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Water seeping under an external door in the rain
After rain, water appears on the floor just inside an external door — a terrace door, a garden door or a service door — while the door itself and the frame look dry. The water may puddle at the threshold or run a little way into the room. When the door is dry but the floor is wet, the water is coming in under the door, not through it.
Waterproofing
Active ingress during rain is prioritised. Tracing and permanent repair are scheduled once the source is identified.
Call nowRequest a check on WhatsApp01LIKELY CAUSES
What usually sits behind this symptom, and what tells one cause from another.
A failed or missing threshold seal
The seal under the door or in the threshold has perished, compressed or been pulled away, leaving a gap for water.
A weather bar that has lifted or been removed
The bar across the bottom of the door or threshold is loose, corroded or gone, so water runs straight under.
The threshold sitting level with, or below, the outside
The outside paving or deck has been built up over time, so water is driven across a threshold that is now too low.
Water tracking from an adjacent wall or frame
The water is not coming under the door but down the frame or wall beside it, and pooling at the floor.
02BEFORE ANYONE VISITS
What you can safely check.
- Check whether the door and frame are dry and only the floor is wet.
- Look at the seal and the weather bar along the bottom of the door for gaps.
- Note whether the outside surface slopes toward the door or away from it.
- Mop up after each rain and mark where the water first appears.
03WHAT WE MEASURE
We check the seal and the weather bar along the threshold, then look at the level of the outside surface against the door. A hose test along the bottom edge, run gently from outside, shows exactly where water is getting under, and separates a threshold fault from water tracking down the frame.
04IN A VILLA
Villa thresholds sit between the climate inside and everything the garden and the weather throw at them, and the outside paving around a villa is often adjusted over the years — a new deck or a re-levelled path can quietly raise the outside level until water runs toward the door instead of away from it.
05THE FIX
Which repair, and when.
Water running under a door each time it rains keeps the floor, the threshold and the base of the frame wet. Over time it lifts flooring, stains the finish and rots the bottom of the frame — a small seal becomes a door and floor repair.
Replace the threshold seal or weather bar
The seal or bar has failed and the threshold is otherwise sound.
Re-seal and bed the threshold
The threshold itself has lifted or is letting water through its fixings.
Correct the outside level or drainage
The paving outside now slopes toward the door and needs a drain or a fall away from it.
06WHAT DECIDES THE FIX
The same symptom can lead to different repairs. These are the things that decide which way it goes.
- Where the water first appears — at the centre of the threshold points at the seal, while at the ends it points at the frame or the corners.
- What the weather bar looks like — a corroded or lifted bar is a simple replacement.
- How the outside sits — paving that slopes toward the door needs drainage, not just a new seal.
- Whether the door is used often — a heavily used door wears its seal faster.
- What the hose test shows — the exact entry point decides between a seal, the threshold or the frame.
07HOW A VISIT GOES
What to expect when we come out, and why the order matters.
Inspect the seal and bar
The seal and weather bar along the bottom are checked for gaps, corrosion and lift.
Check the outside level
The fall of the outside paving against the threshold is looked at.
Hose test the threshold
Water is run gently along the bottom edge to see exactly where it enters.
Replace, reseal or drain
The seal or bar is replaced, the threshold resealed, or a drain and fall added outside.
Re-test with water
The hose test is repeated to confirm the water now stays outside.
08KEEPING IT FROM RETURNING
Once it is fixed, these steps make the fault less likely to come back.
- Keep the weather bar and threshold seal in good condition and replace them when they harden or crack.
- Watch the outside level if you add decking or paving near a door.
- After heavy rain, check the floor inside external doors for the first sign of water.
- Re-seal the ends of the threshold where it meets the frame, which is where water sneaks around.
- Check the outside fall against external doors after any paving, decking or landscaping change.
09Typical villa waterproofing work
Quoted after survey — always
Cost is driven almost entirely by what the tracing finds and how much has to be lifted to reach it. We do not price waterproofing over the phone, because a number given before the source is located is a guess.
10QUESTIONS
- Is it the door or the floor seal?
- If the door and frame are dry and only the floor is wet, the water is coming under the door. The seal, the weather bar or the outside level is where to look.
- Why does it only happen in heavy rain?
- Light rain runs away or dries before it reaches the threshold. Heavy or wind-driven rain is what pushes water across a threshold that has lost its seal.
- Can I fix it with a new seal myself?
- A simple seal replacement can help if that is the only fault, but if the threshold or the outside level is the problem, the water will come back. Finding the entry point first is the safer route.
- Will it damage the floor?
- Over time, yes. Repeated wetting lifts flooring and stains finishes, and water at the frame can rot the timber at the bottom.
- Why does water come in even when the door is closed?
- Because the door leaf itself may be fine — the gap is under it, at the seal or the threshold, where wind-driven rain is pushed through.
- Does the direction of the rain matter?
- Yes. Rain driven against the door is what overcomes a weak threshold, which is why the same door can be dry in one storm and wet in another.
- Is a new seal enough, or do I need a new threshold?
- A new seal is enough when the seal alone has failed. If the threshold has lifted or the outside level is wrong, the threshold or the drainage needs attention too.