Double glazing quotes in Swansea
Compare free written quotes from local installers who cover your SA postcode, for uPVC, timber and aluminium windows, sealed units and repairs. Swansea's homes are older than Cardiff's and many face the open sea, so the right quote fits both the house and the weather.
26.4% of Swansea homes were built before 1919 (VOA, March 2026)
- Local installers who cover Swansea and Gower postcodes
- Sash and casement options quoted side by side
- Free, with no obligation to accept a quote
How it works
How to get double glazing quotes in Swansea
You fill in one form. Local installers who cover your postcode contact you to survey and quote.
Tell us the job
House type, how many windows, the frame you want and your timing. Mention bays, sashes and sea-facing sides.
Confirm by phone
A quick call checks the details, then your enquiry goes to local installers who cover your SA postcode.
Survey and compare
Each installer measures and quotes in writing. Compare the energy rating, BS 6375-1 classes and certification scheme.
What installers quote for
What can you get quoted for in Swansea?
Swansea quotes cover new windows, new glass in old frames and repairs, with sash and bay styles common on the city's pre-1919 streets. Pick the job that matches your house:
- uPVC windows: casement, tilt and turn or sash-style, the most common replacement
- Timber or wooden windows: box sash and heritage casements for bays and period fronts
- Aluminium windows: slim frames, often asked for on modern and seafront homes
- Sealed-unit replacement: new glass for misted panes where the frame is still sound
- Repairs: corroded hinges, stiff handles and worn seals, which sea air wears first
Doors are a separate job: ask the installer whether they fit composite or uPVC doors before the survey.
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Local factors
What changes a Swansea double glazing quote
Six things change a Swansea double glazing quote: the age of the house, its energy rating, sea exposure, conservation controls, listed status and the Welsh window standard. Tell each installer which apply before the survey.
| In Swansea | What it changes in your quote | Ask or check |
|---|---|---|
| 26.4% of homes built before 1919VOA | Sash and bay openings, many already replaced once | A heritage profile next to a casement |
| 19.5% of pre-1929 homes reach EPC CONS | Replacement earns its place on these homes | The WER or U-value of each window |
| Open sea on Swansea Bay and GowerBS 6375-1 | More wind-driven rain and salt on frames and hinges | BS 6375-1 classes and coastal-rated hardware |
| 31 conservation areasSwansea Council | Article 4(2) controls on selected Ffynone and Uplands homes | Whether your house is covered |
| 512 listed buildingsCadw | Listed building consent for window changes | Photos of similar Swansea jobs |
| U-value 1.4 or WER band BApproved Document L, Wales | Every new window must reach it | FENSA or CERTASS registration |
Exposure
Coastal window quotes for Swansea Bay and Gower
Homes along Swansea Bay and the Gower face open sea, which puts more wind-driven rain and salt on a window than an inland street does. Frames, seals, hinges and handles take the wear first.
The UK classifies windows for this under BS 6375-1, which rates air permeability, watertightness and wind resistance. For a seafront or hillside elevation, ask:
- Which BS 6375-1 classes do these windows reach?
- Are the hinges, handles and frame finish rated for a coastal site?
- What does the guarantee say about salt corrosion on hardware?
Get the answers in writing on the quote, not just in the conversation.
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Swansea homes
Replacement windows for Swansea's older homes
More than a quarter of Swansea's homes date from before the First World War. The Valuation Office Agency counts 26.4% of Swansea properties built before 1919 and 18.7% before 1900 (31 March 2026). Across Wales the pre-1919 share is 30.1%.
Most of those houses started life with timber sash or casement windows, often in bays. Ask each installer to quote a sash-style or heritage-profile window next to a standard casement, and ask whether they survey bay and box-sash openings themselves.
Energy ratings on Swansea quotes
Swansea's pre-1929 homes are the least efficient in its stock: only 19.5% of those with an EPC reach band C or above (ONS, to March 2025). Across all Swansea homes with an EPC the figure is 46.8%, close to the Welsh 47.3%.
