Coleraine Glass · Northern Ireland
Double Glazing UnitReplacement in Coleraine& Northern Ireland
Misted, cracked or blown units replaced by Coleraine Glass, so you get clear, warm windows back without replacing the whole frame.
15 years' experience · Free, no-obligation survey and quote
15 years
Supplying & fitting
Free survey
And written quote
Family-run
Based in Coleraine
Overview
Double Glazing Unit Replacement: what you need to know
What unit replacement is
A double glazing unit is the sealed pair of panes inside your window frame. When the seal fails, moisture gets in and the unit mists. Replacing just the unit restores clear glass without replacing the frame.
Who it's for
Anyone whose frames are in good shape but whose glass has misted, cracked or blown.
When it's needed
When you see condensation between the panes, a crack, or a unit that no longer keeps the cold out.
Why professional help matters
Units must be measured accurately and fitted into the frame securely so the window stays weathertight.
The cost of waiting
What happens if you leave it
A failed unit doesn't fix itself.
Common mistakes we see
- Replacing whole windows when only the glass has failed.
- Ordering units without accurate measurements.
- Ignoring a cracked pane until it breaks.
- Trying DIY removal and damaging the frame.
Our process
Five clear steps, start to finish
01
Get in touch
Call or send your details and tell us what you need: the replacement unit, the room and any photos you have.
02
Free survey and measure
We visit to measure accurately and check the surfaces or openings the glass will go into.
03
Written quote
You get a clear written quote with no hidden extras.
04
Glass made to size
Your replacement unit is made to the measurements taken at survey.
05
Fitting and handover
We fit, check and tidy up. Final payment is due on the day of completion.
Benefits
What you get
Clear glass again
No more fogged view.
Keep your frames
Avoid replacing windows that are still sound.
Warmer rooms
A sealed unit insulates properly again.
Made to size
Units made to your measurements.
Tidy fitting
Fitted and checked by our team.
Local
Based in Coleraine.
In detail
Options, materials and methods
Everything worth knowing before your survey, so you can make a confident decision.
Windows and doors
We replace units in windows and glazed doors.
Glass options
Clear, obscure and other glass types are available. We'll advise at survey.
Frames worth keeping
If your frames are in good condition, unit replacement is usually the sensible option. If they're not, we'll tell you honestly.
Signs your unit has failed
The most obvious sign is condensation or a milky film between the two panes that you can't wipe away from either side. Other signs are a draught you can feel near the glass, a crack in one pane, or a window that feels noticeably colder than the others in the same room. Any of these mean the sealed unit needs replacing.
Replace the glass, keep the window
Replacing a failed unit is often far less disruptive and less costly than replacing a whole window. The frame stays in place; the old unit is removed and a new one, made to your measurements, is fitted in its place. If we find the frame itself has had its day, we'll tell you honestly and explain the options.
Obscure and specialist glass
Bathrooms, front doors and side panels often use obscure glass for privacy. When replacing a unit we can match or change the glass type, so you can take the opportunity to improve privacy or brighten a room.
How quickly can it be done?
Units are made to size after we measure. We'll tell you the timescale with your quote and agree a fitting date when your unit is ready. If a pane is cracked, tell us when you call so we can advise on keeping the window safe in the meantime.
Before your free survey
To get the most from your survey, have a think about a few things beforehand: how you use the room day to day, the look you're aiming for, any colours or finishes you already like, and whether other building or decorating work is planned. Photos of styles you like are useful too. None of this is essential, as we'll guide you through every choice, but it helps us give you a precise double glazing unit replacement quote in a single visit.
What our customers tell us matters
Our one Facebook recommendation so far describes the installation as done professionally, fitted neatly, with a friendly and efficient team. That's exactly what we aim for on every job: turning up when we say we will, protecting your home while we work, fitting carefully, and leaving the room clean. If you've had work done by us, we'd be grateful for a Google review.
Paying for your project
We keep payment simple and transparent. A 65% deposit is taken to order your products from the manufacturer, and the balance is due on the day of completion, once the job is finished. We don't publish prices, because every home is different. Get in touch for a quote. Your written quote will show exactly what you're paying for.
