A lightning strike on your house isn’t always obvious. Sometimes there’s a dramatic boom and visible damage, but other times the strike hits a utility line or travels through wiring with no immediate sign on the outside. The clues fall into a few categories: what you can see on the exterior, what you smell inside, what stopped working, and what might be smoldering out of sight.
Exterior Damage You Can Spot
Start outside. Walk the perimeter of your home and look up at the roof, chimney, and siding. Lightning carries extreme heat, so the most common signs are burn marks, charring, or discoloration on roofing materials and siding. Shingles may be cracked, displaced, or missing entirely. Exterior paint can blister or peel away from the heat. On brick chimneys, you may see chipped or fractured masonry. Wood trim or fascia boards can be splintered along the grain, sometimes blown apart in a line running down the side of the house.
If your home has vinyl or composite siding, look for areas that appear melted or warped. Small holes or cracks in building materials are another giveaway. These marks are sometimes subtle, especially on a dark-colored roof, so use binoculars or take photos from different angles if you can’t safely get closer.
Unusual Smells Inside the House
One of the most reliable early indicators is smell. Lightning superheats the air around it, splitting oxygen molecules and creating ozone. Ozone has a sharp, clean scent that people often compare to chlorine or the crisp smell you notice before a spring rain. If that smell is strong inside your home right after a storm, lightning likely struck very close or made direct contact.
A different smell, more like burning plastic or hot wires, points to electrical damage inside your walls. That odor means insulation on wiring has melted or components have overheated. Don’t dismiss it. Burning smells after a storm warrant a careful check of every room, especially near outlets, light switches, and your electrical panel.
Electrical Failures and Fried Electronics
Lightning doesn’t need to hit your roof to damage what’s inside. It can travel through power lines, phone lines, or cable wiring and send a massive surge into your home’s electrical system. The results are often immediate and widespread.
Check for these signs:
- Circuit breakers that won’t reset. A tripped breaker after a storm is common, but one that refuses to stay in the “on” position suggests internal damage to the breaker itself.
- Scorched or dead outlets. Look at outlets and light switches for black marks, a burning smell, or any that simply no longer work.
- Dead electronics. TVs, computers, smart home devices, and gaming consoles are especially vulnerable. A surge can fry circuit boards instantly.
- Hardwired system failures. Your HVAC unit, pool pump, garage door opener, or security system may stop working even if portable electronics survived.
- Damaged modems and routers. Devices connected to both a power outlet and a phone or coax cable line are particularly at risk, because the surge can enter through either path. Fried modems are one of the most common casualties of a nearby strike.
A strike on a utility line several houses away can still damage your equipment. In one documented case, a home four doors from a direct strike lost every piece of electrical equipment inside, while a neighbor even farther away lost only a modem that happened to be connected to both mains power and a phone line. The damage pattern can be unpredictable.
Checking Your Attic for Hidden Damage
This is the step most people skip, and it’s the most important one. Lightning can ignite roof framing or insulation, and the fire may smolder for hours before producing visible smoke or flames. If you suspect a strike, grab a flashlight and a fire extinguisher and carefully inspect your attic.
Look for charred rafters or roof decking, singed or discolored insulation, and nail pops where fasteners have been pushed out by the force of the strike. Check around any roof penetrations: vents, skylights, dormers, and solar panel mounts are common entry points. If you see daylight coming through the roof decking where there wasn’t a gap before, lightning may have punched through. Smell for ozone or smoke. Embers can hide in insulation and continue to smolder, so don’t just glance around and leave.
Gas Line Risks Worth Knowing
If your home uses corrugated stainless steel tubing (CSST) for natural gas or propane, a lightning strike creates a specific hazard. CSST is a flexible, yellow-coated pipe that runs through wall cavities and across attic ceiling joists. A nearby strike can send a power surge through the tubing, puncturing it with tiny holes and potentially igniting leaking gas.
You may not know whether your home has CSST. It’s common in homes built or renovated since the 1990s. If you smell gas after a storm, or if you find yellow flexible tubing in your attic or basement that you weren’t aware of, have a licensed professional inspect it. Properly bonded CSST (grounded to your home’s electrical system with heavy-gauge copper wire) is far less vulnerable, but many older installations were never bonded correctly.
When to Call the Fire Department
If you hear a loud crack and believe your house was directly struck, calling the fire department is reasonable even if you see no flames. Firefighters carry thermal imaging cameras that detect heat signatures inside walls, ceilings, and attic spaces where smoldering material wouldn’t be visible to the naked eye. They’ll also check for burnt wiring and use the same smell-and-sight approach you would, but with better tools and training to catch hidden hotspots.
You don’t need to see active fire to justify the call. A smoldering rafter behind drywall can take hours to break into open flame, and by then the damage is far worse. Fire departments respond to these calls routinely during storm season.
What to Do With What You Find
If you find any of these signs, document everything with photos before touching or repairing anything. Your homeowner’s insurance typically covers lightning damage, and the adjuster will want evidence of the original condition.
For electrical damage, have a licensed electrician inspect the full system, not just the outlets that look scorched. Breakers can be damaged internally in ways that aren’t visible but leave them unable to trip during a future overload, which creates an ongoing fire risk. Surge damage to wiring inside walls is impossible to assess without professional testing.
For structural damage, a roofing contractor can evaluate whether the strike compromised your roof’s waterproofing, and a general contractor can assess framing if there’s evidence of charring on rafters or joists. Even if the damage looks minor from the outside, the path lightning takes through a structure can weaken materials in places you’d never think to check.