Replacing French doors: how to know when the time is right

Simon Edward • 5 May 2025

Got cracks or draughts? Learn the top telltale signs that it's time to replace those old French doors.



Got cracks or draughts? Learn the top telltale signs that it's time to replace those old French doors.

French doors are a beautiful addition to any home. They flood your room with natural light, opening up rooms and introducing seamless access to your outside space.


But like many home improvements, French doors can start to look a little worse for wear after years of enjoyment. How do you know when the time is right to change them?


Here are some telltale signs that your French doors might need replacing.


Visible damage


Visible deterioration or damage is a sure sign your French doors have seen better days. 


Any cracks or chips in the glass, no matter how small, can seriously affect the integrity and safety of the door. Splits or fractures in the frame, meanwhile, could be a sign of warping or water damage.


Either problem is a strong signal that your doors need replacing – and fast.


Trouble with opening or closing


French doors that stick or scrape can sometimes be fixed by tightening the hinges. But if you have persistent difficulty opening or closing them, it may be a sign of a bigger problem. 


Water damage from impaired seals or prolonged exposure to extreme temperatures and weather conditions can cause French doors to warp or bow. 


Door warping is notoriously difficult to fix. It might be better to replace the doors with a fresh new set.


In any case, it's important to resolve the problem as soon as possible. If your French doors don't open and close properly, it's not just annoying – it can also lead to other, more serious issues, such as damp. 


Difficulty with the handle or lock


Door locks and handles should be built to withstand regular use. A stiff handle or a lock that jams may mean the mechanics of your door are on the wane.


Picture of a handle on a French door.

Sometimes, this can be a fairly simple fix – like replacing the lock. However, if the damage is due to rust from leaking seals or a "drop" in the frame, more serious intervention is needed. It might be time to look at replacing the whole unit.


Condensation or foggy glass


Have you noticed condensation buildup or a foggy appearance in the glass? It could be a sign of glazing failure.

This can happen for a number of reasons, including:

  • Seal deterioration
  • Poor installation
  • Thermal stress
  • Excessive force on the door


Not only is it unsightly, but failed glazing can also lead to excess moisture buildup, poorer insulation and increased noise pollution in your home.


Draughts


Draughty doors can be bad news. For your home, it can mean cold rooms, chilly floors and reduced thermal efficiency.


Draughts can be caused by damage to seals, frames or hinges. They might also occur if an older unit has settled significantly over time.


Effectively sealed and properly installed French doors shouldn't allow for the outside air to seep in. A noticeable draught can be a good giveaway that it might be time to look for something new. 


Signs of damp around the door frame or walls


Sometimes, the signs of a tired French door don't appear on the door itself but show themselves on the walls and furnishings around it.


This is because damaged or deteriorated French doors can allow for water ingress. Dark patches on walls, rotted wood, peeling paint, and mould spots on curtains, walls and ceilings can all signal water ingress.


Insufficient insulation or sealing, leaking frames or structural warping aren't always obvious at first glance. However, it's important to address these problems quickly as they can cause a host of issues that are often harder to address than the door. Often, a new door is the simplest fix.


Picture of a fresh, new French door.

Rising energy bills


Your French doors may not show obvious signs of wear and tear. However, your energy bills will let you know if your home is not insulated effectively.


If you're ramping up the heating in winter or leaving the fans on through summer, it probably means something in your home isn't effectively sealed. The main culprit is likely improperly installed or worn-out windows or doors.


What to do if you've seen the signs


Seeing evidence of any of these problems with your old French doors may mean the time has come to replace them. 


A modern, properly installed and well-insulated French door can save you money on your energy bills while making your home a more comfortable, consistent temperature.


Trust Calder Windows for your next French door installation. Our French doors are not only beautifully crafted but are also secure and built to last. Each comes with a 10-year warranty as standard, plus aftercare when needed for your peace of mind. 


We offer a huge library of styles, colours and panes, plus the option of an integrated state-of-the-art Uniblind. So, why not upgrade your old French doors with something special from Calder Windows?


Fancy something different?


Looking for a change? Want to keep the flood of natural light and open feel you get with French doors? Here at Calder Windows, we've got you covered. 


Our range of inline sliding patio doors and bi-fold doors can do just that while also saving you a little space. They're great for those who want the look of a French door but with a smaller footprint. 


Calder Windows has installed windows and doors in West Yorkshire for more than 30 years. Want to request a free quote? Give our friendly team a call on 01924 897 040 or apply online.


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