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★★★★★ 4.9 from 278 Google reviewsFENSA registeredSwansea based

Why choose us

Choosing a glazing partner isn’t just about picking a frame profile or glass unit. It’s about trusting a team to work in your home, keep promises and leave you with windows and doors that feel right every day.

★★★★★4.9 from 278 Google reviews
  • FENSA registered
  • 10-year insurance-backed guarantee
  • Fully guaranteed and insured
  • Our own fitting team
  • FCA authorised credit broker
  • 4.9 on Trustpilot495 reviews

As a family run double glazing company, we install with our own people, keep the paperwork honest and back everything with a straight-talking 10-year insurance-backed window guarantee. Add our status as FENSA registered installers, and you get neat, compliant work that’s designed for Welsh weather and carried out with care — no pressure, no gimmicks.

FENSA registered installers — compliance and confidence built in

FENSA is your assurance that:

  • Your installation meets current Building Regulations (thermal, safety and ventilation).
  • Work is carried out by assessed professionals who self-certify correctly.
  • You receive a FENSA certificate for future home sales.

Our surveyors design to the regs; our fitters install to them; our office registers your job promptly so the paperwork arrives without chasing.

A 10-year insurance-backed window guarantee that’s easy to understand

Promises shouldn’t need a magnifying glass. Our 10-year insurance-backed window guarantee covers frames, sealed units and installation workmanship as standard. We explain what’s included in plain English, outline any manufacturer-backed elements, and give you a single phone number to call if you ever need us. No run-around, no “that’s the supplier’s problem”.

Our own trained fitters — no anonymous subcontracting

Quality comes from accountability. We use our own installers so we can maintain the standards we promise:

  • Respectful conduct in your home, with clean protection and end-of-day tidy-ups.
  • Frames set level, plumb and square so sashes, locks and seals work smoothly.
  • Correct packers and fixings matched to brick, block or stone.
  • Continuous internal air-seals and weatherproof external finishing.

That’s how your A-rated spec on paper becomes genuine warmth and quiet in daily life.

Heritage sensitivity without sacrificing performance

From sash replacements on period streets to flush sash and timber-look profiles, we balance character and comfort. Expect slim sightlines, authentic bar patterns and wood-effect foils where they suit the façade, paired with low U-values, warm-edge spacers and acoustic options where traffic noise bites.

Products we trust, specified for your property

We select proven systems for uPVC windows, composite doors, sliders and aluminium bi-folds, then tailor the build to your rooms:

  • Low-E coated glass with argon fill and warm-edge spacers.
  • Multi-chamber frames or thermally broken aluminium.
  • Acoustic laminates for front bedrooms or home offices.
  • Security upgrades (laminated panes, anti-snap cylinders, hinge protection).

Every choice has a purpose, and we’ll explain it in plain English.

Installation method that protects performance for the long term

Great hardware underperforms when the fundamentals are off. Our fitters focus on:

  • True frames that protect hinges and keeps from premature wear.
  • Toe-and-heel glazing on large sashes and doors so they don’t drop.
  • Tidy thresholds and drainage details that shed water cleanly.
  • Colour-matched trims and sealants for a “designed-in” finish.

You’ll feel the difference the first evening you close the windows.

Tidy, low-disruption work on site

We plan sequencing room by room, agree access each morning and keep walkways clear. Old frames and glass leave with us; we recycle where possible. If weather calls for a change of plan, we’ll explain and keep you comfortable.

Energy, noise and security — results you can notice

  • Warmth: low U-values plus airtight fitting remove cold corners and draught paths.
  • Quiet: acoustic laminates and asymmetric build-ups cut road noise where it matters.
  • Security: multi-point locks, reinforced keeps and laminated glass provide robust protection without bulky ironmongery.

We’ll show you where each upgrade earns its keep — room by room.

Conservation and planning — sympathetic advice

Most like-for-like replacements don’t need permission, but streets with character often demand sensitivity. We propose sympathetic colours, profiles and glazing patterns, and we’re happy to coordinate with conservation officers where needed.

