Steel patio doors: Slim sightlines, thermal performance and sizes 

• 6 November 2025
• News

Walk into any home with steel patio doors and instantly you notice the difference. Light pours through narrow frames, catching on the glass and bringing the outside indoors. Rooms feel brighter and more connected, and there’s a palpable sense of space and calm. Crittall Windows has been creating steel doors like this for many generations, combining craftsmanship and precision to produce products that last a lifetime. 

Light, proportion and style

The real appeal of steel patio doors lies in their slim sightlines. Steel is strong enough to hold large glass panels, so you can enjoy more natural light without bulky frames getting in the way. This makes them ideal for modern homes and heritage properties, offering a sleek, industrial style that never feels harsh or brash. 

Whether you choose a single door, a pair of French patio doors or a larger multi-panel set, each option is made to measure. Black steel doors are a timeless favourite, but a wide range of colours is available to suit your home. The combination of clean lines and large glass panels gives every space a sense of openness while remaining practical and easy to maintain. 

Warmth and efficiency

Behind their elegant look, these doors are built to perform. Robust steel profiles, double glazing and tight weather seals keep heat in and cold out. That means better thermal performance, reduced energy bills and comfort throughout the year. 

Every door is tested for security and durability, giving you peace of mind alongside stylish design. The galvanised and powder-coated finish is resistant to rust and corrosion, meaning these doors require very little maintenance even as they last for decades. 

Sizes and configurations

Crittall steel patio doors are available in a range of sizes to suit different spaces. Heights typically reach around 2.4 metres, and bespoke options are available for larger openings. Thresholds can be flush for seamless indoor-outdoor flow or raised for external doors, depending on your needs. 

You can also choose from a variety of glazing options, from clear double glazing to reeded or decorative glass, to balance privacy and light. Each configuration is designed to feel tailored, practical and visually appealing. 

Built to last

Crittall steel doors are a combination of heritage and innovation. With almost two centuries of experience, the company has perfected the balance of elegance, strength and performance. Fully recyclable steel, expert craftsmanship and iconic design mean these doors are built to last for generations. 

If you’re considering steel patio doors for your home, a Crittall installation can transform light, space and the overall feel of a room. Browse our gallery or speak with our design team to explore bespoke window-and-door packages that bring your project to life.