Slimline Sliding Doors
Slimline Sliding Pocket Doors
Slimline Aluminium Bifold Doors
Aluminium Designer Front Doors
Aluminium Pivot Panel Doors
Slimline Aluminium Shop Fronts
Steel Look Aluminium Doors
Steel Look Bifold Doors
Steel look Internal Doors And Screens
Bespoke Aluminium Windows
Aluminium Vertical Sliding Sash Windows
Aluminium Casement Windows
Aluminium Tilt & Turn Windows
Steel Look Windows
Passivhaus Windows
Arched and Curved Windows
Glass Box Extensions
Roof Lanterns
Flat Roof Windows
A guide to installing aluminium windows in period properties
13 February 2025 | General
Versatile system for residential and commercial properties
At Direct Trade Windows, we expertly install aluminium casement windows in both commercial and residential properties.
Using Smart’s Alitherm Heritage model, this versatile system is an excellent addition to any property, and is ideal for projects that require planning permission.
Our casement windows are:
- Versatile – Fixed, single or double sash, top hung, tilt & turn, or pivot options.
- Thermally efficient – Polyamide thermal break enhances thermal efficiency.
- Durable – Perform consistently for several decades without wear and tear.
- Secure – Equipped with full PAS24 accreditation.
Alitherm Heritage Casement Windows
Alitherm Heritage casement windows are built as a series of horizontal modules which can be stacked using horizontal couplers from a multi-part window featuring a specially designed drip bar between modules.
- U-value of 1.5 W/m²K
- Document L compliant
- PAS24:2016 accredited
- Fixed, tilt & turn, side hung or top hung casements available
- Polyamide thermal break provides enhanced thermal performance
Dimensions:
- Side hung maximum width: 600mm
- Side hung maximum height: 1400mm
- Top hung maximum width: 1400mm
- Top hung maximum height: 1400mm
- Fixed maximum width: 2100mm
- Fixed maximum height: 2100mm
Alitherm Heritage Casement Windows
Technical Specification
- Brand Alitherm
- Material Aluminium Polyamide
- Dual Colour Yes
- Thermally Broken Yes
- NBS Available Yes
- WER Rating B
- U Value 1.5W/m²K (using 1.0W/m²K glass unit)
- Document L Compliant Yes
- Kitemark Yes
- BS 6375-1:2009 Yes
- BS 4873 Yes
- Side Hung Max Width (mm) 600
- Side Hung Max Height (mm) 1400
- Top Hung Max Width (mm) 1400
- Top Hung Max Height (mm) 1400
- Fixed Max Width (mm) 2100
- Fixed Max Height (mm) 2100
- Single Door Max Width (mm) 900
- Single Door Max Height (mm) 2100
- Glazing (mm) 24, 28, 32 & 36 double or triple glazed units
- Frame Depth (mm) 47
- Typical Sightlines (mm) 59
Colours
Colours
Pure White RAL-9010
Matt White
Matt Brown
Jet Black RAL-9005
Grey
Gloss White
Gloss Off White
Dark Red
Dark Grey
Dark Green
Dark Brown
Dark Blue
Cream
Black
Anthracite Grey RAL-7016
Airforce Grey
Glass Options
Glass Options
Unglazed
Standard Self Clean
Standard Tough
Solar Control
Self Cleaning
Self Clean Solar Control
Satin Obscure
Laminated Security
Hardware Options
Peg Stay Monkey Tail & Pear Drop
Peg Stay Catch
Pear Drop Handle
Monkey Tail Handle
Dummy Butt Hinge
Standard Handle Brass
Standard Handle Satin
Standard Handle Chrome
Standard Handle White
Standard Handle Black
Downloads
Gallery
Aluminium Casement Windows - Your Questions Answered
Explore common questions about our Aluminium Casement Windows, suitable for both residential and commercial properties. Discover how these windows offer durability, performance, and energy efficiency.
Get a Free Quote for Alitherm Heritage Casement WindowsWhat are Aluminium Casement Windows, and where can they be installed?
Aluminium casement windows are a versatile window system suitable for both residential and commercial properties. They can be installed in various settings, including homes, offices, and other commercial buildings.
What are the key features of these casement windows?
These casement windows offer versatility with options such as fixed, single or double sash, top hung, tilt & turn, or pivot styles. They are thermally efficient thanks to a polyamide thermal break, built for long-term durability, and equipped with full PAS24 accreditation for security.
How energy-efficient are Alitherm Heritage Casement Windows?
Alitherm Heritage Casement Windows have a U-value of 1.5 W/m²K, making them energy-efficient and compliant with Document L standards. The polyamide thermal break enhances their thermal performance.
Can I get custom dimensions for these casement windows?
Yes, you can. Depending on your needs, you can choose from a variety of dimensions for side hung, top hung, and fixed casement windows, providing flexibility for different project requirements.
Are these windows suitable for projects that require planning permission?
Yes, these casement windows, particularly using Smart's Alitherm Heritage model, are ideal for projects that require planning permission due to their versatile and high-quality design.
Delighted Customers Share Their Experiences
At Direct Trade Windows, our commitment to excellence is reflected in our exceptional customer satisfaction.
We take great pride in our impressive 4.9 rating on Google, a testament to the unparalleled quality and service we offer.
Latest News
See all news
Get a Free Online Quote
Find your next steel-look windows and doors today! Use our handy quoting engine to receive a free, no-obligation quote. You’ll be able to find most of our products with our quoting engine – look through to find the designs for your next sleek and modern installation, or contact us online and a member of our team will be happy to help.
Get a Quote
Join Our Installer Network
Join our installer network for free and gain access to the highest quality windows and doors supplied directly to you. As a valued member of our installer network, you’ll receive lucrative leads, benefit from infrastructure and sales support from our in-house experts, and will also receive technical support when you need it.
Apply Now
