Aluminium or timber windows which is better. They are for a house on ground floor. And they will be covered by security grill. It will be hard to see the windows. We like the look of timber better. But does aluminium last longer. Is it also more maintenance free? For two timber windows supply only it is $1600. For 2 aluminium windows it is $1100. Plus $1000 for install and removal of two old rotted windows. The old windows are beautiful small paned glass but it will be too hard to fix them.