Windows
Double glazed windows in Milton Keynes
Nine styles, in uPVC and aluminium. The differences that matter are how it looks from the street, how it opens, and how slim the frame is. Pick the one that sounds like your house and we will confirm the specification at survey.
-
uPVC Casement Windows
The everyday all-rounder
-
uPVC Flush Sash Windows
Sits level with the frame
-
Sliding Sash Windows
Period proportions
-
uPVC Tilt & Turn Windows
Two ways to open
-
Aluminium Casement Windows
Slim frames, more glass
-
Aluminium Flush Windows
Flat outside face
-
Aluminium Heritage Windows
The steel-window look
-
Bow and Bay Windows
A shape, not a style
-
French Casement Windows
An opening, not a style
The choice that matters
Both are A+ rated. The difference is the frame.
These are the two systems we fit, and we are glad to fit either. uPVC reaches the lower U-value and comes in the widest range of styles and shapes. Aluminium holds the slimmest frame, so more of the opening is glass, in any RAL colour you name. Both are A+ rated, both are made to measure, and both will outlast the mortgage. The figures below are the ones that actually separate them.
-
uPVC
- U-value from
- 0.95 W/m²K
- Colours
- 16 foils
- Security
- PAS 24
The lower U-value of the two, and the widest choice of styles, shapes and finishes.
-
Aluminium
- U-value from
- 1.0 W/m²K
- Colours
- Any RAL
- Sightlines
- Slimmer
The slimmest frame of the two, so more of the opening is glass. Any RAL colour you name.
Before you ask
The questions we get asked on the phone.
If you want a figure before you speak to anyone: Double glazing costs Aluminium window prices Sash window prices
Which of these has the lower U-value?
uPVC, at 0.95 W/m²K against 1.0 for aluminium. The gap comes from the frame rather than the glass, and both are A+ rated and comfortably inside what a replacement window has to reach. It is a small enough difference that most people choose on how the window looks instead.
Can I have one colour outside and another inside?
Yes, in both materials. On uPVC the colour is a foil bonded to the profile, on aluminium it is a powder coat, so a dual finish means two separate treatments rather than one.
How secure are they?
The uPVC range is PAS 24 accredited, which is the enhanced security standard, with multi-point locking as standard. We confirm the exact hardware at survey against where the window is and what it opens onto.
What does the guarantee cover?
Ten years on a new window installation. Repairs, replacement glass on its own, roofline, integral blinds and pet flaps sit outside it. We would rather say that here than leave it in the small print.
Our work
Recent jobs, photographed the day we finished.
How pricing works
Price a window before you speak to anyone.
If you like doing things yourself, build the job on the quote tool and see the number on the spot. If you would rather talk it through, book a free consultation and we will come to you.
What Milton Keynes homeowners say
Real reviews from real installations. Every one is public, so you can go and check them yourself.
Stuart Matthew
7 months ago
Fenster have just completed a front door installation on my new property - fantastic job and strongly recommend! The online design tool is great, Perry back at HQ is brilliant as is his communication. Andy, who installed the door, is a top gent and professional. Will definitely be a returning customer.
Read on Google
Joanna Hayes
2 months ago
Really happy with the service we received from Fensters Windows. Aaron and Shane turned up on time and were both really friendly. They explained any issues as they went along and talked us through the different options, which we really appreciated. They did a great job fitting our new back doors and cleaned up everything afterwards. We also paid exactly what we had originally been quoted, with no unexpected extra costs. Really pleased with our new doors and would definitely recommend Fensters Windows. Thank you Aaron and Shane!
Read on Google
Digger
2 months ago
We have used Fensters for years on a variety of glazing work, and 2 door installations. They are competitively priced and responsive. They take great care over measuring and specifying the work, giving you a clear quote so you understand what you are getting (thanks Perry!). The fitters are all extremely competent and personable. We had to replace our front door for accessibility reasons, they gave us confidence that our requirements would be met, reproduced the intricate leaded and stained-glass pattern of our old door, and did a quality fitting job (thanks to Johnnie and Shane!). In summary they are our go-to suppliers for all replacement and repair work.
Read on Google
Silvia Peraro
a month ago
I had an excellent experience with Fenster Glazing from start to finish. Nick Perry and David managed the initial quote to installation process seamlessly, keeping communication clear, honest, and completely stress-free. When it came to the actual fitting, Zac and Shane did a fantastic job with the installation, working efficiently and leaving everything spotless. The professionalism from the entire team was top-notch, and the final result looks brilliant. I highly recommend them.
Read on Google
Bernie Raffe
3 months ago
Great service from Fenster Glazing, very happy with our new bi-fold door, glass door and windows (with built-in blinds) There was an issue with the wrong spec of glass provided to them from their supplier, so they had to temporarily board up a door and a window, but this was put right within a few weeks. Recommended, thanks.
Read on Google Zak Jessup 12 Jun 2025Cannot recommend higher! Nick and Perry were really helpful in getting my windows sorted ASAP.
Read on Google Norman Cummings 10 Jun 2025The best service ever, great workmen, very high standard and in the finish, excellent eye to detail.
Read on Google
