5 Ways to Stop Cold Air and Drafts Coming Under a Villa Door

If you hold your hand near the bottom of the door and feel a draft, the problem is almost never the leaf itself. The gap left between the leaf and the finished floor is necessary for the door to open and close — but if that gap isn't sealed off, it becomes the biggest air leak in the house.

1. Measure the gap first

Close the door, shine a flashlight from outside, and look from inside. If light gets through, the gap is over 3 mm. In a normal installation, the space between the bottom of the leaf and the floor should be 3–5 mm; anything above that is a direct leak. A gap of 10 mm or more, unless the floor was raised afterward, is usually an installation error.

2. A door sweep (brush strip)

This is the fastest fix. An aluminum profile screwed to the bottom of the leaf, fitted with a brush strip, seals the gap without letting the door drag. Getting it right requires two measurements: leaf width and the remaining distance to the floor. Too long, and the door struggles; too short, and it does nothing.

3. An automatic drop-down seal

This is a strip that drops down on its own when the door closes and retracts when it opens. It's set into the bottom edge of the leaf and stays invisible from outside. It costs more than a brush strip, but where the floor is stone or carpeted, it's the only realistic solution, since it doesn't drag.

Hard to describe the problem over the phone. Send a photo of your door and the problem area to 0532 689 21 46 on WhatsApp; in most cases we can tell what's going on just by seeing it. If a site survey is needed, it's free.

4. A threshold profile

The two fixes above sit on the leaf side. There's also a floor-side solution: an aluminum or marble threshold placed under the door opening both directs water drainage and gives the sweep a level surface to seat against. Without a threshold, a brush strip can't sit flush against an uneven floor.

5. Don't forget the frame seal

Once the bottom is fixed, air sometimes keeps coming in from the sides. On the doors we make, the seal runs around three sides of the frame and four sides of the leaf; a silicone-based rubber seal blocks air, dust, and pests together. If the seal on your current door has hardened, been crushed, or torn, replacing it is a job that takes a few hours.

Which fix, for which situation

Situation	Right fix	Note
Gap 3–6 mm, floor is level	Brush strip	The most economical option
Floor is carpet or natural stone	Automatic drop-down seal	No dragging
Gap over 10 mm	Threshold profile + strip	A strip alone isn't enough
Draft also comes from the sides	Renew the frame/leaf seal	Seals don't last forever
Leaf has warped	Hinge adjustment or leaf replacement	Needs a site survey

Is it a draft, or is it condensation?

Both feel the same — a chill near the door — but the causes and fixes are completely different. There's a simple way to tell them apart: on a windy day, run a thin tissue around the door gap. If the tissue moves, you have an air leak, and the fix is the seal and strip options covered in this article.

If the tissue doesn't move at all, but the inner face of the door feels ice-cold to the touch, the situation is different: that's a sign of a thermal bridge. A steel leaf without a broken thermal bridge carries outdoor cold straight through the metal to the inner surface. As that surface temperature drops, indoor humidity condenses on it — sometimes appearing as water droplets on the inner face of the leaf, or as frost in a hard winter.

In this second case, replacing the seal or fitting a strip won't fix anything, because there's no air actually leaking. The fix is a leaf with a broken thermal bridge — in other words, the door itself. If you're staying with your current door, adding an insulated panel to the inside face gives a partial improvement.

Frequently Asked Questions

How big should the gap under the door be?

3–5 mm between the finished floor and the bottom of the leaf is enough. Any less and the door drags; any more and you get a direct air leak.

Does a brush strip really work?

It makes a noticeable difference for gaps up to about 6 mm. For larger gaps it isn't enough on its own and needs to be paired with a threshold profile.

When should the seal be replaced?

Replace it if it doesn't spring back when you press it, or if it's hardened or torn in places. On an exterior door, a seal typically lasts a few years, depending on use and sun exposure.

Not sure what's causing it?

Sometimes you can't figure out where a leak is coming from just by looking. Call 0532 689 21 46 or send a photo of the bottom of the door — we'll tell you which fix you need.