Double Glazed Windows and Doors

At Todi & Boys, we specialise in double glazing in London, offering expertly crafted windows and doors at the core of our services. Our double glazing is of the highest quality and built to last, as we manufacture and oversee it ourselves.

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An image of windows with the text underneath reading "how will Double Glazing improve my family's quality of life?"

Experts in Double Glazing Windows in London

When done correctly, double glazing provides seamless results, extensive benefits, and long-lasting durability. Unlike many others, we are one of the few joineries in the UK that manufacture our own double glazing. This ensures we maintain our mission to keep the glazing thin and true to your original windows and doors.



What are the benefits of double glazing?

In addition to insulating your home and reducing heating bills during winter, double glazing keeps your home cool in summer by blocking excessive heat. As well as this, our double glazing also offers these benefits:

  • Increases property value
  • Reduces street noise
  • Enhances safety and security
  • Eliminates water droplet and condensation build-up

Why we make our own double glazing

When buying double glazing from a company that manufactures glass, they offer standard double glazing, typically 22mm, 24mm or 26mm thick. This is because they serve a variety of markets, including uPVC and aluminium windows.

We make our own double glazing in our London workshop so that we can maintain our high standards. It means we can offer many more options when it comes to glass than other companies. Due to this, we can also guarantee our double glazing won’t fail for 7 years, our glass should last 10 years but we’re hoping we’ve done enough so that it lasts decades.

How do we make our double glazing?

All our double glazing is produced in our local London workshop, following these steps to improve thermal insulation and minimise moisture risks:

Frame preparation

The double glazing is a frame made up of two panes of glass, sandwiched together against a spacer.

Moisture absorption

The spacer is filled with small beads that absorb any moisture or water vapour within the double glazing. These beads work similarly to how silica beads found in new bags work.

Waterproof seal

A waterproof seal is applied to prevent water vapour from entering the double glazed unit.

Air removal

The air inside the double glazing unit is removed and replaced with inert gas (Argon) to enhance insulation. Additional low E-rated glass is used to further improve insulation.


Double Glazing: The Finer Details

You know when you look at two items and while you can’t put your finger on why, you know that one looks nicer than the other?  It’s mainly down to the glass. The thinner it is, the better it looks.

Other companies will say they use thicker glass for energy efficiency and not to save money but we disagree. Energy efficiency is measured in a U-Value, and the U-Value is expressed in the unit W/m2k. The lower the value, the more energy efficient the glass.

The requirement by law is to manufacture windows less than 1.5W/m2k. Our windows offer 1.4 W/m2k. To put this into perspective, a single glazed Victorian sash window stands at around 5.2W/m2k. Yes, thicker glass only offers marginally better insulation (1.3 or 1.2W/m2k), but it makes windows really chunky and simply isn’t worth the trade-off.

Thin vs. thick

Our clients and customers trust that when they place an order with us, even though they don’t 100% understand what they’re getting, they trust it’ll look almost like their original window.

This is particularly important with Georgian windows and windows with glazing bars on them because they are typically found exclusively in conservation areas. They need to be in keeping with the property.

The detail is in the glazing bars. Windows that are produced by other manufacturers tend to incorporate bars that are much thicker and aren’t as discreet as ours.

What are glazing bars?

Glazing bars act as rigid support between two adjacent panes of glass to help maintain the overall structural integrity. They’re an essential aspect of modern-day windows in the UK.


Double glazing glass types

There are several double glazing glass types, but don’t let this overwhelm you, we’ll run through each one so you can be confident in your final choice.

Toughened glass

Is required on all doors and windows below a certain height. It goes through a tempering process – heated, cooled, and heated again to strengthen the glass. But when it breaks, it shatters into a million tiny pieces.

Laminated glass

Is more secure than toughened glass and holds together well even when broken – just like a car windshield. Some of our customers who are particularly worried about burglars prefer this option.

Acoustic glass

Is popular in the city because there are so many busy roads and much more general noise to block out. It’s made up of two 3mm thick panes of glass, with a special acoustic dampening interlayer. Note, if you’re under a flightpath acoustic glass doesn’t help all that much because you’re experiencing vibrations coming through the roof of your house.

Obscure glass

Is available in all sorts of different options, the most common being sandblasted frosted, also known as satin. However, if you have a special preference or have found something different online, we can source it for you.

Low iron glass

Is made with lower iron content, is clearer, and has a reduced tint. It’s barely noticeable to the untrained eye, which is why some customers really like the idea and some architects specify it.

Solar control glass 

Has quite a noticeable tint and is used in areas where the sun penetrates throughout the day, turning rooms into saunas! It reduces the amount of heat that comes through the glass and maintains the room temperature.

Stained glass

Is a work of art in itself! We partner with Coriander Stained Glass – they can make brand-new stained glass panels or refurbish existing stained glass that we then fit. The result is always stunning!

Lead and coloured glass

Is just as eye-catching as stained glass and because we have our own glass shop, we can copy any lead pattern and use 6mm, 9mm, or 12mm thick lead, depending on the original glass. We can also create double-glazed coloured glass units, and are one of the very few companies to do so!

Double Glazing in London

At Todi & Boys, we have used our bespoke designs to make classic and timeless windows and doors that have elevated many London homes. We offer a variety of products with the aim to take your home to the next level, whether that be sash windows or French doors.

As both double glazing installers and manufacturers, we are passionate experts who guide you throughout the process to bring your vision to life. From your first inquiry, we’re with you every step of the way – any idea, big or small – get in touch! 


Get in Touch

Call us now for a free survey on: 0208 785 1223

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Or send a message in the contact form with a brief description of your enquiry.

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