- 28 September 2026|
- Windows|
- fenster_admin
If you are weighing up Aluclad windows against timber windows for a new build or a considered renovation, both are among the best windows you can specify. The decision comes down to how each performs over time, how much upkeep you will take on and what look you want.
This guide compares thermal performance, maintenance, lifespan and aesthetic appeal, then sets out where each window type earns its place: modern homes, period properties, conservation areas and coastal locations included.
What is the difference between Aluclad and timber windows?
Timber windows are built entirely from wood, typically FSC-certified redwood, hardwood or oak, finished with a protective coating. Aluclad windows use that same engineered timber core on the inside, wrapped in external aluminium cladding that takes the weathering so the wood does not have to.
In practice:
- Timber windows give you natural grain, warmth of timber and traditional character, inside and out.
- Aluclad windows give you that same warmth of timber inside, with the structural integrity and low maintenance of an aluminium exterior.
Neither is a compromise version of the other. Both answer the same brief: a high performance window frame that still feels like a natural material to live with.
Thermal performance and energy efficiency
According to the Glass and Glazing Federation, a substantial share of a UK home’s heat is lost through old, underperforming windows. Specifying new windows properly is one of the most direct ways to cut heat loss and improve long term running costs.
Heat transfer and thermal breaks
Our Aluclad range is built around thermal breaks within the aluminium cladding that stop cold bridging between the exterior and interior frame. Combined with triple glazing, warm edge spacer bars and argon-filled cavities, our Aluclad Passivhaus windows achieve U-values as low as 0.79 W/m²K, among the best thermal performance figures available in a bespoke window frame.
Timber is a strong performer too. Solid wood is a naturally poor conductor of heat, so a timber frame window fitted with triple glazing offers excellent thermal insulation without needing a thermal break at all. Our Triple Glazed Sash Windows and Traditional Casement Windows bring this performance to period-style properties without altering their appearance.
For the very highest thermal efficiency, particularly on Passivhaus projects, Aluclad windows currently have the edge on excellent thermal performance. For most other projects, a well-specified timber window will deliver excellent energy efficiency and better insulation than whatever it is replacing.
Maintenance: Myth versus reality
Do timber windows need a lot of maintenance?
Not as much as reputation suggests. Modern timber windows use FSC-certified timber and factory-applied micro-porous coatings, needing little beyond routine cleaning and occasional inspection rather than constant repainting.
That said, timber does need some attention over its life: periodic checks of the coating and recoating every decade or so depending on exposure. It is minimal maintenance, not zero maintenance.
Aluclad windows go a step further. The external aluminium is powder coated in any RAL colour and simply does not rot, warp or need repainting, so maintenance is close to zero. For homeowners who want peace of mind without a maintenance schedule, this is the main reason Aluclad windows are specified so often on new build projects.
Durability in harsh weather conditions
Both window types are built for the UK climate, but they get there differently. In coastal areas, where salt-laden air and driving rain accelerate wear on any exposed material, the aluminium exterior shrugs off harsh weather conditions with no risk of rot, making Aluclad the ideal choice for coastal locations and exposed sites.
Traditional timber windows, properly finished, still perform well in the same conditions, though it asks a little more of the homeowner in return. Many of the country’s oldest surviving sash windows are timber, proof that structural integrity and longevity do not depend on an aluminium exterior.
Aesthetic appeal: Modern homes and period properties
Aluclad windows suit contemporary new builds and extensions where you want a crisp, contemporary look, slim sightlines and generous natural light, with a bold exterior colour that would be impractical on painted timber.
Timber windows remain the natural choice for conservation areas and listed buildings, where planners expect original profiles and genuine timber. Our Heritage Sash Windows are built to original Georgian and Victorian profiles, and our Vacuum Glazed Sash Windows bring modern warmth to listed properties without changing their external appearance.
Which window type suits your project?
- Choose Aluclad windows for new build and contemporary extensions, Passivhaus projects, coastal or exposed sites and anywhere you want minimal maintenance with a bold exterior finish.
- Choose timber windows for listed buildings, conservation areas and period renovations or any project where planning conditions call for genuine wooden windows inside and out.
Key takeaways
- Timber windows and Aluclad windows share the same warm timber interior; the difference is what protects the exterior.
- Aluclad windows offer the lowest maintenance and the highest thermal performance, with U-values as low as 0.79 W/m²K on our Passivhaus range.
- Timber windows, properly specified, can still deliver excellent thermal insulation and a genuine lifespan measured in decades.
- Coastal areas and harsh weather conditions generally favour Aluclad windows for superior durability.
- Conservation areas and heritage projects generally call for traditional timber windows.
Still weighing up window types for your project? Get in touch for technical advice, product information or to request a quote.
