Estimated Read Time: 9 minutes
If your home still has knob-and-tube, you already know the worry: warm outlets, flickering lights, and insurance headaches. Here’s a clear, local guide on how to replace knob and tube wiring with Romex the right way, with permits, code compliance, and minimal mess. We’ll cover timelines, costs, inspections, and smart add-ons that protect your Orlando-area home and budget.
What Is Knob-and-Tube and Why You Should Replace It
Knob-and-tube (K&T) is an early 1900s wiring method that uses porcelain knobs and tubes to route single-insulated conductors through framing. It lacks an equipment grounding conductor, which modern electronics and surge protectors rely on. Splices are often buried and unboxed, and the cloth insulation becomes brittle with heat and age.
Homeowners notice warning signs like dimming lights, frequent breaker trips, or outlets that feel warm. These are not just annoyances. They are safety flags and can void insurance. Many carriers either surcharge or refuse coverage on homes with active K&T because it increases fire risk.
Replacing K&T with modern NM-B cable, commonly called Romex, improves safety, capacity, and resale value. It also enables today’s protection requirements such as arc-fault and ground-fault protection in living areas, kitchens, and bathrooms.
"Del-Air was fantastic! Big job for big house! Very knowledgeable and supportive of our needs. Keep up the great work! Couldn't be happier with your services."
Can You Replace K&T With Romex? Yes, But Follow Code and Get a Permit
You can replace K&T with NM-B (Romex) in most Florida homes, including bungalows in College Park, Lake Eola Heights, and older properties around Kissimmee and Davenport. The key is doing it to code and with a permit.
Two hard facts to know:
- Permits are required for rewiring in Florida. Permits trigger inspections that verify safety and code compliance. Your contractor should pull the permit and coordinate with the local authority having jurisdiction.
- The National Electrical Code requires arc-fault protection in most habitable rooms (NEC 210.12) and ground-fault protection in locations like bathrooms, kitchens, garages, and outdoors (NEC 210.8). Your new Romex circuits must meet these protections.
A licensed electrician will map your existing circuits, size new home runs, and ensure proper grounding and bonding. Expect coordination with the utility for panel shutdowns and city or county inspections before and after rough-in.
Step-by-Step: How Pros Replace Knob-and-Tube With NM-B (Romex)
A professional rewire is a structured, low-disruption process:
- Initial evaluation and plan
- Inspect existing wiring, panel capacity, grounding, and visible K&T runs.
- Identify circuits to replace, fixture counts, and any unsafe splices.
- Produce a room-by-room scope with materials and timeline.
- Permits and scheduling
- Pull permits, post the card, and schedule work windows to reduce downtime.
- Coordinate any power cutover with the utility and arrange inspection dates.
- Safety prep and protection
- Floor and furniture protection in work zones.
- Power safely shut off to target circuits; lockout/tagout protocols.
- Strategic cable routing
- Use attics, crawl spaces, and closets to snake NM-B with minimal drywall cuts.
- Drill top and bottom plates with proper bushing and staple spacing.
- Abandon K&T in place if allowed by the inspector, or remove when accessible.
- Device and box upgrades
- Replace old, shallow boxes with code-compliant boxes sized for conductor count.
- Install tamper-resistant receptacles, GFCI/AFCI protection where required, and new switches.
- Panel work
- Label new circuits clearly.
- Install new breakers or a modern load center if needed.
- Grounding and bonding
- Verify grounding electrode system, bonding of metal piping, and add grounding where missing.
- Rough-in inspection
- Inspector verifies staples, box fill, support, and routing.
- Close-up and finish
- Patch minimal access holes.
- Re-energize circuits, test loads, and verify polarity and GFCI/AFCI function.
- Final inspection and walkthrough
- Demonstrate labeling, test buttons, and provide documentation.
"I just have AC/Heat wiring replaced and run to the attic by DelAir AC technician Roberto Lyva. He did a great job and I am very with the quality of work he did."
Planning the Right Circuit Layout and Loads
Good planning saves time and repairs. Your electrician will:
- Calculate loads per NEC Article 220 to ensure capacity for kitchens, laundry, and HVAC.
- Separate dedicated circuits for appliances like microwaves, disposals, and bathrooms.
- Place receptacles per spacing rules so cords do not cross doorways or be unsafe.
- Use 12 AWG on 20-amp general circuits when appropriate for durability and future demand.
- Map lighting on separate circuits so a tripped receptacle breaker does not put rooms in the dark.
A thoughtful layout also considers future upgrades like EV charging, hot tubs, or an induction range. Stub-outs and spare capacity are inexpensive now and costly later.
Essential Upgrades To Pair With a Rewire
When walls and attics are open, it is smart and cost-effective to add protection and capacity.
- Panel upgrade or replacement
- Replace outdated or recalled panels and add spaces for dedicated circuits.
- Modern load centers improve labeling and protection options.
- Grounding and surge protection
- Upgrade the grounding electrode system and bond metal piping.
- Whole-home surge protection guards sensitive electronics from lightning and utility spikes common in Central Florida storms.
- Smoke and CO safety
- Install interconnected, hardwired smoke and CO alarms so all units sound together.
