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Replace two garage windows

I have a garage which is going to be used as a work room / studio. It is an older garage, perhaps a Skyline or similar which has two sets of windows that I would like to replace so that I can actually open windows for fresh air. I have been to see a demo firm and they suggested that I used aluminium windows to replace the existing ones. I would need the old windows removed, the new ones inserted in their place. Many thanks, Judy