Caerphilly Edwardian bay-fronted house patio doors — Rosac survey & install
If you've got a Edwardian bay-fronted house on your hands in Caerphilly, the recurring problem when quoting patio doors is the original bay corner posts have almost always been replaced in cheap 90s uPVC and now sag. Tired 80s sliding aluminium doors that stick, lose heat and rattle in the wind is the paired issue you'll usually hear about at the same visit. Our spec here is thermally broken aluminium or reinforced uPVC with toughened safety glass to BS EN 12150. 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. New-build reveals are square to within 3mm — packing is minimal and the frame lands true first time. Original conversion sealant is often silicone that has failed at the perimeter; we strip and re-run at every swap. Brick reveals absorb sealant unevenly; we prime the arris with SBR before the perimeter bead runs. Original stone reveals need a resin anchor rather than plug-and-screw — the dressed face crumbles under mechanical fixings. Original Crittall frames still exist on some ex-council properties — check the perimeter for lead-paint before disturbing. Rural access often includes a farm gate and a narrow lane — we check turn-in width at survey. Rural cottages often have limited off-road parking; the van sits on the road and the crew boards through the front door.
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.
Planning & permissions
Bay elevations are a strongly protected feature in most Edwardian conservation areas — we usually replicate the original sightlines rather than modernise.
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.
What makes a Edwardian bay-fronted house its own thing
- stained-glass toplight above the front door and often above the bay
- red brick or render-over-brick with stone cill and lintel detail
- canted or square bay window projecting from the front elevation
- wider frontages than Victorian terraces — usually 5.2–6m
Who's asking
Families in the leafy Edwardian suburbs and downsizers moving back into the character stock for the layout.
In Caerphilly specifically that reads as young families upgrading first homes, long-time owners replacing original 90s uPVC. The recurring driver for a patio doors enquiry is: Owners who want the bay preserved as a feature, not flattened, and hardware that reads period.
Reveal and install detail
- → The porch canopy sits at 2.0–2.1m — deliveries and scaffold lifts need to allow for it.
- → Reveals are usually rendered internally over lath, so care during removal stops big patches falling.
Method: lintel and floor checked for level, track set with stainless packers, doors hung and aligned so they roll true under their own weight.
Guarantee: 10-year product, 2-year fitting.
What we typically find on survey
- ·The kitchen window has a defrost line across the low-e coating — argon gas long gone.
- ·The middle mullion sags visibly across the top rail on any window wider than 1.6m.
- ·The top vent has been kept permanently closed with a wooden shim wedged inside the frame.
- ·The gasket at the vent has perished and pulled away from its channel in two-inch sections.
- ·The bay corner post has never had its structural bracket — a common corner-cutting shortcut a decade ago.
- ·The internal reveal plaster is spalling under the cill where condensation has run for years.
- ·Two units have the classic dust ring inside the sealed gap, meaning the perimeter seal has been breached for at least a year.
- ·The internal glazing bead across the top of the bay lifts out completely with fingernail pressure.
- ·One sash locks by lifting a nail out of the frame — a bodge from a decade ago that everyone forgot about.
- ·The internal beadwork has been painted so many times the mitres are unrecognisable.
- ·The composite slab has swelled by 2mm on the hinge stile from years of morning-sun exposure.
- ·The sealed unit is a 20mm gap, not the modern 28mm minimum, so U-values are into the mid-2s at best.
- ·The composite front door skin has a shallow dent from a delivery bike handlebar and it has ovalised the door.
- ·The composite door slab has a hairline crack along the letterplate cut-out from a delivery boot.
- ·A previous cylinder swap left the escutcheon plate rotating freely — a snap risk that nobody logged.
- ·Original door furniture is 90s brass, tarnished, and no longer matches anything else on the elevation.
- ·A previous decorator's dust sheet was left inside the frame chamber during a repaint and is still there.
- ·The trickle vents are painted shut and the room fugs up within an hour of the kettle going on.
- ·There is a permanent green algal streak below the sill where water is bypassing the drip groove.
- ·The letterbox opening is not draught-proofed at all — a candle held two feet away flickers in a light wind.
- ·The frame drainage slots at the bottom are clogged with debris, so rainwater sits inside the chamber.
- ·The porch canopy has been leaking directly onto the top of the door for years — the top edge of the slab is soft.
- ·The old timber sub-frame under the current uPVC unit is still in place and is soft at the bottom left corner.
- ·The manufacturer's kite mark on the corner of the glass is late-90s vintage, which explains the thermal performance.
Why residents are enquiring right now
- ·The resident is moving elderly parents in downstairs and needs the front threshold to be wheelchair-usable.
- ·The buyer wants the property to be quieter after 11pm — the street noise is fine, the bass from next door is not.
- ·A newborn has arrived and the parents want the nursery to hold a stable overnight temperature.