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Heritage
Window quotes for Swansea conservation areas and Article 4 homes
Swansea Council states there are 31 conservation areas in the City and County of Swansea. Cadw lists 512 buildings in the county (8 grade I, 42 grade II*, 462 grade II), and window changes on a listed building need listed building consent.
Ffynone and Uplands has its own control. An Article 4(2) direction has applied to selected properties in the Ffynone and Uplands Conservation Area since 19 March 2018. Check with the council whether your house is one of them before you choose a new style.
If your home is in a conservation area, ask installers for photos of similar Swansea jobs, and read our guide to sash window replacement before you pick between restoring and replacing sashes.
Get Swansea heritage window quotesFree, no obligation
Welsh rules
Who certifies window work in Swansea
A FENSA or CERTASS registered installer certifies replacement windows in Swansea, as in the rest of Wales. FENSA calls itself a "government-authorised scheme that monitors building regulation compliance for replacement windows and doors" in England and Wales.
The windows themselves follow the Welsh Approved Document L, Table 10.1: a U-value of 1.4 or WER band B. The 2026 Welsh edition, in force from 4 March 2027, keeps that figure. Our page on double glazing quotes in Cardiff covers the Welsh standard in more detail.
Get Welsh-standard window quotesFree, no obligation
Repair or replace
Repair or replace your Swansea windows?
Replacing 20 year old double glazing is worth it when the frame has rotted, warped or no longer closes tight; when only the glass, seals or hardware have failed, a repair keeps the window in service. On the coast, hinges and handles often corrode years before the frame does.
A misted pane is a failed sealed unit, not a failed window. The unit swaps into the existing frame, so glass-only replacement is a common standalone job in Swansea. Many pre-1919 houses here already carry a first round of replacement windows, so ask the surveyor how old yours are and whether the frames are worth keeping.
Check four things before you decide:
- Look for misting between the panes, which points to a new sealed unit.
- Open each window and test the hinges, handles and locks.
- Press the frame corners for rot, cracks or movement.
- Ask for the U-value of a new window against your current one.
Replacement earns its place on the least efficient homes, so ask for a repair price and a full replacement price on the same quote.
Get Swansea repair quotesFree, no obligation
Before they quote
Checking a Swansea installer before they quote
Check a Swansea installer in five steps before the survey, including one a friend or neighbour recommends:
- Search the company on the FENSA or CERTASS register yourself, not just the logo on its van.
- Look it up on Companies House to confirm it is active and trades under the name on the quote.
- Ask where the firm is based. Several firms with Swansea web pages are based in Bridgend, Maesteg, Carmarthen or Cross Hands, so ask how far they travel for aftercare.
- Ask whether its own staff fit the windows or a subcontractor does.
- Ask whether the guarantee and your deposit are insurance-backed, and what the guarantee says about coastal hardware.
Our guides on double glazing deposits and what to do if a double glazing company goes bust explain why that cover matters. If you sign at home, you usually have at least 14 days to cancel, but made-to-measure windows can be an exception, so check the contract before you sign. The double glazing cooling-off period guide has the detail.
Swansea Council Trading Standards has warned residents about doorstep callers and leaflet droppers (January 2023). Book your own surveys and never sign on the doorstep. Take our list of what to ask a double glazing salesman to each one.
On paper
What a Swansea double glazing quote should include
A Swansea quote should name the certification scheme, the guarantee and the spec of every window, so three quotes line up. Use our guide on how to compare double glazing quotes to set them side by side. Then check the one you choose against our checklist for a double glazing contract before you sign.
