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He said that it’s a 250mm cavity wall. I’m therefore assuming then these plans measurements are from the inner side of the external brick and not from the innerside of the inner concrete block ? If that makes sense That would make sense on 50mm insulation and 100mm concrete block =150mm

If those are the external dimensions I’d be expecting 5000mm x 3350mm surely??? With a 250mm cavity wall With these dimensions I’m not getting the asked for 4500x3100 internal

i wonder if anyone can help and explain to me as I’m not a builder I’m currently getting quotes for an orangery extension and I’ve asked for an internal dimension of 4500mn x 3100mm but the 3D CAD plans are coming back as written 4800mm and 3250mm on the CAD drawing why is that . The 3250mm is...