Understanding a window quote, line by line

Two quotes can name very different prices for what looks like the same job — because the detail differs. The frame material, glass specification, number of opening sashes and what’s included in the fitting all move the number. Reading line by line is how you compare fairly, and it’s the natural next step after your home survey.

The lines you’ll usually see

• Product and frame material — uPVC, timber or aluminium, plus the profile or range. This drives a big part of the cost.
• Glazing specification — double or triple glazed, the energy rating and the U-value. Lower U-values keep more heat in.
• Number and type of openers — fixed panes are cheaper than opening sashes, so the mix matters.
• Hardware and finish — handle style, colour, and any woodgrain or dual-colour foil.
• Fitting and making good — removal of old frames, disposal, and plastering or trims afterwards.
• Guarantee — length and whether it’s insurance-backed.
• VAT — check whether the total shown includes it.

If any term here is unfamiliar, our window jargon buster translates the lot into plain English.

What’s easy to miss

The costly gaps are usually in what’s not stated. Does the price include scaffolding for upstairs windows? Making good internal plaster? New sills or trims? Removal and disposal of the old units? A quote that itemises these is often better value than a cheaper one that quietly leaves them out and adds them later.

Match the specification, then the price

The golden rule: only compare quotes once they describe the same specification. A triple-glazed, A-rated window with an insurance-backed guarantee should not be measured against a basic double-glazed unit on price alone. If you’re still choosing between styles and materials, it’s worth reading up on choosing the right window style for your home so you know which spec you actually want.

With the detail understood, you’re ready to place quotes side by side — see comparing three window quotes.