The windows
- Each window with size, style, material and opening panes
- The U-value or WER of each window
- BS 6375-1 classes for sea-facing sides
- Coastal-rated hinges, handles and finish
The firm and the paperwork
- FENSA or CERTASS scheme and registration name
- Guarantee length, type and who backs it
- Own fitters or subcontractors
- Deposit amount and cancellation terms
Areas
Areas this page covers in Swansea
This page is about homes across the City and County of Swansea, by postcode district:
- SA1: city centre, Maritime Quarter, St Thomas, Mount Pleasant, Townhill, Landore, Bonymaen
- SA2: Uplands, Sketty, Brynmill, Killay, Dunvant, Cockett
- SA3: Mumbles, Oystermouth, West Cross, Langland, Bishopston, South Gower
- SA4: Gorseinon, Gowerton, Loughor, Penllergaer, Pontarddulais, North Gower
- SA5: Fforestfach, Manselton, Penlan, Gendros, Waunarlwydd
- SA6 and SA7: Morriston, Clydach, Ynystawe, Llansamlet, Birchgrove, Glais
These are the places the page is about, not a coverage promise. Enter your postcode in the form and the confirmation call tells you whether a local installer covers it.
Related guides and areas
FAQ
Swansea double glazing questions
Who will contact me after I ask for quotes?
You get a quick call first to confirm the job. Local installers who cover your postcode then contact you to arrange a survey and a written quote.
Are there any government grants available for double glazing in Wales?
Windows are not on the list of improvements on the home page of Nest, the Welsh Government's Warm Homes scheme, which lists heat pumps, insulation and solar panels.
Can I fit uPVC windows in a Swansea conservation area?
Check with Swansea Council before you order. The answer depends on whether your house is listed and whether an Article 4 direction, such as the one for selected properties in Ffynone and Uplands, covers it.
Do Swansea installers need to be FENSA registered?
A Swansea installer registered with FENSA or CERTASS self-certifies replacement windows and registers the job for you. Ask which scheme each installer uses and check it on the scheme's register.
Can I replace just the misted glass in my Swansea windows?
Yes, a new sealed unit fits into a sound frame. Ask each installer to price glass only and full replacement as separate lines.
Is it worth replacing 20 year old double glazing?
Replacing 20 year old double glazing is worth it when the frames have rotted, warped or no longer close; misted units, worn seals and corroded hinges in a sound frame are repairs. Ask each Swansea installer to price both on the same quote.
What are the disadvantages of double glazing?
Double glazing's disadvantages are the upfront cost, sealed units that mist once their seal fails, and new frames that can look wrong on a period house. In Swansea, window changes on a Cadw-listed building need listed building consent, and an Article 4 direction covers selected homes in Ffynone and Uplands.
What is the average cost of double glazing windows in the UK?
The average for your home is the price on written quotes, which depends on the number of windows, their size, the frame material and the glass, and our sister site sets out what double glazing costs in each UK region.
How much will double glazing cost in the UK in 2026?
The 2026 cost of your job is the figure on written quotes for your own windows, so ask at least three Swansea installers to price the same spec.
Get Swansea quotes for your house and your view
Ask for the same spec from each installer, sash or casement, and compare. Read how to choose a double glazing installer, or go back to compare double glazing quotes.
Get free Swansea quotes
Sources
- VOA, Council Tax: stock of properties 2026, table CTSOP4.1: gov.uk
- ONS, EPC band C or above, England and Wales, tables 2a and 2c: ons.gov.uk
- FENSA, About FENSA: fensa.org.uk
- Welsh Government, Approved Document L volume 1, Table 10.1: gov.wales; 2026 edition: gov.wales
- Swansea Council, conservation areas: swansea.gov.uk
- Swansea Council, Ffynone and Uplands Article 4 direction: swansea.gov.uk
- Cadw listed buildings via DataMapWales: datamap.gov.wales
- Nest (Welsh Government Warm Homes): nest.gov.wales
- Wikipedia, SA postcode area (district coverage): wikipedia.org
- Postcode districts: postcodes.io outcode lookup (ONS Postcode Directory), checked 2026-10-02
- Swansea Council, warning about rogue traders (18 January 2023): swansea.gov.uk