best metal for outdoor use

Outdoor fixtures in the UK must withstand moisture throughout the year. However, when coupled with freezing temperatures and salty air in coastal areas, it can accelerate corrosion. Whether you are installing railings, updating a gate, or building a pergola, selecting the right metal is crucial. This early step can help prevent early wear and lower future maintenance needs.

Each metal responds differently to moisture, salt, and temperature swings common across the UK. Stainless steel 316 offers long-term rust resistance in harsh environments. Aluminium is lightweight, low maintenance, and ideal for trims or decorative builds. Galvanised steel provides strong, budget-friendly support, and brass adds lasting aesthetic charm.

This guide compares performance in real-world UK conditions. So, you can then choose the best material for your project based on its durability, cost, and ease of maintenance.

What Affects Metal Performance Outdoors?

Metal fixtures exposed to weathering vary in performance based on site and design. Key considerations include:

  • Weather Exposure: According to the Galvanizers Association, in coastal areas, airborne salt can increase corrosion rates compared to inland locations.
  • Structural Load: Gates and balustrades require strength and rigidity; lighter uses, such as fascia trims, do not.
  • Maintenance: Some metals with natural patinas require cleaning or sealing, while others require minimal care.
  • Appearance: Choose a finish, such as brushed, satin, or matte, that complements your architectural style.
  • Long-term cost: Higher-grade materials often outlast lower-grade ones, thereby lowering the overall cost over time.

The ONS Construction Output Report for April 2025 states that repair and maintenance output increased by 0.3%. Meanwhile, non-housing repair work held steady. This suggests that homeowners are increasingly interested in upgrading their exterior fixtures for better function and durability.

Aluminium

Aluminium naturally forms a protective oxide layer that resists corrosion without the need for added coatings. Its light weight makes it easy to carry and move. It also provides enough strength for trims, fascia panels, privacy screens, and raised beds. Aluminium handles damp conditions nicely. However, it can corrode when it comes into contact with incompatible metals, such as steel, unless there is insulation.

Aluminium does not rust like other metals. Therefore, it requires minimal maintenance and remains clean, especially when powder-coated. For places with extensive exposure, such as pergolas or louvre panels, aluminium is a smart and affordable option. ClickMetal’s aluminium range includes tube, sheet, and channel formats; all cut to specification.

Stainless Steel

Stainless steel is durable and resistant to rust. This makes it a dependable choice for outdoor features. Both 304 and 316 grades are non-magnetic, austenitic alloys from the 300 series. However, their suitability depends on your site conditions.

Stainless Steel Grade 304

  • Performs well in most UK outdoor domestic settings
  • Commonly used for railings, gates, and wall-mounted fixtures
  • Can be vulnerable to pitting in salt-heavy or chlorinated environments

Stainless Steel Grade 316

Select 316 stainless steel for areas near the sea. It is ideal for areas with high exposure, as it provides adequate corrosion protection over time. For inland, low-pollution environments, 304 is a durable and cost-effective alternative.

Both are available in brushed or satin finishes for a clean, contemporary appearance with minimal upkeep. For areas affected by road grit or de-icing salts, 316 should be the default. You can order angle, round bar, and cut-to-size sheet from our stainless steel products range.

Galvanised Steel

Galvanised steel is mild steel coated in a layer of zinc to protect it from rust. The zinc layer corrodes in place of the steel substrate, effectively acting as a physical and electrochemical shield. This makes it a reliable choice for outdoor structures such as fence posts, decking subframes, bins, or bike shelters.

The Galvanizers Association says that hot-dip galvanised steel can last between 34 and over 170 years. This depends on where it is used and the thickness of the zinc. In rural inland areas, the protective layer ages slowly. By the sea or in polluted urban areas, the coating wears out more quickly. However, it can still last for decades.

Its matte grey finish may become dull over time, but it can be enhanced with clear sealants or powder coatings. Galvanised steel is not often selected for its appearance. However, its strength and durability make it ideal for load-bearing parts where appearance is not a concern. Order yours from our galvanised steel range today.

Brass

Brass is an alloy of copper and zinc valued for both appearance and performance. It has natural corrosion resistance and antibacterial properties. This makes it a practical and stylish choice for external handles, wall lights, signage, and accent details. Its durability, along with a natural gold-toned surface, softens over time but remains strong. It is suited to both heritage renovations and high-spec garden designs.

In wet or coastal places, brass can create a patina. This green or brown coating helps shield the metal below. This ageing process is natural and can be either preserved or polished off, depending on your preference. High-copper brass alloys, which contain over 60% copper, offer better resistance for outdoor use. The Copper Development Association UK says brass is often used for architectural cladding and fixtures.

Although more costly than aluminium or mild steel, brass remains a popular choice where finish and longevity matter. Our brass range includes bars, plates, and profiles, all cut to size, suitable for both decorative and practical outdoor uses.

Three-step metal selector for UK homeowners

Not sure where to start? Use this simple guide to match the right metal to your project.

1. Assess Your Site Exposure

  • Inland or urban? Aluminium, 304 stainless, or galvanised steel all work well.
  • Coastal or high-chloride areas? Choose 316 stainless or sealed brass.

2. Define Your Maintenance Threshold

  • Prefer a hands-off approach? Go for powder-coated aluminium or galvanised steel.
  • Willing to clean or seal seasonally? Stainless and brass reward the effort.

3. Match the Finish to Your Style

  • Modern? Brushed stainless or anodised aluminium.
  • Traditional? Satin brass or aged galvanised.
  • Industrial? Corten-style finishes or exposed zinc (currently unavailable via ClickMetal).

Choose with Confidence

Choosing the best metal for outdoor use comes down to three factors:

  • Exposure to the elements
  • The look you want to achieve
  • Time dedicated to upkeep

Stainless steel 316 is the trusted choice for coastal areas. Aluminium suits lightweight structures with a clean finish. Galvanised steel delivers dependable performance at a lower cost. Brass provides a unique finish to visible elements. It pairs durability with impressive visual detail.

At ClickMetal, we supply all of these metals, cut to size with ±2 mm precision and typically dispatched within 3–5 working days.

Call 01794 526090, order online today or request a custom quote for your next outdoor project.