Standard Aluminium Window Sizes: Guide by Type & Market
What Are Standard Aluminium Window Sizes?
There is no single universal standard aluminium window size. What exists instead are common size ranges defined by regional building codes, manufacturing conventions, and the practical structural limits of aluminium fenestration. These ranges overlap across markets but differ in metric vs imperial units, common proportions, and code requirements.
The single most important number to know: 2,500 mm width per sash is the structural engineering threshold above which most aluminium window systems require an engineering review. Below it, standard production sizes apply; above it, custom engineering begins. This guide lists the standard aluminium window sizes by market and by window type so you can match your opening to the right specification.
Standard Aluminium Window Sizes: Quick Reference by Market
The table below summarises the standard aluminium window sizes across the four largest export markets at a glance.
|
Market
|
Common Width Range
|
Common Height Range
|
Governing Standard
|
|---|---|---|---|
|
USA (imperial)
|
24–72 inches
|
36–96 inches
|
ANSI Z97.1 / AAMA
|
|
UK
|
600–2,400 mm
|
900–2,400 mm
|
BS EN 14351-1
|
|
EU (continental)
|
600–2,100 mm
|
600–2,400 mm
|
EN 14351-1 / CE marking
|
|
Australia
|
600–2,400 mm
|
600–2,340 mm
|
AS 2047
|
US Standard Aluminium Window Sizes
US residential aluminium windows are specified in imperial dimensions, following rough-opening conventions that assume 2×4 or 2×6 stud construction with standard framing depths of 3.5–5.5 inches.
Common Fixed Window Sizes (US)
|
Rough Opening
|
Glazed Area (approx.)
|
Common Use
|
|---|---|---|
|
24 × 24 inches
|
20 × 20 inches
|
Bathroom, utility
|
|
36 × 48 inches
|
32 × 44 inches
|
Bedroom, kitchen
|
|
48 × 48 inches
|
44 × 44 inches
|
Living room feature
|
|
60 × 60 inches
|
56 × 56 inches
|
Large fixed pane
|
|
72 × 72 inches
|
68 × 68 inches
|
Statement window
|
Common Casement Window Sizes (US)
|
Rough Opening
|
Configuration
|
Notes
|
|---|---|---|
|
24 × 36 inches
|
Single casement
|
Standard bedroom
|
|
36 × 48 inches
|
Single or picture
|
Kitchen, dining
|
|
48 × 60 inches
|
Picture + flanking casements
|
Living room
|
|
72 × 72 inches
|
Triple casement
|
Large elevations
|
US code notes: Florida and coastal states require impact-rated glazing for windows within 1 mile of the coast. ASTM E1996 and AAMA 506 govern these impact requirements.
UK and EU Standard Aluminium Window Sizes
UK and EU markets use metric dimensions, with common standard aluminium window sizes derived from the 100 mm increment convention used across European construction. BS EN 14351-1 governs performance, including U-value requirements, air infiltration limits (Class 4 maximum), and water penetration resistance.
Common UK Casement Window Sizes
|
Order Dimension
|
Configuration
|
Typical Room
|
|---|---|---|
|
600 × 900 mm
|
Single casement
|
Bathroom, utility
|
|
900 × 1,200 mm
|
Single casement
|
Bedroom
|
|
1,200 × 1,200 mm
|
Single or picture
|
Bathroom, bedroom
|
|
1,200 × 1,500 mm
|
Single casement
|
Kitchen
|
|
1,800 × 1,200 mm
|
Top-light + bottom-light
|
Living room
|
|
2,400 × 1,500 mm
|
Triple casement
|
Large living room
|
Common European (Metric) Window Sizes
Continental European production follows similar standard aluminium window sizes but with finer metric increments available:
- Widths: 600, 700, 800, 900, 1,000, 1,200, 1,500, 1,800, 2,100, 2,400 mm
- Heights: 600, 700, 800, 900, 1,000, 1,200, 1,500, 1,800, 2,100, 2,400 mm
The 2,500 mm Structural Threshold
This is the specification point most standard size charts omit. For 6063-T6 aluminium:
- Under 2,500 mm per sash: Standard production, no structural reinforcement required.
- 2,500–3,000 mm per sash: Engineering review required; may need a reinforced sash section or structural mullion.
- Above 3,000 mm per sash: Structural support bar or mullion required—this becomes a custom engineering project.
Starveil production note: Starveil standard production covers apertures from 300 × 300 mm to 2,500 × 2,700 mm per sash. Above 2,500 mm we provide structural engineering documentation as part of the standard quotation.
Standard Aluminium Window Sizes by Window Type
Fixed Windows (Picture Windows)
Fixed windows do not open—they are pure glazed panels. With no operating mechanism, they can be larger than equivalent opening windows without the structural constraints of hinges and locks.
|
Standard Range
|
Max Standard Size
|
Custom Range
|
|---|---|---|
|
300–2,400 mm wide
|
3,000 × 2,700 mm
|
Up to 6,000 × 3,000 mm (structural review)
|
|
300–2,400 mm tall
|
Limited by glass unit size
|
Above 2,700 mm: laminated / toughened structural glass
|
Casement Windows
Hinged on the side, casement windows are the most common opening type. Standard production covers:
|
Width
|
Height
|
Configuration
|
|---|---|---|
|
450–1,800 mm
|
450–1,500 mm
|
Single casement
|
|
900–2,400 mm
|
900–1,500 mm
|
Double casement (side-by-side)
|
|
1,800–2,400 mm
|
900–1,500 mm
|
Triple casement
|
Awning Windows
Hinged at the top, awning windows sit above fixed windows or at height (above head height) where casement operation is not accessible. Standard ranges mirror casement sizes, with slightly narrower maximum widths due to hinge engineering constraints.
