How to Stop Window Draughts and Keep Heat In

A cold line of air around a window can make an otherwise warm room feel uncomfortable, particularly on damp Greater Manchester evenings. Knowing how to stop window draughts starts with finding where the air is actually getting in. The answer may be as simple as adjusting a handle or renewing a seal, but it can also point to ageing glazing or a window that no longer fits its opening as it should.

Before buying draught-proofing tape, take a few minutes to inspect the window carefully. A temporary fix can improve comfort, but the right long-term solution depends on whether the problem is with the frame, the opening sash, the glass unit or the surrounding brickwork.

Find out where the draught is coming from

On a still day, run the back of your hand slowly around the inside edge of the window frame, including the opening section, the hinges and the sill. You may feel a clear cold current in one area, or simply notice that one part of the room is consistently colder. A thin piece of tissue held near the suspected gap can also show movement.

Do this with the window shut and locked. If the draught reduces when you push the sash against the frame, the seals may be flattened, worn or sitting too far away from the frame. If air is coming from the frame itself, the issue could be failed external sealant, gaps around the installation or damaged trim.

It is worth distinguishing a draught from cold glass. Single glazing and older double glazing can feel very cold without allowing outside air directly into the room. In that case, better glazing rather than a new seal may make the biggest difference to comfort and heating costs.

Start with the simple window draught fixes

Small adjustments and basic maintenance are sensible first steps where the window is otherwise sound. Clean the frame and seals with warm, soapy water, then dry them thoroughly. Dirt, paint residue and trapped grit can stop a window from closing tightly.

Check that the handle locks properly. On many uPVC casement windows, the locking points pull the opening sash firmly against the rubber gasket. A loose handle, worn mechanism or misaligned sash can prevent that pressure from being applied evenly. If a window needs force to lock or the handle feels stiff, avoid repeatedly forcing it. That can damage the mechanism further.

For an obvious, narrow gap around a non-opening section, self-adhesive draught-proofing strips can offer a short-term improvement. Choose a product designed for windows, keep it away from drainage channels, and do not use so much that the sash cannot close or lock. Foam strips are inexpensive, but they tend to compress and wear quickly. Rubber or silicone seals generally last longer where they are properly fitted.

Curtains and thermal blinds can reduce the feeling of cold near glass, especially overnight, but they do not repair a leak. Keep them clear of radiators where possible so warm air can circulate into the room rather than being trapped behind the fabric.

Replace worn seals rather than covering the gap

Window gaskets are designed to create an airtight seal between the sash and frame. Over time, they can become flattened, brittle, torn or detached at the corners. This is common on older uPVC windows exposed to years of sunlight, rain and everyday use.

Replacement seals can be effective, but they are not one-size-fits-all. The profile must match the groove in the frame and provide the correct compression once the window is closed. Fitting an unsuitable gasket may leave the window harder to operate without stopping the draught.

If the seals look perished but the frames are in good condition, a professional repair may be a cost-effective option. An experienced installer can identify the correct gasket, assess the hinges and locking points at the same time, and make sure the sash closes squarely. This is particularly valuable on upper-floor windows or larger opening lights, where safe access and alignment matter.

Check hinges, locks and window alignment

A window that has dropped slightly on its hinges may look closed while leaving a gap at the top or hinge side. Composite or timber windows can also move subtly with seasonal changes in temperature and moisture. With uPVC windows, worn friction hinges are a common cause of poor closure.

Signs of alignment trouble include uneven gaps around the sash, difficulty locking the handle, scraping against the frame, or a draught concentrated at one corner. Adjustment may resolve the issue, although severely worn hinges or damaged locking hardware will need replacement. This is not a job to guess at with a screwdriver, as incorrect adjustment can make the window less secure or place strain on the glass unit.

Look beyond the opening sash

Not every draught is caused by the window itself. Cracked sealant around the outside of the frame can let cold air and moisture through the gap between the frame and the wall. Inside, gaps behind trim or around the window board can have a similar effect.

External sealant should be checked from a safe position. It needs to be continuous, well bonded and free from deep cracks or separation. A neat bead of new sealant can help where the frame is otherwise stable, but it will not correct a poorly fitted window or a gap caused by movement in the surrounding structure.

Pay attention to ventilation too. Modern windows may include trickle vents, which are designed to provide controlled background ventilation. They should not create a strong, uncontrollable draught when correctly fitted, but they do allow some airflow by design. Do not block them permanently, particularly in kitchens, bathrooms or rooms prone to condensation. It is better to ask for advice on whether the vent is operating correctly and whether another issue is making the room feel cold.

When failed double glazing is part of the problem

Misting or moisture between panes means the sealed unit has failed. This does not always cause a noticeable draught, but it reduces the glass unit's insulating performance and can leave the inner pane much colder. You may also see cloudy patches, water marks inside the unit or a persistent chill around the glass.

In many cases, the full frame does not need replacing. A like-for-like replacement double-glazed unit can restore clarity and thermal performance if the existing frame, sash and hardware remain in good condition. It is important that the replacement is measured accurately and specified with suitable energy-efficient glass for the room.

That said, replacing only the glass will not solve gaps caused by warped frames, tired hinges, damaged seals or an outdated locking system. A proper assessment should separate what can sensibly be repaired from what is nearing the end of its serviceable life.

How to stop window draughts for good

If you have renewed seals, checked the mechanisms and repaired obvious gaps but the room still feels cold, it may be time to consider replacement windows. Older units can lose performance gradually, so homeowners often adapt to the discomfort without realising how much heat is being lost.

Modern double glazing, and triple glazing in the right property, can offer a noticeably warmer internal surface, tighter weather seals and improved acoustic performance. The best choice depends on the window size, the property's construction, the room's orientation and your budget. Triple glazing is not automatically necessary for every home, while a high-quality, well-installed double-glazed window can be an excellent upgrade from ageing units.

Installation quality is just as important as the product. Even an energy-efficient window will disappoint if it is incorrectly measured, poorly sealed or left out of alignment. For homeowners in Whitefield and across Greater Manchester, Whitefield Windows provides honest advice on whether a repair, replacement glass unit or full window upgrade is the sensible route, with transparent quotations and no hidden costs.

Do not ignore security or water ingress

A draught alongside a loose handle, failed lock or window that will not shut properly deserves prompt attention. Apart from heat loss, it can affect home security and allow rainwater to reach areas it should not. Staining around the reveal, peeling paint, swollen timber or mould near the frame are all reasons to arrange an inspection rather than simply adding more draught strips.

A warmer home should not come at the expense of ventilation or safe operation. The most effective repair is one that leaves the window secure, easy to use and properly sealed against the weather.

If a room remains cold after the straightforward checks, treat that as useful information rather than a nuisance to hide. A careful assessment of the seals, glazing and installation can identify the cause and help you choose a repair that keeps the heat where it belongs.