How Long Do Aluminium Windows Last? (2026 Lifespan Guide)
How Long Do Aluminium Windows Last? Real Data + Buyer Checklist (2026)
Aluminium windows typically last 40–50 years when properly coated and maintained. The aluminium frame itself does not rot, warp, or corrode in normal conditions. What ages first—and what most buyers do not realize—is the powder coat surface and the hardware, not the aluminium itself.
How Long Do Aluminium Windows Last? A Component-by-Component Breakdown
- Aluminium frame: 40–50+ years (structurally sound in most conditions)
- Powder coat finish: 25–35 years inland; 15–25 years coastal
- Hardware (hinges, locks, rollers): 15–25 years, depending on usage and maintenance
- Double-glazed seal: 20–30 years (seal failure = condensation between panes)
- Thermal break: 40+ years (PA66 GF25 does not degrade under normal temperature conditions)
What shortens lifespan: Coastal salt exposure without AAMA 2605 coating; inadequate drainage causing water pooling in the frame channel; use of ACQ-treated timber in adjacent frames (accelerates galvanic corrosion); poor installation allowing water ingress behind the frame.
4 Key Factors That Determine Aluminium Window Lifespan
1. Powder Coat Specification (The Primary Lifespan Driver)
The powder coat is your window’s first line of defence and the component most exposed to weather. Two variables determine its longevity:
- Coating thickness: AAMA 2605 architectural specification requires a minimum 60 µm (microns) dry film thickness. Standard commercial coatings are 40–50 µm. In coastal environments, AAMA 2605 (60 µm) maintains film integrity for 3,000+ ASTM B117 salt spray hours, whereas standard coatings fail at ~1,000 hours.
- Powder type: TGIC polyester is standard architectural grade (15–20 year coastal life). FEVE fluoropolymer is premium (25–35 year coastal life), used in Starveil coastal-grade systems.
Starveil specification: All Starveil aluminium windows use a minimum of AAMA 2605 TGIC polyester powder coat (60 µm) as standard. Coastal-grade systems specify FEVE fluoropolymer (80 µm, 5,000-hour B117 rating).
2. Drainage System Quality
This is the factor most buyers and even some installers overlook. Aluminium window frames have internal drainage channels—small slots at the bottom of the frame that allow water entering the glazing channel to drain outside.
If these drainage slots are blocked during installation (common when installers foam the frame perimeter without protecting the drainage points), water pools inside the frame. Over 5–10 years, pooled water accelerates internal corrosion, which remains invisible until the window fails.
Starveil fix: All Starveil frames include a weep guard system with three drainage positions per sash, protected by a snap-in cover that prevents foam installation from blocking the channel.
3. Glass Seal Lifespan
The double-glazed unit (two panes of glass sealed with a spacer bar) has its own lifespan, typically 20–30 years before the seal fails, causing condensation between the glass layers.
When this happens, the glass unit needs replacement, not the whole window. This is a straightforward repair. Budget approximately USD 80–150 per sqm for a replacement double-glazed unit.
Seal lifespan depends on:
- Spacer bar type: Warm-edge thermoplastic spacers (TPS/SuperSpacer) outlast aluminium spacer bars by 5–10 years due to lower thermal stress.
- Desiccant quality: Molecular sieve is superior to standard silica gel.
- Primary seal quality: PIB (polyisobutylene) with a minimum 3 mm thickness.
4. Coastal vs. Inland Exposure
Proximity to the coast is the most significant environmental variable.
- Inland environments: AAMA 2605 powder coat maintains 90%+ of its initial gloss and colour for 25–35 years. The primary aging mechanism is UV exposure, not salt.
- Coastal environments (within 500 m of salt water): AAMA 2605 coating maintains integrity for 15–25 years. FEVE fluoropolymer extends this to 25–35 years. Salt spray attacks the coating at edges and impact points first.
Starveil coastal data: In 28 years of supplying coastal projects across the Gulf, Mediterranean, and Pacific markets, Starveil has recorded zero frame replacements due to corrosion on AAMA 2605-specification products maintained according to our care guide.
