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Not if you want to paint it. Redwood of whatever kind the builders merchant has in stock is a good option. Don't expect it to be straight if you are picking it up from a merchant. You need to go along and eyeball every piece you take and they will try to mug you off with anything if they get a chance! It's also very cold and damp in most timber yards now so it should be kept indoors to acclimatise.
Oak just doesn't like to be painted so there's no point in using it.
There's another wood being used in a lot of window construction but I've not found a source for it. Apparently it has a high percentage of stable resin in it. It is supposed to be quite tough on the tools cutting and shaping it though.
I need to make a window frame to house a d glazed unit - is oak a good choice of material or overkill? It will be painted.