Cardiff barn conversion patio doors — Rosac survey & install
If you've got a barn conversion on your hands in Cardiff, the recurring problem when quoting patio doors is original conversion glass is often 90s-spec and now poorly performing thermally. 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. Vaulted internal ceilings mean the crew works off a small tower for gable glazing — ground protection sheeting mandatory. Off-street parking makes van access straightforward — we can stage glass in the driveway rather than on the pavement. External cill drips block with paint over the decades — raking them clean stops water sitting on the frame after install. Original front cills are usually blue engineering brick — leave them, drill through them for the frame fixings. Bay window scaffold requires a chimney tie or through-bolt to the party wall — allow an extra hour on set-up. Estate covenants are searchable through the deed pack; we ask the client to confirm colour before ordering foil. Stone reveals need resin anchors, not plug-and-screw — dressed stone crumbles under mechanical fixings. Door head heights sometimes below 1.9m; a standard 1981mm slab needs trimming or a bespoke height ordering. Tile porches are laid on a lime bed that reacts poorly to modern silicone; we mask and use low-modulus polymer instead. Rear outshut kitchens often have flat felt roofs at 2.1m — glass and frame heights are set to clear the eaves.
Local context — Cardiff
- Council
- Cardiff
- Postcodes
- CF10, CF11, CF14, CF23, CF24, CF5
- Main route
- A48
- Nearest town
- Penarth (4 mi)
Neighbourhoods we cover: Whitchurch, Rhiwbina, Canton, Splott, Llandaff, Roath. 10 miles from base, A470 the whole way — Cardiff installs run as smoothly as our home patch.
Planning & permissions
Barn conversions in the National Park or open countryside often have planning conditions attached to the original conversion — frame style and colour may be fixed.
Locally in Cardiff, Cardiff Council covers this area. Capital city — everything from Edwardian conservation-area bays to glass-fronted Bay apartments. We check any conservation or Article 4 status against the address before quoting rather than after.
What makes a barn conversion its own thing
- large, tall glazed openings where the original hay doors sat
- rural setting with wide van access but soft-ground concerns
- vaulted ceilings with rooflights or gable-end glazing
- exposed timber lintels and stone reveal detail
Who's asking
Owner-occupiers who bought the character property for the space, and holiday-let owners upgrading thermal performance to lower running costs.
In Cardiff specifically that reads as city professionals, young families in the suburbs, landlords with HMOs near Cathays Park. The recurring driver for a patio doors enquiry is: Owners hitting the 25–30 year mark on the original conversion and replacing the whole glass set to modern spec.
Reveal and install detail
- → The sealant perimeter needs low-modulus polymer to accommodate stone movement.
- → Lintels are often original oak beams — we work around them, not through them.
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 top vent has been kept permanently closed with a wooden shim wedged inside the frame.
- ·The glazing spacers between panes carry the visible desiccant snowfall that gives away a blown unit.
- ·A homemade timber threshold has been screwed to the concrete cill in front of the patio door.
- ·A previous cylinder swap left the escutcheon plate rotating freely — a snap risk that nobody logged.
- ·Every casement in the property opens with a firm tug on the second click — the friction stays are seized.
- ·There is a permanent green algal streak below the sill where water is bypassing the drip groove.
- ·The multipoint keeps have worn a shallow groove where the hooks now catch — closing needs a lift-and-pull.
- ·The friction hinge on a bedroom window has one detent — it either opens fully or slams shut on any breeze.
- ·The door-side glazed sidelight has a shattered internal pane held together by the laminated interlayer.
- ·The composite slab has swelled by 2mm on the hinge stile from years of morning-sun exposure.
- ·The composite door skin has a UV bloom on the south-facing elevation that no longer matches the colour on the shaded elevation.
- ·The escutcheon on the front door is loose and rotates as the key turns.
- ·The georgian bar between panes on one unit has slipped off its top spacer and is sitting diagonally inside the sealed cavity.
- ·The middle mullion sags visibly across the top rail on any window wider than 1.6m.
- ·The outer frame has moved fractionally over the years, dropping the bottom hinge screw pattern out of line.
- ·There is a paint bridge from the internal architrave to the frame that will crack the moment the new unit lifts out.
- ·There is no drip groove on the underside of the cill — water tracks straight back onto the brick face.
- ·The composite door slab has a hairline crack along the letterplate cut-out from a delivery boot.
- ·The catch keep for the bathroom window has been packed out with a folded matchbox to make the sash lock.
- ·The frame reinforcement steel inside the outer frame has begun to rust and stain the internal white finish.
- ·The stay arm on the top vent has bent and no longer sits into its rest bracket cleanly.
- ·One kitchen unit has a defrost trace across the low-e coating — the argon fill has been gone a while.
