Why Exterior Doors Stick and What to Do Next

A front or back door that suddenly needs a shoulder to close is more than an everyday annoyance. It can affect security, let in draughts and put unnecessary strain on the lock. Understanding why exterior doors stick helps you respond sensibly - whether the answer is a simple seasonal adjustment or a closer inspection of the frame and installation.

The first clue is usually where and when the door catches. A timber door that sticks along its edge after several wet days has a different cause from a composite or PVCu door that catches at one top corner all year round. Forcing it closed may make the immediate problem worse, particularly if the lock or hinges are already under pressure.

Why exterior doors stick in different weather

Exterior doors live with the British weather every day. Changes in moisture and temperature cause building materials to move, although the amount of movement varies considerably by material.

Timber absorbs moisture

Timber is naturally responsive to humidity. During damp autumn and winter weather, it can take in moisture and swell slightly. That may be enough to make a previously smooth-fitting door rub against the frame, threshold or weather seals.

A painted or varnished timber door should be protected on every edge, including the top and bottom. Where the finish has worn away, water can enter more easily. If the door only sticks during wet spells and eases when conditions dry, moisture movement is a likely explanation.

That does not always mean the door needs replacing. It may need its finish renewed, minor easing by a professional, or improved protection from persistent rain. However, repeated swelling can point to poor drainage, damaged seals or timber deterioration that deserves attention.

Heat can affect doors and frames too

Strong sunlight can heat a dark-coloured door substantially, particularly on a south-facing elevation. Composite doors, PVCu doors and their frames expand only slightly, but on a very hot day that movement can make a close-fitting door feel stiff. The effect should normally be temporary.

If a door is difficult to close in every season, it is unlikely to be simply summer expansion. The hinges, keeps or frame alignment may need checking instead.

Hinge movement is a common cause

A door can stick because it has dropped very slightly on its hinges. This is common with older or heavier doors, but it can also happen when a door has settled after installation. You may notice that the top corner on the handle side catches the frame, or that the gap around the door is uneven.

Loose screws in timber frames, worn hinge components, or hinges that need adjustment can all contribute. Modern composite and PVCu doors often use adjustable hinges, allowing a qualified installer to realign the door without cutting or planing it.

It is tempting to tighten every visible screw or alter hinge settings at random. That can create a new alignment problem, particularly on doors with multi-point locking. If you can see an obvious loose screw, tightening it gently may help, but avoid over-tightening or making several adjustments at once. A professional can assess the door's weight, hinge condition and clearances before making a precise correction.

The frame, threshold and locks may be out of line

Not every sticking door is actually rubbing. Sometimes the door closes into the frame but the handle is hard to lift or the key is difficult to turn. In that case, the locking points may not be lining up cleanly with the keeps in the frame.

This can happen when a door has dropped, but it may also result from minor movement in the building, changes around the threshold, or a frame that was not correctly packed and fixed during installation. On PVCu and composite doors, the glazing panels can also influence how the sash sits. A specialist may need to adjust or re-pack the glass to restore the correct position.

The threshold deserves a look as well. Dirt, grit, leaves and small stones can build up in the bottom track or around drainage channels. This is especially common on rear or patio access doors. Carefully clear loose debris with a soft brush and check that drainage openings are not blocked. Do not use harsh chemicals or sharp tools that could damage seals, finishes or drainage paths.

New exterior doors can need a settling check

A new made-to-measure door should open, close and lock comfortably from the day it is installed. It should not require force. Even so, a follow-up adjustment can occasionally be needed after the property and door have experienced changing temperatures and day-to-day use.

This is one reason careful surveying and installation matter. A door system is not just the door slab: it includes the frame, hinges, glass, seals, threshold, locking mechanism and the condition of the opening itself. Small inaccuracies in any of these areas can affect long-term operation.

If a recently fitted door becomes stiff, contact the installer promptly rather than trying to reshape it yourself. Reputable installers should be able to establish whether it needs a straightforward adjustment or whether another issue is present. For homeowners choosing a replacement door in SW London or Surrey, workmanship cover and responsive aftercare offer useful reassurance long after fitting day.

Signs that suggest a more serious issue

A sticking door is often a manageable maintenance matter, but a few warning signs call for a fuller inspection. Look beyond the door itself if the problem has appeared suddenly or worsened quickly.

• New cracks in nearby plaster, brickwork or render may indicate movement around the opening.

• A visibly bowed frame, gaps between frame and wall, or failed sealant can allow water and draughts to enter.

• Soft, discoloured timber around the frame can suggest rot caused by ongoing moisture exposure.

• A lock that jams, spins or will not secure properly is a security concern and should not be ignored.

• A door that needs significant force to lock may damage the mechanism if used repeatedly.

These symptoms do not automatically mean there is a major structural problem. Properties settle over time, and localised moisture damage is common in older homes. Still, it is better to identify the cause before making cosmetic repairs or replacing only one component.

What you can safely check at home

Start by observing the door rather than forcing it. Open it fully and look at the gap between the door and frame. Is it narrower at one corner? Does it rub at the top, bottom or along the hinge side? Try operating it at different times of day and after wet or hot weather, as this can reveal a seasonal pattern.

Keep hinges and moving lock parts clean, using a suitable light lubricant where the manufacturer permits it. Wipe down the threshold and make sure drainage channels are clear. Check weather seals for tears, flattening or sections that have come loose, because damaged seals can create resistance and reduce draught protection.

Avoid planing, sanding or cutting a PVCu or composite door. These doors are engineered systems, and altering the slab can affect the finish, weather performance, warranty and fit. Likewise, do not force a stiff multi-point lock by lifting the handle aggressively. Continued pressure can turn a simple alignment adjustment into a lock repair.

When to call a door specialist

Professional help is worthwhile when the door catches consistently, the lock is difficult to operate, the frame looks uneven, or there are signs of water damage. It is particularly sensible for composite and PVCu doors, where accurate hinge, keep and glazing adjustments make a real difference to security and weather resistance.

A competent specialist will inspect the hinges, frame fixings, threshold, seals and locking alignment before recommending work. The right solution might be a minor adjustment, replacement hinges or seals, a lock repair, frame remedial work, or, where a door has reached the end of its useful life, a replacement designed for the opening.

A door should feel solid and reassuring, not like something you have to wrestle with each time you leave the house. Acting early protects the lock, preserves the door's weather performance and gives you the confidence that your home remains secure.