How Many Double Glazing Quotes Should You Get?

Every buying guide says “get three quotes” without explaining why. The reason is statistical as much as commercial: with one quote you know a price, with two you know a range, and with three you can see which end of the range is unusual. That is all most homeowners need.

What each quote tells you

When three is right

• Full-house installations, where the totals are large enough that a 10% difference matters.
• Any job including doors, bays or structural work.
• When one quote is dramatically lower or higher than you expected.
• When you are considering aluminium or heritage frames, where price spread is widest.

When two is enough

For a single window, a replacement sealed unit, or a small repair, two quotes is proportionate. Below about £1,000 most installers are working to a minimum charge anyway, so a third appointment costs you more in time than it saves in money.

Why a fourth quote rarely helps

Once you have three comparable prices, a fourth almost always lands inside the existing range. What it does add is another two-hour sales appointment, another pressure conversation and more scope to confuse yourself. Better use of that time is to telephone the referees of your preferred two installers.

Make the three count

• Contact them within the same week, so they are pricing the same market conditions.
• Give all three an identical written specification.
• Mix two local independents with one national or larger regional firm for a genuine spread.
• Ask each for an itemised quote, not a single total.
• Take every quote away and compare in writing before speaking to any of them again.

The bottom line

Three quotes, one specification, all itemised. That is enough to establish a fair price for almost any domestic double glazing job, and it protects you from both overpaying and from being sold a smaller job at a tempting number.