Sliding Windows
Common in Australia, Southeast Asia, and North America. Standard sizes:
|
Configuration
|
Width Range
|
Height Range
|
|---|---|---|
|
Single sliding
|
600–1,800 mm
|
600–1,500 mm
|
|
Double sliding
|
1,200–2,400 mm
|
600–1,500 mm
|
Bifold / Folding Windows
Less common than bifold doors, bifold windows fold open to create a near-full horizontal opening. Standard production ranges are narrower:
|
Configuration
|
Width Range
|
Height Range
|
|---|---|---|
|
2-panel bifold
|
1,200–3,000 mm
|
600–2,400 mm
|
|
3-panel bifold
|
1,800–4,500 mm
|
600–2,400 mm
|
When to Specify Custom Sizes (Beyond Standard Aluminium Window Sizes)
Standard sizes fit roughly 80% of residential openings. The remaining 20%—typically renovation projects, non-standard architectural openings, or large contemporary builds—require custom sizing.
Specify custom when:
- Your structural opening exceeds 2,400 mm in either dimension
- Your opening has non-standard proportions (very tall and narrow, or very wide and short)
- Your wall depth is outside the standard 100–250 mm range
- You want glass-only (no visible frame) for architectural effect
- Your project needs a specific sightline dimension standard sizes cannot achieve
Custom size trade-offs:
- Cost premium: 20–40% above standard production pricing
- Lead time: 4–8 weeks additional for custom tooling and engineering
- Engineering documentation: Required above 2,500 mm per sash
The architectural case for custom: On large contemporary projects, a 100 mm change in frame width across a 6,000 mm glazed wall saves 600 mm² of framing—measurably improving the glass-to-frame ratio. On large apertures, custom sizing is not a luxury; it is an architectural requirement.
Regional Building Code Requirements
UK (Building Regulations Part L and Q)
- Part L (Conservation of Fuel and Power): Uw maximum 1.6 W/m²K for replacement windows in existing dwellings (as of 2022).
- Part Q (Security): PAS 24 Enhanced Security required for windows in easily accessible locations (ground floor, roof terrace).
- Document Q compliance: Multi-point locking, laminated or toughened glass.
EU (CE Marking / Energy Performance of Buildings Directive)
- EN 14351-1: Mandatory CE marking for all windows sold in the EU.
- EPBD (2018/844/EU): U-value limits vary by member state; most require Uw below 1.5 W/m²K for new builds.
- AAMA 2605: Not mandatory in the EU, but increasingly specified by architects as the quality benchmark.
Australia (NCC Volume 2 / AS 2047)
- NCC Section J: Energy efficiency requirements for all new residential buildings.
- AS 2047: Performance requirements including water penetration (minimum 150 Pa), air infiltration, and operating force.
- Bushfire BAL ratings: AS 3959 governs window specifications in bushfire-prone areas—Starveil supplies systems rated to BAL-FZ (the highest bushfire attack level).
Why Choose Starveil?
Starveil manufactures aluminium windows in standard and custom sizes from 300 × 300 mm to 6,000 × 3,000 mm per configuration. Standard production covers apertures up to 2,500 × 2,700 mm; custom engineering documentation is included for all sizes above this threshold.
Frequently Asked Questions (FAQ)
What is the standard aluminium window size in the UK?
The most common UK standard aluminium window size is 1,200 × 1,200 mm for single casements. Standard UK production typically ranges from 600 mm to 2,400 mm in both width and height, following the 100 mm increment convention.
What are the largest standard aluminium windows?
Standard production aluminium fixed windows reach approximately 2,400 × 2,700 mm. Standard casement windows reach about 1,800 × 1,500 mm per sash. Anything above these dimensions moves out of the standard aluminium window sizes and into custom engineering.
Can aluminium windows be made to any size?
Aluminium windows can be made to most custom dimensions, but structural constraints apply above 2,500 mm per sash for standard 6063-T6 aluminium. Starveil provides structural engineering documentation for all custom sizes above this threshold.
What is the minimum size for an aluminium window?
Starveil’s minimum standard production is 300 × 300 mm (a small fixed pane). Smaller sizes are possible but need custom tooling and are typically used for ventilation panes, roof windows, or architectural feature panels.
How do I know if my opening needs a structural mullion?
If your opening exceeds 2,500 mm in width for a single sash, or your wind load zone exceeds 50 kg/m² (coastal or high-rise), a structural mullion or support bar is required. Share your project location and aperture dimensions with Starveil for a free engineering assessment.
What building code applies to aluminium windows?
It depends on location. UK: BS EN 14351-1 plus Building Regs Part L/Q. EU: EN 14351-1 with CE marking. US: AAMA/NFRC standards and local codes. AU: AS 2047 and NCC Section J. Starveil provides certified documentation for all major market standards.
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