Window replacement is one of the most impactful upgrades in a NZ home — for thermal comfort, noise reduction, condensation control, and security. It's also one where prices vary enormously depending on frame material, glazing type, and installer. Here's what window replacement costs in NZ in 2026.
Window Replacement Cost Quick Reference
| Window type | Supply only (per window) | Supply + install (per window) |
|---|---|---|
| Aluminium single glazed (standard size) | $350–$700 | $600–$1,200 |
| Aluminium double glazed (standard size) | $700–$1,400 | $1,000–$2,200 |
| uPVC double glazed (standard size) | $800–$1,600 | $1,200–$2,500 |
| Timber double glazed (standard size) | $1,200–$2,500 | $1,800–$3,800 |
| Aluminium double glazed (large/custom) | $1,400–$3,000 | $2,000–$4,500 |
Standard size: approximately 900mm × 1200mm. Custom sizes, shapes, and high-specification glazing will cost more. Prices ex-GST.
Whole-house cost (3-bedroom home, 12–18 windows): - Aluminium double glazed: $15,000–$35,000 - uPVC double glazed: $18,000–$42,000 - Timber double glazed: $28,000–$65,000
Frame Materials Explained
Aluminium
The most common window frame in NZ. Lightweight, strong, low maintenance, and widely available. Standard aluminium is conductive (poor thermal break) — cold in winter. "Thermally broken" aluminium windows have a plastic barrier between inner and outer frame that significantly reduces heat transfer; cost $150–$300 more per window than standard aluminium.
For NZ's climate: thermally broken aluminium is the recommended specification for any window replacement in 2026. Standard (non-thermal break) aluminium doesn't meet the intent of the current H1 energy efficiency code for new builds — though existing homes replacing like-for-like aren't always required to upgrade.
Brands: Altus (Metro Performance Glass), Fairview, Ryno, Fletcher Aluminium.
uPVC (Vinyl)
Plastic frame with excellent thermal performance, no condensation on the frame (unlike aluminium), and very low maintenance (no painting). Heavier than aluminium; more common in Europe and the US but growing in NZ. Slightly more expensive than standard aluminium, less expensive than high-spec thermally-broken aluminium.
Brands: Decorative Glass, Thermakraft, Altus, Vantage.
Timber
Excellent thermal performance, traditional aesthetic, suits heritage and character homes. Higher cost, requires regular painting or oiling to prevent rot. Not ideal for wet climates (Westland, Northland) without excellent maintenance regimes.
Common for: Villas, bungalows, character homes where aluminium would look out of place.
Glazing Types
Single Glazed
One pane of glass. Minimum thermal performance. Legal for replacement of existing single-glazed windows in existing homes. Not appropriate for new builds (doesn't meet H1). R-value approximately 0.13 — very poor.
Double Glazed (Insulated Glass Unit / IGU)
Two panes with an air or gas-filled gap (typically 12mm–20mm). Standard in new NZ builds since approximately 2008, mandatory since 2023 H1 update. R-value approximately 0.3–0.5 depending on gap and glass type.
Low-E coating: A metallic coating on the glass that reflects heat back into the room in winter (and blocks solar heat gain in summer). Adds $80–$150 per window but significantly improves thermal performance. Standard in most quality double-glazed windows in NZ.
Argon gas fill: The gap is filled with argon (denser than air, better insulator) instead of air. Marginal improvement; more common in premium units.
Triple Glazed
Three panes. R-values of 0.6–0.8. Common in Scandinavia and Germany; available in NZ but expensive. Not commonly specified in NZ residential — the climate doesn't justify the cost premium over double glazed with Low-E for most locations except very cold southern areas.
What Else Affects the Price
Window size and shape: Bay windows, arched windows, and custom shapes require custom manufacturing — add 30–100% to standard rectangular pricing.
Opening type: Awning, casement, slider, fixed, tilt-and-turn. Fixed (non-opening) windows are cheapest. Awning and casement require more hardware.
Install complexity: Removing existing frames (especially timber frames bonded into masonry or plaster) adds cost. New openings in existing walls require LBP and building consent — this is structural work, not just a window swap.
High-level windows: Windows above ground level require scaffolding or a ladder-safe work platform — add $400–$1,200 for scaffolding if needed.
Building consent: Replacing windows in the same opening with the same size: generally no consent required. Enlarging an opening or creating a new opening: consent required. Always check with your council duty planner for free advice.
Location: Auckland is consistently 15–20% more expensive than regional NZ. Remote sites add freight.
Warmer Kiwi Homes and Double Glazing
EECA's Warmer Kiwi Homes programme currently focuses on insulation and heating (heat pumps and clean heaters) — double glazing is not directly subsidised under this programme as of June 2026. Check eeca.govt.nz for any updates.
However, for rental properties, the Healthy Homes Standards require adequate insulation but don't mandate double glazing — though energy-efficient windows contribute to the standard's intent around thermal performance.
The ROI Case for Double Glazing in NZ
Double glazing pays back through: - Heating cost savings: 15–30% reduction in heating costs for well-sealed double-glazed homes - Condensation control: Significantly less winter condensation (a major mould driver in NZ homes) - Comfort: No cold draughts from single-glazed windows - Property value: Double glazing is now expected by buyers in most NZ markets — single glazing is a negative at sale - Health: Less condensation = less mould = better respiratory health
Payback period on a typical NZ retrofit: 8–15 years on energy costs alone. On comfort and property value, the argument is stronger.
Getting Quotes
Window replacement quotes vary significantly — sometimes by $8,000–$15,000 on a whole-house job. To compare properly:
- Get 3 quotes minimum — from specialist window companies, not just general builders
- Specify the glazing exactly: double glazed, Low-E, argon or air, glass thickness
- Confirm what's included: supply, installation, removal of old windows, disposal, any touch-up plastering or painting around frames
- Ask about lead time: Most NZ window manufacturers are 4–8 weeks. Custom sizes can be 10–12 weeks.
- Check the warranty: Frame (typically 10 years), IGU seal (typically 5–10 years), glass breakage (usually excluded)
Find window installers near you: Window Installers NZ
Get quotes: Post Your Job Free
Frequently Asked Questions
How much does it cost to replace all windows in a house NZ? A 3-bedroom NZ house with 12–18 windows: $15,000–$35,000 for aluminium double glazed, $18,000–$42,000 for uPVC double glazed. Custom shapes, large windows, or premium glazing push the high end significantly higher.
Is it worth replacing single glazed windows in NZ? Yes, for most NZ homes. The comfort improvement is immediate and significant, condensation reduces dramatically, and double glazing is now expected by buyers. The financial payback on heating costs alone is 8–15 years, but quality of life improvement is immediate.
Do I need consent to replace windows in NZ? Replacing windows in the same opening with the same size: generally exempt from consent under Schedule 1 Building Act 2004 (like-for-like replacement). Enlarging an opening or creating new openings: building consent required. Check with your council duty planner.
What is the best window frame for NZ? Thermally broken aluminium (cost-effective, low maintenance, good thermal performance) or uPVC (best thermal performance, low maintenance, no condensation on frame) are the best all-round choices for most NZ homes in 2026. Timber is best for heritage/character properties where appearance matters.
How long does window replacement take? A typical 3-bedroom house: 1–3 days for standard rectangular windows. Complex shapes, large windows, or access difficulties extend this. Scaffolding setup/removal adds half a day. Most jobs are complete within a week from start to finish including site clean-up.
Related: Window Installers NZ | Home Insulation NZ | Renovation vs New Build NZ