New windows are one of the best investments you can make in a NZ home — they reduce heat loss, cut condensation, and quieten street noise. Here's what window installation costs in NZ in 2026, what affects the price, and how to find qualified installers.
Window Installation Cost Quick Reference
| Window type | Supply + install (per window) |
|---|---|
| Aluminium single glazed (standard size) | $600–$1,200 |
| Aluminium double glazed (standard size) | $900–$1,800 |
| uPVC double glazed (standard size) | $1,000–$2,000 |
| Timber double glazed (standard size) | $1,500–$3,500 |
| Aluminium double glazed (large, e.g. 1800×1200) | $1,500–$3,000 |
| Sliding door (double glazed, aluminium) | $2,500–$5,000 |
| Bi-fold doors (double glazed, 3 panel) | $5,000–$12,000 |
| Skylight (fixed, double glazed) | $1,500–$3,500 installed |
| Louvre window (aluminium) | $500–$1,000 |
All prices include supply, installation, and flashing. Excludes building consent fees and any plastering or interior finishing. Auckland 10–20% above these figures.
Labour Cost for Window Installation
Window installation labour (installer only, you supply the windows) typically runs:
- Standard window replacement (like-for-like): $300–$600 per window
- New opening in existing wall: $600–$1,500 per window (includes framing, lintel, lining)
- Large window or bi-fold: $800–$2,500
Labour rates vary by region. Most window installers quote per window rather than by the hour.
Aluminium vs uPVC vs Timber Windows in NZ
Aluminium is by far the most common window material in NZ residential construction. Reasons: durable, low maintenance, available from many local suppliers (Altherm, Vantage, Metro), and familiar to NZ builders. Good thermally broken aluminium is competitive with uPVC for performance.
Downside: Standard (non-thermally broken) aluminium conducts cold — the frame itself becomes a cold bridge. Thermally broken aluminium adds 20–40% to the frame cost but significantly improves performance.
uPVC (unplasticised PVC) is popular in Europe and increasingly in NZ. Excellent insulation performance, no cold bridging, no maintenance painting required. Available in white and wood-look finishes.
Downside: Limited local supply chains compared to aluminium. Some uPVC suppliers are importers — lead times can be longer and warranty claims more complex. Not all uPVC window companies in NZ have been in business long.
Timber windows are the premium option — beautiful, warm to the touch, and excellent insulation. Traditional NZ villas often have timber joinery that should be matched with timber replacements in heritage areas.
Downside: Require regular painting and maintenance (every 5–10 years). Cost significantly more. Not suitable for high-humidity environments without correct finishing.
Double Glazing vs Single Glazing
The NZ Building Code (H1 Energy Efficiency) now requires double glazing in all new residential consented work. For retrofits, single glazing is still permitted but double glazing is almost always worth the extra $200–$400 per window:
| Feature | Single glazed | Double glazed |
|---|---|---|
| U-value (heat loss) | ~5.8 W/m²K | ~2.6–3.0 W/m²K |
| Condensation | High (cold glass surface) | Significantly reduced |
| Sound insulation | Poor | Moderate (better with laminated glass) |
| NZ Building Code new builds | Does not comply | Required for consented work |
For retrofit/replacement windows in an existing building that isn't being consented, single glazing may still be installed legally — but double glazing pays back through lower heating bills in most NZ climates within 5–8 years.
Building Consent for Window Installation in NZ
Whether you need a building consent depends on the nature of the work:
| Scenario | Consent required? |
|---|---|
| Like-for-like replacement (same size, same opening) | No — exempt under Schedule 1 |
| Enlarging an existing opening | Yes — structural work |
| New window in a new opening | Yes — structural work |
| Window in a load-bearing wall | Yes |
| Window on upper storey (height risk) | Yes in most cases |
| Heritage-listed building | Usually yes — check with council |
"Like-for-like" means the same opening size and same location in the wall. Changing from single to double glazing in the same opening is like-for-like and does not require consent.
When consent is required, work must comply with NZ Building Code Clause H1 (energy efficiency), E2 (external moisture), and structural requirements. An LBP-licensed builder or registered window company typically manages this.
The Window Replacement Process
- Measure and quote — window companies send a measurer who confirms opening sizes, recommends window specifications, and provides a detailed quote
- Order — lead times for custom aluminium windows: typically 4–8 weeks from factory. Stock sizes are faster.
- Preparation — installer checks the opening, removes old window, checks the frame and sill for rot or moisture damage (if found, this is extra cost)
- Installation — new window fitted, flashed, and sealed
- Interior finishing — stopping, painting, and trims. Sometimes done by the window company, sometimes by a separate plasterer and painter
Common extra cost: Rot in the framing around old windows. When old windows come out, rot in the frame around them is sometimes found. Framing repair adds $200–$800 per window in typical cases — budget for this contingency.
Getting the Best Window Installation Quotes
Before getting quotes: - Measure each opening (width × height in mm) - Note whether it's single or double glazed currently - Note the existing frame material (aluminium, timber, steel) - Decide on your preference: aluminium, uPVC, or timber - Decide on glass type (clear, tinted, frosted, laminated, acoustic)
Questions to ask: 1. Is thermally broken aluminium included or standard aluminium? 2. What's the U-value of the glass package? 3. Is flashing and sealing included? 4. Who does the interior finishing (stopping and painting)? 5. What's the warranty on the window and on the installation? 6. Do you manage building consent if required?
Red flags: - Quote that doesn't specify glass type or U-value - No mention of flashing - No written quote before work starts - Very short lead time on custom-size windows (could be stock or imports with no local backup)
Find window installers near you: Window Installers NZ | Post Your Job Free
Frequently Asked Questions
How much does it cost to replace all windows in a NZ house? A typical 3-bedroom NZ house has 12–18 windows. At $900–$1,800 per double-glazed aluminium window (supply + install), total cost is $12,000–$30,000. Larger homes with bi-folds or architectural glazing are higher. Timber windows are 50–100% more per window.
Is double glazing worth it in NZ? Yes, for most NZ homes. Double glazing reduces heat loss through windows by approximately 50%, cuts condensation significantly, and reduces noise. In Auckland's mild climate payback is slower; in Christchurch, Wellington, or Otago the payback is faster due to longer heating seasons.
Do I need a building consent to replace windows in NZ? For like-for-like replacements (same opening, same size), no — this is exempt from building consent under Schedule 1 of the Building Act. For new openings, enlarged openings, or windows in load-bearing walls, a building consent is required.
How long does window installation take? A typical 1–2 day job for a whole-house window replacement (10–15 windows), assuming the openings are ready and no rot is found. Lead time from order to installation is typically 4–8 weeks for custom aluminium windows.
What is thermally broken aluminium? Standard aluminium window frames have no insulation break between the inner and outer frame — cold conducts straight through. Thermally broken frames have a layer of insulating material between the inner and outer aluminium, dramatically reducing cold bridging and condensation on the frame. Required for H1 compliance in cold climate zones; recommended everywhere.
Related: Window Replacement Cost NZ | Double Glazing NZ Guide | Post a Job Free