You've narrowed it down to three premium frame materials: full aluminum, wood, or the hybrid - aluclad (wood interior, aluminum exterior). All three deliver high performance. All three are available in European systems through my network. But they serve different projects, different budgets, and different maintenance realities.
Here's a direct comparison based on what I see across U.S. residential and light commercial projects.
The Three Materials at a Glance
| Feature | Aluminum (Thermally Broken) | Aluclad (Wood + Aluminum) | Wood |
|---|---|---|---|
| Interior finish | Powder coat / anodized | Natural wood (oak, pine, meranti) | Natural wood |
| Exterior finish | Powder coat / anodized | Aluminum clad (any RAL color) | Paint or stain |
| Sightline width | Slimmest (1.5-2.5") | Moderate (2.5-3.5") | Widest (3-4") |
| Typical U-factor | 0.18-0.30 | 0.16-0.25 | 0.20-0.30 |
| Service life | 50-60+ years | 40-50+ years | 30-50 years (with maintenance) |
| Exterior maintenance | Near zero | Near zero | Every 5-10 years |
| Interior maintenance | None | Periodic wood treatment | Periodic wood treatment |
| Max panel sizes | Largest | Moderate | Smallest |
| DP rating capability | Highest | Moderate to high | Moderate |
| Cost tier | $$$ | $$$$ | $$-$$$ |
Full Aluminum
What it is. Extruded aluminum profiles with polyamide thermal breaks. Both interior and exterior surfaces are aluminum with factory-applied finishes.
Why choose it:
- Slimmest possible sightlines - ideal for contemporary architecture and steel-look aesthetics
- Highest structural performance at large sizes - handles the biggest glass panels with the thinnest frames
- Virtually zero maintenance inside and out
- Full RAL color range, dual-color options, anodized finishes
- Longest service life of any frame material
Where it fits: Modern architecture, commercial-grade residential, coastal projects, high-rise, any project where slim frames and maximum glass area drive the design.
Trade-off: No natural warmth of wood on the interior. Aluminum reads "modern" - for traditional or transitional projects, that may not be the right look.
For a deeper comparison between aluminum and other materials, see my aluminum vs PVC vs vinyl guide.
Aluclad (Wood-Aluminum)
What it is. A structural wood frame (typically pine, oak, or meranti) clad on the exterior with aluminum. You get wood on the inside, aluminum on the outside.
Why choose it:
- Natural wood interior adds warmth and richness - ideal for traditional, transitional, and high-end residential
- Aluminum exterior eliminates the #1 wood window problem: exterior maintenance
- Best thermal performance of the three - wood + thermal break + aluminum = excellent U-factors
- Can be stained or painted on the interior to match millwork and trim
Where it fits: Luxury custom homes where the client wants the warmth of wood inside but refuses to accept exterior painting schedules. Traditional or transitional architecture where aluminum reads too modern. Passive house projects where every fraction of U-factor matters.
Trade-off: Thicker profiles mean wider sightlines - not ideal for minimalist contemporary design. Higher price point than full aluminum. Wood interior still needs periodic attention (oil, stain, or lacquer refresh every few years).
Full Wood
What it is. Solid wood frames - typically pine, oak, larch, or meranti - painted or stained inside and out.
Why choose it:
- Warmest aesthetic, both inside and outside - nothing else matches the look of painted or stained wood
- Natural insulator - wood itself is a decent thermal barrier
- Matches historical and preservation requirements where aluminum exteriors aren't permitted
- Can be refinished and restored
Where it fits: Historical renovations, landmark districts with material restrictions, projects where the exterior wood aesthetic is a non-negotiable design element. See the NFRC & NAFS guide for compliance documentation across all three materials.
Trade-off: Exterior maintenance is the elephant in the room. Every 5-10 years, exterior wood needs refinishing. In harsh climates (coastal, high UV, freeze-thaw), the cycle is shorter. Over a 30-year ownership period, maintenance costs can equal or exceed the original window cost. That's not a knock on the product - it's the reality of exposed wood.
My perspective: For most new construction, aluclad gives you everything wood does on the interior while solving the maintenance problem on the exterior. Full wood makes sense when the exterior appearance or preservation rules require it. Otherwise, aluclad is the smarter long-term play.
Cost Comparison
Ballpark pricing for a typical high-end residential project (15-25 mixed units, tilt-turn + fixed):
| Material | Relative Cost | Landed DDP to U.S. |
|---|---|---|
| European aluminum | $$$ (base) | Competitive with U.S. premium brands |
| European wood | $$-$$$ | Depends heavily on species and finish |
| European aluclad | $$$$ (15-30% above aluminum) | Premium, but well below U.S. aluclad brands |
| U.S. premium wood/clad | $$$$$ | Retail / dealer pricing |
Aluclad carries a premium over full aluminum, but the gap narrows when you factor in lifecycle costs - aluminum's zero exterior maintenance vs. aluclad's near-zero vs. wood's significant recurring expense.
European aluclad sourced through my network is typically 30-50% below equivalent U.S. wood-clad brands on a DDP landed basis. That makes it a realistic option for projects that might otherwise default to domestic wood-clad out of habit. For current duty rates, see my 2026 tariff guide.
Decision Framework
Choose aluminum when:
- Design is contemporary or modern
- Slim sightlines and maximum glass are priorities
- Large panel sizes or high DP ratings required
- Low maintenance is a selling point (multifamily, rental, commercial)
Choose aluclad when:
- Client wants wood warmth inside but won't maintain exterior
- Traditional or transitional architecture
- Passive house or ultra-low U-factor target
- Budget exists for the premium
Choose wood when:
- Historical district or preservation requirements dictate exterior material
- The exterior wood look is a core design element
- Client understands and accepts the maintenance commitment
FAQ
Is aluclad heavier than aluminum? Yes. The wood core adds weight, which can limit maximum panel sizes compared to full aluminum. For very large openings (lift-and-slide, bi-fold, oversized fixed panels), aluminum is usually the better structural choice.
Can I get aluclad in the same colors as aluminum? The exterior aluminum cladding accepts any RAL powder coat finish, same as full aluminum. The interior wood can be stained, oiled, lacquered, or painted. So you get full color flexibility on both sides.
Which material has the best resale value? It depends on the market. In contemporary luxury, slim aluminum frames are a selling feature. In traditional markets, wood warmth (via aluclad) resonates with buyers. Both outperform vinyl or basic builder-grade windows at resale. The key is matching the material to the project's architectural identity.
Not sure which frame material fits your project? Send me your elevations and design intent - I'll recommend the right material for each elevation and quote accordingly. Request a Quote | Schedule a Call
Kai, your window guy!