To hire a knob and tube electrician in Philadelphia, first confirm the electrical contractor license is active with L&I and that insurance is on file, then settle in writing who files the permit and arranges inspection. After that, judge old-house skill by how each contractor plans to trace circuits, route through plaster and document what remains.
Philly Knob & Tube organizes knob and tube replacement in Philadelphia, and the wiring on each project is done by licensed, insured electrical contractors. Whoever you hire, this guide gives you a way to screen them: the Philadelphia rules first, then the questions that reveal whether someone understands old houses, then the paperwork and warning signs.
Philadelphia licensing and permit responsibilities
Philadelphia sets a clear floor. Under L&I’s rules, all electrical work must be performed by a licensed electrical contractor. For that license to count, three things must be true: the license is active, the contractor is current on City taxes, and proof of insurance is on file with L&I. A homeowner cannot rewire their own house in Philadelphia, and a handyman cannot do it under someone else’s license.
You can check the license yourself through L&I’s licensed contractor search. Look up the business, confirm the license type is electrical contractor and that it is active, and note the exact legal name. That name should match the proposal, the contract and, later, the permit.
Insurance deserves its own question. L&I requires insurance on file, but you should still ask for a certificate of insurance showing general liability and workers’ compensation, with your address as the job location. A worker injured in your basement is a risk you do not want to carry.
On the permit, ask three things directly:
- Who files it in eCLIPSE? It should be the contractor, acting as your authorized agent.
- Which inspection agency will inspect the work? Philadelphia uses licensed third-party electrical inspection agencies, hired by the owner or the owner’s agent.
- Does the scope need a Building Permit as well? The contractor should know and say so on the application.
The permit guide explains each of these in detail, including how the fee is calculated.
Old-house experience questions worth asking
A license proves legal standing; it does not prove someone has rewired a plaster rowhouse. These questions draw out real practice. Listen for specific, causal answers, not reassurance.
“How will you find out which circuits are still knob and tube?” A good answer involves mapping circuits at the panel, switching them off one at a time, tracing runs in the basement and attic, and testing. A weak answer is “we’ll see when we open the walls.” The inspection checklist lists what a proper assessment covers.
“What happens when you find modern cable spliced into old wiring?” Remodeled houses often have newer outlets fed by original conductors upstream. An experienced electrician expects this and explains how they would trace and replace the hidden feed. The mixed wiring guide describes the problem.
“How do you deal with shared neutrals?” Old circuits sometimes share or cross neutrals, which causes new AFCI and GFCI devices to trip. Someone who has done this work will recognize the question. See the shared neutrals guide.
“How will you get cable to the second and third floors?” In an attached house this is the hardest part. Listen for talk of closets, chases, removing baseboards, fishing from the attic or basement, and small openings at top plates. Promises that no walls will be opened are a warning, not a strength.
“What will you do with the old wiring?” The answer should distinguish disconnecting old runs at both ends and documenting them from physically removing what is accessible.
“Have you worked in houses with BX or armored cable mixed in?” Many older Philadelphia houses have more than one generation of wiring. The knob and tube versus BX guide explains why that matters for scope.
References that match your house
References are more useful when they resemble your project. Ask for one or two past customers whose houses were similar in age and construction, ideally plaster walls and an attached or semi-attached layout, and whose jobs were similar in scope. When you call, ask what the walls looked like after the electrician left, whether the schedule held, how surprises were handled and what was in the final paperwork.
Do not expect a contractor to share customers’ addresses without permission, and do not expect a reference list for every type of job. What you are testing is whether the contractor’s description of their own work holds up when a customer describes it.
Comparing work plans rather than badges
Logos, slogans and star ratings tell you little about how a contractor will handle your house. A work plan tells you a lot. Ask each contractor to describe, in writing, the sequence they intend to follow: assessment, permit, which floors first, how circuits will be kept live for an occupied home, when rough-in inspection happens, what patching is included and what you receive at the end.
Two plans for the same house can differ for good reasons. One contractor may route through a closet stack, another through the attic. What matters is that each plan is specific to your house and that its trade-offs are explained. The quote comparison guide shows how to put two proposals side by side once you have them.
Contract terms to get in writing
Before work starts, the contract should say:
- Scope by circuit. Which circuits will be replaced, which new circuits added and which, if any, will remain knob and tube.
- Exclusions. Patching level, painting, panel or service work, and removal of abandoned wiring.
- Price and payment schedule. Payments tied to milestones, such as permit issued, rough-in passed and final passed, rather than large sums up front.
- Change process. How hidden conditions will be priced and that you approve changes before the work proceeds.
- Permit and inspection. Who files, which agency inspects and who pays each fee.
- Completion documents. A written circuit list, inspection results and an invoice that describes the electrical scope.
Payment terms deserve a second look against the market. The Philadelphia cost guide gives a planning range for a substantial whole-home job, which helps you judge whether a deposit request is proportionate to the work.
This is not legal advice; for a large contract, having it reviewed is reasonable. The point is that each of these items is easier to agree on before the walls are open than after.
When a company manages the job
Not every rewiring project is hired directly from the electrician who does the work. Some homeowners hire a general contractor who brings in an electrician, and some work with a company, such as Philly Knob & Tube, that manages the knob and tube project while licensed electrical contractors perform the electrical work. Either arrangement can work well. What changes is what you need to check.
First, find out which licensed electrical contractor will actually do the work and appear on the permit, and look that business up the same way you would if you were hiring it directly. The license that matters is the one on the permit, not the logo on the proposal.
Second, ask who your point of contact is during the job and who answers for problems after it. If the managing company coordinates scheduling, patching and paperwork, it should say so in writing, along with what the electrical contractor is responsible for.
Third, confirm that the completion documents name the electrical contractor and the inspection agency. An insurer or buyer will want to trace the work to a licensed party, and a document that names only the managing company may not satisfy them.
Communication during the work
Rewiring an occupied house means circuits going off and on over several days, openings in rooms you are living in, and decisions that come up when walls are opened. Ask each candidate how they handle that. Good answers are specific: which circuits will be off each day, how you will be told when a hidden condition changes the plan, how dust is contained around openings and how the house is left at the end of each day.
Ask, too, who will be on site and whether that person can make decisions about routing and changes, or has to call someone first. Neither is wrong, but you want to know before a question comes up with a wall half open. The guide to living at home during rewiring covers what the household side of that looks like.
Warning signs in scope and documentation
A few patterns should make you slow down:
- The contractor suggests skipping the permit, or asks you to file it in your name.
- The license name does not match the business on the proposal.
- The quote is given by phone without anyone seeing the house.
- A panel replacement is presented as the fix for knob and tube. It is not; branch wiring is separate, as the panel upgrade comparison explains.
- A three-prong outlet swap is offered as “grounding” the house.
- Someone guarantees your insurer will accept the result.
- The final paperwork is promised verbally but not described in the contract.
Any one of these may have an explanation. Ask for it. A contractor who understands old houses and Philadelphia’s rules will usually have a clear one.
When you have a shortlist, a knob and tube inspection gives each bidder the same circuit map to price from, and the whole-home rewiring service describes the scope most whole-house projects follow. To talk through your house, use the contact page.