- Lighting and controls
- Convert to LED, add dimmers, and consider smart switches for schedules and energy savings.
These add-ons are easier and cheaper to complete during a rewire than as separate projects.
Safety, Insurance, and Resale Benefits
Replacing K&T with Romex boosts life safety by adding grounding and modern protection. It also helps with underwriting. Many insurers request written proof that active K&T has been removed before binding or renewing policies. Buyers and home inspectors in Orlando, Kissimmee, and Winter Haven often flag active K&T, which can stall closings or force price concessions.
With a permitted rewire, you receive inspection records and a labeled electrical system that signals quality to buyers and appraisers. The result is a safer home, simpler insurance, and better resale confidence.
Timeline and Cost Drivers in the Orlando Area
No two homes are alike, but a typical single-family rewire in South Orlando takes 3 to 7 working days, plus inspection time. Larger homes, plaster walls, or tight crawl spaces take longer. Here are the top cost variables:
- Size and age of the home
- Accessibility of attics and walls
- Panel capacity and need for service upgrades
- Number of devices, fans, and lighting fixtures
- Required drywall repairs and paint touch-ups
- Add-ons like surge protection, grounding, or EV circuits
Financing can spread project costs over time. Free on-site estimates for rewires and panel projects help you scope options before committing.
What To Expect From a Code-Compliant Rewire
Professional standards matter. Here is what solid workmanship looks like:
- Proper support and staple spacing for NM-B
- Box fill calculations and correct wire nuts or push-in connectors listed for copper
- Tight, clockwise looped device terminations under the screw head
- Arc-fault and ground-fault protection installed and tested
- Neat, readable circuit directory in the panel
- Voltage, polarity, and GFCI/AFCI function verified on every circuit
At final walkthrough, you should receive a labeled directory, explanation of breaker types, and tips for maintenance.
DIY vs. Hiring a Licensed Electrician
Partial DIY may be allowed for homeowners on their primary residence, but whole-home rewiring is not a good DIY target. Hidden splices, load calculations, and inspection scheduling can go wrong fast. More important, incorrect terminations or overfilled boxes can cause overheating.
A licensed, bonded, and insured contractor carries the right permits, knows local inspectors, and can coordinate utility cutovers. That is the path to a passed inspection and a safe, dependable result.
Choosing the Right Orlando-Area Rewire Partner
When you evaluate electricians in Orlando, Kissimmee, Davenport, Lakeland, and Winter Haven, ask for:
- License and insurance verification
- Permit pulling and inspection coordination
- Room-by-room scope with device counts and patching plan
- Panel evaluation and grounding plan
- AFCI/GFCI strategy and surge protection options
- Timeline, crew size, and work-hour plan to reduce downtime
- Clear pricing with change-order rules
You want a partner who works in Central Florida every day, understands local code interpretations, and can finish with minimal disruption to your routine.
Aftercare: Testing, Labels, and Maintenance
Once the rewire is complete:
- Test GFCI and AFCI monthly using the test button.
- Keep the panel directory updated when you add devices or remodel.
- Replace burned-out bulbs with the correct wattage to avoid overheating fixtures.
- Consider an annual electrical inspection as part of a maintenance plan for peace of mind.
A well-documented, labeled system makes future repairs faster and cheaper.
Frequently Asked Questions
How much does it cost to replace knob-and-tube with Romex?
Costs vary by home size, access, and panel needs. A licensed electrician will provide a free on-site estimate that details devices, panel work, drywall repairs, and add-ons like surge protection.
Do I need a permit to rewire my home in the Orlando area?
Yes. Rewires require a permit and inspections. Your electrician should pull the permit, coordinate with the utility, and schedule rough and final inspections.
Can I replace only part of my knob-and-tube wiring?
Partial replacements are possible, but insurers often want all active K&T removed. Full rewires ensure grounding and modern AFCI/GFCI protection throughout the home.
How long does a whole-home rewire take?
Most projects take 3 to 7 working days, plus inspection time. Larger homes or limited access spaces can extend the schedule.
Will you need to open my walls?
Usually there are small, strategic access holes. Pros route cable through attics, closets, and crawl spaces to limit drywall work, then patch and finish as part of the scope.
In Summary
Replacing knob-and-tube with Romex delivers safety, insurance approval, and resale confidence. With permits, inspections, and a clean plan, most Orlando-area rewires finish in under a week and set you up for decades of safe power. Ready to replace knob and tube wiring with Romex in Orlando, Kissimmee, or Davenport? Call (407) 710-2048 or schedule at https://www.delair.com/south-orlando/.
Ready to Get Started?
- Call now: (407) 710-2048
- Schedule your free rewire evaluation: https://www.delair.com/south-orlando/
- Ask about panel, grounding, and surge protection bundles to save time and money during your project.
About Del-Air Heating, Air Conditioning, Plumbing and Electrical
For over 40 years, Del-Air has served South Orlando with licensed, bonded, and insured electricians (License #EC13013085). We are BBB-accredited with an A+ rating and known for same-day service and 24/7 support. Our team navigates Florida codes, secures permits, coordinates inspections, and backs every job with transparent pricing and clear communication. From rewires to panel and surge upgrades, we deliver safe, efficient results.