Selecting a double glazing firm - true or false statements?

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I need to replace all my windows in the house, patio doors etc. The total cost will range from anything between £18k to £40k, depending on which firm I go with.

I have narrowed my selection down to a few but I am trying to understand who is talking a lot of rubbish and who is making some sense, even if there is some inflated marketing truth. For the record, I am avoiding the mainstream firms like Anglian etc and sticking with firms who are local of within a 20 mile radius.

Spacer bar - Two firms have shown me some "premium" features including what I thought was nice, different coloured spacer bars (the aluminum strip that hold the glazed unit together all around the inside of the glass. I think either standard silver (or plastic) is the norm, but I've seen gun metal colour and from one and even a darker composite of some sort which the latter said is better as its not metal and therefore better for not conducting heat. Is there truth to this i.e. no metal is better and a darker colour gives a better effect so costs more?

Profile make for UPVC

I've narrowed down my window profile selection to Kommerling and one other which I have forgotten the name of but will come back to later. Are there any profiles I should avoid at all cost for UPVC.

Fensa certification
A few of the firms have said they are Fensa registered but I cannot find them anywhere on the Fensa database. One firm has said that they do use sub-contractors. Is it possible, and is it normal for sometimes the sub contracting firm to be Fensa registered but not the firm who is making the frames etc?

More questions to come, thanks.
 
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A lot of companies now use a warmedge spacer/foam spacer as it does not transfer the cold like an aluminium spacer would. Kommerling are up there amongst one of the best profiles
 
The standard/spec of window profile and spacer bar become irrelevant if the installation is poor.
There's not a big difference between the profiles nowadays, U values are similar but there can be a major difference between prices and the standard of installation. If they have subbies ask to see some of their previous work.
Out of interest 18-40k is a massive amount, what work is involved, how many windows, doors etc are there?
 
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Agree with all the above so far.
Warm edge spacers (non metal) are pretty standard nowadays and a must in my opinion, Price in difference is a few pounds per glazed unit. I cant see the other company being able to supply A rated windows without them?
Kommerling are fine and you cant really go wrong with any of the makes its all about how well they are put together and fitted.

As a general rule I'm not a fan of sub contractors for fitting. They are usually paid £60-80 per window so its in their interest to fit as fast as possible and not to fit them as well as they can.
If the company are FENSA registered at least one fitter per team should be MTC registered, This means they will have had to at least sit a theory and practical test.

As asked 18-40k is a huge amount, How big is this mansion/castle?
 



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There's also a 4 or 5 side windows not shown.

We'll probably go for Schuco aluminum sliding doors which is approx £9k. Another £15-20k depending on if I go for grey 7016 upvc frames and also including 2 large roof lanterns 3x1.5m. Doesn't include the front doors. Quite a few options to consider.
 
Nice place. Good choice of aluminium for the doors schuco are nice but pricey
 
In your opinion, do you think it is a bad idea to have grey aluminium coloured patio doors followed with white UPVC windows in the rest of the house to avoid having to pay 25% premium for grey UPVC windows to match?
 
In your opinion, do you think it is a bad idea to have grey aluminium coloured patio doors followed with white UPVC windows in the rest of the house to avoid having to pay 25% premium for grey UPVC windows to match?

Nope, treat them as a stand alone item much like having a red or blue front door when the rest of the house is white. It's a perfectly fine combination IMO
 
Thanks guys - I was getting a bit anxious on that issue.

Also any suggestions on whether the centre round feature window at the front of the house should be clear glass or frosted/sand blasted privacy glass? When looking through the it at street level, you won't be able to see in the bedroom immediately at the back as the door entrance is to the right.

The feature window is at the front of the first floor landing as shown below to give you an idea.

 
Totally up to you, If you have nice views you will never see them if you have obscure glass.
Could you fit curtains?
 

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