# Knob and Tube Replacement in Back Bay, Beacon Hill and South End Rowhouses > Knob and tube replacement in Back Bay, Beacon Hill and South End: unit-by-unit rewires in masonry rowhouses, district review and the over-three-story rule. URL: https://deckerbostonknobandtube.com/service-areas/back-bay-beacon-hill-south-end/ Boston Inspectional Services Department issues the electrical permit (City of Boston) Eversource electric utility 22 electrical permits describing a rewire in ZIPs 02116, 02118, 02108 and 02114, Nov 2021 to Oct 2026 02116, 02108, 02118 ZIP codes ## What usually starts a rewire in Back Bay, Beacon Hill and the South End ### A condo sale turned up old wiring A buyer's inspection of one unit finds knob and tube in a ceiling or behind a wall, and the sale now needs a plan for that unit alone. ### The unit needs a bigger panel A new kitchen or air conditioning outgrows the unit's panel, and the feed back to the meter room becomes part of the job. ### The association is replacing the meters When a building's meter bank or service entrance changes, any old wiring that shares those spaces comes up, along with design review for anything visible. ### One floor of a rowhouse is still original Units renovated at different times can leave one floor on old circuits while the rest of the building was updated long ago. ## Services in Back Bay, Beacon Hill and the South End ### 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. ### Partial Replacement → The circuits still on knob and tube replaced from the panel to the last device, with a written record of anything left for a later phase. ### Fuse Box and Panel Upgrades → Fuse boxes and full panels replaced, and 60 or 100 amp services enlarged where the load calculation calls for it, planned together with the rewire. ### Plaster Wall Rewiring → New circuits fished through plaster-and-lath houses with routes planned to keep openings few and small, and patching scoped in writing. ### Whole-House Rewiring → Every branch circuit replaced with new grounded cable, for houses where knob and tube, cloth cable and old splices are mixed through the walls. ### Rewiring During a Remodel → Knob and tube found or planned for during a kitchen, bath or attic renovation, replaced while the walls are open and sequenced with the rest of the trades. In the Back Bay, the district’s residential guidelines say no electrical or other utility equipment may be installed on a building’s primary elevations, and every connection to an individual unit has to be made inside. That rule, more than the wiring itself, is what sets knob and tube replacement apart in Boston’s rowhouse neighborhoods. [Decker Boston Knob and Tube](https://deckerbostonknobandtube.com/) arranges knob and tube replacement in Back Bay, Beacon Hill, the South End, Bay Village, St. Botolph and Charlestown, carried out by licensed and insured electrical contractors. Most jobs here are one condominium or one floor inside a masonry building, so the work starts with a [knob and tube inspection](https://deckerbostonknobandtube.com/knob-and-tube-inspection/) of that unit and the path its circuits take back to the meters. ## Old wiring inside a masonry condominium building Here the rewire is usually one home inside a building of several, and the rest of the building sets the limits. The Census shows how different the housing is. In Beacon Hill’s 02108, 75.0% of units date from before 1940, the highest share of any Boston ZIP, and only 0.6% are detached houses. In 02116, 73.7% of units are in buildings of five or more; in the South End’s 02118, 67.2%. A 2019 permit in a 1-4 family building reads “Unit #1- Rewire old knob & tube. Replace Panel,” and that is the usual shape of the job. ### Your unit and the building’s spaces Inside a unit, the job looks like any [partial replacement](https://deckerbostonknobandtube.com/partial-knob-and-tube-replacement/): trace the circuits, replace the ones still on porcelain, and record where the old system ends. Outside the unit, the meter room, risers, common halls and roof belong to the building. Where the building is a condominium, the association usually controls those spaces, so its approval and schedule come into the plan early. ### Masonry walls and plaster Where a party wall is solid masonry, there is no cavity to fish cable through, so routes follow interior partitions, closets and floor and ceiling cavities instead. That makes the [plaster wall rewiring](https://deckerbostonknobandtube.com/plaster-wall-rewiring/) approach central. When a unit renovation opens walls anyway, [rewiring during the remodel](https://deckerbostonknobandtube.com/knob-and-tube-remodel-rewiring/) avoids opening them twice. ## When cable can’t leave the floor In taller buildings, a Massachusetts code rule decides the wiring method before anything else does. ### What the rule says The Massachusetts text of the code adds a limit for taller buildings. In a building more than three stories above grade, nonmetallic cable circuits “shall not leave the floor or dwelling unit from which the circuits originate,” and they run within 15-minute thermal-barrier assemblies. Which buildings it reaches depends on their construction type, which the electrician confirms with the inspector. ### What it changes Cable can still serve the circuits inside a single-floor unit. Where the rule applies, anything that crosses floors, such as the feed from a basement meter room up to a fourth-floor unit, needs a different wiring method, and