How to compare double glazing quotes fairly

Start by comparing like for like

The single biggest reason two quotes end up far apart in price is that they are not actually quoting for the same thing. One company might be pricing a standard double glazed unit with basic hardware, while another has included laminated safety glass, a higher security lock and better trims, without either quote saying so plainly.

Before comparing totals, line up the frame material, glazing specification, hardware and any extras side by side. If a quote is vague about any of these, go back and ask for the detail rather than assuming it matches the other quote.

Ask for a per window or per door breakdown

A total price for the whole job is hard to check against another total price. Ask each company for a breakdown by opening, so you can see the cost of, say, the bay window in the lounge or the back door separately from the rest. This makes it much easier to spot where one quote has priced a particular item very differently from another, and to ask why.

Be wary of discount pressure and one day offers

Pressure tactics are a bigger red flag than any single price, and a few patterns come up often enough to be worth naming plainly.

A fair, fixed written price should hold whether you decide that day or a fortnight later. Genuine businesses expect customers to compare quotes, and pressure to commit immediately is worth treating as a warning sign rather than a bargain.

• A large discount only available if you sign on the day the surveyor visits
• A price that is presented as reduced from a much higher figure with no clear basis for that higher figure
• Repeated follow up calls pushing you to decide quickly
• Any suggestion that the offer will not be available if you get other quotes first

Check the actual glass specification

Double glazing is not one single product. Two quotes for 'double glazed windows' can still differ in the gap between panes, the type of gas fill, the coating on the glass and the resulting energy performance. If energy efficiency matters to you, ask each company to state the window energy rating or U-value they are quoting, so you are comparing performance as well as price.

Read finance offers carefully

Some quotes are presented with a monthly finance figure front and centre, which can make it hard to see the true overall cost of the job. Always ask for the full cash price alongside any finance figure, and check the total repayable amount over the full term before deciding whether finance suits you. A quote framed only around a monthly payment is not necessarily a bad quote, but it needs the full numbers alongside it to compare fairly with a cash price from another company.

Ask about references and see the work

It is reasonable to ask an installer whether you can see a completed job nearby, or speak to a previous customer, particularly for a larger project like a full house of windows or a conservatory. A company confident in its work should not object to a reasonable request like this.

It is also worth checking that a site visit and survey happens before a final price is confirmed, rather than a price being given from a phone call or a rough estimate alone, since accurate measurements affect both cost and fit.

A simple checklist before you decide

Before signing anything, it helps to run through a short list of questions covering the points already discussed above, so nothing gets missed in the moment.

• Is the specification for frame, glazing and hardware written down and comparable across quotes
• Is there a per window or per door breakdown
• Does the price stay the same if you take a few days to decide
• Is the guarantee type and length stated clearly
• Is the company registered with a competent person scheme such as CERTASS
• Does the quote include waste removal and making good

Taking your time is normal

Replacement windows and doors are a significant purchase for most households, and it is entirely normal to want more than one quote and a few days to think it over. A fixed written price from us stands regardless of how long you take to decide, and we are happy to talk through how our specification compares with another quote you have received.

Comparing warranty and aftercare terms

Price and specification are only part of the comparison. It is worth setting the guarantee terms from each quote side by side too, checking the length of cover, whether it is backed by insurance so it still applies if the installer ever stopped trading, and exactly what is covered, for example frames, glass units, hardware and workmanship. A slightly higher quote with stronger guarantee terms and CERTASS registration can represent better overall value than a cheaper quote with a shorter or vaguer guarantee.

Ask each company how they handle aftercare too, such as what happens if a seal fails or a handle becomes stiff a couple of years after fitting, since the answer often reveals more about a company's approach than the sales conversation does.

Comparing installers, not just products

The same window system can be fitted well or badly, so it is worth comparing the installer as much as the product on the quote. Ask whether the company uses its own employed installers or subcontracts the work out, how long they have been trading locally, and what happens if a problem is found after fitting. A company covering the Wirral, Chester and the surrounding area with its own installers is generally easier to get back out for a snagging visit than one working further afield through subcontractors.

Questions we get asked on site

How many quotes should I get?

There is no fixed rule, but two or three gives you enough to compare specification and price sensibly without dragging the process out too long.

Why do quotes for the same windows vary so much?

Usually the specification differs, such as glazing type, hardware quality or what is included for making good, rather than one company simply charging less for the same thing.

Should I be suspicious of the cheapest quote?

Not automatically, but check the specification closely, since a lower price sometimes reflects a lighter specification rather than better value.

Is it rude to ask an installer to match another quote?

No, it is a normal part of comparing quotes, though a reputable installer will focus on explaining their own specification rather than simply matching a number.

Does a longer guarantee always mean a better quote?

Not on its own, but a longer, insurance backed guarantee with clear terms is a genuine point in a quote's favour, especially when compared against a similarly priced quote with weaker cover.

Should I ask whether the installer uses its own fitting teams?

Yes, it is a reasonable question, since employed installers are generally easier to bring back for any snagging or aftercare than a subcontracted team working further away.