Napier's mix of Art Deco villas, mid-century bungalows and newer builds means single glazing is still common across large parts of the city, and windows remain the weakest thermal element in most older Hawke's Bay homes. Whether you need a full frame replacement or a retrofit/secondary glazing solution fitted into your existing joinery, these are the double glazing installers that verified as genuine, currently operating businesses serving Napier.
This page highlights the Top 5 double glazing installers in Napier, based on independent research into reputation, accreditation, service quality and overall reliability.
The top 5 double glazing installers in Napier are 1. Twin City Aluminium Ltd, 2. RetroFit Double Glazing - Metro Direct Napier, 3. O'Brien's Aluminium & Maintenance Ltd (Next Windows and Doors Napier), 4. Clive Glass Limited, 5. MagicSeal Hawkes Bay. Below we explain why each made the list, compare them at a glance, and share how to choose.
This paid placement sits above the editorial Top 5 and is clearly labelled. It does not influence the rankings below.
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An independently confirmed WGANZ (Window & Glass Association New Zealand) member, listed on the association's own member directory with a five-star Google rating. Twin City is also the local Nulook aluminium joinery licensee and an associate member of Registered Master Builders, giving it two layers of independently checkable industry backing rather than just its own marketing claims.
Operates from a genuine Napier premises at 9 Niven Street, Onekawa (formerly trading as Hawkes Bay Glass), as the local branch of the RetroFit Double Glazing brand owned by NZX-listed Metro Performance Glass. Units are factory sealed and locally processed with a 10-year manufacturer warranty, giving a level of manufacturing traceability smaller operators can't match.
A registered New Zealand company (NZBN 9429041696040) trading from its own Napier premises at 27 Austin Street, Onekawa, and the local fabricator for the Next Windows & Doors network. Independent customer feedback across multiple platforms consistently mentions professional installation and clear communication on double glazing insert and retrofit jobs.
A registered company (NZBN 9429049192445) trading since 1988 and family-owned since 2000, based just outside Napier in Clive and explicitly servicing Napier, Hastings and Havelock North. Its approved-repairer status with multiple major insurers (IAG, AMI, Vero, Suncorp, AA, Tower, FMG) is independently checkable evidence of a genuine, long-trading glazing operator rather than a marketing-only site.
Operates from a genuine Napier (Taradale) premises as the regional branch of Magicseal (NZ) Limited, a company registered since 1990 (formerly trading as Custom Screens (NZ) Limited). Independent reviews across several platforms consistently describe secondary glazing installs that noticeably reduced draughts, condensation and outside noise, which is the specific problem this specialist installer targets.
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 |
|---|---|
| Twin City Aluminium Ltd | Homeowners who want an industry-body-verified installer for full frame replacement joinery |
| RetroFit Double Glazing - Metro Direct Napier | Homeowners who want a nationally backed retrofit brand with local Napier premises |
| O'Brien's Aluminium & Maintenance Ltd (Next Windows and Doors Napier) | Napier homeowners wanting a locally based fabricator for aluminium retrofit and inserts |
| Clive Glass Limited | Homeowners who want an established, insurer-vetted local glazier for retrofit double glazing |
| MagicSeal Hawkes Bay | Homeowners wanting secondary glazing fitted into existing frames without a full window replacement |
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.
Since May 2023, the NZ Building Code (Clause H1) has required a minimum window and door R-value of R0.46 in Napier's climate zone, up from R0.37 previously. That's still well below the R-values required for walls and roofs, which is why windows stay the weakest thermal element in most Hawke's Bay homes even after other insulation upgrades. Any glazing installed also has to meet NZS 4223, the New Zealand standard covering glass selection and design (Part 1) and human-impact safety for glazing within 2000mm of floor level (Part 3), so it's worth asking a prospective installer how they meet both.
Look for a company that can independently verify its credentials rather than just asserting them: WGANZ (Window & Glass Association New Zealand) membership, a registered NZBN company name, and a genuine physical Napier or Hawke's Bay premises rather than just a service-area page. It's also worth understanding which approach suits your home: full frame replacement swaps out the entire window unit for new double-glazed aluminium or timber joinery, while retrofit or secondary glazing fits an additional glazed unit into your existing frames, generally at lower cost and disruption. One thing to be clear on: unlike insulation and heat pumps, there is currently no EECA Warmer Kiwi Homes grant that covers double glazing or window glazing work, so budget for the full cost of the job.
Cost depends heavily on whether you choose full frame replacement or retrofit/secondary glazing, the number and size of windows, and frame material (aluminium vs timber). Retrofit and secondary glazing options are generally the more budget-friendly route since they reuse your existing frames, while full replacement joinery costs more but replaces the entire window system. Get itemised quotes from at least two or three installers on this list to compare like for like.
No. Unlike insulation and heat pumps, which can be funded through EECA's Warmer Kiwi Homes programme, double glazing and window glazing work is explicitly excluded from that scheme. There is currently no EECA grant that covers double glazing installation in New Zealand, so this is a cost homeowners need to budget for directly.
Full frame replacement removes your existing window frame entirely and installs new double-glazed aluminium or timber joinery, which is more thorough but more expensive and disruptive. Retrofit (or secondary) double glazing fits a second glazed panel into or alongside your existing frame without replacing it, which is typically cheaper, faster, and well suited to older or heritage homes such as Napier's Art Deco housing stock where preserving the original joinery matters.
A retrofit or secondary glazing job on an average Napier 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, both because units need to be custom manufactured off-site first (often several weeks' lead time) and because the physical installation and any building consent sign-off take longer than a retrofit.
Yes, particularly given how much of Napier's housing stock, including its Art Deco heritage homes, was built well before double glazing was standard. Retrofit and secondary glazing options exist specifically to add thermal and noise performance to older timber and aluminium frames without altering their appearance, which suits heritage streetscapes where full frame replacement may not be appropriate or affordable.
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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