Water entering around a window frame
Water at a window is usually entering at the junction between frame and wall rather than through the window itself. Sealant has a finite life, and the sill and reveal details are where driven rain concentrates.
Stable enough to schedule properly. Best resolved before the next monsoon rather than during it.
Probable causes, ranked
Ordered by how often we find each one to be the actual source. The 'tell' is what distinguishes it from the others.
- 01most common
Perimeter sealant aged, split or debonded
The tell — A visible gap or split along the frame edge.
Expansion Joint Treatment → - 02common
No drip mould or fall on the external sill
The tell — Water runs back under the sill toward the wall.
External Plaster Work → - 03common
Cracked plaster at the reveal
The tell — Internal damp forms a band around the opening.
External Plaster & Painting → - 04less common
Failed window drainage channels
The tell — Water collects inside the frame itself before overflowing.
Tape Based Treatment →
Sixty seconds, before you call anyone
- Photograph it while it is actively wet. A dried stain tells a surveyor far less than a running one.
- Note whether it worsens with rain or with usage. Rain-linked points to the building envelope; usage-linked points to plumbing. This single distinction settles most arguments about responsibility.
- Check the area directly above and beside the damage, not only below it. Water travels along a slab before it drops.
- Look specifically for the tell of the most likely cause: a visible gap or split along the frame edge.
- Do not chip into saturated plaster or paint over a damp patch. The first risks bringing material down; the second destroys the evidence needed to trace the path.
What it becomes if you leave it
Usually modest if addressed early. Left alone, water reaches the lintel reinforcement above the opening, at which point a sealant job becomes a structural repair over a window.
Often seen alongside this
- Water seeping through an external wall during rain
Water passing through an external wall means the render is no longer shedding it.
- Damp patch spreading on an internal wall
A damp patch on an internal wall means water is reaching the wall from somewhere you cannot see — usually the external face, a concealed pipe, or the slab above.
Water entering around a window frame — questions we get asked
What is the most likely cause of water entering around a window frame?
Perimeter sealant aged, split or debonded. The sign that points to it is: a visible gap or split along the frame edge. That said, the ranking here is a starting point — the actual source is confirmed by survey, because more than one of these can be true at once.
What happens if I leave it?
Usually modest if addressed early. Left alone, water reaches the lintel reinforcement above the opening, at which point a sealant job becomes a structural repair over a window.
Can I diagnose this myself before calling anyone?
Partly, and it is worth doing. Photograph it while it is actively wet, note whether it worsens with rain or with usage, and check the area directly above and beside the damage. That single rain-versus-usage distinction narrows the cause more than anything else you can do in sixty seconds.
How urgent is this?
Plan it. Stable enough to schedule properly. Best resolved before the next monsoon rather than during it.
Send us a photograph and we will tell you what we think it is
WhatsApp a photo taken while it is wet, with a note on whether it tracks with rain or with usage. That is usually enough for a first opinion, and the site inspection that follows is free.
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