What customers say

Rated 4.9 out of 5 on Google and Trustpilot

4.9
★★★★★278 Google reviews
FENSA approved window and door installations
Posted on Google Google
Steve Young profile picture
Steve Young
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
No fuss quote, work carried out on time, great job, polite friendly team & left everything clean & tidy. Have recommended to my friends.
Posted on Google Google
Nigel Jenkins profile picture
Nigel Jenkins
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
We had our windows and doors replaced by Sureseal Windows and could not be happier. We had a home visit from the salesman, who went through the various designs and colours available plus an initial measurement of all the items needed. Following our agreement to purchase the doors and windows a supervisor visited to precisely measure the openings and look for any issues that might arise during the install. The fitting was booked in about 10 weeks later. Alan contacted us to give his ETA of the morning of the start of the job. And we cannot praise Alan enough for his work and cleaning up after. All areas where work was done were covered with dust sheets and no mess was left. There were a couple of remedial jobs to be completed when the parts were available. Sean completed these jobs for us over a coarse of a morning. And, as with Alan previously Sean's work was great and all was cleaned up on completion. Both workers are a credit to SureSeal. And we highly recommend the Company.
Posted on Google Google
shirley powell profile picture
shirley powell
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Absolutely amazing service, with price and installation, very clean when he finished,
Posted on Google Google
MIck Hedges profile picture
MIck Hedges
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
From initial call from Sureseal making appointments to choosing our windows all the team have been very knowledgeable and helpful, No big sell to get the costs up just what we wanted and even reduced aspects no of closers etc. to meet requirements. Plenty of payment options with full explanation again no push either way. Survey was again very straightforward and with some discussion even more savings found. Pleasure to do business with. Great service and very knowledgeable.will post photos of finished project once complete. Mike Hedges
Posted on Google Google
Adam Wisniewski profile picture
Adam Wisniewski
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Excellent company. Got all windows and doors installed professionally, as agreed and on time. Very good quality product professionally installed. Will always recommend
Posted on Google Google
Dolores Furlong-Martin profile picture
Dolores Furlong-Martin
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
We had all new windows and doors from sureseal. A very skilled fitter installed them. We had a couple of issues after but were resolved immediately. Would certainly recommend this company from start to finish a great job and a very happy customer
Posted on Google Google
Sarah Thomas profile picture
Sarah Thomas
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Extremely efficient, professional and helpful company. Exemplary fitter. Would highly recommend and have already done so!
Posted on Google Google
Sam Rowe profile picture
Sam Rowe
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Would definitely recommend Sureseal, especially the service engineers who have been very helpful and professional!
Posted on Google Google
Michael Curling profile picture
Michael Curling
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Sureseal windows has completed installation of my windows to a very high standard with excellent work by the lone installer who was very organised and polite and completed within the time frame quoted I highly recommend this firm
Posted on Google Google
Livia Toth profile picture
Livia Toth
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Sureseal windows all team very good. Customer service always available, helpful and professional. Alan very kind, polite and professional. He knows what he is doing and working hard. I am above and beyond. Thank you so much.
Rated Excellent on Trustpilot: TrustScore 4.9 from 495 reviews

Your free quote

Your free quote.

Tell us a little about your home and we will call to talk it through and arrange your free survey.

  • Quick and free. Just your name, number and postcode.
  • A friendly chat, not a sales pitch. We’ll call to talk through your project and answer your questions, then arrange your free home survey.
  • Prefer to ring us? Call free on 0800 233 5576, Monday to Friday 9am to 5pm.

Get your free, no-obligation quote

Leave your name, number and postcode and one of our local team will call you to arrange your free home survey.

★★★★★“Extremely efficient, professional and helpful company.”Sarah Thomas, Google review · 4.9 from 278 reviews

Questions

Your questions, answered

What proves you’re FENSA registered?

We provide your FENSA certificate after completion; you can verify registration online. It’s the document solicitors ask for during a house sale.

Are guarantees transferable if I sell?

Yes — our core 10-year insurance-backed window guarantee is designed to support future sales; we’ll explain any registration steps.

Can you mix double and triple glazing in one home?

Absolutely. We often specify triple for front bedrooms or exposed elevations and high-spec double elsewhere for best value.

Do you repair as well as replace?

Yes. If a hinge, handle or sealed-unit swap will restore performance, we’ll recommend repair first.

How tidy is the work?

Floors protected, waste removed daily, and a final clean-down. We treat homes like homes, not building sites.

Ready to talk about your home?

Leave your details and one of our local team will call you, or ring us free on 0800 233 5576.

★★★★★4.9 from 278 Google reviews
★★★★★4.9 from 278 Google reviews
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