Wood · Wood-Aluminium · PVC/Vinyl · Aluminium · PVC-Aluminium · Steel — an honest, data-driven comparison of every window frame material on the US market. Know what you're specifying.
Jump to Full Comparison TableEach material has strengths and trade-offs. Here's what matters when you're choosing windows for a US project.
The original window material — and still the best thermal insulator known. European laminated wood profiles combine centuries of craftsmanship with modern engineering: finger-jointed, kiln-dried, dimensionally stable, and FSC certified.
The best of both worlds. Solid laminated wood interior (80 mm) for thermal performance and beauty, with a 20 mm aluminium cladding on the exterior that eliminates facade maintenance for 25+ years. Full RAL color chart.
The workhorse of the US window market — affordable, maintenance-free, and widely available. But PVC has fundamental limitations in thermal performance, lifespan, aesthetics, and environmental impact that matter in premium projects.
Slim profiles, high strength, and a modern aesthetic. Popular in US commercial buildings and contemporary residential. But aluminium is a thermal conductor — even with thermal breaks, it cannot match wood or PVC thermal performance.
A composite solution: PVC structural core with aluminium exterior cladding for improved aesthetics and weather resistance. Better-looking than pure PVC, but inherits most PVC limitations — shorter lifespan, petroleum-based, limited thermal performance.
Ultra-narrow sightlines and industrial aesthetic make steel windows the darling of luxury loft conversions and modern farmhouse projects in the US. Beautiful — but thermally poor and extremely expensive.
All six materials, side by side. Scroll horizontally on mobile.
| Property | Wood | Wood-Alu | PVC / Vinyl | Aluminium | PVC-Alu | Steel |
|---|---|---|---|---|---|---|
| Thermal conductivity (W/mK) | 0.13 | 0.13 | 0.40 | 160 | 0.40 | 50 |
| Best Uw (W/m²K) | 0.83 | 0.83 | ~1.2 | ~1.4 | ~1.1 | ~1.8–2.5 |
| US U-Factor (best) | ~0.15 | ~0.15 | ~0.21 | ~0.25 | ~0.20 | ~0.32+ |
| Passive House suitable | Yes | Yes | Difficult | No | Marginal | No |
| Lifespan (years) | 50–80+ | 50–80+ | 20–30 | 30–50 | 25–35 | 40–60+ |
| Exterior maintenance | Every 5–8 yrs | Zero (25+ yrs) | None | None | None | Rust prevention |
| Sound insulation | Excellent | Excellent | Moderate | Poor–Moderate | Moderate | Poor |
| Design flexibility | Unlimited | Unlimited | Very limited | Good | Moderate | High (welded) |
| Shapes (arch, round, etc.) | All shapes | All shapes | Very limited | Some | Limited | Most shapes |
| Color options | Stain/paint, any | Full RAL + wood | White/tan/few | Powder coat RAL | RAL on alu skin | Paint/powder coat |
| Profile sightline | Medium | Medium | Wide (thick frames) | Slim | Medium-wide | Ultra-slim |
| Tilt-and-turn available | Standard | Standard | European only | European only | Some models | Rare |
| Sustainability / LEED | FSC · Carbon-negative | FSC · Alu recyclable | Petroleum plastic | High embodied energy | Petroleum + metal | High embodied energy |
| End-of-life recyclability | 100% biodegradable | Separable, recyclable | Difficult | Highly recyclable | Difficult (composite) | Fully recyclable |
| Condensation resistance | Excellent | Excellent | Good | Poor (cold bridge) | Good | Poor (cold bridge) |
| Fire resistance | Moderate (charring) | Moderate | Low (melts, toxic fumes) | High (non-combustible) | Low (PVC core melts) | Highest |
| Historic preservation approved | Preferred / Required | Case by case | Rarely accepted | Sometimes | Rarely | Often accepted |
| Typical US price | $$$–$$$$ | $$$$ | $–$$ | $$–$$$ | $$–$$$ | $$$$$ |
| Emotional / resale value | Very high | Very high | Low (commodity) | Moderate | Moderate | High (design statement) |
How well each material conducts heat through the frame. Lower = better insulator. This is the single most important factor in window energy performance.
The gold standard. Wood is a natural insulator. 3x better than PVC, 385x better than steel, 1,230x better than aluminium.
Decent insulator, but 3x worse than wood. Multi-chamber profiles help, but can't overcome the material's fundamental limitation.
385x worse than wood. Thermal breaks help, but steel frames remain significant cold bridges. Condensation is a real problem.
1,230x worse than wood. Even the best thermal breaks can't fully compensate. Aluminium is the worst insulator of all window materials.
Our honest recommendation for each common US project type.
When the budget allows quality and the client expects the best. Wood delivers unmatched warmth, performance, and design freedom. Every window custom-made. No compromises.
Winner: European WoodOnly wood and wood-aluminium consistently achieve Uw below 0.85 without oversized profiles. The AVANT 92 mm at Uw 0.83 is purpose-built for this segment.
Winner: Wood (AVANT 92)Salt air, wind-driven rain, no access for exterior maintenance. Wood-aluminium gives you wood's thermal performance inside with bomb-proof aluminium outside. Zero maintenance for 25+ years.
Winner: Wood-AluminiumMost preservation commissions require or strongly prefer wood. PVC and aluminium are often rejected. IBERADRIA replicates any historic profile with modern thermal performance.
Winner: European WoodFor premium developments that need differentiation: wood-aluminium. For standard developments: PVC wins on cost. The right choice depends on positioning.
Winner: Wood-Alu (premium) / PVC (standard)If the look is everything and the ultra-slim sightline is non-negotiable, steel wins aesthetically. But consider: IBERADRIA wood-aluminium in matte black RAL 9005 delivers a similar visual with vastly superior thermal performance.
Alternative: Wood-Alu RAL 9005If thermal performance matters, wood wins. No material comes close to wood's natural insulating properties. Combined with European engineering — laminated profiles, triple glazing, krypton gas, TGI spacers — IBERADRIA wood windows achieve U-factors that PVC, aluminium, and steel simply cannot match.
If maintenance is a concern, wood-aluminium solves it. The aluminium cladding eliminates the one historical disadvantage of wood windows (exterior repainting) while preserving all thermal and aesthetic benefits.
PVC/vinyl has its place — in budget-conscious projects where cost per unit is the deciding factor. But for any project where performance, longevity, design, sustainability, or resale value matter, wood and wood-aluminium are the professional's choice.
Aluminium and steel serve specific aesthetic niches (slim sightlines, industrial look) but their thermal performance makes them poor choices for energy-focused projects.
The US market is shifting toward higher performance standards — driven by stricter energy codes, Passive House adoption, LEED requirements, and informed clients. European wood windows aren't a trend. They're the future.
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