Lifespan Comparison: Aluminium vs. Alternatives
|
Factor
|
Aluminium
|
uPVC
|
Timber
|
|---|---|---|---|
|
Frame lifespan
|
40–50 years
|
20–25 years
|
30–40 years (with high maintenance)
|
|
Coating/maintenance
|
25–35 years (re-coat possible)
|
N/A (PVCu discolours)
|
5–10 years (paint/stain required)
|
|
Hardware lifespan
|
15–25 years
|
15–20 years
|
15–25 years
|
|
Glass seal lifespan
|
20–30 years
|
20–25 years
|
20–25 years
|
|
Coastal performance
|
Excellent (AAMA 2605)
|
Moderate
|
Poor (rot risk)
|
|
30-year maintenance cost
|
Low–Medium
|
Low
|
High
|
Before You Order: Lifespan Verification Checklist
Ask your supplier these five questions before placing an order:
- What is the powder coat specification and thickness? If they cannot answer with “AAMA 2605” and “µm” data, they are selling to price, not performance.
- Does the frame have a drainage system with protected weep points? If they do not know what weep guards are, that is a red flag.
- What is the spacer bar type in the double-glazed unit? Warm-edge thermoplastic spacers (TPS/SuperSpacer) extend seal life by 5–10 years vs. aluminium spacers.
- What is the thermal break material and width? PA66 GF25, minimum 24 mm wide, continuous perimeter. Anything less is a cost-reduced product.
- What hardware grade is specified? Class 3 rollers and hinges per EN 13451 minimum for domestic use. Class 5 for commercial or high-traffic.
How to Extend Your Windows’ Lifespan
Three maintenance actions, each taking under 15 minutes once a year, can extend the lifespan of your aluminium windows by 10–15 years:
- Annual track and drainage cleaning: Remove debris from the sliding track (if applicable) and confirm the drainage slots at the bottom of each frame are clear. Blocked drainage is the primary cause of premature internal corrosion.
- Hardware inspection: Check hinges and rollers for wear. Lubricate with a dry PTFE lubricant (not oil, which attracts dust). Tighten any loose screw fixings.
- Annual visual coating inspection: Look for stone chip damage or edge exposure on the powder coat. Touch up with a matching AAMA 2605-compliant repair lacquer (available from Starveil) within 3 months of identifying damage to prevent corrosion spreading beneath the film.
Why Choose Starveil for Long-Lasting Aluminium Windows?
Starveil aluminium windows carry a 10-year frame warranty, 10-year hardware warranty, and 5-year double-glazed unit warranty. Our documented coastal installations across 42 countries demonstrate AAMA 2605 coating integrity at 20+ years without replacement.
Frequently Asked Questions (FAQ)
Do aluminium windows rust?
Aluminium does not rust in the ferrous (iron) sense. It naturally forms a highly corrosion-resistant aluminium oxide layer. In coastal environments, the AAMA 2605 powder coat protects this layer from salt attack. Without adequate coating, aluminium can develop white oxidation (a powdery surface deposit), but proper powder coating prevents this entirely.
How often do aluminium windows need repainting?
Aluminium windows with AAMA 2605 powder coat should be inspected at 20–25 years and recoated at 25–35 years if the coating has degraded below 80% of its initial gloss. Professional re-coating is significantly cheaper than replacement, typically costing 30–40% of the replacement price.
What causes aluminium window frames to fail?
The most common causes of failure are: (1) coating degradation in coastal environments without adequate specification; (2) blocked drainage causing internal frame corrosion; (3) hardware wear (rollers, hinges) at 15–25 years; and (4) double-glazed seal failure at 20–30 years. Structural frame failure is extremely rare in properly specified aluminium.
Do thermal break windows last as long as non-thermal-break?
Yes. PA66 GF25 thermal break material is rated for 40+ years at normal temperature conditions. It does not degrade under standard heating or cooling cycles. The thermal break itself does not limit the overall window lifespan.
How long does a double-glazed unit last?
A quality double-glazed unit with a warm-edge spacer (TPS/SuperSpacer) lasts 25–30 years. Units with aluminium spacer bars typically last 20–25 years. Seal failure is indicated by condensation between the glass panes. When this occurs, the unit can be replaced without replacing the entire window frame.
Can you replace just the glass in aluminium windows?
Yes. Aluminium window frames are designed to allow glazing unit replacement. This is a standard maintenance procedure. Budget approximately USD 80–150 per sqm for a replacement double-glazed unit, depending on specifications.
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