- ·The bottom track on the sliding door has a build-up of grit that the rollers grind through every open cycle.
- ·A previous fitter foam-filled the reveal gap directly against the frame, and the foam has now pushed the jamb inward.
- ·The sealed unit is a 20mm gap, not the modern 28mm minimum, so U-values are into the mid-2s at best.
- ·The georgian bar between the panes has come detached from the top spacer on one unit.
- ·The old timber back door has a live rot pocket at the bottom hinge that reads soft to a screwdriver tip.
- ·The gap under the front door has been carpet-strip filled from inside — the exterior weather bar is missing.
- ·The letterplate has a hinged internal flap that has snapped off and is currently held in place with masking tape.
- ·The frame drainage slots at the bottom are clogged with debris, so rainwater sits inside the chamber.
Why residents are enquiring right now
- ·The owner has watched the bay corner posts sag for a decade and now wants them straight and structural.
- ·The resident wants the sliding door to open with a fingertip after ten years of use, not two hands after two.
- ·The homeowner is on holiday half the year and wants a security spec they can leave for weeks without worrying.
- ·The resident wants an installer who will point out things the current property is doing well and leave those alone.
- ·The resident wants the front door to sound solid when it closes — a hollow slap does not read as secure.
- ·The buyer wants an installer who will still exist to honour a guarantee in year eight.
- ·The buyer wants a written commitment on the sealant colour and the trim colour before any deposit changes hands.
- ·The resident wants the crew to remove and re-hang the internal curtains as part of the job, not leave that step to them.
- ·The buyer wants a genuine Which? Trusted Trader install, not a subcontracted crew running the badge.
- ·The homeowner wants the front porch to feel enclosed in winter and open in summer.
- ·The homeowner is on a smart meter and can see the room-by-room heat loss on a phone app.
- ·The resident cycles to work and wants a bike-in-porch design that a survey needs to plan around.
- ·The owner is done paying to service failing 90s uPVC every couple of years and wants the whole set replaced together.
- ·The insurance renewal notice flagged a locks upgrade requirement and the owner wants it done before the policy anniversary.
- ·The resident does not want to be sold to — they want a survey, a written figure, and to be left to decide.
- ·The resident wants the noise of the school run down and the light from the morning sun up.
- ·The resident has already had one failed installation and wants to know exactly how this one will differ.
- ·The buyer is done with the sound of the frames rattling in a gale.
- ·The buyer wants the whole ground floor to feel more connected to the garden without losing the wall.
- ·The buyer wants no upsell scripts — a survey, a spec, a figure, and space to think.
- ·The buyer is furnishing the property for short-term let and wants a five-year cosmetic warranty on the door slab.
- ·The resident is a keen gardener and wants a patio door that opens as fully as possible into the garden.
- ·The owner wants the crew to talk to the neighbour before scaffold goes up on a shared party wall.
- ·The resident has been quoted for solar and does not want the roof work to happen before the windows do.
- ·The wife wants the noise from the trunk road down; the husband wants the heating bill down; both are on the enquiry.
- ·The buyer wants a composite door slab that a courier's boot cannot dent when a delivery is fumbled.
- ·The owner wants the whole property refurbished for a big family gathering nine weeks out — everything sequenced tightly.
- ·The homeowner is planning a garden studio and wants the patio doors to bookend the view when it's finished.
- ·The homeowner is selling the property and only wants to replace what visibly holds the survey back.
- ·The homeowner has finally accepted the timber back door is beyond another repaint and wants the like-for-like replacement design chosen with them.
How we actually fit it
- ·The frame square is checked at the diagonals before any glass goes in — a square frame stays square.
- ·The internal cill is scribed with a coping saw against the reveal plaster, not butted flush with a caulk joint.
- ·The crew calls the client at 5pm the day before to confirm arrival window and site access details.
- ·The internal make-good uses caulk to the plaster, silicone to the tiles, and neither where paint has to go over.
- ·The old broken glass is bagged in a labelled sack, not tipped loose into a general skip.
- ·Sealant is a single continuous bead run at the perimeter, not overlapped in six-inch runs.
- ·The crew photographs the finished elevation from the street and shares it with the office as the sign-off record.
- ·The finished elevation is photographed from the pavement and uploaded to the office job file as sign-off record.
- ·The wall around the frame is Hoovered before the client sees the room again — brick dust ages a first impression.
- ·The crew takes the old glass off site in a labelled sack that day, not a skip left on the drive.
- ·The frame is protected with a low-tack tape at any point a tool might scrape it during the fitting hour.
- ·The letterplate is fitted with the internal flap set to close under its own weight without dragging.
- ·The composite door slab is inspected under torchlight for delamination before the hinges are fitted.
- ·Fixings are always at the reinforcement points — a screw through the chamber alone loosens within a year.
