Casement Windows on a 1930s semi in Caerphilly
The reason Caerphilly homeowners with a 1930s semi-detached search for casement windows specifically — rather than just "windows" or "doors" — is that spec choice actually matters here. The two-storey bay has been cheaply re-glazed with an under-sized profile that reads visibly wrong is the usual driver. Our route runs CF83 weekly, so a survey rarely sits in the diary more than a week. Stained-glass fanlights above the door can be re-set into a modern composite slab if intact, giving continuity across the swap. Stone walls hold thermal mass but radiate cold at the reveal edge; deep frames pull the cold plane further from the room. Roof canopies are usually mono-pitch and shallow — scaffold clearance rarely exceeds 2.1m above the frame head. 10-year product, 2-year fitting, lifetime hardware servicing. Ex-council reveal openings are generous — swapping to a slimmer profile actually loses daylight, not gains it. Soft verges take van weight for a few hours in dry weather; we stage deliveries around forecast rain. Slate roofs shed water tight to the head of the frame; lead flashing detail is usually original and only needs re-dressing. Original Crittall steel casements can be recycled at scrap — worth calling ahead if the client wants the fee. Original developer composite slabs often warp under southern sun; a replacement 48mm slab with GRP skin resists. Grass verges take skip weight fine when boarded — check with the council before dropping directly onto turf.
Local context — Caerphilly
- Council
- Caerphilly
- Postcodes
- CF83
- Main route
- A468
- Nearest town
- Cardiff (7 mi)
Neighbourhoods we cover: Bedwas, Trethomas, Machen, Energlyn, Llanbradach. Easy in via the A469, and we're 10 minutes from the A470 for vans loaded with full-house glass.
Reveal and install detail
- → External cills are usually concrete — sound, but the drip is often clogged and needs raking out.
- → Cavity walls take a straightforward frame fixing but the internal render is old-school lime, brittle to lever.
Method: old frames cut out cleanly, new casements installed on hardwood packers, restrictor stays fitted at 100mm for child-safety compliance, silicone bead pointed inside and out.
Guarantee: 10-year product, 2-year fitting, lifetime hardware servicing.
Planning & permissions
Not usually protected, though estates with consistent bay-fronts read better when replacements match neighbours in colour and sightline.
Locally in Caerphilly, Caerphilly County Borough Council covers this area. Market town with the castle as the centrepiece — a mix of stone period stock and modern estates. We check any conservation or Article 4 status against the address before quoting rather than after.
Who's asking
Second-time buyers extending or refurbing family homes, and long-time owners finally replacing 90s installs that are now on their second failure.
In Caerphilly specifically that reads as young families upgrading first homes, long-time owners replacing original 90s uPVC. The recurring driver for a casement windows enquiry is: Homeowners looking to fix the bay-window mismatch and warm the property up as one job.
Our casement windows spec for a 1930s semi-detached
Side and rear elevations run standard 70mm casement; the front bay is a separate line item with reinforced posts. Trickle vents to Part F are mandatory on new frames and always caught on 30s replacements. In Caerphilly we see this on the stone-fronted terraces, post-war semis around the castle and newer estates out toward Bedwas around Bedwas, Trethomas, Machen, usually paired with wind-driven rain off the mountain ridge; noise from the A469 corridor; tired 1990s-era double glazing failing at the seals on the same elevation. Easy in via the A469, and we're 10 minutes from the A470 for vans loaded with full-house glass. Council area is Caerphilly County Borough Council in Mid Glamorgan; commercial neighbours include Pontygwindy Industrial Estate and Bedwas House Industrial Estate. Nearby: Cardiff 7mi, Newport 11mi, Pontypridd 10mi. Local vibe: market town with the castle as the centrepiece — a mix of stone period stock and modern estates.
What we typically find on survey
- ·The transom bar has a live crack in the plastic, opened up by summer expansion cycles.
- ·One kitchen unit has a defrost trace across the low-e coating — the argon fill has been gone a while.
- ·A weep vent that was factory-drilled has been over-painted three times and no longer clears water from the chamber.
- ·The friction hinge on one window sticks at 45° open and needs the palm of a hand to nudge past.
- ·The catch keep for the bathroom window has been packed out with a folded matchbox to make the sash lock.
- ·The multipoint deadbolt still throws but the top hook has stopped catching and no one has noticed for months.
- ·There is a live crack running from the top corner of a bay-window pane where the frame has been out of square since installation.
- ·The bay corner post has never had its structural bracket — a common corner-cutting shortcut a decade ago.
- ·The front-door hinge screws are 25mm chipboard fixings, not the manufacturer's 60mm hinge screws.
- ·The garden gate side of the property gets no direct sun and the frames there look ten years newer than the fronts.
- ·The gasket join at the bottom corner has separated by a few millimetres — that's where the draught is coming from.
- ·A previous fitter left the transport wedges in the frame corners and the internal seal never fully reset.
- ·The middle mullion sags visibly across the top rail on any window wider than 1.6m.
- ·The escutcheon on the front door is loose and rotates as the key turns.
- ·A homemade timber threshold has been screwed to the concrete cill in front of the patio door.
- ·The old aluminium sliding door has grit in the track that has worn the roller wheels to elliptical.
- ·A cracked pane has been temporarily patched with clear tape and left for six months.
- ·The internal glazing bead across the top of the bay lifts out completely with fingernail pressure.
- ·The letter plate cover has snapped off and the exposed brush strip has flattened over the years.
- ·The bay-window front elevation has a visible smile — the middle mullion has sagged and taken the head with it.
- ·The georgian bar between the panes has come detached from the top spacer on one unit.
- ·There is no drip groove on the underside of the cill — water tracks straight back onto the brick face.
