Quick answer
Water coming in under a door when it rains is usually a worn door sweep, a threshold that has lost its seal, no sill pan under the threshold, clogged weep holes in a sliding door track, or a step or patio that slopes toward the house. Soak up the water, watch where it enters during the next rain, and check outside. Then look just inside the door for lifted flooring, soft spots and swollen baseboards, which mean the water went under the floor. Call (888) 840-6512 to reach a certified water damage restoration company in your area; the line is answered 24/7.
Written & reviewed by Marcus ReedIICRC WRT
Reviewed September 30, 2026· Next review Mar 2027
Water coming in under a front door, a back door or a sliding glass door during rain is usually a threshold problem: a worn door sweep, a threshold that has lost its seal, a sill pan that was never installed, or a patio or step that slopes toward the house. The puddle on the floor is the part you see. The part you do not see is the subfloor and the bottom of the wall on either side of the door.
What to Do Now
- 1Soak up the water and block the gap. Towels along the threshold and a wet vacuum on the floor. A rolled towel against the bottom of the door stops the next rain from coming straight in.
- 2Watch where it comes in during the next rain. Look under the door sweep, at the corners of the threshold, down the door frame, and along the bottom track of a sliding door.
- 3Check the outside. Look at whether the step, patio or deck slopes toward the door, whether a gutter above dumps water onto the doorway, and whether the caulk around the frame is cracked.
- 4Check the floor and the walls next to the door. Look for dark or lifted flooring, soft spots just inside the door, and swollen baseboards on either side. Those mean the water has gone under the floor, not just across it.
Where the Water Gets In
| Where you see it | Likely cause |
|---|---|
| Straight under the middle of the door | Worn or missing door sweep, or the threshold too low |
| At the corners of the threshold | Failed seal between threshold and frame, or no sill pan |
| Down the side of the frame | Cracked caulk or flashing around the frame |
| Along a sliding door track | Clogged weep holes in the track, water overflowing it |
| Only in heavy rain from one direction | Wind pushing rain against the door; needs a storm door or overhang |
| Whenever it rains, from outside grade | Patio, step or ground sloping toward the house |
Sliding doors are a common case. Their bottom track has small drain holes on the outside face that let water out. When those holes clog with dirt, the track fills and overflows to the inside. Clearing them with a wire or a small vacuum often fixes it.
Rising water from a flood outside is a different problem from rain coming in at a door. This page is about rain getting past the door itself.
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The Damage You Cannot See
Most exterior doors sit on a subfloor that runs under the threshold. Water that gets past the threshold soaks into that subfloor edge and the rim joist below, and runs under laminate, vinyl or hardwood. Under a finished floor it dries slowly, and wet wood starts growing mold in about 24–48 hours. The wet subfloor page explains when that wood can be dried and when it is replaced.
Who Fixes What
A door installer or handyman replaces the sweep, reseals or replaces the threshold, and adds a sill pan. A contractor regrades a patio or step that slopes the wrong way. If the floor inside the door is soft, the flooring has lifted, or the baseboards are swollen, a restoration company measures the subfloor and the wall, dries what can be dried and removes what cannot. Clean-water drying runs around $3–$7 per square foot.
If the floor just inside your door is soft or the flooring has lifted, (888) 840-6512 is answered 24/7 and connects you with a certified restoration company that serves your area. The company gives you an arrival window for your address on the call, and there is no charge for the referral.
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Frequently Asked Questions
Why is water coming in under my door when it rains?
The door sweep is worn, the threshold seal has failed, there is no sill pan under the threshold, wind is driving rain against the door, or the ground, step or patio outside slopes toward the house.
Why does my sliding glass door leak when it rains?
The bottom track has small weep holes on the outside that let water drain. When they clog with dirt, the track fills and overflows inward. Clearing them often fixes it.
How do I stop rain coming under my front door?
Replace the door sweep, adjust or reseal the threshold, caulk the frame, and add a drip cap or overhang if the door takes rain directly. A door installer can add a sill pan if there is none.
Can water under a door damage the floor?
YesIt soaks the subfloor edge and rim joist under the threshold and runs under laminate, vinyl or hardwood, where it dries slowly and can grow mold in about 24–48 hours.
Is water under my door a flood?
Rain getting past the door is a leak at the door. Rising water from outside is a flood, which is a different problem and a different kind of cleanup.
Who do I call right now for water damage?
Call (888) 840-6512. The line is answered 24 hours a day, seven days a week, and connects you with an IICRC-certified water damage restoration company that serves your area. Describe what you can see — where the water is coming from, how long it has been there, and whether it smells — the more specific you are, the faster the right company is on the line.
If the source is a pipe or an appliance, shut the main water valve first. Have four things ready and the call goes quickly: the address, when the water started, what is wet now, and whether you have filed an insurance claim.
Still not sure which of these is your situation? (888) 840-6512 · toll-free · answered 24/7
Sources
- IICRC S500 Standard for Professional Water Damage Restoration
- EPA — A Brief Guide to Mold, Moisture and Your Home
Methodology: How we source and verify data · Report an error
Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.
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