Tauranga's mix of older single-glazed aluminium joinery and newer builds means homeowners here have two real paths to a warmer, quieter home: retrofitting double glazing into existing frames, or replacing the joinery outright. We've verified the installers below against registered business identity, WGANZ membership where it could be confirmed, and independent customer reviews.
This page highlights the Top 5 double glazing installers in Tauranga, based on independent research into reputation, accreditation, service quality and overall reliability.
The top 5 double glazing installers in Tauranga are 1. RetroFit Double Glazing – Bay of Plenty, 2. Bay Glass & Glazing Ltd, 3. Ryan Double Glazing, 4. Kiwi Double Glazing (BOP) Ltd, 5. Window Replacement Company (WRC). Below we explain why each made the list, compare them at a glance, and share how to choose.
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RetroFit Double Glazing operates as a division of Metro Performance Glass, New Zealand's largest glass manufacturer and a listed WGANZ member, with more than 35 years in the retrofit glazing industry. Its dedicated Tauriko branch at 14 Taitimu Road services Tauranga through to Rotorua and Whitianga, and every installation carries a 10-year manufacturer warranty on both aluminium and timber retrofit units.
A confirmed WGANZ member (registered NZBN 9429034532447) operating from its own Tauriko premises at 52 Whakakake Street, Bay Glass & Glazing has built a 4.8-star Google rating from local customers as an NZ-owned-and-operated glazing business.
Trading as Ryan Double Glazing under registered entity DGU Limited, this specialist has retrofitted aluminium windows and doors across the Bay of Plenty since 1994 - over 30 years - operating from its own purpose-built facility in Mount Maunganui, with an owner-backed workmanship guarantee.
A confirmed WGANZ member operating as its own Bay of Plenty entity from a dedicated branch at Unit 1/43 Enterprise Drive, Papamoa, Kiwi Double Glazing (BOP) Ltd is the local arm of the wider Kiwi Double Glazing retrofit network, with local customer feedback citing responsive service and fair pricing.
Operating from its own premises at 43 Hewletts Road, Mount Maunganui, WRC specialises in full frame window and door replacement rather than retrofit units, sourcing joinery from established New Zealand manufacturers Vantage and APL (Metro, Architectural and Thermal Heart ranges), with a final quality check by its head installer on every job.
A quick comparison of our Top 5 picks. Select up to 3 businesses above to compare their strengths side by side.
| Double Glazing Installer | Best for |
|---|---|
| RetroFit Double Glazing – Bay of Plenty | Homeowners who want the scale and warranty backing of NZ's largest glass manufacturer behind a retrofit job |
| Bay Glass & Glazing Ltd | Homeowners wanting a locally registered, WGANZ-member glazier for retrofit double glazing |
| Ryan Double Glazing | Retrofitting double glazing into older existing aluminium window and door frames |
| Kiwi Double Glazing (BOP) Ltd | Retrofit double glazing for Papamoa and the eastern Tauranga suburbs |
| Window Replacement Company (WRC) | Full frame window and door replacement rather than retrofitting into existing joinery |
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 5. 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 since May 2023 the Building Code's Clause H1 has required new and replaced windows and doors to meet a minimum R-value of R0.46 in Tauranga's climate zone - up from R0.37 previously. That's worth asking about directly: a genuine installer should be able to tell you the R-value of what they're proposing, not just quote a brand name. The glass itself should also comply with NZS 4223, the New Zealand standard covering glass selection and design (Part 1) and human-impact safety glazing within 2000mm of floor level (Part 3) - relevant anywhere with low windows, ranch sliders or glazed doors.
There are two genuinely different approaches on this list. Full frame replacement swaps out the entire window or door joinery for new double-glazed aluminium or timber units - a bigger job, but the only real option if the existing frames are damaged, single-glazed timber, or simply due for renewal. Retrofit (or secondary) double glazing fits a new sealed glazing unit into your existing frames, which is faster and cheaper but depends on the existing joinery being sound. Where an installer holds WGANZ (Window & Glass Association New Zealand) membership, we've noted it - it's a genuine independent trade credential, not a guarantee of quality on its own, but a useful signal alongside real reviews. One thing to be clear on: unlike insulation or heat pumps, there is no EECA Warmer Kiwi Homes grant for double glazing - budget for it as a standalone investment.
Cost depends heavily on approach and scale. Retrofit double glazing into existing frames is generally cheaper per window than full frame replacement, since it reuses the existing joinery. Full replacement costs more but is often the only option for damaged or single-glazed timber frames. Get quotes from at least two or three installers on this list, specifying the same rooms and glass spec, so the numbers are genuinely comparable.
No. Unlike ceiling and underfloor insulation or heat pumps, which can be funded through EECA's Warmer Kiwi Homes scheme for eligible homeowners, double glazing and window glazing generally are explicitly excluded from that programme. Budget for double glazing as a standalone cost rather than expecting a subsidy.
Full frame replacement removes your existing window or door joinery entirely and installs new double-glazed aluminium or timber frames - necessary if the existing frames are damaged, rotten, or single-glazed timber that can't take a retrofit unit. Retrofit (or secondary) double glazing fits a new sealed double-glazed unit into your existing frames, which is usually faster and less disruptive but only works where the existing joinery is sound.
A retrofit job on a standard home is often completed within a day or two once measured and manufactured, since the existing frames stay in place. Full frame replacement takes longer per window and may involve building consent, especially for larger renovations. Ask your installer for a specific timeframe once they've assessed your property.
Often yes. Older Tauranga homes with single-glazed aluminium joinery lose a significant amount of heat through their windows, and since the 2023 update to Building Code Clause H1, new glazing must meet a minimum R0.46 in this climate zone - a useful benchmark even for a voluntary retrofit. Retrofit double glazing is usually the more cost-effective route for an older home with sound existing frames, while homes with damaged or timber single-glazed joinery may get better long-term value from full replacement.
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 5 lists.
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