Double Glazing Cost Calculator

Your Home Details

1 Room count and frame material mix

Number of rooms/areas included in your project

8 rooms

What material are your window frames made of?

Mostly timber

Window Size/Style

2 What size/style are the majority of windows in this project?

Your project window size and style

Small (Older) Standard Large (Modern) Larger Floor-to-Ceiling

Modern

Estimated glass area: 0.0 m²

Project Type

3 What kind of upgrade do you want?

Retrofit

New double glazing units into existing frames

Full Replacement

Complete new windows and frames

Mixed Project

Some retrofit + some replacement (adds cost variability)

If you're unsure what you need, try our Window Advisor to get a personalised retrofit vs replacement recommendation for your home

Project Options/Factors

4 Do any of these apply to your project?

Supertherm Glass

Low-E coating, better heat retention, UV protection, noise reduction

Enhanced Noise Reduction

Acoustic glazing for traffic, neighbourhood, or environmental noise

Complex Installation

Two-storey+ home, difficult access, scaffolding needed

Repair work

Repair rotting/rusted frames, replace broken hardware

Your Likely Project Range

$15,000 – $25,000

Based on previous years of project data. Prices vary by site conditions and selections. This is not a quote.

Project Cost Distribution

Shaded area shows your likely cost range based on similar NZ projects

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Window wisdom.

Can all timber window frames be retrofitted with double glazing?

You’re wanting to upgrade the comfort of your home with genuine double glazing, but are you worried that you will have to lose your beautiful natural timber joinery?

Our experience is that most timber window and door frames can be retrofitted, and the outcome may have you looking hard to try and spot the changes. This is because the process makes use of the design of your existing window frames. Read more here…

Should I retrofit or replace my windows?

Deciding whether to retrofit or replace your windows and doors can feel confusing, draining, or even overwhelming.

Retrofit double glazing uses your existing aluminium frames, replacing the old single glazing with new double glazing, whereas replacement double glazing involves removing both the existing glass and frames of your aluminium or timber windows and doors, replacing them with thermally enhanced joinery. Read more here…

What is Retrofit Double Glazing?

Have you heard this term so many times but you still have no idea what retrofit double glazing actually is? Let us help!

Retrofit double glazing is the process of retrospectively fitting new energy-efficient double glazing into existing window frames that previously held single-pane glazing. Read more here….

What is the WEERS rating?

Changes to Clause H1 in the NZ Building Code require homes to achieve a minimum energy performance. WEERS, or the Window Energy Efficiency Rating System, enables you to accurately assess the energy efficiency of the windows or glazed doors you choose. Visit the WGANZ site or read more here…

RetroGLAZE Double Glazing Cost Calculator