Window Replacement Cost Calculator — NZ

An aluminium double-glazed window unit in NZ typically costs $600–$1,500 installed, depending on size and glazing spec. Standard-size windows into existing openings sit toward the lower end; larger windows or premium Low-E/argon glazing push it toward $1,500.

A full house re-window in NZ typically costs $15,000–$45,000+, depending on the number and size of windows, glazing spec, and whether frames are standard aluminium or premium thermally-broken systems. A small home (under 10 windows) is usually $15,000–$22,000; a larger home (16+ windows) can reach $40,000+.

For most NZ homes, yes — double glazing significantly reduces heat loss, condensation and outside noise compared to single glazing, and is required by the Building Code (H1 clause) for new windows in most new builds and major renovations. The payback on heating costs alone can take years, but the comfort and condensation improvement is usually noticeable immediately.

Standard double glazing is two panes of clear glass with an air or gas gap. Low-E (low emissivity) glass has a microscopically thin coating that reflects heat back into the room in winter and blocks heat gain in summer, and is often paired with argon gas fill for better insulation — it costs more but performs noticeably better in NZ's climate, especially in colder regions.

Yes — installing new windows or external doors in NZ homes is restricted building work requiring a Licensed Building Practitioner (LBP). This matters for compliance and for insurance/resale — always check LBP status on the public register before engaging an installer.

Choose per-window or full-house mode and enter the details. The estimate is a planning-stage range for 2026 NZ pricing — actual quotes depend on window size, frame material, glazing performance spec, and whether the opening needs structural changes. Get written quotes from LBP-registered installers specifying exact glass and frame performance ratings.