# What changes when you rewire a historic home in Boston? > Rewiring a historic home in Boston: what Landmarks Commission districts review, Back Bay's service rules, nearby commissions, and how to protect old plaster. URL: https://deckerbostonknobandtube.com/guide/rewiring-a-house-in-a-boston-historic-district/ Rewiring a historic home in Boston works like any other knob and tube replacement inside the walls; what changes is the exterior equipment and how carefully the interior finishes are treated. Boston’s local historic districts review exterior work, particularly what can be seen from a public way, so a new meter, service mast or exposed conduit may need a commission decision before the building permit, while new cable fished through the walls doesn’t. [Decker Boston Knob and Tube](https://deckerbostonknobandtube.com/) arranges [plaster wall rewiring](https://deckerbostonknobandtube.com/plaster-wall-rewiring/) and knob and tube replacement in historic houses across Boston and nearby cities, carried out by licensed and insured electricians. Many of these houses are also among the oldest housing in the area. In Beacon Hill’s 02108 ZIP code, 75.0% of housing units were built before 1940, the highest share of any Boston ZIP code, according to the U.S. Census Bureau. Key takeaways - Boston Landmarks Commission districts review exterior work; their pages don’t describe review of interior wiring. - A visible meter, mast or conduit can need the district’s decision letter before the building permit is issued. - Back Bay’s residential guidelines set specific rules for service equipment: no primary elevations, black finish, rear attachments, unit connections inside. - Cambridge and Somerville have their own commissions with their own scopes; Brookline and Newton rules are confirmed per address. - Inside, the work is about route planning that keeps openings small in original plaster and trim. ## What Boston’s districts review The Boston Landmarks Commission oversees a set of local districts, each with an architectural or landmark commission and its own review scope. The common thread is the exterior. | District | Designated | What is reviewed | | --- | --- | --- | | Back Bay Architectural District | 1966, later expanded | All proposed exterior work | | 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 the Longfellow Bridge | | South End Landmark District | 1983 | Front facades, plus rooftops and side or rear elevations visible from or directly facing a public way | | Bay Village Historic District | 1983 | Exterior work | | St. Botolph Area Architectural Conservation District | 1981 | Exterior work | | Aberdeen Architectural Conservation District, Brighton | 2002 | All exterior work visible from a public way | | Mission Hill Triangle Architectural Conservation District | 1985 | Front, side and visible rooftop work; rear elevations excepted | | Highland Park Architectural Conservation District, Roxbury | 2022 | See the district’s own page for its review scope | The commission also lists the Bay State Road/Back Bay West and Fort Point Channel districts, and a Monument Square district in Charlestown under study. Each district page says the commission’s decision letter is needed to obtain your building permit. ### What that means for a rewire Cable fished between floors, new boxes and a new panel in the basement are interior work. A new service entrance, a relocated meter, a mast on a roofline or conduit run up a visible wall is exterior work, and in these districts it goes to the commission first. Build that step into the schedule, and settle the service location with the commission before the utility request goes in. ## Back Bay’s rules for service equipment Back Bay goes furthest. Its residential guidelines treat all communications and service equipment as subject to commission review and spell out where it may go. ### The guidelines in plain terms - No electrical, telephone, cable or other utility equipment on the primary elevations of any building. - All wiring and equipment should be black. - Building attachments go between the first and second story on the rear elevation. - All connections to individual units are made inside the building. - Exposed conduit is inappropriate for entry lighting, conduit for rear-yard lighting is concealed, and exterior conduit on rooftops is inappropriate. ### What it changes For a service upgrade, the rear elevation is the starting assumption, and a design that feeds each unit from inside rather than with exterior runs fits the guidelines. The [panel upgrade guide](https://deckerbostonknobandtube.com/guide/does-a-panel-upgrade-remove-knob-and-tube/) covers when a service change is part of a rewire at all. ## Cambridge, Somerville, Brookline and Newton Nearby cities have their own commissions. Their scopes are similar in spirit and different in detail. ### Cambridge The Cambridge Historical Commission oversees two historic districts, Old Cambridge and Fort Washington, and four neighborhood conservation districts: Avon Hill, Half Crown-Marsh, Harvard Square and Mid Cambridge. The conservation district commissions review alterations visible from a public way; interior alterations and work not visible from any public way are exempt. Exempt and in-kind work gets a Certificate of Non-Applicability, which staff usually issue on the spot, and the commission says one of its certificates is always needed to obtain a building permit in a district or on a landmark. See the [Cambridge page](https://deckerbostonknobandtube.com/service-areas/cambridge/). ### Somerville Somerville’s Historic Preservation Commission reviews alterations or repairs in a Local Historic District that are visible from a public way and would make an irreversible change to the design, materials or outward