Aluminium doors have gone from commercial-only to the default choice for rear extensions and open-plan kitchens across Hamilton, from the Victorian terraces near the Low Parks to the newer estates out towards Meikle Earnock. They look superb and they last, but the gap between a good aluminium door and a poor one is wider than most brochures admit. Here is what actually matters before you spend the money.
Aluminium's real advantage is strength-to-weight. Because the frame carries the load with far less material than uPVC, you get slimmer sightlines and far more glass, which matters in a north-facing Hamilton back garden where daylight is at a premium. A three-panel aluminium bifold can give you around 70mm of frame between panes where uPVC would need double that.
It is not automatically the right answer, though. If you are replacing a standard front door on a modest budget, a good composite door will usually outperform aluminium on price and thermal performance for the same opening. Aluminium earns its keep on wide openings, on doors over roughly 2.2m tall, and where you want a slim, contemporary look that uPVC cannot reproduce.
Bare aluminium conducts heat readily, so every decent modern door uses a polyamide thermal break: an insulating strip separating the inner and outer frame. Cheap imported systems sometimes use a narrow break, or none at all, and you will feel it as cold frames and condensation running down the inside on a frosty January morning in Lanarkshire.
Ask the installer for the whole-door U-value, not the glass U-value. Scottish building standards require a maximum of 1.6 W/m²K for replacement doors, and a well-specified aluminium bifold or sliding door should land somewhere in the 1.2 to 1.5 range. If a quote quotes only the centre-pane figure, that is a warning sign.
Prices move with aluminium commodity costs and glass, so treat these as ranges rather than promises. Supplied and fitted in the Hamilton area, you would typically be looking at:
Most like-for-like door replacements in South Lanarkshire are permitted development and need no planning permission. The exception matters locally: if you are in a conservation area or the property is listed, altering the appearance of a front elevation usually does need consent, and South Lanarkshire Council will take a view on frame materials and colour. Check before you order, not after.
Widening an opening or forming a new one in an external wall is different again. That is structural work and needs a building warrant from the council, which your builder should arrange. Any glazing within 800mm of floor level, or in or beside a door, has to be toughened or laminated safety glass to BS 6206. Reputable installers do this as standard, but it is worth confirming in writing.
Aluminium is unforgiving of a sloppy fit. Bifolds and large sliders run on a track that must be dead level along its whole length, because a few millimetres of settlement will show up as panels that bind or refuse to latch. Insist that the threshold is properly supported and that drainage is set out so water runs away from the house rather than pooling in the track.
Also ask about the finish. A powder coat to BS EN 12206 with a marine-grade specification is worth having, and a 25-year finish guarantee is common. Check whether the guarantee covers the hardware separately, because hinges and rollers on a heavy bifold typically carry a shorter term than the frame does.
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