How to Add or Fix Weatherproofing on an Outdoor Outlet (In-Use Bubble Cover + Gasket)

My exterior outlet's flip-up cover is cracked, won't stay closed, or gets water inside when something is plugged in. How do I add or fix proper weatherproofing on an outdoor outlet so it passes code and stays dry?

Swap the flimsy flip-lid for a bubble-style "in-use" cover with a fresh gasket, and make sure the receptacle is a weather-resistant (WR) type that's GFCI-protected. This keeps rain out whether or not a cord is plugged in. The cover-and-gasket swap is a quick 20-30 minute DIY job once you kill the breaker.

ℹ️ Reference only: For general reference only. This guide does not guarantee any result — every home is different. Verify against your local building codes and a licensed professional before acting, especially for electrical, gas, plumbing, structural, or roof work.

💵 $8-$20 for an in-use 'extra duty' bubble cover with gasket; $15-$30 for a WR tamper-resistant GFCI receptacle if you replace it; ~$5 for a tube of exterior caulk. DIY total roughly $15-$55. An electrician doing the receptacle plus cover typically runs $120-$250 including a service-call minimum. ⏱ 20-30 minutes for a cover/gasket swap; 45-60 minutes if you also replace the receptacle with a WR GFCI. ● Use caution

Safety: This is 120V line voltage. Always shut the breaker off and verify the outlet is dead with a tester before removing the cover or touching wires — outdoor outlets often share a circuit with other things, so a nearby switch isn't enough. Outdoor receptacles must be GFCI-protected; if yours isn't, treat it as a real shock/electrocution hazard and prioritize fixing it. If you see scorching, melted plastic, aluminum wiring, or water actively inside a live box, leave the breaker off and call an electrician.

Common causes

You only have a flat flip-up cover (snap lid), which leaves a gap and lets water in whenever a cord is plugged in. Code (NEC 406.9(B)) requires an 'in-use'/bubble cover for outdoor receptacles in wet locations. (most common)
Quick check: Plug something in and look: if the lid props open and the slots are exposed to the sky, it's the wrong cover.
Missing, hardened, or torn gasket behind the cover plate, so water wicks in behind the plate even when nothing is plugged in. (common)
Quick check: Pop the cover and look for a foam/rubber gasket; if it's brittle, flattened, or absent you've found the leak path.
The receptacle is a standard indoor outlet, not a weather-resistant (WR) one, and/or it isn't GFCI-protected. Outdoor outlets must be WR and GFCI-protected. (common)
Quick check: Look at the outlet face for the letters 'WR' and a TEST/RESET button (or a GFCI device/breaker upstream).
Wrong cover orientation. A cover installed so the lid opens upward or sideways can funnel water toward the slots instead of shedding it down and away. (less common)
Quick check: Check that the lid and any drain opening let water run down and out, not pool toward the receptacle slots.
Cover is mounted but the box behind it isn't sealed to the siding, so water gets in behind the whole box. (less common)
Quick check: Look for an existing caulk line on the top and sides of the box; the bottom should stay open to drain.

How to fix it

Turn off power at the breaker for that outlet, then confirm it's dead with a non-contact voltage tester or plug-in tester. Do not skip this. The outlet stays live until you verify zero voltage.
Unscrew and remove the old cover plate and gasket. Note the box orientation (vertical vs. horizontal) and count the gangs (single-gang is most common).
Buy a matching in-use (bubble) weatherproof cover, sized for 1-gang or 2-gang and marked 'extra duty' (NEC requires the 'extra duty' marking for in-use covers on outdoor walls). Kits include the right gasket.
While power is off, check the receptacle. If it isn't marked 'WR' or isn't GFCI-protected, replace it with a weather-resistant, tamper-resistant GFCI receptacle. Match wires to the same terminals as the old one: black (hot) to brass, white (neutral) to silver, bare/green to ground; on a GFCI, wire the always-hot supply to the LINE terminals. If wiring is unfamiliar, stop here and call an electrician.
Install the new gasket against the box, then mount the in-use cover. Orient it so the lid sheds water downward and the cord opening points down. Drive the screws snug, not cracking-tight.
Route any cord through the cover's notched opening at the bottom and confirm the bubble lid fully closes over a plugged-in cord.
Seal the box-to-siding gap with exterior-grade silicone or polyurethane caulk on the TOP and SIDES only — leave the bottom edge unsealed so any water that gets in can weep out.
Restore power, press RESET on the GFCI, and test with a GFCI outlet tester: the test should trip it and cut power; RESET restores it.

DIY or call a pro?

Replacing a cracked cover and gasket is solidly DIY — no wiring touched, just a breaker-off swap. Swapping the receptacle to a WR GFCI is intermediate DIY if you're comfortable matching wires after verifying the power is dead. Call a licensed electrician if there's no GFCI protection anywhere on the circuit, the box has unfamiliar or aluminum wiring (aluminum needs special CO/ALR-rated devices and connectors), the box is loose or rotted into the siding, or you can't confirm the circuit is de-energized.

Tools & parts

Non-contact voltage tester or plug-in outlet tester
Flathead and #2 Phillips screwdrivers
In-use (bubble) weatherproof cover, 'extra duty' rated, sized to your box (1-gang or 2-gang)
Replacement gasket (usually included in the cover kit)
Weather-resistant (WR) tamper-resistant GFCI receptacle (only if replacing the outlet)
Exterior-grade silicone or polyurethane caulk plus caulk gun
GFCI outlet tester (to confirm it trips)

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Based on: NEC 406.9(B) — receptacles in wet locations require a weatherproof enclosure that stays weatherproof with an attachment plug inserted (in-use/bubble cover); NEC 406.9(B)(1) — in-use covers in wet locations must be marked 'extra duty'; NEC 210.8(A) — GFCI protection required for outdoor receptacles; NEC 406.9(A)/406.4 — outdoor receptacles must be a listed weather-resistant (WR) type; Manufacturer installation instructions for in-use weatherproof covers (e.g., TayMac/Hubbell, Leviton)

General home-maintenance guidance, not a substitute for a licensed electrician or your local building code. Electrical codes (NEC adoption and local amendments) vary by jurisdiction and edition; verify requirements with your local building department and permit office before doing electrical work.