appearance. Routine maintenance in kind isn’t reviewed. The city publishes a list of district properties by address, and applications go through CitizenServe, the same portal as electrical permits. See the [Somerville page](https://deckerbostonknobandtube.com/service-areas/somerville/). ### Brookline and Newton Historic review rules in both are confirmed per address and project before any exterior electrical work is planned. See the [Brookline](https://deckerbostonknobandtube.com/service-areas/brookline/) and [Newton](https://deckerbostonknobandtube.com/service-areas/newton/) pages. ## Inside: protecting historic plaster and trim Indoors there’s no commission, but there is the house. Original plaster, cornices, picture rails, ceiling medallions and painted woodwork are what a careless rewire damages and a careful one avoids. ### Route planning first The Massachusetts code allows cable to be fished between access points for concealed work in finished buildings, which is what makes a plaster-preserving rewire possible. Routes come down from the attic, up from the basement, and through closets and chases that stack between floors. Openings go where they’ll be hidden or easiest to restore: behind future box locations, at top plates, inside closets. The [replacement process guide](https://deckerbostonknobandtube.com/guide/how-knob-and-tube-replacement-works/) shows where those openings fall in the sequence. ### Decorative ceilings Ceilings plastered over wood strapping can sometimes be crossed without opening them, since the state code treats cable run diagonally behind strapping of about three-quarters of an inch as supported if it isn’t pulled taut. A fixture box under a medallion can sometimes be reached from the attic or the floor above, leaving the decorative plaster untouched. ### Lead paint on old finishes Painted plaster and trim in a house built before 1978 fall under the state’s lead-safe renovation rules. Disturbing more than six square feet of painted surface in a room, without testing, makes the job renovation work for a licensed lead-safe renovation contractor. Small, planned openings help on both counts. The [asbestos and lead paint guide](https://deckerbostonknobandtube.com/guide/asbestos-and-lead-paint-during-rewiring/) covers the rule in full. ## Taller rowhouses and apartment buildings Many houses in the historic core are taller masonry buildings with several units. In 02108 and 02116, about 74% of housing units are in buildings of five or more units, according to the U.S. Census Bureau. That matters because, in buildings over three stories, the Massachusetts code limits cable circuits to the floor or dwelling unit where they start. The wiring method in a five-story rowhouse may differ from the one in a two-story house, and the scope should say which is used where. The [Back Bay, Beacon Hill and South End page](https://deckerbostonknobandtube.com/service-areas/back-bay-beacon-hill-south-end/) covers those buildings. ## What it does to the budget Historic finishes are one of the drivers that move a house within the typical Boston-area budgeting range of $8,000 to $25,000 or more for a whole-house replacement: slower, smaller openings and more careful restoration take more time. Commission review adds a step to the schedule. The [cost guide](https://deckerbostonknobandtube.com/guide/knob-and-tube-replacement-cost-boston/) covers the other drivers, and the [quote comparison guide](https://deckerbostonknobandtube.com/guide/comparing-knob-and-tube-rewiring-quotes/) shows how to check that restoration is written into the scope. To plan a rewire around a historic house’s finishes and its district’s rules, 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 ### Does a Beacon Hill or Back Bay commission review interior rewiring? The Landmarks Commission's district pages describe review of exterior work, such as what is visible from a public way or, in Back Bay, all proposed exterior work. None describes reviewing wiring inside the walls. A rewire that stays indoors goes straight to the electrical permit; one that adds a meter, mast or conduit outside may need the commission's decision first. ### Is my house in a Boston historic district? The Boston Landmarks Commission lists its local districts, from Back Bay and Historic Beacon Hill to the South End, Bay Village, St. Botolph, Aberdeen in Brighton, Highland Park in Roxbury and the Mission Hill Triangle. Each has its own page and boundaries. Check the address against the district page before planning any visible exterior electrical work. ### Can a service upgrade on a historic rowhouse go on the front? In the Back Bay Architectural District, no: the residential guidelines say no electrical or other utility equipment goes on a primary elevation, and building attachments belong between the first and second story on the rear. Other districts review visible exterior work case by case. Plan the service location with the district's rules before the utility request goes in. 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 ### 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. ## More guides 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. Learn Does knob and tube wiring have asbestos? Three old-house materials can sit right where a rewire goes: the wire's own covering, the paint on the plaster, and the fill in the attic. Here is what is known, what has to be tested, and how each changes the job. Decision Guide Does a panel upgrade remove knob and tube? Swapping a fuse box for breakers changes what protects the circuits, not the wire inside the walls. Here is what that means for code, insurers, Mass Save and your budget. Learn 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. 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.