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who are you going with for your uPVC?
Everest. We are getting uPVC sash windows. The frames are thicker, yes, but the surveyor has assured us that the profile will only be a few mm different to the existing TOTAL DOGSHIT single glazed alu windows. With all the other maintenance that comes with this house (built 1902), we didn't want to add anything else. Plus, warms and quiet. Heating this gaff is not easy, so anything to also offset that. Everest also do what they call a constant line of sight, so the frames are the same thickness on all panes, whether they open or not, so it's not so visually jarring (another thing I don't like about PVC, it's really obvious which ones open and which don't by looking at the thickness of the frame). We are getting 11 windows replaced, most nearly 2m tall, for about £14k. Wooden sash (from Everest, so would have likely been cheaper elsewhere) was £24k.
Thanks Both- wood needs too much maintenance tbh- it's for a 1960s townhouse, so materials are not a concern as they would be for a victorian/Edwardian period house . I get Alu is nowhere near as thermally efficient, but it does look nicer..... @stevo_com, who are you going with for your uPVC?
What id like to find are uPVC windows with an Alu like profile and look (i get the frame will be thicker due to the properties of uPVC), welds that are close to invisible, flat fronted as opposed to the opening windows protruding when closed, and frames that are very black , not some shade of anthracite