can I check whether a Boston electrical permit was pulled for past work?

The City of Boston publishes approved building permits, electrical permits included, as open data on Analyze Boston, searchable by address. The dataset may not show every recent permit, so for current work ask your contractor for the permit number, and for older work you can also ask Inspectional Services. A missing record is a question to raise, not proof the work was unpermitted.

### Do I need a separate permit to open plaster walls for a rewire in Boston?

Possibly. Boston's guidance on service upgrades lists a short-form permit for opening non-structural walls alongside the electrical permit, and says homeowners and contractors can both apply for the short form. Whether a given rewire needs one depends on the openings, so ask the contractor to confirm which permits the scope requires.

### What happens if the electrical inspection fails?

The inspector lists what needs correcting, the work is fixed, and a further inspection is arranged. Walls stay open in the meantime, because Massachusetts rules don't allow new wiring to be covered until it has been inspected. A schedule with some slack around each inspection keeps a correction from pushing plaster work into the following week.

Want this answered for your house?

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## More guides

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.

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How is knob and tube wiring replaced?

A rewire runs in an order the code partly sets. Each stage depends on the one before it, and knowing the order explains most of the schedule and the price.

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Is knob and tube wiring legal in Massachusetts?

Existing knob and tube can stay, new work can't make it worse, and only licensed electricians can touch it for hire. A plain reading of the state rules that apply.

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What changes when you rewire a historic home in Boston?

District commissions care about what the street can see, so most of a rewire never reaches them. The parts that do are the meter, the mast and the conduit, and inside, the plaster and trim are yours to protect.

Decision Guide

How do you compare knob and tube rewiring quotes?

Two rewiring quotes for the same Boston-area house can be thousands apart and both be honest, because they describe different jobs. Lining them up on the same points shows which job each one is.