Everything You Need to Know About External Staircases
When it comes to durable, practical, and visually striking access solutions, an external metal staircase is hard to beat. Whether installed on commercial buildings, residential properties, or industrial units, these structures offer long-lasting performance and flexibility, making them a smart investment for a wide range of applications.
But what type of staircase should you choose? What affects the staircase cost? And how do you ensure longevity, safety, and compliance with building regulations?
Let’s break it down.
Why Choose an External Metal Staircase?
Steel is the most common material for external staircases, and with good reason. It’s strong, cost-effective, and can be adapted to suit everything from sleek commercial fire escapes to architectural statement pieces.
Key benefits include:
- Weather resistance when treated properly (galvanised or powder-coated)
- Structural strength for both light and heavy-duty applications
- Design flexibility, including straight, L-shaped, and spiral staircases
- Low maintenance compared to timber or composite alternatives
These qualities make metal staircases particularly well-suited for outdoor environments where other materials may falter under exposure to the elements.
Galvanised Steel: Built to Last
Galvanised steel is a preferred option for many external staircase projects due to its corrosion resistance. Through a process called hot dip galvanising, steel is coated in molten zinc, forming a protective barrier that helps it resist corrosion, even in harsh environments.
This is particularly important for staircases exposed to the elements year-round, where moisture, pollution, and temperature fluctuations could otherwise accelerate rusting. Galvanised steel ensures that your staircase will maintain its strength and appearance for many years with minimal maintenance required.
In addition to its durability, galvanised steel provides excellent structural integrity, ensuring that your staircase will be a safe and reliable access solution for years to come. It’s one of the most cost-effective materials for outdoor use, delivering both performance and value.
Spiral Staircases: Compact and Elegant
For properties with limited space or where access needs to be discreet, spiral staircases are an excellent option. They save space while still meeting safety requirements, making them ideal for rear access to flats, balconies, or loft conversions.
Plus, spiral designs can add an eye-catching architectural element to an otherwise utilitarian structure. A spiral staircase can serve as both a functional solution and a design feature that enhances the aesthetic of your property. Whether you’re designing a small backyard entrance or a larger multi-storey building, spiral staircases can be customised to suit the specific needs of your property.

What Affects Staircase Cost?
The cost of an external staircase can vary significantly based on several factors:
- Size and height – Taller buildings require more material and additional anchoring to ensure safety.
- Design complexity – Bespoke shapes or decorative features such as custom treads, handrails, or intricate balustrades can add time and cost to the project.
- Finish – Galvanising, powder coating, or paint coatings each affect longevity and price. While galvanising offers great corrosion resistance, powder coating can provide a wider range of aesthetic finishes and colours.
- Installation requirements – The complexity of installation depends on the type of building. For example, fixing into masonry can be more labour-intensive than installing into a steel frame structure.
At Smart Steels, we offer transparent quotations and expert advice to help clients choose the most cost-effective yet durable option for their needs. By taking all these factors into account, we ensure that our clients get the best possible staircase solution for their budget.
Custom Design Meets Compliance
All external metal staircases must comply with UK Building Regulations, particularly in relation to step height, tread depth, balustrades, and non-slip surfaces. Safety is paramount when designing and installing external staircases, and ensuring that your staircase meets the relevant regulations is crucial for both day-to-day access and legal compliance.
At Smart Steels, our experienced team ensures that every design meets these standards while delivering the clean lines, precise detailing, and long-term performance we’re known for. We take pride in ensuring that each staircase we design is both safe and stylish, whether you’re after a bold entrance feature or a discreet rear escape.
Whether you’re planning a staircase for a commercial building or a private residence, we work closely with you to ensure that every aspect of the design meets your specific needs, while complying with all relevant safety standards.
Conclusion: Form, Function, and Longevity
An external staircase should do more than just provide access. It should be safe, hard-wearing, and enhance your building’s overall look. And, by choosing galvanised steel or powder-coated finishes, you ensure excellent rust resistance, minimal maintenance, and a professional finish that will last for years to come.
Looking to install or upgrade your external metal staircase? Contact Smart Steels for expert advice, precision fabrication, and a tailored design that fits your space and budget. We are dedicated to providing our clients with the highest level of service and craftsmanship to ensure that their staircase will perform well and look great for many years.

FAQ
Do I need planning permission for an external metal staircase?
In some cases, yes, and especially if the staircase affects the building’s appearance or privacy of neighbours. Always check with your local authority to ensure compliance with planning regulations.
Is galvanised steel the right choice for outdoor use?
Yes, galvanised steel is ideal for outdoor use due to its corrosion resistance. The zinc coating provides a protective layer that prevents rust, even in harsh environments like coastal areas or industrial settings.
Can you customise spiral staircases?
Absolutely. Spiral staircases can be fabricated to fit tight spaces, and we offer various options for balustrades, finishes, and treads to match your property’s style and needs.
How much does an external metal staircase cost?
Costs vary based on size, design, materials, and site conditions. Contact Smart Steels for a bespoke quote tailored to your specific requirements.
Are your external metal staircases compliant with UK Building Regulations?
Yes. All of our designs are fully compliant, with safety and accessibility built in from the start. We ensure every staircase meets the relevant regulations for step dimensions, handrails, and other safety features.
Do you offer installation?
Yes, we manage the full process from design and fabrication through to expert installation, ensuring that your staircase is properly fitted and meets all safety standards.