the route has to be planned around it. The [whole house rewiring](https://deckerbostonknobandtube.com/whole-house-rewiring/) page explains how routes are planned when a building’s height changes the rules. ## Meters, masts and conduit under district review Interior rewiring isn’t reviewed by the Boston Landmarks Commission. Exterior work visible from a public way usually is, and the rules differ by district. | District | Designated | What the commission reviews | | --- | --- | --- | | Back Bay Architectural District | 1966, expanded 1974, 1979 and 1981 | All proposed exterior work; service and communications equipment explicitly | | Historic Beacon Hill District | 1955, expanded several times, most recently 2024 | All exterior work visible from a public way, including views from the Common, Public Garden, Storrow Drive, the Esplanade and Longfellow Bridge | | South End Landmark District | 1983 | Front facades, visible rooftops, and side and rear walls directly facing a public way | | Bay Village Historic District | 1983 | All exterior work visible from a public way | | St. Botolph Area Architectural Conservation District | 1981 | All exterior work visible from a public way | ### The Back Bay guidelines in detail The Back Bay rules are the most specific. Wiring and equipment should be black, attachments go between the first and second story on the rear, and exposed conduit is called inappropriate for entry lighting; rear-yard conduit must be concealed, and rooftop conduit is inappropriate. Each district page says to use the commission’s decision letter to obtain the building permit, so design approval comes first. The [historic district guide](https://deckerbostonknobandtube.com/guide/rewiring-a-house-in-a-boston-historic-district/) walks through it. ### Outdoor disconnects Massachusetts limits the national code’s outdoor emergency disconnect to one- and two-family dwellings and certain new or newly divided buildings, and exempts jobs that replace only meter sockets, service conductors or main breakers. In an existing multi-unit rowhouse, a service change usually doesn’t add one to a protected wall. The inspector confirms which applies to each address. ## Sequencing a rewire around neighbors and the association The sequence follows the unit, with extra steps for the building and district. - **The first visit** starts at the unit’s panel, traces every circuit, and follows the feed back toward the meters. - **The written scope** lists new circuits, old runs to be disconnected, openings, any panel or feed change, and patching as a separate line. - **Building and district steps come next:** association approval for common spaces, and Landmarks review for anything visible outside. - **The licensed electrician pulls the Boston permit,** and the work goes area by area with planned power-off windows that keep heating controls running. - **The rough-in inspection** happens before walls close, within 72 hours of notice under state rules, weekends and holidays excluded. - **The finish** is the final inspection, a labeled panel schedule and a written summary stating that no knob and tube remains in service in the unit. Rewiring one unit in a rowhouse? Start with the unit's circuits and the path back to the meters. The building and district steps follow from that. Get an Estimate (617) 405-3599 ## From the Public Garden to the Southwest Corridor The three neighborhoods share Boston’s permit office and Eversource, but each building type puts the difficulty somewhere different. On Beacon Hill, around Louisburg Square and the State House, 02108 has the highest share of pre-1940 housing in Boston. The district’s review reaches views from the Common, the Public Garden and Storrow Drive, so even a rear service change can count as visible from a public way. In the Back Bay, from the Commonwealth Avenue Mall to Massachusetts Avenue, nearly three in four units in 02116 sit in buildings of five or more, so the electrical work is staged around neighbors above and below. In the South End, along Tremont Street and the Southwest Corridor Park, about a fifth of units in 02118 are in three- and four-unit buildings, so some jobs look more like a small multi-family than a large condominium. Winter brings its own constraints. Boston averages 91.6 days a year at or below freezing (NOAA), and where several units share one boiler, a planned power-off window can affect the whole building’s heat. The [living at home guide](https://deckerbostonknobandtube.com/guide/living-at-home-during-rewiring/) covers those days. ## Permits, fees and paying for it The [Boston Inspectional Services Department](https://www.boston.gov/permitting/permits/electrical-permit) issues the permit, and only a licensed contractor may apply. With no service change, the fee is $20 plus $1 per fixture, plug or outlet and $5 per meter; a new or upgraded service is $0.25 per amp instead. Permit records list 22 rewire permits in these ZIPs between November 2021 and October 2026, likely an undercount. The [Boston permit guide](https://deckerbostonknobandtube.com/guide/boston-electrical-permit-for-rewiring/) covers inspections. Two programs have size limits that matter here. Mass Save’s barrier incentive of up to $7,000 for moderate-income households covers 1 to 4 unit homes, so a unit in a larger building should confirm eligibility first; the [grants guide](https://deckerbostonknobandtube.com/guide/knob-and-tube-removal-grants-massachusetts/) explains it. The Boston Home Center’s