- ·The glazing bead is tapped in with a rubber mallet, not a metal claw — the profile marks otherwise.
- ·The keeps for the multipoint are set with the door open and the position marked, not adjusted by eye once the door is closed.
- ·The old cylinder is disposed of by the crew, not left in a bag on the drive for the client to bin.
- ·The bead-in tools are rubber-faced, not steel — a steel tool marks the profile within minutes.
- ·The mitre joins on any Georgian bar are picked to face the corner that is least visible from indoors.
- ·The internal skirting is protected with a strip of packing tape across the top edge before any tool touches it.
- ·The lock cylinder is measured to sit flush with the escutcheon plate — a proud cylinder is a snap risk.
- ·The frame reinforcing steel is confirmed inside the top rail before the transom fixing is chosen.
- ·The internal cill support is packed with hardwood the full depth of the cill, not just at the ends.
- ·The reveals are photographed on arrival so any pre-existing damage is on record before the crew touches them.
- ·The frame is protected with a low-tack film across any face a tool might touch during the fitting hour.
- ·Every silicone bead is tooled with the correct radius spatula, not smoothed with a wet finger only.
- ·The composite slab is not cut on site — if it does not fit, a new slab is ordered rather than trimmed.
- ·The van carries a set of dust extraction attachments and uses them on any grinder work in occupied rooms.
- ·Trickle vents are drilled through the outer frame with a bespoke jig — not freehand with a spade bit.
- ·The trickle vent chamber inside the frame is proven clear with a torch before the outer cap goes on.
Owner occupiers replacing one door or one window
Written for owner occupiers replacing one door or one window
A single replacement is a half day job for us and a whole day of your time, so the useful detail is arrival window, how the old frame comes out, and how the new one is made good inside and out.
The things worth checking before you accept a price
- A fixed price for one opening with no minimum order pressure
- Making good inside so there is no decorating job left behind
- The frame perimeter is checked with a smoke pencil for airtightness before the internal trims go on.
- The friction stay on a new casement is set to the client's preferred restraint at handover — 45°, 90°, or fully open.
The same ten year product guarantee applies whether you buy one unit or twenty
Book a half day slot in Cardiff
Single replacements are usually in and out in a morning, old frame taken away and the reveal made good before we leave. Patio doors for barn conversions properties in Cardiff, single day for a 2-panel slider, 1–2 days for French sets, with a written price inside 24 hours.
Questions we get on barn conversions jobs like this
Do you handle the old frames and glass?+
Removal, disposal and recycling are all in the quoted figure. Sealed units go to a glass processor, uPVC to a profile recycler, and the skip or van load never sits on a Cardiff street overnight.
Will planning rules affect patio doors on this kind of property?+
Barn conversions in the National Park or open countryside often have planning conditions attached to the original conversion — frame style and colour may be fixed. We check the position with Cardiff Council before anything is ordered so there is no surprise after manufacture.
Will the house be secure and weathertight overnight?+
Every opening we take out goes back the same day, so nothing is boarded overnight. If weather closes in mid-fit we seal and make safe before we leave, and 10 miles from base, A470 the whole way — Cardiff installs run as smoothly as our home patch, so getting back first thing is straightforward.
Do you fit patio doors on barn conversions around Cardiff?+
Regularly. Cyncoed, CF10 is where most of this work lands, and we also cover Penarth, Caerphilly, Barry. 10 miles from base, A470 the whole way — Cardiff installs run as smoothly as our home patch.
Do you take on single window or single door jobs?+
Yes, and there is no minimum order. A single opening is usually a half day, including removing the old frame and making the reveal good inside and out.
Is it cheaper to repair the existing frame?+
Often, yes. Hinges, handles, gearboxes and single sealed units can all be replaced without touching the frame. We quote the repair first when the frame itself is sound.
Free patio doors survey — barn conversion, Cardiff
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 barn conversion in Cardiff
Next step for a barn conversion patio doors figure in Cardiff is a 30-minute survey — we walk every opening, check the reveal detail, and write pricing the same day. Stone cills usually project only 40mm — the frame drip has to clear the projection without over-hanging. Post-war doors sat on a raised timber threshold; a Part-M part-plate replaces it cleanly at composite door install. Around Cardiff that usually means heritage-friendly frame profiles in conservation streets on Edwardian and Victorian bay-fronted houses in Cathays and Roath, 1930s semis in Llanishen, modern builds in Pontprennau, with Cyncoed and Llanishen the streets we are on most. Rear outshut kitchens often have flat felt roofs at 2.1m — glass and frame heights are set to clear the eaves. 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.
Let's make your house feel more like home.
Fill in a few details and we'll come back within 24 hours with a clear quote — no callout fee, no pressure.