uPVC Windows

Supply & Installation

of uPVC, Aluminium & Wooden Windows


Experienced Window Fitters.

Seamless Installation.

Competitive Prices.


Aluminium Windows

Aluminium Windows

Replacement and Restoration


Supply & Fit or Replace Service.

Friendly & Experiened Team.

Free Job Estimates.


Wooden Sash Windows

Traditional Wooden

& uPVC Sash Windows

Replacement and Restoration


Supply & Fit or Installation Service only.

Work Insured & Guaranteed.

100% Satisfaction.


Windows London Installers

The installation of new replacement windows is just as important as the quality of the window itself. Purchasing a premium window is only half of the battle; an improper installation could result in building code violations, air infiltration, may void the manufacturer’s warranty and more important, water infiltration that could damage the structure of our home. 

Our window installation crews only install windows, nothing else. 
  • The average more than 16 years of window installation experience 
  • Last year the received an average of 23 hours of continuing training on window installation 
  • And the installed nearly 750 windows per crew 
A great window is only great if it is installed properly. So many homeowners overlook the installation process as they focus too much on the actual window itself. At ATLASS London Ltd, an amazing 25% of our business is replaying replayement windows. There are so many inferior windows on the market and then adding in poor installation can only result into major issues. How would you feel if you have had to pay for new windows twice? 

Having said that, all of our windows are installed by factory trained Soft-Lite installers that are certified through the installation master's program. You will never have to worry about improper installation or voided warranties. So many companies out there use poorly trained installers that aren't window professionals, moreover a jack of all trades. All of ATLASS London Ltd installers are full-time, dedicated windows installers. 

Lastly, for your peace of mind, all of ATLASS London Ltd factory trained installers have gone through extensive background checks and are subjected to random drug testing.

Windows Restoration or Replacement?

Most of us are probably tired of reading about governmental cuts and the much debated spending review of the recent weeks, but there's no doubt that saving money will still be at the back of everyone's minds. With the entire country tightening its belt, it's only natural to be thinking about how to save a few pounds in the short term, and this article questions which would be the better route for homeowners, with old or damaged sash windows, to take; restoration or replacement. It's a timely question, the answer for which has far reaching implications for you and your family. 

At first glance, repairing your windows or having a local handyman may seem like the most logical and cost effective solution - in a relatively short time you can have your windows working properly again. However, as specialists in manufacturing precision sashes, most established teams would advise against the continual renovation of older windows. 

While some contractors may be fully conversant with common casement windows, sash windows are notoriously complex and require attention from properly trained professionals; otherwise you may find your repaired windows are draughty, misshapen and return to their poor condition in a short space of time. 

Though it costs slightly more overall, if the right windows are chosen replacement is the option with a greater return. Not only can some new sashes recreate traditionally genuine aesthetics, they also come with extensive and long lasting guarantees. 

This means that the provider has confidence that they'll last until long after the current economic difficulties have passed, and won't require propping up with continual investment over the coming years. New sash windows are also more eco - friendly, and therefore represent a purchase which is in keeping with contemporary and expected future efforts to reduce climate change.

Double or Triple Glazing?

Triple-glazing is often marketed as a better option than double-glazing. While it’s true that triple-glazing does offer some benefits, it may not be the best or most economical solution for you. Triple-glazing is what enables window manufacturers to achieve U-values of 1.0 and better.
But such U-values are really only of benefit where they fit into an overall energy saving build, such as in a low energy house or a passive house.

Where windows are being fitted into a standard build or as part of a refurbishment project then double-glazed units offering U-values as good as 1.1 are preferable. And other benefits such as noise-reduction and solar control can be included in double-glazing for less than the cost of a standard triple-glazed unit.

Fitting your new Sash Windows.

ATLASS London Ltd cover all stages of sash window ownership right through from fitting/installing (or reinstating) new sash windows, to repairing and replacing existing wooden sash windows. All of our new sash windows and box frames are built to order and installed by our own specialists and our work is fully guaranteed.
Why install sash windows? What are the benefits? 
•    Re-instate the classic look of period homes and add value to the property
•    Enjoy our 10 year warranty for added piece of mind 
•    Take advantage of the latest developments in window security
We also offer a draught-proofing and repainting service to give tired-looking timber sash windows a new lease of life making it ideal for those trying to keep the cost of sash windows ownership down.

It does pay off

to hire professional window fitters.

Installing or replacing windows is something you might be tempted to do yourself, but first consider the benefits of a professional installation. Here are the top three reasons to hire a pro. 
Guaranteed Professional Results: A professional installer has lots of knowledge and experience when it comes to replacing windows.

No Clean Up: Part of a good installer’s commitment is to leave your premises as they were before installation, which means removing all construction debris and leaving the work area clean. 
Protection: If there’s a warranty issue, it’s usually due to either the product or the installation. 

Because a professional installer has extensive experience with preparing and installing windows within a building envelope, it’s reasonable to expect your installer will be the most qualified and trustworthy person to do the job and to process any warranty requests should a problem arise.

Energy Efficient Windows.

If you want energy efficient windows for your home in the UK, then the name to remember is ATLASS London Ltd. The energy efficient windows we offer to homeowners are manufactured in the UK and have the following features: 
  • Durable master frames constructed from expanded polymer composites that are 400 percent stronger than ordinary vinyl
  • Triple-pane, American-made glass packs with two layers of krypton gas fills that serve as a barrier against weather, noise, condensation, and icing 
  • Two Low-E protective coatings on the glass, which allow sunlight to splash through the window while blocking out summer heat and keeping warmth inside your home during the winter
  • Triple weather stripping with full-depth interlock on the sashes to virtually eliminate drafts 
  • Availability in a wide range of exterior and interior finishes to suit your unique tastes in aesthetics and to help enhance the curb appeal of your home
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Windows for your home
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