Would I be mad to consider upvc bifold doors in a south facing house?

[CurlyhairedAssassin]

I've read that upvc bifold doors end up warping and giving problems especially when they are in direct sunlight. Our extension plans specify upvc bifolds but am wondering if that will be a mistake? Is aluminium worth the extra?

Meant to add: we are on a budget so everything else will be a basic spec.

Not sure about the budget but we're having wooden ones made by a local joiner. Much cheaper than any of the quotes we got from elsewhere.

White shouldn't warp. If your going for dark brown, I personally would avoid uPVC. Tho to be fair solar insolation on other parts of the world causes much more of a problem for dark uPVC than the UK!

Our S facing double doors have lost their top gloss coat, but are structurally sound. Its cosmetic.

How long have you had them, addicted? We would be getting white ones. I know some people don't like the look of them but they're fine for us (well, fine for our budget )

Double doors might be easier to stay structurally sound than a long run of 4, though, I guess.

What's your budget? You can get stock / ex-display aluminium ones for much cheaper than standard so that might be an option.

They went the first summer, which is why I think it might have been a faulty batch.
The manufacturer has been out and restored the top coat, but it went the next summer. I don't think its normal. Sorry, should have said that initially.