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

Double glazed windows

Made to measure, fitted by our own team, with a free home survey and a clear written quote.

Get my free quote →Call free 0800 233 5576

★★★★★4.9 from 278 Google reviews

White uPVC casement windows with a bay window

Styles to suit every property

Double glazing is a technology — not a “look”. You can have the performance in any of these styles:

Casement windows: the dependable all-rounder, available in sculptured or chamfered profiles.
Flush sash: timber-look elegance with sashes that close level to the frame.
Sliding sash: heritage charm with smooth, modern operation.
Tilt & turn: inward tilting for safe night ventilation and easy cleaning.
Bay & bow: more light and space with A-rated performance built in.

If you’re mixing styles, we’ll keep colours, bars and hardware consistent so the whole elevation feels coherent.

What makes our double glazed windows energy efficient

Energy performance is a system, not a single component. We specify:

Insulated frames: multi-chamber uPVC sections slow conductive heat transfer.
Thermally efficient double glazing: sealed units with argon fill to reduce heat movement.
Low-E coatings: reflect heat back indoors without darkening rooms.
Warm-edge spacers: reduce cold bridging and cut edge condensation.
Airtight installation: correct packers, fixings and continuous seals to stop draught paths.

Together these deliver the stable temperatures most homeowners notice within days of installation.

Double glazing vs triple glazing — finding the sweet spot

Triple glazing adds another pane and cavity, which can help in exposed or high-noise locations, but it increases weight and cost. We often propose a targeted approach: triple in the rooms where you’ll feel it most (front bedrooms, nursery), double elsewhere for balance.

Glass options to fine-tune each room

Your glass can solve everyday challenges:

Acoustic laminates for busy roads or flight paths.
Solar control tints to tame glare in south- and west-facing rooms.
Privacy patterns for bathrooms and overlooked windows.
Safety glazing (toughened/laminated) where regulations or security require it.

We specify room-by-room so you get the right light, privacy and quiet in each space.

Colours, finishes and details

Go classic or contemporary:

Colours: White and Cream for timeless looks; Anthracite, Slate and Black for modern contrast; heritage tones for period calm.
Wood-effect foils: Golden Oak, Rosewood, Irish Oak and more for convincing timber character without upkeep.
Dual-colour: one tone outside, White inside to keep interiors bright.
Finishing touches: period or modern handles, neat trickle-vent solutions, equal sightlines and proportionate external cills.

Small choices add up to a “made for this house” feel.

Replacement double glazing — signs it’s time

Consider replacement when you notice:

Misted panes that don’t clear (failed seals).
Draughts around the frame perimeter.
Stiff or dropped sashes catching the frame.
Condensation at the edges of the glass.
Faded, pitted or warped frames and beading.

We’ll assess honestly: repair where it’s sensible, recommend replacement double glazing where it saves money and hassle long-term.

Our installation standards — where performance is won

Correct fitting is the difference between “on paper” and “in the room”. Expect:

True, plumb, square frames to protect hinge life and smooth operation.
Proper packers and fixings to avoid distortion.
Continuous internal and external seals for airtightness and weathering.
Tidy making-good with aligned trims and neat mastic lines.
FENSA certification and warranties on completion.

We work carefully and leave your home clean at the end of each day.

Double glazing installers you can trust

We’re a local team, not a call centre. That means:

One point of accountability from first survey to aftercare.
No hard sell — just clear options and itemised prices.
Responsive support for future adjustments, upgrades or maintenance.

If you’re comparing double glazing installers, ask to see survey notes, sample frames and glass options in natural light — it’s the surest way to choose well.

Double glazing finance — upgrades made manageable

Prefer to spread the cost? We can outline double glazing finance routes in plain English with sensible monthly options. Finance is particularly helpful for full-house projects or when combining windows with doors or roofline work. We’ll walk you through the details so you can decide comfortably.

More like this

Bay and bow windowsView →Sash windowsView →Heritage sliding sash windowsView →Halo flush sash windowsView →Tilt and turn windowsView →Energy efficient windowsView →Triple glazingView →Replacement windowsView →

What customers say

Rated 4.9 out of 5 on Google and Trustpilot

4.9

★★★★★278 Google reviews

FENSA approved window and door installations

      EXCELLENT  
   Based on 278 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Steve Young 
 
 
 
 Trustindex 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  
   
   Nigel Jenkins 
 
 
 
 Trustindex 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  
   
   shirley powell 
 
 
 
 Trustindex 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  
   
   MIck Hedges 
 
 
 
 Trustindex 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  
   
   Adam Wisniewski 
 
 
 
 Trustindex 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  
   
   Dolores Furlong-Martin 
 
 
 
 Trustindex 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  
   
   Sarah Thomas 
 
 
 
 Trustindex 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  
   
   Sam Rowe 
 
 
 
 Trustindex 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  
   
   Michael Curling 
 
 
 
 Trustindex 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  
   
   Livia Toth 
 
 
 
 Trustindex 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.

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

How long does a full-house installation take?

Most three-bed homes are completed in one to three days depending on access and any bay/structural work. We confirm timelines after survey.

Will new double glazing really make the house quieter?

Yes — better seals and modern unit design reduce general noise. Add acoustic glass in targeted rooms for a bigger improvement.

Can you match my existing door colours and roofline?

Absolutely. We coordinate window colours with composite doors, aluminium doors, fascias, soffits and guttering so the exterior reads consistently.

What U-value should I aim for?

We’ll recommend sensible targets for your property type and elevation. In practice, strong A-rated configurations with low U-values are achievable without bulky frames.

Do you remove and recycle the old units?

Yes. We remove all waste and dispose of it responsibly as part of the service.

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.

Get my free quote →Call free 0800 233 5576

★★★★★4.9 from 278 Google reviews