Cladding is the outer skin of a building. It’s a layer of material, such as metal, wood, brick, or vinyl, fixed to the exterior walls to shield the structure from weather, improve insulation, and shape how the building looks. Think of it as a protective shell: the building’s structural walls hold everything up, while the cladding wraps around the outside to keep rain, wind, and temperature extremes from getting through.
What Cladding Actually Does
Cladding serves several purposes at once. Its most basic job is weatherproofing. Rain, snow, and wind constantly batter a building’s exterior, and cladding acts as the first line of defense, preventing moisture from reaching the structural walls behind it. Many modern systems use a “rainscreen” design, where panels are mounted on a framework with a gap behind them. That gap allows ventilation and drainage, so any moisture that does get past the outer layer can escape before it causes damage.
Thermal performance is the second major function. Cladding systems typically include or work alongside insulation that helps regulate indoor temperature. In the UK, building regulations require external walls to meet a maximum U-value of 0.35 W/m²K, a measure of how much heat passes through a surface (lower numbers mean better insulation). Metal cladding systems with mineral wool insulation around 110 to 130 mm thick can meet these standards, keeping heating costs down in winter and reducing heat gain in summer.
Then there’s the structural role. Cladding needs to withstand the forces placed on it, including wind loads, impacts, and its own weight. A well-designed system stays stable and flat for decades, even as temperatures swing and storms hit. And of course, cladding is what gives a building its visual identity. The same concrete structure can look entirely different wrapped in timber, glass, or brushed aluminium.
Common Cladding Materials
Wood
Timber cladding has been used for centuries and remains popular for its natural warmth. The key is choosing a “stable” wood species, one that maintains its shape through temperature swings, humidity changes, and sun exposure. Western red cedar is a common choice, with an expected lifespan of 25 to 35 years. Higher-quality or specially treated timber, such as thermally modified wood or charred wood (a Japanese technique called shou sugi ban), can last up to 60 years with proper care. The trade-off is maintenance: untreated wood is vulnerable to rot, fungal decay, insect damage, and warping. Regular sealing and painting are necessary to keep it in good condition.
Metal
Aluminium and steel cladding are among the most durable options, with expected lifespans reaching 100 years. They require minimal upkeep compared to wood, though protective coatings can wear off or get scratched over time, leading to rust and corrosion, particularly in coastal environments. Metal composite materials have become increasingly popular with architects because they can be formed into three-dimensional shapes and complex patterns, moving well beyond the flat, industrial look metal cladding once had. Colorbond standing seam panels, aluminium sheets, and copper are all common choices, each with a distinct aesthetic.
Vinyl
Vinyl siding remains one of the most widely used cladding materials, especially in residential construction. It’s lightweight, affordable, and resistant to moisture in a way that wood is not. From a lifecycle perspective, vinyl performs well on sustainability metrics because it requires fewer resources to manufacture, lasts a long time, and is recyclable. Some products now incorporate up to 70% recycled content. Modern vinyl can closely mimic the look of wood grain without the moisture absorption or maintenance demands.
Brick, Stone, and Terra Cotta
Traditional masonry cladding, brick and stone, offers exceptional durability and fire resistance. These materials are heavy and labour-intensive to install, but they weather beautifully and need very little maintenance over their lifetime. Terra cotta is experiencing a resurgence in modern architecture, with manufacturers now producing it in custom three-dimensional shapes that can be used on curtain walls and complex facades, not just flat surfaces.
How Much Cladding Costs
Prices vary significantly depending on the material, project complexity, and scale. As a rough guide using Australian market data (which reflects global trends in relative pricing): Colorbond standing seam wall panels run about $280 to $320 per square metre installed. Aluminium panels cost $350 to $400 per square metre. Premium materials climb steeply: zinc cladding sits around $450 per square metre, and copper ranges from $500 to $600. The sub-construction behind the panels adds cost too. Plywood backing runs about $90 per square metre, while a simpler top hat framework costs around $50.
Timber and vinyl are generally cheaper upfront for residential projects, but the total cost of ownership shifts when you factor in maintenance. Wood needs periodic refinishing every few years, while metal and vinyl can go decades with little more than a wash.
Fire Safety Ratings
Fire performance is one of the most critical considerations in cladding, especially after several high-profile fires exposed the dangers of combustible exterior materials on tall buildings. Cladding materials are classified under a European standard (BS-EN 13501-1) that ranges from Class A1 to Class F:
- Class A1: Completely non-combustible. Will not contribute to a fire at all.
- Class A2: Limited combustibility. Passes the most stringent tests for heat, flame spread, and smoke release.
- Class B: Combustible but contributes very little to fire. Includes some fire-resistant engineered boards.
- Class C: Limited contribution to fire. Includes materials like plywood and fibreboard.
- Class D: Medium contribution to fire. Can resist a small flame for a long time but releases more heat.
- Class E: High contribution to fire. Resists a small flame only briefly.
- Class F: Highly flammable or untested.
Only materials rated Class A (A1 or A2) can be used on high-rise buildings 18 metres or taller. This is a direct response to tragedies where combustible cladding panels and insulation allowed fires to spread rapidly up building facades.
Regulations and Remediation Deadlines
Governments have tightened cladding rules dramatically in recent years. In the UK, a forthcoming Remediation Bill will create a legal duty for building owners to remove and replace dangerous cladding. The deadlines are staggered by building height: all residential buildings over 18 metres must complete remediation works by the end of 2029, and mid-rise buildings between 11 and 18 metres must finish by the end of 2031. Fire risk assessments will be required for every building above 11 metres by December 2027.
The enforcement is serious. Building owners who fail to act could face unlimited fines or criminal prosecution. Progress will be tracked through a new national reporting system. To fund the work, a Building Safety Levy taking effect in October 2026 is expected to raise approximately £3.4 billion from developers.
If you live in a building with cladding concerns, these timelines matter. They determine when your building’s exterior will be assessed and, if needed, replaced, and they establish that the cost responsibility falls on building owners and developers rather than individual residents.
Maintenance by Material Type
How long your cladding lasts depends heavily on the material and how much attention you give it. Metal cladding is the lowest-maintenance option, needing only occasional cleaning and inspection of protective coatings. In coastal areas, check more frequently for signs of corrosion. Aluminium and steel systems routinely last 60 to 100 years.
Timber requires the most ongoing work. You’ll need to reseal or repaint it every few years, inspect for rot or insect damage, and address any cracking or warping before moisture gets behind the panels. When moisture penetrates wood and then dries out repeatedly, it leads to cracking, warping, and mold growth, so keeping the finish intact is essential. Well-maintained timber cladding rewards the effort with a lifespan of several decades, but neglected wood can deteriorate within 10 to 15 years.
Vinyl sits in between. It doesn’t rot or need painting, but it can become brittle over time, especially in extreme heat or cold. A periodic wash to prevent algae and dirt buildup is typically all it needs.