AG210 Metal Windows From Met Therm

The slimmest A+10 rated thermally broken metal windows available

Slimline Metal Windows

Slimline Metal Windows That Offer A+10 Style and Efficiency

We specialise in designing, manufacturing, and installing beautiful A+10 rated energy efficient, double-glazed metal windows. Our AG210 windows are approved by Conservation Officers for their slimline frame and traditional styling.

They recreate the elegant sight lines of classic steel windows without compromising on modern efficiency. Discover the benefits of the slimmest, thermally broken ‘A+10 rated’ metal windows.

We are delighted with our new AG210 replacement windows, soundproofing, and lack of condensation are very noticeable and we are feeling the effects of the thermal insulation.

AG210 Windows From Met Therm

Our AG210 metal windows are totally unique. Exclusively manufactured by Met Therm, AG210 are the slimmest thermally broken ‘A+10 rated’ metal windows available. Our windows are suitable as an alternative or replacement for steel casement windows including W20, W30, W40, W50, SMW series windows.

Part L 2022 and Part Q/PAS 24 Compliant Windows

Compliant with Part L 2022 and Part Q/PAS 24 building regulations, our slimline windows are ideal for New Build projects, as well as renovations and replacements.

Benefits Of Our AG210 Windows

We are able to provide a metal window that offers all the benefits of a modern window, with the look and style of a classic, slim frame.

  • Energy efficient A+ rating
  • Elegant sightlines
  • Ideal for New Builds & replacements
  • Install into stone, wood, metal
  • Customisable design and installation
  • Multipoint locking as standard
  • Polyester powder coated frames
  • 10 year guarantee**

“We are both very happy with the windows and the installation. They look fantastic, and the reduction in noise and heat loss is impressive.”


We provide a range of frame options suitable for New Builds and replacement windows. The metal frames can be polyester powder coated in any standard RAL classic colour.

If you want frames finished in different colours inside and out, dual colour is also available. All our frames come with a choice of finishes including:

  • Matt
  • Semi-gloss
  • Hammerite (subject to availability)


Met Therm’s AG210 metal windows are fitted with traditional fully working welded hinges and peg stays as standard.

This provides the traditional features so often required to achieve an authentic match in period and conservation replacements/renovations. We also offer sliding stays to maintain period features of original windows.

  • Welded hinges
  • Concealed friction hinges
  • Sliding stays

Glass & Glazing

Our slimline windows retain the maximum amount of glass in all windows.

This means you get elegant sightlines and a better view. Our thermally broken frames are glazed using 24mm double glazed argon-filled units and the latest thermally efficient glass.

This provides a BFRC ‘A+10 rated’ window, making your home lighter, brighter and warmer.

Features & Specs

In keeping with a classic look and feel, our metal windows include traditional working features, including operational welded hinges. Using flat or rounded leads in a range of widths, all soldered and antiqued for greater authenticity, we can replicate the features of your period windows.

For a more modern look, concealed friction hinges help maintain slim sight lines in a more contemporary style.

Thermally Broken Metal Windows

Traditionally, the frames of older metal windows let more heat escape and more cold filter in. All of our A+10 rated metal windows are thermally broken. This means our windows make use of a ‘thermal break’ which acts as a barrier to prevent heat escaping and cold coming in. Not only this, thermal breaks have the additional benefit of making your windows more soundproof.

Discuss Your Needs Today

Whether you have steel windows or traditional period windows and are looking for an alternative to replace them. Why not give us a call?