If you have a double glazing quote sitting on your kitchen table right now, do not sign it. The price you have been given is almost certainly not the real price. This guide will show you exactly how to negotiate it down to the floor — using the same knowledge the salespeople have, but never share.

Our team has over 80 years of combined experience inside the UK double glazing industry. We trained the salespeople. We wrote the scripts. We know exactly how the pricing model works, and we know how to beat it.

First: Understand Why the Price Is So High

The salesperson sitting in your living room is almost certainly on a commission-only or low-basic contract. Their entire income depends on the sliding scale.

Every company has a secret floor price — the absolute minimum they will accept for a job while still making a profit. But the salesperson is allowed to quote you anything up to 50–60% above that floor price. The higher the price you agree to, the higher their commission percentage. They are financially incentivised to start as high as possible.

This is not a bug in the system. It is the system. And it has been running for over 40 years.

The Four Rules That Change Everything

Rule 1
Say the Magic Sentence Before They Start
The single most effective thing you can do is say this upfront, before the salesperson even opens their laptop: "I'm getting three quotes minimum. I won't be signing anything tonight, regardless of the price. I'll make my decision in my own time." This immediately disarms their high-pressure closing tactics. They know they have to give you a competitive price, and they know the fake deadline won't work on you.
Rule 2
Ignore Every Deadline They Give You
The most common tactic to stop you negotiating is the fake deadline: "This price is only valid tonight." "My manager said I can only offer this if you sign right now." In 30 years in the industry, we never once saw a price genuinely expire overnight. Not once. If they give you a deadline, tell them you need 48 hours. Watch how fast that deadline vanishes.
Rule 3
See Through the "Manager Call" Theatre
If you push back on the price, the salesperson will offer to call their manager for a "special deal just for you." This is pure theatre. In almost all cases, the salesperson already knows exactly how low they are allowed to go. The phone call is designed to make you feel like you are getting a unique, hard-won concession — creating a sense of obligation to sign. It isn't. It's a script.
Rule 4
Always Get Three Quotes — But Not From the Same Group
Getting three quotes is good advice, but only if the companies are genuinely independent. Anglian, Everest, and Safestyle are all now owned by the same private equity group (the ASHI Group). Getting quotes from all three is like getting three quotes from the same company. Include at least one regional or local installer in your comparison — they often have significantly lower overheads and no sliding scale commission model.

The Numbers: What You Could Be Overpaying

To understand the scale of the problem, consider a typical 6-window installation. The floor price — the actual cost to the company — might be £4,800. But the first price you are given could be £9,000 or more. Every pound above the floor price is commission and margin. The salesperson earns a percentage of that gap.

Most homeowners who push back get a "discount" to around £7,000–£7,500 and feel like they've won. They haven't. The floor price is still £4,800. They are still overpaying by £2,000–£2,500.

The Shortcut: Know the Floor Price Before They Arrive

Everything above assumes you are negotiating in the dark — pushing back without knowing what the real price should be. That is an uncomfortable position to be in, and most people give up before they reach the floor.

The better approach is to know the floor price before the salesperson even arrives. Then you are not negotiating — you are simply declining to pay more than the fair price.