You’ve shut them properly. You’ve even checked the handle clicks into place. And yet, somehow, there’s still a thin ribbon of cold air creeping across the floor every time the temperature drops outside. It’s one of the most common complaints homeowners raise about older doors, and it catches out even people who are otherwise fairly handy around the house.
The honest answer is that a door can look completely closed and still be letting draughts through. Timber moves with the seasons, swelling slightly in damp weather and shrinking a little when it’s dry, which changes how tightly the door sits against its frame throughout the year. Joinery specialists who work with French doors daily see this pattern constantly, particularly in homes where the original doors have been in place for decades.
Where the Draught Is Actually Coming From
There are a handful of usual suspects behind this problem, and most of them have nothing to do with the door being faulty in any dramatic sense.
None of these issues mean the door has failed. They’re simply signs of age and use, and in most cases, they’re straightforward to put right.
The Threshold Detail Most People Overlook
Of everything on this list, the threshold is the part that catches people out most often. It’s a small strip of material, but it does a lot of work, forming the seal between the bottom of the door and the floor. If it’s worn, poorly fitted, or was never quite right to begin with, cold air will find its way in no matter how well the rest of the door closes.
A well-fitted threshold should sit snugly against the door with no visible daylight showing through when it’s shut. If you can see light, or feel a draught along the floor specifically rather than around the edges, that’s usually where to start looking.
Simple Fixes Versus Bigger Jobs
Some of this is genuinely easy to sort out. Replacing worn weatherstripping is a relatively small job and can make a noticeable difference within a day. Adjusting hinges to correct a sagging door is also fairly quick work for someone who knows what they’re doing.
Warped panels and a poorly fitted threshold are a different matter. These usually point to a wider issue with how the door was originally installed, or simply that the timber has reached the end of what sealing and adjustment alone can fix. At that point, it’s worth having a proper look from someone who builds and fits doors for a living, rather than continuing to patch the same problem every winter.
Why Good Installation Matters More Than People Expect
A door is only ever as good as the frame it sits in and the precision of the fit. This is where experience genuinely shows. Todi & Boys has spent decades designing, building and fitting timber doors and windows from their own workshop and handles every stage of the process, from the initial survey through to final fitting, with the same in-house team. That continuity matters, because a door that’s measured, built and hung by people working to the same standard throughout is far less likely to develop draught problems down the line.
Their doors are also fitted with proper heat and sound insulation as standard, alongside quality locking hardware, which helps explain why homeowners across London, from Victorian terraces to more contemporary homes, keep coming back to them for door and window work.
What This Means for Your Home
If you’re feeling a draught through doors that look perfectly closed, don’t assume you need a full replacement straight away. Start with an honest look at the weatherstripping, the threshold, and whether the door still sits flush against its frame at every point. A quick check with a piece of paper, closing the door on it and seeing how easily it slides out, can actually tell you a lot about where the seal has weakened.
If the problem keeps returning no matter what you try, that’s usually a sign the door itself, or its original fitting, has reached its limit. Getting a proper assessment before winter sets in properly will save you from another season of cold feet and rising heating bills, and it’s a far better use of your time than layering rugs against a draught that a small repair could solve outright.
Why the Frame Matters as Much as the Door
Homeowners often focus entirely on the door itself and forget that the surrounding frame plays just as big a part in keeping draughts out. If the frame has moved slightly over the years, perhaps due to settlement in the wall around it or simply age, the door can be perfectly built and still fail to seal properly against it. This is particularly common in older properties where the surrounding brickwork has shifted a little over decades, changing the shape of the opening ever so slightly.
A joiner assessing a draughty door should always check the frame alongside the door itself, rather than assuming the door is automatically to blame. Sometimes the fix isn’t a new door at all, but adjustments to the frame it sits within, which is a much smaller and less costly job.
Getting a Second Opinion
If you’ve already tried the obvious fixes and the draught persists, it’s worth getting an honest assessment from someone who fits doors regularly rather than continuing to guess. A good joiner can usually identify the exact point of failure within a short visit, simply by running a hand around the edges while the door is closed and checking where the air is actually coming from.
French doors, when properly built and fitted, shouldn’t let in noticeable draughts even during the coldest months. If yours consistently do, despite looking fine from the outside, that’s a clear signal something in the build or the fitting needs proper attention rather than another temporary patch.
