Written by Mark Reid,
Trades Editor ·Verified 23 September 2026
Cardiff's housing stock throws up a fair bit of variety for window installers to deal with. You've got the bay-fronted Victorian terraces around Roath and Canton needing sympathetic sash or timber-look replacements, the 1930s semis in Rhiwbina and Whitchurch with their original steel-framed windows long past their best, and newer builds out towards St Mellons or Pontprennau where it's more about double or triple glazing upgrades and snagging issues. Coastal exposure around Penarth and the Bay also means installers there deal with more weathering and salt-air wear than you'd see further inland. Whatever the job, most homeowners are looking at uPVC, aluminium or composite doors and windows, and pricing swings a lot depending on the property's age and how many openings need doing.
The businesses listed here come from public business listings, ranked mainly by review rating and how many reviews they've built up, with a small boost given to those showing a working website and phone number. We then check each business's homepage ourselves to confirm window installation is genuinely what they focus on, which stops general builders or unrelated trades sneaking onto the page. Any listing flagged as permanently closed gets removed automatically, so what you're seeing should reflect businesses still trading. Where you spot a Trust Verified badge, that business has gone through our fuller verification process covering trade qualifications, public liability insurance, trading history, customer review history and registered company details, and you can read exactly what that involves on our How We Verify page. For businesses without that badge, those checks haven't been done by us, so it's down to you to look into them before booking.
Before signing anything, ask to see FENSA or CERTASS certification, since that's what confirms the work meets building regulations without you needing a separate council sign-off. Get a written quote that breaks down the frame material, glazing spec (U-values matter more than people think for energy bills), and whether old frames and any asbestos-containing materials will be disposed of properly. It's worth asking how long the guarantee covers and whether it's insurance-backed, because installer guarantees are only as good as the company still being around in ten years. Getting two or three quotes isn't just about price comparison, it also gives you a feel for which installer actually measured properly and asked sensible questions about your property rather than rushing the visit.
How We Select & Rate The Best Window Installers in Cardiff
Rankings are driven mainly by review rating and review count pulled from public business listings, with a small lift given to businesses showing a working website and phone number. We check each business's homepage to confirm window installation is what they primarily do, and listings flagged as permanently closed are removed automatically. Businesses marked Trust Verified have gone further, passing our full verification covering trade qualifications and accreditations, public liability insurance, trading history, customer review history and registered company information (see our How We Verify page for the complete list). Other businesses on this page haven't been independently verified by us, and their inclusion isn't an endorsement. Always do your own checks before hiring anyone.
Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →
Window installation and glazing services covering Cardiff and the surrounding area, MK Glazing Ltd holds a five-star rating from 85 Google reviews. The company operates from the CF23 postcode, placing it well for eastern Cardiff and neighbouring districts. Residential and commercial customers can request quotes directly through the company website.
Fitters Rates Ltd is a window installation company serving Cardiff and the surrounding area. Based within the CF24 postcode, the company focuses on fitting windows for residential properties across the city. Straightforward pricing and a local focus give it a practical appeal for Cardiff homeowners looking for reliable glazing work without the overhead of a national firm.
Window installation across Cardiff and the surrounding area is the core work of Centric Home Improvements Limited. The company fits replacement windows for domestic properties, covering a postcode range that extends into CF39. With a focused specialism rather than a broad trade offering, it suits homeowners looking for a straightforward, single-trade contractor.
Specialising in window repairs rather than full replacements, Chris Rice Window Repairs serves Cardiff with a focused offering that suits homeowners looking to extend the life of existing frames and glazing. Based in CF24, the business holds a 4.5-star Google rating from 27 reviews, suggesting consistent, reliable workmanship across the local area.
Residential and commercial properties across Cardiff are the focus of Renewable Green Homes Ltd, a window installation company based in CF24. The business carries a Google rating of 4.6 from 19 reviews, reflecting consistent work across its local client base. Services cover the supply and fitting of windows for both new builds and existing properties.
Transparency notice: Recommended and Featured listings are paid placements, so a business's fee affects whether and where it appears. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →
Is your business missing?
Get listed and reach customers actively searching for your services in this area.
A single uPVC window replacement in a standard terrace typically runs from around £400 to £700 fitted, while a full house re-glaze for a three-bed semi (say 8 to 10 windows) often lands somewhere between £4,000 and £7,000 depending on frame material and glazing spec. Aluminium and timber-effect composite frames cost more, sometimes 30 to 50% above equivalent uPVC. Older properties in conservation areas like Pontcanna or parts of Roath may need slimline double glazing or timber sash replacements to satisfy planning restrictions, which pushes the price up further. Getting two or three quotes is standard practice and will show you quickly if one price is out of line.
Do I need planning permission to replace windows in Cardiff?
Most window replacements fall under permitted development and just need to meet Building Regulations, confirmed through a FENSA or CERTASS certificate rather than a formal planning application. The exception is if your property is listed or sits in a conservation area, such as parts of Pontcanna, Cathays or the Cardiff Bay conservation zones, where the council may restrict frame materials or window style. If you're unsure, a quick call to Cardiff Council's planning department or a check with your installer before work starts will save headaches later.
How long does a window installation take?
A straightforward single window swap usually takes an installer half a day, including removing the old frame and making good the plaster around the reveal. A full house re-glaze on a typical semi is often completed within one to three days depending on how many openings there are and whether any structural work, like widening an opening for a bay window, is involved. Bad weather can push timings back slightly for outdoor sealing work, so it's worth building in a bit of flexibility around the quoted schedule.
What's the difference between FENSA and CERTASS certification?
Both are competent person schemes that let installers self-certify their work meets Building Regulations without needing separate council building control sign-off, and both are recognised across Wales including Cardiff. FENSA is the older, more widely known scheme, while CERTASS covers a similar scope. What matters practically is that your installer is registered with one of them and provides a certificate after the job, which you'll need if you ever sell the property, since conveyancing solicitors ask for it.
Should I choose uPVC, aluminium or timber windows?
uPVC is the most common choice in Cardiff for cost and low maintenance, suiting most 1930s to 1990s housing without much fuss. Aluminium suits newer builds or extensions where slim sightlines matter, and it holds up well against coastal weathering if you're near Penarth or the Bay, though it costs more upfront. Timber or timber-effect composite tends to come up for period terraces in Roath, Canton or conservation areas where planning rules favour a traditional look, but it needs more upkeep over the years. The right choice really depends on your property's age, budget and how much maintenance you're prepared to do.
How do I choose between window installers in Cardiff?
Start by checking whether the installer is FENSA or CERTASS registered, since that confirms their work is compliant without extra paperwork on your end. Ask to see examples of similar jobs they've completed nearby, ideally on a property of a similar age to yours, and read through recent customer reviews rather than just the overall star rating. Confirm what guarantee is offered and whether it's insurance-backed, so you're covered if the company stops trading. Finally, get written quotes from at least two or three installers before deciding, and don't be afraid to ask direct questions about glazing U-values, frame warranties and disposal of old materials, since how clearly they answer tells you a lot about how the job itself will go.
Related Guides
More independently researched rankings you might find useful