Why choose Coleraine Glass
Coleraine Glass is the glass side of P Black and Son. Because we already supply and fit windows and doors across Northern Ireland, we measure, order and fit glass with the same care: accurate surveys, glass made to the size of your space, and a tidy finish. You deal with a local team based in Coleraine, not a call centre.
How to get an accurate quote
The fastest way to a firm price is a short call or message telling us what you need, the room it's for and roughly how big the area is. Photos help. We then arrange a free survey to measure properly, because glass is made to size and an accurate measurement is what makes it fit first time. You'll get a written quote before anything is ordered.
Planning around building work
If you're renovating, book the survey once walls, floors and worktops are finished. Measuring too early is the most common reason glass doesn't fit. If you're unsure of timing, call us and we'll tell you when to book the visit so your glass arrives ready to go in as soon as the room is ready.
Looking after your glass
Glass is one of the easiest surfaces in the home to keep clean. A soft cloth and a non-abrasive glass cleaner is all most jobs need. Avoid scouring pads and harsh chemicals, which can mark the surface or edges. If you're unsure about cleaning a particular finish, ask us at handover.
Glass alongside windows and doors
Many customers come to Coleraine Glass while having windows or doors fitted by P Black and Son, and some come the other way round. If you're changing more than one thing in your home, tell us at survey and we'll plan the work together so there's one set of visits and one point of contact.
Homes we work on
Our customers are mainly households: replacements in existing homes, renovations, extensions and self-builds. Coleraine Glass supplies products from manufacturers and fits them, so you deal with one team from first visit to final handover.
Where we work
Double Glazing Unit Replacement across Northern Ireland
Based in Coleraine on the north coast, we work across Northern Ireland and occasionally further afield.
- Double Glazing Unit Replacement Northern Ireland
- Double Glazing Unit Replacement Belfast
- Double Glazing Unit Replacement Lisburn
- Double Glazing Unit Replacement North Coast
- Double Glazing Unit Replacement Coleraine
- Double Glazing Unit Replacement Castlerock
- Double Glazing Unit Replacement Portrush
- Double Glazing Unit Replacement Portstewart
- Double Glazing Unit Replacement Ballymoney
- Double Glazing Unit Replacement Limavady
- Double Glazing Unit Replacement Ballymena
- Double Glazing Unit Replacement Ballycastle
Questions
Double Glazing Unit Replacement FAQs
Is Coleraine Glass part of P Black and Son?+
Coleraine Glass is our sister business, handling glass supply and replacement on its own.
Can you replace just the glass?+
Yes, if the frame is in good condition.
Why is my window misting between panes?+
The unit's seal has failed and moisture has got in. The fix is a replacement unit.
Do you replace glass in doors?+
Yes. We replace units in glazed doors as well as windows.
How much does double glazing unit replacement cost?+
Every job is priced individually because sizes, finishes and site conditions vary. Your survey and written quote are free and come with no obligation, so you'll know the exact cost before you commit.
How does payment work?+
A 65% deposit is taken to order your products, with the balance due on the day the job is completed.
How long does the whole process take?+
Products are made to order after your deposit is placed. We'll give you a realistic timescale with your quote and agree a fitting date once your order is ready.
Do you offer an emergency service?+
Call us on 028 7071 0015 and we'll tell you honestly how quickly we can help.
Do you cover my area for double glazing unit replacement?+
We're based in Coleraine and cover all of Northern Ireland, including the North Coast, Coleraine, Castlerock, Portrush, Portstewart, Ballymoney, Limavady, Ballymena, Ballycastle, Belfast and Lisburn: we work across Northern Ireland and occasionally further afield.
Can I visit your showroom?+
Yes. Our showroom at 29 Altikeeragh Road, Coleraine is open by appointment only. Call us to arrange a time.
Get your double glazing unit replacement priced, free
A free survey and written quote, with no obligation. 15 years' experience, one family team from survey to handover.