Windows & Joinery (Retrofit & Replacement)
Why Choose Us for Your Windows & Joinery (Retrofit & Replacement)?
4,8 Google Reviews
Our team brings years of experience with windows & joinery
Warmer, quieter homes
Retrofit double glazing improves thermal performance and reduces noise/condensation.
Right method for your frames
We advise when retrofit IGUs suit and when a full replacement makes more sense.
Code-aware detailing
Detailing follows NZ guidance for replacing/retrofitting windows in existing openings.
Clean install & finish
Careful sealing, trims and reveals for a tidy look inside and out. (Background: BRANZ guidance discusses fixings/reveals.)
How It Works
Installation is just the beginning — we're here for maintenance, questions, and future upgrades. Your comfort is our long-term commitment.
See What Our Customers Are Saying
“Quick, clean, and professional.”
Airthorne replaced our old AC system in just one day. The crew arrived on time, explained everything clearly, and left no mess behind. We noticed the difference immediately — the house has never felt this comfortable!
— Jessica R., Westfield
“Honest service you can trust.”
We had no heat during a cold snap, and Airthorne came through fast. They didn’t upsell or overcharge — just fixed the issue and made sure everything was working perfectly. Can’t recommend them enough.
— Tom M., Essex County
Things You Need to Know
Do you handle both residential and commercial projects?
Yes—our team delivers both, from planning through to maintenance.
Can you manage the building consent for me?
Yes—we prepare and lodge applications, then coordinate inspections.
How long do most upgrades take?
Scopes vary; our retrofit programme targets a 60-day turnaround from sign-off to handover.
Do you provide documentation I can share with owners/insurers?
Yes—progress photos, milestones and a summary on completion.
What areas do you service?
DNG and Retronew operates from Christchurch.
