Published 2026-06-23 · by David Yifrach, Owner, Seaside Garage Door Experts · Virginia DPOR Class A Contractor #2705188091
We Found 5 Hampton Roads Garages Where a Dead Bottom Seal Was Padding the Dominion Bill
A failed garage door bottom seal can add real money to a Hampton Roads summer electric bill, because the gap it leaves lets conditioned air out and 91-degree air in at the one spot the Department of Energy says accounts for 10 to 13 percent of a home's total air leakage, the garage-to-home interface. Across five service calls this June, from Larchmont in Norfolk to Great Bridge in Chesapeake, we found the same thing behind a complaint about a hot bonus room or a climbing Dominion bill: a flattened, cracked, or curled bottom seal with a line of daylight under the door. Below is the pattern we saw, what the fix costs in 2026, and the three-minute pencil test that tells you whether your seal is the leak.
The pattern: five hot garages, one cause under the door
The calls did not start as seal calls. They started as a hot bonus room over the garage in Larchmont, a Dominion bill that jumped in Great Bridge, a musty draft in Churchland, and two homeowners in Ocean View who just said the garage was an oven. In all five, the air conditioning was working and the attic was insulated. The leak was the strip of rubber at the bottom of the garage door. Each seal was flattened, cracked, or curled at the corners, and when we crouched inside with the door down we could see a line of daylight running under it.
That daylight is the tell. A bottom seal is supposed to compress against the slab and block the single biggest opening in the house. When it fails, the garage stops being a buffer and starts being a vent, and any room that shares a wall or floor with the garage gets the heat and the bill.
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Why a quarter-inch gap costs you at 16.43 cents a kilowatt-hour
The Department of Energy puts the garage-to-home interface at 10 to 13 percent of a typical home's total air leakage, and the bottom seal is the largest single part of that interface. A failed seal that leaves a quarter-inch gap across a 16-foot door is the same as leaving a four-inch-tall slot open along the whole opening. In a Hampton Roads July, that slot lets 91-degree, humid air pour into a space your HVAC is fighting to keep reasonable, and at Dominion Energy's June 2026 residential rate of 16.43 cents per kilowatt-hour, the extra runtime shows up on the bill. It is not a dramatic number on its own, but it runs every hot hour of every summer day, and it stacks on top of a system that is already working hard against the humidity.
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Why coastal seals die in two to three years, not ten
Here is the part national pages miss. A standard vinyl bottom seal lasts seven to ten years inland and only two to three years on the Hampton Roads coast, because salt air and the region's roughly 70 percent average humidity, which peaks near 74 percent in August, break vinyl down fast. Add the ozone and UV off the water and a vinyl seal goes from flexible to flat and brittle in a couple of summers. That is why the five doors we looked at had all failed early. The fix is not just a new seal, it is the right material: EPDM rubber resists salt air, ozone, and UV far better than vinyl and holds its squeeze for years longer in a coastal garage, which is what we install on the water.
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What the fix costs, and the pencil test that tells you it is time
Bottom-seal replacement is one of the lower-cost things we do, and on the coast it pays for itself in comfort and on the bill. A single-car EPDM bottom seal is $249 and a two-car is $289. If the aluminum retainer that holds the seal is corroded, swapping it adds about $85, and a stainless-mesh anti-rodent core that keeps mice out of the same gap adds $40 to $80. When the door jambs have also rotted or the molding has pulled away, a combined two-car perimeter job that does the bottom seal plus the jamb stops runs $449 to $549.
You do not need us to tell whether your seal is the leak. Close the door, then from inside try to slide a standard quarter-inch pencil under the bottom edge. If it slides through, the gap is wide enough to leak air and let a mouse in. Look for daylight along the bottom, feel for a draft, and press the rubber to see if it springs back or stays flat. If it fails, it is time. You can read the full coastal breakdown in our guide to garage seals, rodents, and energy in Hampton Roads, see a real perimeter rebuild in our Sandbridge bottom-seal and doorstop case study, and find materials and pricing on our bottom seal and doorstop replacement page. We cover the bayfront and the southside from our Norfolk and Chesapeake service areas.
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Frequently asked questions
Can a bad garage door seal really raise my electric bill?
Yes. The Department of Energy puts the garage-to-home interface at 10 to 13 percent of a home's total air leakage, and the bottom seal is the largest part of it. A quarter-inch gap across a 16-foot door vents conditioned air all summer, and at Dominion's June 2026 rate of 16.43 cents per kilowatt-hour the extra HVAC runtime shows up on the bill, especially for a room over or beside the garage.
How much does it cost to replace a garage door bottom seal in Hampton Roads?
A single-car EPDM bottom seal is $249 and a two-car is $289. A corroded retainer swap adds about $85, a stainless-mesh anti-rodent core adds $40 to $80, and a combined two-car job that also does the jamb stops runs $449 to $549. EPDM is worth it on the coast because it outlasts vinyl by years in salt air.
How do I know if my garage door seal is letting air in?
Close the door and from inside try to slide a quarter-inch pencil under the bottom edge. If it slides through, the gap leaks air and lets pests in. Also look for daylight along the bottom, feel for a draft on a calm day, and press the rubber to see if it springs back or stays flat and cracked. Any of those means the seal has failed.
Why does my garage door seal keep failing every couple of years?
Salt air, humidity, ozone, and UV off the water. A standard vinyl seal lasts seven to ten years inland but only two to three years on the Hampton Roads coast, where average humidity runs near 70 percent and peaks around 74 percent in August. Switching to EPDM rubber, which resists salt air and ozone, gives you years more service in a coastal garage.
Does an insulated garage door matter if the bottom seal is bad?
Not much. An insulated door slows heat through the panels, but a failed bottom seal leaves an open gap at the floor that lets air move freely in and out, which bypasses the insulation. The seal is the cheaper fix and usually the bigger leak, so it is the place to start before spending on an insulated door.
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