repair loan, which names knob and tube removal, accepts condos in associations of six units or fewer. If a sale is driving the work, the [selling guide](https://deckerbostonknobandtube.com/guide/selling-a-house-with-knob-and-tube-massachusetts/) covers what buyers ask for. ## Bay Village, St. Botolph and Charlestown These areas share the permit office and utility, so they are covered here. ### Bay Village Bay Village became a historic district in 1983, and all exterior work visible from a public way goes to review. A meter, mast or conduit change on any wall seen from a street or alley goes through that review first. ### St. Botolph The St. Botolph Area Architectural Conservation District, designated in 1981, reviews exterior work visible from a public way. Inside, the rewire follows the Back Bay’s unit-by-unit pattern. ### Charlestown Charlestown’s 02129 is 50.3% pre-1940, with 23.8% of units in three- and four-unit buildings, and seven permits there described a rewire between November 2021 and October 2026. The Monument Square Landmark District near the Bunker Hill Monument is listed only as a study, so no local district review applies yet. The [panel upgrade page](https://deckerbostonknobandtube.com/electrical-panel-upgrade/) covers service changes on these rowhouses. ## Neighborhoods, landmarks and routes - Back Bay - Beacon Hill - South End - Bay Village - St. Botolph - Charlestown - Monument Square - City Square - Thompson Square ### Landmark districts - Back Bay Architectural District - Historic Beacon Hill District - South End Landmark District - Bay Village Historic District - St. Botolph Area Architectural Conservation District ### Landmarks - Boston Public Garden - Commonwealth Avenue Mall - Massachusetts State House - Louisburg Square - Southwest Corridor Park - Bunker Hill Monument ### Routes - Storrow Drive - Massachusetts Avenue - Tremont Street - MBTA Green Line - MBTA Orange Line (Back Bay) - Rutherford Avenue 1. 1. Back Bay, Beacon Hill & South End 2. 2. Belmont 3. 3. Brookline 4. 4. Cambridge 5. 5. Dorchester 6. 6. Jamaica Plain, Roslindale & West Roxbury 7. 7. Medford and Malden 8. 8. Newton 9. 9. Somerville Schematic, not to scale: close-together neighborhoods are spread out so each number reads. Planning a rewire in Back Bay, Beacon Hill and the South End? Start with which circuits are still live. The rest of the estimate follows from that. Get an Estimate (617) 405-3599 ## Back Bay, Beacon Hill & South End questions ### How is knob and tube replacement priced for a single Back Bay condominium? From that unit's own scope, not from a neighborhood rate. The typical Boston-area budgeting range of $8,000 to $25,000 or more is written for a whole house or one building, so a single unit is priced from its circuit count, its access through floors and ceilings, and any change to its panel or feed. A panel or service upgrade adds a typical Massachusetts range of $3,000 to $6,500. ### Can a new meter or service mast go on the front of a Back Bay building? No. The Back Bay Architectural District's residential guidelines say no electrical or other utility equipment may be installed on a building's primary elevations. Wiring is to be black, building attachments go between the first and second story on the rear, and connections to individual units are made inside the building. Any change is reviewed by the commission before the building permit. ### Why can't new cable run between floors in a tall Beacon Hill building? Because of a Massachusetts rule on nonmetallic cable. In buildings more than three stories above grade, the state code says those cable circuits must not leave the floor or dwelling unit where they originate, and must run within rated thermal-barrier assemblies. The building's construction type decides whether it applies, confirmed with the inspector. Where it does, a feed from a basement meter room needs another wiring method. ### Does the South End Landmark District review a new rear service entrance? It can. The district reviews all exterior work on front facades, on rooftops visible from a public way, and on side and rear elevations that directly face a public way. A rear wall facing a public alley or street can fall inside that. Check the address with the Landmarks Commission before the electrical permit is filed for any visible service change. ### Does a Charlestown rowhouse need Landmarks approval for exterior electrical work? Not under a designated local district, as the Landmarks Commission currently lists them. The Monument Square Landmark District appears as a study, not a designated district. A study can lead to designation, so check its status with the Commission before planning a visible meter or mast change around Monument Square. ## Related guides Learn 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. Learn How does a Boston electrical permit for rewiring work? Every knob and tube rewire in Boston runs through one permit office, one fee formula and two state rules about when walls can close. Here is the sequence from filing to final sign-off. 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. 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. ## Nearby service areas Cambridge Inspectional Services Department permits Cambridge The insulation contractor stopped work Boston Inspectional Services Department permits Dorchester The stair lights still run on the old wiring Town of Brookline inspector of wires permits Brookline A condo purchase turned up knob and tube