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low level threshold
Low Threshold Option
any house style
Suits All House Types
matching doors and windows
Matching Aluminium Doors


Slim, secure, reliable and attractive Alitherm single doors for the side or back of your home and anywhere you need a quality-made aluminium door. 

Available in a choice of traditional or modern frames, and matching to the same suite of windows for a consistent look in the home.  Personalise your door with the vast range of standard or special colours including woodgrain aluminium.  Affordable, high performance doors to improve the look, security and energy efficiency of your home.  Our doors come from the best selling Smart Systems with the latest generation of insulated, slimline aluminium.

Technology & Design

Thermally efficiency comes from durable and slim aluminium sections with polyamide thermal barrier technology.  As a result, these slimline doors combined with quality double or triple glass exceed the requirements of current Building Regulations.  You benefit from improved thermal transfer making these windows energy efficient and helping to reduce condensation compared to poor insulated single glazed windows. 

Alitherm single doors come with extensive choices of colour including some specialist finishes only available with this product. For instance, the Sensations and Alchemy range offers textured powder coated finish giving you modern tactile surface finishes, perfect for modern decors. 

Being aluminium, you get strong doors without the additional reinforcements found in PVCu or composite doors. And this strength with thin frames give your larger door and window sizes than other materials too. Best of all these doors are up to 50% slimmer than typical PVCu residential doors. 

Alitherm single doors with glazed sidelight

Product Details

Open out or open in, our Alitherm single doors provide high security, reliable everyday use with flexible design and configuration options.  Affordable aluminium doors from one of the UK’s top brands make these perfect in any home. 

  • Comes with a contemporary or traditional look to match with your home. 
  • Available with 28mm or 32mm triple glazed units for security, privacy, acoustics or shade.
  • Reliable and secure multi-point locks with high security cylinders. 
  • Internal glazing beads provide additional security preventing removal of the glass from outside. 
  • Customise your doors with vertical or horizontal bars or adding coloured solid panels. 
  • Sophisticated seals and gaskets provide excellent weather performance.

Alitherm single doors leading to a balcony


Personalise your new aluminium door with the choice of a contemporary look using a square frame, flat door sash and square detail on the inside.  The traditional option comes with a profiled frame, flat door sash and bevelled appearance inside, replicating the ovolo style of a traditional door. 

Then choose your door design. All doors come with opening in or out options, hinged on the left or the right.  You can have a door with a midrail, glazed top and bottom or with a solid aluminium panel. Or add vertical bars to the top pane for a more traditional look. Or why not set the midrail  low for a contemporary door with more glass to add light?  You also get to choose between a standard weathered step-over threshold or a low threshold, perfect for pushchairs or wheelchair users. As well as functionality, the low threshold creates a flush look and has a minimal step-over.

Choose from straight or swan-style handles in seven different colours.  We offer white, black, grey, graphite, chrome, satin silver and gold. The come with matching or contrasting colour hinges too. 

Finally you get over 200 different colours to choose from including special textured surfaces and even woodgrain aluminium. Every colour comes with the same low-maintenance properties and needing an occasional clean. 

white Alitherm single doors

Security & Performance

Every one of our Alitherm doors comes made with your security and safety in mind. As standard we provide toughened glass units to the latest British Standards. Our doors also come with:

  • U Value as low as 1.6Wm2K when triple glazed . 
  • Maximum door sizes up to 2.4m high. 
  • Extruded to Kitemark and other relevant British standards. 
  • Weather tested to the latest performance standards. 
  • Meets PAS24 security standards when specified accordingly. 

security handle on Alitherm single doors

Product Features


For side, rear or porch doors, your new Alitherm single door comes designed and engineered for optimum reliability, security and strength. Your door has a tried-and-tested mechanical hand-assembled construction with stong brackets and cleats at the door and frame corners, with these corners, also sealed against water entry.

The primary door hardware comprises a lever/lever or lever/pad lock using a high security cylinder. Hinges and lock mechanisms come with adjustment, so we ensure your finished door is set up correctly and for optimum performance. A lift-to-lock operation secures your door and your home.


As standard, we provide energy-saving sealed units with a soft-coat low-emissivity coating, warm edge spacer bars and argon gas fill. 

With toughened safety glass as standard, your doors are safe, secure and protected. Or you can upgrade to higher security glazing, and obscure glazing for porch doors.

modern glazed screen with Alitherm single doors


The durable powder-coated finish on your new doors is professionally applied at source using the latest technology and quality control procedures. Every colour comes with low-maintenance properties only needing a routine clean with a mild soapy solution.

Add a contemporary or heritage colour using our specialist finishes. Alchemy colours give you options for silver, gold, steel and black metallic doors. Anodised finishes are also available. Sensations colours come in a metallic tactile surface finish with incredible durability and a unique finish to your new doors.

colours available with Dutemänn FD85 Bifolding Doors

Energy Efficiency

Current Building Regulations call for U-Values of 1.8W/(m2K) when replacing existing doors or 2.0W/(m2K) for new building projects. Our glass comes with a centre pane U-Value designed to work with the insulated frames and exceed the requirements of current Building Regulations. Therefore you rest-assured your new aluminium doors perform all year round and help lower your heating bills.

Some of the images on our website are indicative images illustrating how products may look. Please contact us for full product details and specifications.

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