Joiner
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Don't know what you're looking at, Rog. My figures for the basic costs are:
Both types 4mm, low 'e', gas-filled.
Standard unit £40.63 per sq.m + £6.50/sq.m for gas + VAT
Slimlite unit £83.85 per sq.m (inc gas) + VAT
The delivery cost of £130 is a one-off per delivery, so cost per item will reduce with quantity (although still a bit stiff).
It is a possible way around the knee-jerk reaction of some COs against double-glazing per se, especially on Grade 2 listings, and at least makes the point arguable.
As for the conversion of single to double-glazed - when you factor in the cost of machining the existing rebates (or re-making the whole sash) it's not going to work out any different in the long-run and at least makes the process feasible and the retention of original features possible.
It's at least worth considering as another weapon in the arsenal.
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