Whanganui is a smaller regional market, so the genuine pool of double glazing specialists here is tighter than in a major centre. Rather than pad the list with national franchise landing pages that have no real Whanganui premises, we've verified a small number of locally based glaziers and joinery businesses that actually install and stand behind their work in the city.
This page highlights the top double glazing installers in Whanganui, based on independent research into reputation, accreditation, service quality and overall reliability.
The top 4 double glazing installers in Whanganui are 1. Wanganui Glass 2010 Ltd, 2. Get Glazed Ltd (Rylock Whanganui / DualGlaze Wanganui), 3. Rivercity Building & Aluminium, 4. Central Glass Wanganui. Below we explain why each made the list, compare them at a glance, and share how to choose.
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A locally owned and operated glazier established in 1996, with a confirmed WGANZ (Window & Glass Association NZ) membership and a five-star Google rating across 85 reviews. The team of six covers both retrofit and full replacement double glazing into aluminium and timber frames.
A registered Whanganui joinery and glazing company (Get Glazed Joinery Maintenance Limited) operating from premises on Heads Road, Castlecliff, trading as Rylock Whanganui for full replacement aluminium joinery and DualGlaze Wanganui for retrofit double glazing. Confirmed WGANZ member with a five-star Google rating from 60+ reviews.
A registered Whanganui aluminium joinery fabricator (NZBN 9429041953372) with a showroom on Wilson Street, led by a Licensed Building Practitioner. Fabricates and installs Omega Windows and Doors, covering both retrofit double glazing and full replacement residential and commercial joinery.
A locally owned glass and glazing business on St Hill Street, offering retrofit double glazing with Low-E glass plus a wider 24-hour emergency glazing service across the Whanganui, Ohakune, Raetihi, Taihape and Marton area.
A quick comparison of our Top 4 picks. Select up to 3 businesses above to compare their strengths side by side.
| Double Glazing Installer | Best for |
|---|---|
| Wanganui Glass 2010 Ltd | Homeowners wanting an established, association-verified local glazier for either frame replacement or retrofit |
| Get Glazed Ltd (Rylock Whanganui / DualGlaze Wanganui) | Homeowners who want to directly compare full replacement vs retrofit options from one local operator |
| Rivercity Building & Aluminium | Larger or architectural joinery projects needing bespoke aluminium window and door fabrication |
| Central Glass Wanganui | Homeowners in outlying Whanganui-district towns who also want a local emergency glass-repair contact |
Independent, editorial, and reviewed regularly.
TopChoice rankings are editorially curated by our New Zealand team and reviewed periodically. We don't host our own reviews. Our shortlists draw on public reputation signals from Google and other platforms, alongside our own research into each double glazing installer. We weigh up a combination of:
We don't accept payment in exchange for a place in the Top 4. Featured placements are separate and always clearly labelled. Rankings may change over time as businesses evolve.
Windows remain the weakest thermal element in most New Zealand homes, and the rules tightened in May 2023: under Building Code Clause H1, new and replacement windows and doors now need a minimum R-value of R0.46 (Whanganui sits in climate zone 2-3), up from R0.37 previously. Any installer working on a consented job should be able to show how their glazing meets this. Safety matters too - glazing installed within 2000mm of floor level needs to meet the human-impact requirements of NZS 4223 Part 3, not just the glass-selection rules in Part 1. Checking a business is a current WGANZ (Window & Glass Association New Zealand) member is a reasonable proxy for an installer who takes these standards seriously, since membership requires ongoing compliance with the association's code of practice.
There are two genuinely different ways to double glaze an existing Whanganui home. Full frame replacement swaps out the entire window unit, frame included, and is the most thorough (and most expensive) option, well suited to older timber-framed villas and bungalows where the frames themselves are tired. Retrofit or secondary glazing - the approach used by systems like RetroFit Double Glazing and Magnetite, and by several Whanganui installers under their own retrofit brands - fits new glazing into the existing frame, which is faster, less disruptive and considerably cheaper. One thing to be clear on: unlike insulation or heat pumps, there is currently no EECA Warmer Kiwi Homes grant that covers double glazing, so get a firm, itemised quote and compare it against at least one other genuine local installer before committing.
Cost depends heavily on whether you choose retrofit or full frame replacement, how many windows are involved, and the glass specification. Retrofit double glazing into existing frames is the cheaper option since the frames themselves are reused; full replacement aluminium or timber joinery costs more but replaces tired frames as well as the glass. Get itemised, like-for-like quotes from at least two local installers before deciding.
No. EECA's Warmer Kiwi Homes scheme funds ceiling and underfloor insulation and heat pumps for eligible homes, but it does not cover double glazing or window replacement. Some installers reference finance options or payment plans, which are worth asking about directly, but there is currently no government grant specifically for windows or glazing.
Full frame replacement removes the entire existing window, frame and all, and installs a new double-glazed unit - the most thorough option, often needed on older or deteriorated frames. Retrofit (or secondary) double glazing fits new double-glazed glass, beads and sashes into your existing frame, which is faster, less disruptive and generally cheaper, provided the existing frame is still sound.
A retrofit double glazing job on a typical home can often be completed in one to two days once measured and manufactured, since the existing frames stay in place. Full frame replacement takes longer on-site and may involve a longer lead time for manufacturing the new joinery, particularly for larger homes or bespoke designs.
Yes, in most cases. Whanganui has a significant stock of older timber villas and bungalows built well before double glazing was standard, and windows are typically the weakest thermal point in these homes. Since the May 2023 update to Building Code Clause H1, minimum window R-values are considerably higher than the pre-2023 standard, and retrofit systems in particular make it possible to upgrade an older home's windows without replacing the original frames.
Editorial disclosure: TopChoice is an independent editorial platform. Some pages may include clearly labelled featured placements for additional visibility. Featured placements do not influence rankings within our Top 4 lists.
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