Cardiff sticking French doors: what it means and what it costs
Sticking French doors behaves slightly differently here than it does on newer estates. Edwardian and Victorian bay-fronted houses in Cathays and Roath, 1930s semis in Llanishen, modern builds in Pontprennau means deeper reveals and older fixings, so what looks like a serious fault often turns out to be adjustment. We cover CF10 and CF11 and CF14 and CF23 and CF24 and CF5 on a regular run via A48, so a diagnostic visit rarely sits in the diary long.
What actually causes it
- 1the master leaf dropping on its hinges and closing the middle gap
- 2the slave leaf shoot bolt sockets clogged or out of alignment
- 3the frame flexing because the head has no packing above it
- 4seasonal expansion on a sun-facing pair with dark foiled frames
Why this comes up in Cardiff
- Council
- Cardiff
- Postcodes
- CF10, CF11, CF14, CF23, CF24, CF5
- Main route
- A48
- Nearest town
- Penarth (4 mi)
Around Cyncoed, Llanishen, Roath the recurring local factors are heritage-friendly frame profiles in conservation streets; traffic noise on the A48 ring; single-glazed bays losing heat in tall Victorian rooms. Commercial neighbours such as Cardiff Bay, Capital Business Park and the Llanishen industrial belt change the exposure again on the elevations that face them, and the Cardiff Council area sets the standards any replacement work is signed off against.
- Cyncoed
- Llanishen
- Roath
- Cathays
- Penylan
- Whitchurch
- Pontprennau
- Rhiwbina
- Heath
- Grangetown
- Splott
- Canton
- Llandaff
- Radyr
- Gabalfa
- Ely
- Adamsdown
What we check on survey
- we check the gap down the meeting stile top to bottom before touching anything
- we test each shoot bolt individually with the other leaf open
- we look for deflection in the frame head, which is the fault that keeps returning
- we confirm the threshold is still level across the opening
How it's priced
Realignment is a single short visit. Keeps and gaskets add a small parts cost. A replacement pair is priced by overall width, glazing spec and whether a threshold change is needed.
How urgent is it? Fairly prompt. If the shoot bolts aren't engaging, only the master leaf lock is holding the pair shut, and that's not adequate security on a rear elevation.
Your realistic options
Both leaves reset at the hinges, shoot bolt sockets cleaned and repositioned, then the pair set so the meeting stiles close parallel.
New keeps and a fresh gasket run restore compression, which stops the draught that usually arrives alongside the sticking.
Where the frame has bowed in a wide opening or the leaves have distorted, a new set — with the head properly packed this time — is the durable answer.
French doors are very often adjustable back to perfect. The exception is a wide opening where the frame head has deflected, because that pushes the leaves out of parallel every time you correct them and it will keep coming back until the structure above is dealt with.
What we typically find on survey
- The letterplate has a hinged internal flap that has snapped off and is currently held in place with masking tape.
- The sealed unit is a 20mm gap, not the modern 28mm minimum, so U-values are into the mid-2s at best.
- The old timber back door has a live rot pocket at the bottom hinge that reads soft to a screwdriver tip.
- The mid-rail on the composite door is bowed outward at the middle by 2mm — a slab-warp symptom.
- One kitchen unit has a defrost trace across the low-e coating — the argon fill has been gone a while.
- The trickle-vent screw covers are missing and the internal chamber has filled with cobweb.
How we actually carry out the work
- The install team pull the fridge out for kitchen-window swaps only after checking the flooring can take the drag scuff.
- The crew takes the old glass off site in a labelled sack that day, not a skip left on the drive.
- The threshold ramp on an accessible door is set to a maximum 15mm rise and confirmed with a spirit-level lip.
- The client's paint colour on the internal reveal is patched with matching paint the crew brings, not left for someone else.
- Fixings are always at the reinforcement points — a screw through the chamber alone loosens within a year.
- Any dropped hinges on the existing door are noted before the swap so the new frame is set for the correct drop.
What you'll notice first
- the two leaves catch on each other in the middle as they close
- the slave leaf shoot bolts no longer drop into their sockets
- a visible taper in the gap down the meeting stile
- one leaf closing fine while the other needs a firm pull
Stopping it coming back
- always drop the slave leaf bolts before locking — leaving them up loads the meeting stile
- oil the shoot bolts and hinges twice a year
- don't let the doors swing in the wind; a gust into an open leaf is what bends a hinge
French Doors That Stick Or Won't Shut — questions we get asked
Why do my French doors only stick in summer?
Dark frames on a sunny elevation expand. If the pair was set with minimal clearance, they'll bind at the hottest point of the year and free up again in autumn.
The slave door bolts won't drop — what's wrong?
Usually the socket has filled with debris or the leaf has moved a few millimetres. Both are adjustment jobs, not replacement jobs.
Can French doors be adjusted or do I need new ones?
Adjusted, in most cases. Replacement is honest advice only where the frame or the leaves have physically distorted.
Is sticking French doors more common on Cardiff properties?
It's shaped by the local stock. With Edwardian and Victorian bay-fronted houses in Cathays and Roath, 1930s semis in Llanishen, modern builds in Pontprennau, plus heritage-friendly frame profiles in conservation streets and traffic noise on the A48 ring and single-glazed bays losing heat in tall Victorian rooms, the components involved in this fault tend to age faster here than on sheltered inland new-builds.
Do you cover sticking French doors across the whole of Cardiff?
Yes — CF10, CF11, CF14, CF23, CF24, CF5 and the surrounding villages, including Cyncoed, Llanishen, Roath, Cathays. 10 miles from base, A470 the whole way — Cardiff installs run as smoothly as our home patch.
If replacement is the answer
Other faults we see in Cardiff
Most break-ins through glazed openings exploit the cylinder or the keeps, both of which are upgradeable in an afternoon.
ReadWhich face the water sits on tells you everything: inside is ventilation, between the panes is a failed unit, outside is normal physics.
ReadMost of the heat leaves through the roof and the frames, so that's where the money should go first.
ReadFull background on sticking French doors
The main guide covers the mechanics of this fault in more depth, without the Cardiff context.
Read the French Doors That Stick Or Won't Shut guide →Let's make your house feel more like home.
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