Sorting draughty windows in Cardiff and CF10
If you're dealing with draughty windows in Cardiff, the first job is separating the symptom from the cause — and that's genuinely worth doing before anyone quotes you. Traffic noise on the A48 ring is the local condition that most often pushes this fault along, particularly on exposed elevations around Cyncoed and Llanishen.
What you'll notice first
- a curtain that lifts slightly on a windy night with the window shut
- a cold ribbon of air along the sill or down one jamb
- whistling from a specific corner when the wind sits on that elevation
- the room never quite holding heat despite the radiator running
Stopping it coming back
- silicone spray on the gaskets once a year keeps them supple instead of chalky
- oil the hinges and locking mechanism so the sash keeps pulling in square
- don't paint over the gasket — paint stiffens it and it stops sealing
Your realistic options
New EPDM gasket run into the existing channel and fresh external mastic to the reveal. Cheapest fix and often the only one needed.
Friction stays replaced or re-shimmed, keeps moved so the cam pulls the sash squarely onto the seal all the way round.
The right call when the profile is thin-walled 1990s uPVC, corner welds have opened, or the frame itself has bowed — at that point no amount of sealing restores compression.
We'd rather adjust than sell. If a sash can be pulled back onto its seal with new gaskets and a hinge tweak, that's a short visit and a small bill. Replacement earns its place when the frame has lost its geometry, when single glazing is still in place, or when you're solving heat loss across a whole elevation rather than one opening.
What actually causes it
- 1the rubber gasket has gone hard and flat, so the sash no longer compresses onto it
- 2hinges have sagged and the sash is closing tight at the top and loose at the bottom
- 3the keeps are worn so the lock pulls the sash in less than it used to
- 4the external mastic between frame and brick has shrunk and cracked away
- 5trickle vents left permanently open and mistaken for a draught
What we check on survey
- we run a hand round the closed sash on a windy day rather than guessing from the inside
- paper test on the seal line: if a sheet pulls out freely with the window locked, compression has gone
- we check whether the draught is actually the trickle vent doing its job
- we look at the external mastic joint, which fails long before most people notice
How it's priced
Gasket and adjustment work is charged as a short visit. Replacement is priced per opening by size and configuration — a small fixed light is a fraction of a three-part bay. We price both routes on the same quote so you can see the gap.
How urgent is it? Worth acting on before winter. Draughts cost you continuously through the heating season, and a sagging sash left uncorrected wears the hinges and keeps faster.
What we typically find on survey
- The escutcheon on the front door is loose and rotates as the key turns.
- The old timber back door has a live rot pocket at the bottom hinge that reads soft to a screwdriver tip.
- The internal locking cams on the multipoint have been ground down by a mismatched keep pattern.
- The friction hinge on a bedroom window has one detent — it either opens fully or slams shut on any breeze.
- The multipoint deadbolt still throws but the top hook has stopped catching and no one has noticed for months.
- The internal beadwork has been painted so many times the mitres are unrecognisable.
How we actually carry out the work
- The perimeter tape between frame and reveal is a compressible foam tape, not a plain butyl strip.
- The old frame's fixing holes in the brick are filled and made good before the new outer frame beads up to the reveal.
- The old frame comes out in one piece where possible so the reveal detail is not chased through with a demolition bar.
- The client is left with the manufacturer's paperwork in a labelled envelope, not a folded receipt tucked inside a drawer.
- The install date is stamped inside the frame chamber for future reference — a decade later a client can still date it.
- The client's Wi-Fi router near the door is checked for a signal drop after the composite slab is fitted — a rare case, but worth confirming.
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
Draughty Windows — questions we get asked
Will new windows definitely stop the draught?
Only if the frame is the cause. If the draught is coming from the plaster reveal, an unsealed lintel or a gap behind the sill, new windows fitted to the same opening can leave it exactly as it was — which is why we check the reveal before quoting.
Is draught-proofing tape a real fix?
It's a stopgap. Self-adhesive foam compresses permanently within a season and gums up the gasket channel. A proper replacement gasket costs little more and lasts years.
Should I block the trickle vents?
No. They're there to manage moisture, and closing them permanently is the fastest way to create condensation and mould on the reveals.
Do you cover draughty windows 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.
How quickly can someone look at it in Cardiff?
We run the A48 corridor regularly, so a survey in Cardiff is usually available within the week and the written quote follows within 24 hours of the visit.
If replacement is the answer
10-year product guarantee, 2-year fit warranty, lifetime hardware servicing
10-year product, 2-year fitting, lifetime hardware servicing
10-year sealed unit guarantee, 10-year frame, 2-year fitting
10-year product on every frame, 2-year fitting on the whole package, single point of contact
Other faults we see in Cardiff
Yellowing is cosmetic and treatable; splits at the welded corners are structural and aren't.
ReadA composite slab that catches on the frame has almost always moved at the hinges, and hinges are adjustable in three planes.
ReadWhich face the water sits on tells you everything: inside is ventilation, between the panes is a failed unit, outside is normal physics.
ReadFull background on draughty windows
The main guide covers the mechanics of this fault in more depth, without the Cardiff context.
Read the Draughty Windows guide →Let's make your house feel more like home.
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