Aluminium Retrofit Double Glazing Christchurch
Upgrade your existing single-glazed aluminium windows to double glazing — keep the frames you have, improve warmth and condensation control, at a lower cost than full replacement.
Free frame assessments across Christchurch, Selwyn & Waimakariri.
What Is Aluminium Retrofit Double Glazing?
Aluminium retrofit double glazing replaces the single pane in your existing aluminium frame with a new insulated glass unit, keeping the frame itself in place. It’s a common, cost-effective upgrade for Christchurch homes with sound aluminium joinery from the 1980s onward.
Important: retrofit upgrades the glass, not the frame. It will not turn an older aluminium frame into a modern thermally broken system — see the limitations section below for an honest look at what retrofit can and can’t do.
Is Your Aluminium Window Suitable?
Sound Frame Condition
No corrosion, pitting, or structural damage to the frame or joints.
Working Drainage
Weep holes and drainage still clear and functioning, so moisture doesn't build up inside the frame.
Sashes That Operate Properly
Sliding and opening sections that still move, seal, and lock as intended.
Not sure? Our retrofit suitability checklist covers this in more detail.
Sliding Windows & Doors
Sliding aluminium windows and doors are common across Christchurch and can often be retrofitted, provided the track and frame are in good condition and can take the added weight of an insulated glass unit. We check hardware and rollers as part of the assessment, since heavier glass sometimes needs a hardware upgrade to keep sliding smoothly.
What We Check Before Recommending Aluminium Retrofit
- Frame and joint condition — checking for corrosion or structural damage
- Drainage — making sure weep holes and drainage channels are clear
- Bead removal method — how the existing glazing bead comes out and the new one is fitted
- Glass unit thickness — what the frame can safely accommodate
- Hardware and rollers — whether sliding sections need attention to handle the heavier glass
- Colour match — keeping the frame finish consistent once new beads are fitted
An Honest Look at the Limitations
Retrofit genuinely improves glass performance, but it doesn’t change the frame. Older aluminium without a thermal break can still conduct cold, so the frame itself may stay noticeably cooler than a modern thermally broken system even after the glass is upgraded.
If frame-level cold and condensation are the main issue — not just the glass — full window replacement with a thermally broken frame may be a better long-term fit. We’ll talk through both options honestly at the assessment.
Glass Options: Low-E and Argon-Filled Units
Where the frame allows, Low-E glass and argon-filled units are available as an upgrade on aluminium retrofit projects, for better winter warmth and reduced glare. We’ll confirm what your specific frames can take during the assessment. See our Low-E glass guide for more detail.
How Aluminium Retrofit Works
Assess & Measure
We check frame condition, drainage, and hardware, and give you an honest suitability call.
Manufacture
Your insulated glass units are made to size and specification for each opening.
Install & Finish
New glass is fitted into the existing frame with new beads, sealed and checked for a tidy result.
Aluminium Retrofit Cost in Christchurch
Aluminium retrofit is usually the lower-cost retrofit option, since it typically needs less preparation than timber.
- Aluminium retrofit: $400–$850 per window
- Whole-home projects: commonly $5,000–$25,000+, depending on size and glass specification
All prices include GST. See our full cost guide for a detailed breakdown, or get an instant estimate.
Aluminium Retrofit Service Area
GlacierLite provides aluminium retrofit double glazing across Christchurch, Selwyn, and Waimakariri, including:
RiccartonHornbyPapanuiHalswellShirleySt AlbansMerivaleFendaltonSydenhamAddingtonCashmereRollestonLincolnRangioraKaiapoi
In Selwyn? We’re based in Lincoln — see our Selwyn retrofit double glazing page.
Frequently Asked Questions
Yes, in many cases — provided the frame is sound, drainage works, and the sashes still operate properly. We check this at a free site assessment.
Usually, yes. Aluminium retrofit is often 30-60% cheaper than full window replacement because the existing frame is retained rather than removed.
Yes — retrofit upgrades the glass, not the frame. Older aluminium without a thermal break can still conduct some cold even after the glass is upgraded. If frame-level cold is the main concern, full replacement with a thermally broken frame may suit better.
It depends on the number of windows and glass specification — most of the lead time is in manufacturing the glass units to size. We’ll give you a realistic timeframe as part of your quote.
No — suitability depends on frame condition, drainage, and whether the frame can safely take the new glass thickness. We give an honest assessment rather than assume every window qualifies.
Generally very little — the existing frame and sightlines stay the same, with new beads finished to match the existing colour.
This depends on your specific frame’s rebate depth, which we measure during the assessment before confirming glass specification.
In many cases, yes, where the frame allows. We’ll confirm what’s suitable for your specific windows during the site assessment.
Ask Whether Your Aluminium Windows Are Suitable
Book a free assessment and we’ll give you an honest answer on retrofit suitability — or get an instant online estimate first.