Windowsill Prices
in Windows
Not enough purchase data yet
We publish a price once we've seen enough independent purchases to make it meaningful. This one isn't there yet.
How we know this
These figures come from real invoices processed through CostCrunch, not list prices or survey data. Each line is normalised to a price per unit, the top and bottom 1% are excluded as outliers, and a figure is only published once there are at least 10 purchases of that item in the last 12 months. Where a figure rests on a single supplier or a single company we say so, because that is one buyer's experience rather than a market rate.
Check your own invoices against these prices — CostCrunch reads every line item and flags anything above market.