Water is coming under my garage door. Who do I call?
Usually, start with
Garage-door professional
If water is entering primarily beneath a closed garage door, a garage-door professional commonly evaluates the bottom seal, threshold contact, door alignment, and the condition of the opening.
Change course if
Water is pooling or flowing toward the door from outside
A drainage professional may also be relevant when exterior water is being directed toward the opening.
The driveway or slab slopes toward the garage
Drainage or concrete expertise may be relevant when the surrounding surface is contributing to water movement.
Water is also entering through walls or floor joints
Waterproofing or foundation expertise may also be relevant when the door is not the only entry path.
Who handles what
Garage door
Evaluates bottom seals, door alignment, threshold contact, and weather sealing at the opening.
Drainage
Evaluates runoff, pooling, grading, and exterior water movement toward the garage.
Concrete
Evaluates surface conditions or elevation differences that may affect how water reaches the opening.
What might be happening
The visible path under the door can reflect a sealing problem, an alignment or threshold condition, exterior water being delivered to the opening, or a combination of these. The water path and the reason water is reaching the door are separate questions.
Useful things to notice
Where the door meets the floor
Visible daylight, uneven contact, damaged seal material, or a localized low spot can be useful to document.
What the water does outside
Note whether it pools at the threshold or flows toward the door.
Whether one side is worse
A one-sided entry pattern can help a professional evaluate alignment, surface level, and drainage conditions.
Before you call
Take photos of the full closed door from inside, the bottom seal, the threshold, and the exterior approach to the garage. If possible, document the water during rainfall.
Before you fix the visible symptom
A new seal may not solve water entry if the door is uneven, the threshold is irregular, or exterior runoff is being directed toward the opening. Identifying which condition is present first can prevent repeated seal replacement.
References
Door & Access Systems Manufacturers Association. Technical Data Sheet 1503, Wind-Driven Rain and Sectional Garage Doors: Reasonable Expectations.
Door & Access Systems Manufacturers Association. Technical Data Sheets: Commercial & Residential Garage Door, including TDS 197, Water Infiltration Under the Bottom of a Sectional Door.
U.S. Department of Energy, Building Science Education. Land is Graded: Final Grade Slopes Away from Foundation.