- ·There is a permanent green algal streak below the sill where water is bypassing the drip groove.
- ·The internal window board has swelled at the sink end from years of splash and is delaminating along the front edge.
Why residents are enquiring right now
- ·The owner wants the property to look less like a rental and more like a home, and the front door does most of that work.
- ·The buyer wants a genuine step-up in security, not a marketing claim — PAS24 tested, not PAS24 marketed.
- ·The buyer wants the frames to still look right in twenty years, not just at handover.
- ·The homeowner wants the composite front door to survive a decade of coastal salt without going chalky.
- ·The owner wants the crew to talk to the neighbour before scaffold goes up on a shared party wall.
- ·The current front door leaks visibly around the letterplate every time the wind swings east.
- ·The resident does not want to be sold to — they want a survey, a written figure, and to be left to decide.
- ·The resident has already lost one composite door to a courier boot and wants the replacement rated for impact.
- ·The owner is done paying to service failing 90s uPVC every couple of years and wants the whole set replaced together.
- ·The buyer is running a small business from the home office and wants the kerb to say established and settled.
- ·The homeowner has finally accepted the timber back door is beyond another repaint and wants the like-for-like replacement design chosen with them.
- ·The buyer wants a specific coloured composite front door because they saw it three doors down and it made the street.
- ·The resident wants the frames to survive a specific paint colour on the render for at least a decade.
- ·The resident wants the crew to be locals who won't disappear if a warranty call needs answering in year eight.
- ·The resident wants the front to look distinct on a street of five identical houses.
- ·The owner is done with the annual condensation season and wants the fabric of the openings to end it.
- ·The buyer is buying the property specifically for the garden and wants a bi-fold that opens the whole rear elevation.
- ·The resident is a keen gardener and wants a patio door that opens as fully as possible into the garden.
- ·The resident wants an installer who will honestly say when a repair beats a replacement.
- ·The homeowner is 68 and wants a threshold that will still be usable in ten years without a step.
- ·The resident has already had one failed installation and wants to know exactly how this one will differ.
- ·A recent break-in on the street has moved security up the priority list ahead of aesthetics.
- ·The homeowner is planning a garden studio and wants the patio doors to bookend the view when it's finished.
- ·The buyer wants a full set of the same colour across every elevation, not the current mixed collection.
How we actually fit it
- ·The finished elevation is photographed from the pavement and uploaded to the office job file as sign-off record.
- ·The client is walked through the operation of every lock, every vent, and every restraint before the crew leaves.
- ·The bay-corner post gets a structural bracket into masonry, not a token fixing into the outer frame.
- ·The threshold ramp on an accessible door is set to a maximum 15mm rise and confirmed with a spirit-level lip.
- ·The install team pull the fridge out for kitchen-window swaps only after checking the flooring can take the drag scuff.
- ·The internal skirting is protected with a strip of packing tape across the top edge before any tool touches it.
- ·New frames sit on hardwood packers, not plastic offcuts — plastic creeps under load, timber does not.
- ·The manufacturer's serial-number label on the new frame is peeled off, not left to yellow on the glass for years.
- ·The multipoint keeps get a smear of grease inside the pocket before the door is closed for the first time.
- ·The old cylinder is disposed of by the crew, not left in a bag on the drive for the client to bin.
- ·The glazing bead is tapped in with a rubber mallet, not a metal claw — the profile marks otherwise.
- ·The fitting van is stocked with the specific spare parts likely to be needed on the day — not a return trip on a missing hinge.
- ·The lock cylinder is measured for internal and external protrusion — a cylinder that stands proud is a snap risk.
- ·The manufacturer's kite mark on the corner of the glass is left in place at handover — proof of spec for the next owner.
- ·The crew calls the client at 5pm the day before to confirm arrival window and site access details.
- ·The old timber cill under a uPVC swap is treated with a boron preservative before the new frame is set over it.
- ·The crew asks the client where the kettle lives before they set up so tea gets made rather than negotiated.
- ·The reveals are photographed on arrival so any pre-existing damage is on record before the crew touches them.
- ·The client is walked through the finished job with a printed operation card, not a rushed verbal handover.
- ·The crew leaves the client with a printed adjustment card so the multipoint keeps can be re-set six months on without a callout.
- ·The client's alarm sensors on the old frames are removed and returned to the client, not binned by default.
- ·The friction stay screws are torque-limited, not driven at full trigger — over-driven screws strip the stay chamber.
- ·The internal reveal is masked before any silicone runs, so the finished bead is a clean line against the plaster.
- ·The multipoint gearbox is thrown by hand before the frame goes in — a factory fault at that point is a five-minute fix.
Free casement windows survey — 1930s semi-detached, Caerphilly
Book a 30-minute visit. We walk every reveal, sample the side-hung, top-hung or fixed pane combinations against the elevation, and email a written figure inside 24 hours.
Summary — casement windows on a 1930s semi-detached in Caerphilly
We fit casement windows on 1930s semis across 1 window in 90 minutes, full-house in 1–3 days, using chamfered or sculptured 70mm uPVC profile with side-hung, top-hung or fixed pane combinations. Off-street parking makes van access straightforward — we can stage glass in the driveway rather than on the pavement. Vaulted internal ceilings mean the crew works off a small tower for gable glazing — ground protection sheeting mandatory. Written figure inside a day of the survey. Terrace kerbs are usually granite and unforgiving — the crew boards from the van to the door to protect finished doors. Bay ceiling boxing hides century-old cabling; we test before drilling through the head of the frame. Coastal render is often painted in bright colours that mask sealant discolouration — colour matching at the frame perimeter matters. Estate roads loop back to themselves — the crew's van sits in one spot all day without moving.
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