Ultra-Slim Steel Doors for Modern Barking Homes

Bespoke steel doors with a sleek 25mm profile, advanced thermal insulation, and premium security – the perfect choice for contemporary homes and commercial spaces.

Why Slim 25 is the Best Choice for Your Project?

Modern room with black wall, glass door, potted plant, and blurred person walking.

  • Modern, clean lines for a sleek design.

  • Integrated polyamide thermal break ensures energy efficiency.

  • Built for long-lasting strength and stability.

  • Enhancing insulation and noise reduction.

  • Delivered within 12 weeks for quick project completion.

Comparison table between W20 and Slim 25 steel doors features, including material, profile thickness, aesthetic, thermal break, and application.

Redefining Steel Doors: Introducing Slim 25

The Slim 25 steel door combines sleek aesthetics, superior insulation, and high-end security, making it the perfect choice for residential and commercial projects.

Our bespoke handle collection

  • Beflast door handle by Auto Zdesign and Gla

    Belfast door handle for steel door

  • Steel door handle Cambridge

    Cambridge Steel Door Handle

  • Leeds stel door handle

    Leeds Steel door handle

Choose a Style

Different styles of window pane designs categorized as Style 2, Style 3, Style 4, and Style 5 with varied grid patterns and sections.
Grid layout samples for window designs, labeled styles 6, 7, 8, 10, and 12, showing various pane configurations.

See Slim 25 in Action

  • Sleek Black Door
  • Modern interior with black framed glass partition, white walls, cream sofa, colorful geometric art, red and blue round tables, and red chairs.
  • Modern living room with a large TV, speaker, and shelving unit beside a sliding glass door revealing a dining area. Features a lounge chair, wooden flooring, and decorative items.
  • Modern living room interior with gray sofa, abstract artwork, decorative mirrors, and a wooden console table. Wooden herringbone floor and glass pane door.
  • Modern bedroom interior with beige and orange bedding, wooden paneling, sliding closet door, indoor plant, and ceiling fan.
  • Modern living space with large glass partitions, minimalistic furniture, and children's play area with a book shelf and toys.
  • Modern open-plan kitchen with exposed brick walls, glass partitions, and wooden flooring. Visible furnishings include a central kitchen island with stools, hanging coats, and casual dining setup. Large windows provide natural light.
  • Modern interior with glass doors, wooden table and chairs, sculptures, and artwork on walls.

Get a Free Consultation Now

Have questions about your next windows or doors project? Contact us for a free consultation!

Get a Free Consultation

Ready to Upgrade Your Space with Slim 25?

Ready to Upgrade Your Space with Slim 25?

Close-up view of a black metallic door handle with a keyhole above it on a glass door.

Discover why Slim 25 Steel Doors are the perfect blend of sleek design, superior insulation, and unmatched durability. Our detailed product catalog provides everything you need to know—from technical specifications and customization options to real-world installations and pricing insights.

Get in touch.

Have questions about Slim 25 Steel Doors? Need a custom quote or expert advice for your project? Our team is here to help! Whether you're an architect, builder, or homeowner, we’ll guide you through the best options to match your style, security, and energy-efficiency needs.

Have Questions? We Have Answers!

  • 12 weeks guaranteed.

  • Yes, we offer custom dimensions.

  • Yes, thanks to the thermal break integration.

Customer Testimonials

  • Mark Watson

    I ordered 1No Cortizo COR Vision sliding door with 2No panes and 2No COR 60 windows in Fulham with a tilt and swing opening function. Both products are excellent quality. The measuring and installation was well managed. As we were 3 days behind the schedule, flexibility was provided with the date of installation which was most helpful. With slim sightlines, discrete handles, a flush threshold inside and outside and smooth opening the sliding doors are great. Similarly, the windows are excellent with robust handles and a very satisfying opening and closing mechanism. I would liken them to a door rather than a window. I would strongly advise the products and the service provided by AtoZ D&G.

  • Peter Grenfell

    I used Zhan and the team to source and fit wooden but contemporary windows and doors to our home. We are really pleased with the outcome - and the guys worked very hard to do quite a complicated fit out and remove the old units. Good value too for the size of the job. Definitely recommend.

  • Pipa

    I chose AtoZ Design and Glass for the supply of aluminium windows for our office in Notting Hill, and I'm pleased to say they exceeded my expectations. The windows are not only of excellent quality but also beautifully complement our office space. Their service was prompt and professional throughout the process. I highly recommend AtoZ Design and Glass for their top-notch products and services.

  • Svetlana Gherman

    Happy with the product supplied by A to Z Design and Glass.

    Will order again

  • Damian Parpalac

    Very happy, delivery was on time, was safety delivered at the door, windows was protected very good.

    I recommend it.

  • Polina Pisartsova

    I recently worked with AtoZ Design and Glass to supply and install my slim profile sliding door. Their service was impeccable, and the door looks fantastic. Highly recommended!

  • Mary Ellen Simpson

    Quality services ! Vladimir and his team once again have produced fitted furniture of the highest quality. The process from design to fitting was exemplary-communication was outstanding and attention to detail absolutely first class

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