Fenster Glazing
Window and Door Repairs
Something has stopped working: a handle has snapped, a door will not lock, a window will not shut. Tell us what it is doing and we will tell you what it usually is, roughly what it costs, and whether it is worth repairing at all. We repair windows and doors we did not fit as readily as ones we did.
Why have us repair it
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01
Quick and efficient
Most faults are diagnosed and priced without a visit, so the first thing that happens is an answer rather than an appointment.
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Dedicated service engineers
Two of them, with decades each behind them, and a van carrying the parts that fail most often.
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Transparent
You get the figure and the reason for it before anything is agreed, and nothing changes on the day without a conversation.
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Fairly priced
Priced off a set list rather than judged on the doorstep, so the same fault costs the same whoever we send.
Diagnostics
Most of it is fixable.
Windows and doors are built from parts that are meant to be replaced, so a fault is usually a repair rather than a new window. Pick whichever sounds closest to yours and we will show you what is normally behind it.
Windows
- It will not open, or it is stiff
- Multi-point mechanism. Identified from the backset, centres and faceplate, then replaced with the correct gear.
- The handle is broken or loose
- Handle. Matched to the spindle length and fixing centres already in the sash, in a finish that suits the rest of the house.
- It catches, or will not sit flush
- Realignment. We square the sash and reset the keeps and hinge packers so it closes under its own weight rather than being pulled to.
- There is a draught round it
- Hinges, or the seal. We check both. Stays reset or replaced, and the gasket re-run in one length round the sash if it has gone.
- The glass is misted or broken
- Sealed unit. Measured and replaced on its own. The frame stays where it is.
Doors
- It will not lock
- Gearbox, or alignment. We check the alignment first, because a new gearbox in a dropped door fails again. Then the gear, if it needs it.
- The key will not turn, or has snapped
- Cylinder. Replaced to the door thickness, and keyed alike if you want one key for the front and the back.
- The handle is floppy or snapped
- Door handle. Matched to the existing backplate centres and spindle, so the door is not left with holes in it.
- It has dropped, or catches on the frame
- Realignment. We re-hang the door square and reset the keeps, so it closes and locks without being lifted. Hinges only rarely need changing.
- There is a draught round it
- Realignment. We adjust the hinges and keeps so the door compresses its seal along the whole edge instead of at one end.
- The glass is misted or broken
- Sealed unit. The glazed panel is measured and changed on its own. The door stays on its hinges.
- My cat cannot get out
- Cat or dog flap. A sealed unit cannot be cut once it is made, so which of the two your door needs is settled before anything is ordered.
Who comes out
Two engineers, and the parts already on the van.
They carry the fittings that fail most often: handles, hinges, cylinders, gaskets and the common gearboxes. So it is often fixed on the first visit rather than looked at, ordered and booked in again.
They have decades each behind them, which is the other reason the diagnosis tends to hold. They have seen the system before, so most faults are recognised from a description and a photograph rather than found on the day.
Repairs we have done
What was wrong, and what we did about it.
Real repair visits, photographed on the day, on windows and doors we did not fit.
Sliding door glass replacement, Tattenhoe
A shattered 185 kg sealed unit in a large aluminium sliding door, replaced by a four-person team with the door left where it was.
Read case study
Window handle replacement, Haddenham
A window handle that had snapped off its spindle, replaced with a new locking handle in one visit.
Read case study
Door pane replacement, Sharnbrook
A shattered toughened pane in a uPVC back door, cleared and reglazed with a new unit in the door that was already there.
Read case studyParts
Most parts, for most systems.
Hardware is more standardised than it looks. A mechanism is matched on its backset, centres and faceplate rather than on the badge on the window, which is why we can repair systems we did not fit and systems nobody sells any more.
Window repairs
- Window mechanisms and locks
- Window hinges and friction stays
- Window handles, all finishes
- Sash adjustment and realignment
- Weather seals and gaskets
Door repairs
- Door realignment, single and French
- Patio and bifold realignment
- Door handles and backplates
- Door hinges
- Sill repairs
Locks and security
- Door gearboxes and multi-point locks
- Euro and rim cylinders, keyed alike
- Gaining entry after a lockout
- Making a door safe after a break-in
Glass and sealed units
- Misted and broken sealed units
- Cat and dog flaps, into glass or panel
- Written glazing surveys and reports
Repair or replace
A repair is usually right. Sometimes it is not.
On a sound frame the hardware and the glass are the parts designed to be replaced, and they cost a fraction of the window. What we will not do is take the money for a repair we can see will not hold.
Repair
- The frame is straight and the welds are sound
- The fault is hardware or glass
- One or two windows, not the whole house
Replace
- Sashes distorted or welds opened
- The same fault has come back before
- Most of the windows are failing at once
Misted or broken glass
If it is the glass, the frame stays.
A failed sealed unit is measured and changed on its own.
Replacement glazed units
How it works
Most of it happens before anyone visits.
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01
Tell us what it is doing
In your own words, with a photograph if you can.
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02
We price it, usually remotely
Most faults the office can diagnose and quote by phone or email.
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If it needs looking at, we come
Free of charge, and you get the figure before you decide.
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04
We fix it, or say why not
If a part is genuinely obsolete you will hear that rather than a guess.
Product questions
FAQs about Window and Door Repairs
How much does a window or door repair cost?
Repairs start from £96 including VAT. The price depends on which part your window or door needs, and you will know the exact figure before any work begins. Nothing changes on the day without a conversation. Tell us what it is doing, send a photograph if you can, and we will come back to you.
Do you charge to come out and quote a repair?
No. Quoting is free. Most faults we can diagnose and price without coming out at all, from a description and a photograph or two, and where it does need looking at, that visit is free as well.
Do you repair windows and doors you did not fit?
Yes, and most of our repair work is exactly that. We fit uPVC, aluminium and composite systems every week, so we know the hardware other installers use. The only real limit is parts: on a very old system the gear may no longer be made.
My double glazing has gone misty. Is that a repair?
It is a glass job rather than a hardware one. The seal around the double glazed unit has failed and moisture is in the cavity, which cannot be dried out, but the glass changes on its own and the frame stays. See our replacement glazed units page for how that works.
Can you still get parts for an older window or door?
Usually. Hardware is more standardised than it looks, and a mechanism is matched on backset, centres and faceplate rather than on the brand of the window. Where a part genuinely is obsolete we will tell you, and we will say what the alternatives are rather than leaving you with a window that does not lock.
Should I repair it or replace the whole window?
Repair, if the frame is sound and the fault is hardware or glass, because those are the parts designed to be replaced. Replace, if the frame itself has gone: distorted sashes, failed welds, or a window where you would be repairing the same thing again next year. We will tell you which one you have.
Do you cover Milton Keynes and the surrounding area?
Yes. We are based on Alston Drive in Bradwell Abbey and cover Milton Keynes, Buckinghamshire, Bedfordshire, Northamptonshire and Hertfordshire.
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
3 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
3 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
2 months 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
4 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 GoogleBook a repair
Tell us what it is doing.
In your own words is fine, and a photograph of the fault tells us more than any description will. We will come back with what it usually turns out to be.
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