A draughty window allows unwanted air to pass through gaps around the frame, damaged seals or a window that is not closing correctly. The problem can affect comfort, noise levels and the overall performance of the window.
Before replacing the complete window, it is worth finding the exact source of the draught. You can fix many common window faults by replacing a seal, adjusting the mechanism, repairing the hardware, or sealing a gap around the frame.
How to Find Where the Draught Is Coming From
The first step is to identify exactly where the air is entering. Close the window fully and check:
- Around the edges of the opening window
- Along the rubber seals
- Around the corners of the frame
- Around the handle and locking points
- Around the hinges
- Between the window frame and surrounding wall
Move your hand slowly around the closed window to check for air movement. You can also inspect the seals and frame visually for cracks, gaps or damaged sections.
Finding the entry point helps you choose the correct repair instead of applying a temporary fix.
Check the Window Seals
Worn or damaged window seals are a common cause of draughts.
Inspect the seals for:
- Cracks
- Splits
- Gaps
- Flattened sections
- Loose areas
- Brittle rubber
- Missing sections
The seal should sit firmly against the frame when the window is closed. If it has become damaged or compressed, air can pass through the gap.
How to fix it: Replace the damaged seal with the correct profile for your window. The new seal should fit evenly around the frame without being stretched or left loose.
Adjust a Window That Is Not Closing Properly
A window can become misaligned over time. When this happens, the sash may not sit correctly against the frame and seals.
Signs can include:
- The window feels loose when closed
- One side has a larger gap than the other
- The sash catches against the frame
- The handle is difficult to turn
- The locking points do not engage correctly
How to fix it: The hinges, keeps or locking mechanism may need adjustment so the window closes evenly against the seals.
Avoid forcing the handle because this can damage the internal mechanism.
Replace a Damaged Window Seal
If a window seal is cracked, worn or compressed, replacing it is usually more effective than trying to repair the damaged section.
The old seal should be removed carefully before cleaning the channel and fitting the correct replacement. The new seal should sit evenly around the window without stretching.
If you are unsure which seal your window requires, a window repair professional can identify the correct type.
Repair Gaps Around the Window Frame
Not every draught comes through the opening section of the window. Air can also enter through gaps around the frame.
Inspect the sealant around the frame for:
- Cracks
- Shrinkage
- Separation
- Missing sections
- Visible gaps
Small gaps may be repaired using suitable exterior-grade sealant.
However, a large gap or movement around the frame may indicate a deeper problem. Adding more sealant may only provide a temporary solution if the frame itself has moved or become damaged.
Check the Window Handle and Lock
A faulty handle or locking mechanism can prevent the window from closing tightly.
If the handle turns without pulling the window firmly against the frame, the locking mechanism may need adjustment or repair.
A properly working locking system helps keep the window securely closed and maintains contact between the window and its seals.
Check for Draughts Around the Glass
If you cannot find the source around the opening section or frame, inspect the glazing.
With double glazed windows, condensation or misting between the panes can indicate a failed sealed unit.
In this situation, the glass unit may need to be replaced. Depending on the condition of the frame, it may be possible to replace the sealed unit without replacing the complete window.
If the glass itself is not causing the problem, check the seals, frame and window mechanism.
Can You Fix a Draughty Window Yourself?
Some common draught problems can be suitable for DIY repair.
For example, you may be able to replace an accessible window seal or repair a small gap in the external sealant.
More complicated faults involving:
- Window alignment
- Hinges
- Locking mechanisms
- Internal hardware
- Double glazed units
- Damaged frames
may require professional window repair.
The important thing is to identify the cause before attempting a repair. Covering the visible gap without fixing the underlying fault may not solve the problem.
What Is the Best Way to Fix a Draughty Window?
The best repair depends on the source of the draught.
- Damaged seal: Replace the window seal.
- Window not closing correctly: Adjust the window mechanism.
- Faulty handle or lock: Repair or replace the hardware.
- Gap around the frame: Inspect and reseal the affected area.
- Failed glazing: Replace the sealed glass unit where appropriate.
Fixing the specific fault is generally more effective than using temporary draught-proofing materials over the problem.
When Should You Get a Draughty Window Repaired?
If you cannot identify the source of the draught or a basic repair has not resolved the problem, a professional window inspection can help. Professional repair may be appropriate if the window:
- Will not close correctly
- Has damaged seals
- Has faulty hinges
- Has a broken handle or lock
- Has movement around the frame
- Remains draughty after sealing
- Has misted double glazing
A draughty window does not automatically require complete replacement. If the frame and main structure remain in good condition, repairing the faulty component may be enough.
FAQs
How do I fix a draughty window?
First identify where the draught is coming from. Check the seals, frame, hinges, handle and locking mechanism. Replace damaged seals, repair gaps or adjust the window hardware according to the fault.
Why is my window letting air in?
Common causes include worn seals, gaps around the frame, poor alignment, damaged hinges and faulty locking mechanisms.
Can I fix a draughty window without replacing it?
Yes. Many draughty windows can be repaired by replacing seals, adjusting the window mechanism or repairing the handles, hinges or locking points.
How do I stop a draught coming through a window seal?
If the existing seal is cracked, loose or compressed, replacing it with the correct window seal can restore the seal between the window and frame.
Can draughty uPVC windows be repaired?
Yes. uPVC windows can often be repaired by replacing seals, adjusting the mechanism or repairing faulty hinges, handles and locking points.
Why is my window still draughty after replacing the seal?
The draught may be coming from another area, such as the frame, locking mechanism, hinges or the gap between the frame and surrounding wall. The complete window should be checked to identify the actual entry point.
Should I use sealant to fix a draughty window?
Sealant can help with small gaps around the window frame, but it will not fix problems caused by damaged seals, poor alignment or faulty window hardware.
How do I know if my draughty window needs repair or replacement?
If the frame is in good condition, a repair may be enough. Problems with seals, hinges, handles, locks and alignment can often be repaired without replacing the complete window.
