AluK vs Crystal Windows
Crystal Windows
Average Price
£850
AluK
£560
Crystal Windows
U-Value
1.1 W/m²K
AluK
1.3 W/m²K
Crystal Windows
Warranty
20.0 years
AluK
10.0 years
Crystal Windows
Customer Rating
4.5/5
AluK
4.1/5
Crystal Windows
AluK vs Crystal Windows: Summary
When comparing AluK and Crystal Windows windows, several key differences emerge. AluK, established in 1994, offers windows with an average U-Value of 1.1 W/m²K at an average price of £850. Meanwhile, Crystal Windows windows average 1.3 W/m²K U-Value at £560.
AluK windows come with an average warranty of 20.0 years, compared to Crystal Windows's 10.0 years. Customer satisfaction ratings show AluK leading with 4.5/5, while reliability scores give AluK a slight edge.
Both manufacturers offer smart glazing technology and produce windows suitable for different property types. Both are based in United Kingdom.
Detailed Comparison
Who Should Choose AluK
- Those prioritizing energy efficiency with better U-Value
- Tech-savvy homeowners wanting smart glazing features
- Those who prefer to support UK manufacturing
- Homeowners looking for classic casement window designs
Who Should Choose Crystal Windows
- Those looking for windows with strong performance
Scenario Fit: Which Brand Fits Your Situation?
Best for budget-first upgrades
Crystal Windows is generally the lower upfront-cost option in this comparison.
- • Better for large multi-window projects with tighter budget caps
- • Useful when payback speed matters more than premium extras
- • Pair with installer quote comparisons to lock value
Best for long-term ownership
AluK currently leads on warranty depth in this matchup.
- • Better fit if you plan to stay in the home 10+ years
- • Prioritises lower maintenance surprises over time
- • Stronger risk control for exposed or high-traffic elevations
| Decision Lens | Likely Better Choice | Why |
|---|---|---|
| Upfront budget | Crystal Windows | Lower average price in this pair. |
| Energy performance | AluK | Lower U-Value typically means stronger heat retention. |
| Maintenance risk framing | AluK | Longer average warranty can reduce long-tail ownership risk. |
| User-rated confidence | AluK | Higher customer satisfaction score in current data. |
Popular Window Models
AluK Popular Models
| Model | Type | Material | Rating | U-Value | Price |
|---|---|---|---|---|---|
| Optio 58BD | Casement | Aluminum | A+ | 1.1 W/m²K | £700 |
| SL52 Sliding | Sliding | Aluminum | A | 1.2 W/m²K | £1000 |
Crystal Windows Popular Models
| Model | Type | Material | Rating | U-Value | Price |
|---|---|---|---|---|---|
| RapidFit Elite | Casement | uPVC | A+ | 0.8 W/m²K | £550 |
| AcousticPro | Tilt & Turn | uPVC | A | 0.9 W/m²K | £750 |
Approved Installers
AluK Installers
AluK Approved Fabricators
Approved Fabricators
Crystal Windows Installers
No installer data available
Energy Efficiency & Cost Savings
More energy-efficient windows can significantly reduce your heating bills. Based on average UK energy prices and a typical 3-bedroom house:
AluK
Average U-Value
1.1 W/m²K
Lower is better for heat retention
Energy Rating
A+
Estimated Annual Energy Savings
£327
Compared to older single-glazed windows (typical U-Value 5.8)
Crystal Windows
Average U-Value
1.3 W/m²K
Lower is better for heat retention
Energy Rating
A
Estimated Annual Energy Savings
£300
Compared to older single-glazed windows (typical U-Value 5.8)
Frequently Asked Questions
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