- ·The resident cycles to work and wants a bike-in-porch design that a survey needs to plan around.
- ·The owner wants the job to finish clean — no leftover offcuts in the skip on the drive, no sealant on the render.
- ·The buyer has just moved in and is fixing everything the vendor's homebuyer report flagged, in priority order.
- ·The homeowner is targeting a specific EPC band ahead of a rental switch and needs the frames to contribute measurably.
- ·The owner is done with the biannual repaint of the timber back door and wants a paint-free equivalent.
- ·The homeowner has watched the neighbour's job go in and knows exactly what they do and do not want.
- ·The current front door leaks visibly around the letterplate every time the wind swings east.
- ·The homeowner has an infrared thermometer and has been point-checking the frames — they want the readings up by ten degrees.
- ·The homeowner is on holiday half the year and wants a security spec they can leave for weeks without worrying.
- ·The owner wants the frames to disappear visually and let the view do the work.
- ·The owner is preparing the elevation for a specific street-photo listing and wants the finish to be photographable in raking morning light.
- ·The homeowner wants the composite slab to be paintable without voiding the manufacturer warranty.
- ·The resident is done with condensation-driven mould at the sill line every February.
- ·The owner is having a kitchen refit next month and wants the patio door in first so the tiler works to a fitted threshold.
- ·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 resident is on a listed street and wants a front door that will pass Article 4 first time.
- ·The owner has an electric car on the drive and wants the front to say the whole property has been kept up.
- ·The homeowner is done with the whistle the front door letterplate makes in a north wind.
- ·The homeowner wants matt black hardware because everything inside the house is matt black — no chrome to argue with.
- ·The customer wants a specific hardware colour to match a kitchen renovation booked six months out.
- ·The resident wants the patio door to slide with one finger — not the two-handed heave the current one takes.
How we actually fit it
- ·The old handles are offered to the client before being binned — sometimes a chrome D-handle finds a shed door life.
- ·The internal cill is scribed with a coping saw against the reveal plaster, not butted flush with a caulk joint.
- ·The old keys are collected and destroyed, not left in a bag on the drive.
- ·The manufacturer's serial-number label on the new frame is peeled off, not left to yellow on the glass for years.
- ·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 window board is scribed to the plaster line, not left with a caulked gap that shows in raking light.
- ·The frame is protected with a low-tack film across any face a tool might touch during the fitting hour.
- ·The frame perimeter is checked with a smoke pencil for airtightness before the internal trims go on.
- ·The internal cill support is packed with hardwood the full depth of the cill, not just at the ends.
- ·The crew leaves the client with a printed adjustment card so the multipoint keeps can be re-set six months on without a callout.
- ·Sealant is a single continuous bead run at the perimeter, not overlapped in six-inch runs.
- ·The internal architrave is coped rather than mitred where the reveal wall is out of true.
- ·The frame is protected with a low-tack tape at any point a tool might scrape it during the fitting hour.
- ·The crew photographs the finished elevation from the street and shares it with the office as the sign-off record.
- ·The client's paint colour is sampled at the survey visit and matched at the office before the fitters arrive on install day.
- ·The threshold ramp on an accessible door is set to a maximum 15mm rise and confirmed with a spirit-level lip.
- ·The window boards are pre-treated on the underside with a moisture seal before setting in place.
- ·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 multipoint hooks are lightly greased after fitting, before the door is closed for the first time.
- ·The perimeter foam goes in in two passes so the second lift meets the first without a void in the middle.
- ·The keeps for the multipoint are set with a strike plate template, not marked by eye against the closed door.
- ·The van carries a set of dust extraction attachments and uses them on any grinder work in occupied rooms.
- ·The threshold is bedded on butyl mastic under the outer skin, giving the fitter a second waterproof line behind the perimeter silicone.
Free patio doors survey — Edwardian bay-fronted house, Caerphilly
Book a 30-minute visit. We walk every reveal, sample the 2- or 3-panel sliding patio against the elevation, and email a written figure inside 24 hours.
Summary — patio doors on a Edwardian bay-fronted house in Caerphilly
We fit patio doors on Edwardian bay-fronts across single day for a 2-panel slider, 1–2 days for French sets, using thermally broken aluminium or reinforced uPVC with 2- or 3-panel sliding patio. Gravel front gardens mean the crew boards from the van to the elevation to avoid tracking stones inside. The load path through the bay corner post pulls diagonally when the roof sags; reinforced steel accepts it, aluminium alone deflects. Written figure inside a day of the survey. The rear garden extension pattern (added 80s–00s) usually holds the tired patio door — replace it as part of the same job. Alley access at the rear is barely wide enough for a single pane of 1200x900 glass — we plan lift paths around it. Where the original glazing bars were 22mm ovolo, we match printed bars to that width — not the modern 26mm default. Seafront elevations often benefit from a rain deflector bar over the composite door letter plate — standard spec here.
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