New Plymouth's older villas, bungalows and coastal homes are still mostly single-glazed, so windows are usually the weakest link for warmth, condensation and noise, even after insulation is topped up. We've researched and verified the double glazing installers actually operating in and around New Plymouth, checking registration, industry membership and independent reviews rather than just search rankings.
This page highlights the Top 5 double glazing installers in New Plymouth, based on independent research into reputation, accreditation, service quality and overall reliability.
The top 5 double glazing installers in New Plymouth are 1. The Glass Man, 2. Fisher Taranaki Window & Door Centre, 3. RetroFit Double Glazing (Metro Direct New Plymouth), 4. ProGlaze, 5. Altherm Taranaki. Below we explain why each made the list, compare them at a glance, and share how to choose.
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A WGANZ (Window & Glass Association NZ) member with a confirmed 5-star rating from 132 Google reviews, The Glass Man has been locally owned and operated in Spotswood for over 30 years. It's a licensed installer of the Thermawood retrofit double glazing system and also handles full glazing replacement, making it one of the few genuinely full-service, verified operators in Taranaki.
The local New Plymouth branch of the established Fisher Windows & Doors network, based at 50 Rimu Street, Fitzroy. Confirmed as a WGANZ member with a 5-star rating from 25 Google reviews, Fisher Taranaki specialises in supplying and installing double-glazed aluminium window and door joinery for full frame replacements.
RetroFit Double Glazing is a subsidiary of NZX-listed Metro Performance Glass and describes itself as the largest retrofit double glazing company in New Zealand. The New Plymouth branch operates from 9 Oropuriri Road, Waiwhakaiho, supplies Metro-manufactured glazed units with a 10-year warranty, and has an established local showroom and installation team.
ProGlaze Ltd is a registered New Zealand company (NZBN 9429030340060, incorporated 2013), owned and directed by Ben Clarke and based in Vogeltown, New Plymouth. It's a family-run local glazing business specialising in retrofit double glazing alongside general residential glazing, with a strong local reputation on Facebook (100% recommend from 22 reviews).
Altherm Taranaki Limited is a registered NZ company and long-standing WGANZ member based at 53a Rimu Street, New Plymouth, manufacturing and installing Altherm's ThermalHEART aluminium window and door systems. The business has won regional industry awards for residential double-glazed joinery projects in New Plymouth, evidencing genuine installation quality beyond marketing claims.
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 |
|---|---|
| The Glass Man | Homeowners wanting a WGANZ-verified installer that covers both retrofit and full window/door glazing |
| Fisher Taranaki Window & Door Centre | Homeowners wanting complete new aluminium double-glazed joinery rather than retrofit units |
| RetroFit Double Glazing (Metro Direct New Plymouth) | Homeowners who want a nationally backed brand with manufacturer warranty support |
| ProGlaze | Homeowners wanting a small, locally owned specialist for retrofit double glazing |
| Altherm Taranaki | New builds or full renovations wanting new thermally efficient aluminium 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.
Since May 2023, the Building Code's Clause H1 has required a minimum window and door R-value of R0.46 in most of New Zealand (New Plymouth sits in this range), up from R0.37 previously. That's still well below the R-values required for walls and roofs, which is why windows remain the weakest thermal point in most Taranaki homes even after insulation upgrades. Any glazing work should also meet NZS 4223, the relevant glazing standard covering glass selection and design (Part 1) and human-impact safety requirements for glass within 2000mm of floor level (Part 3) - worth asking any installer about directly.
There are two genuinely different approaches to double glazing, and it's worth understanding both before getting quotes. Full frame replacement swaps out old joinery entirely for new double-glazed aluminium or timber frames - more expensive, but appropriate where frames are damaged or being upgraded anyway. Retrofit (or secondary) glazing fits new double-glazed units into your existing frames, which is cheaper and less disruptive, and is the approach used by established systems like Metro's RetroFit Double Glazing and Thermawood. One thing to be clear on: unlike insulation and heat pumps, EECA's Warmer Kiwi Homes scheme does not fund double glazing or window replacement, so there's no government grant to offset the cost - get several like-for-like quotes and check WGANZ membership as a baseline credential.
Retrofit double glazing for a typical home (around 5-10 windows) generally starts from roughly $3,700-$4,000 in Taranaki, though exact pricing depends on window sizes, frame material and glass specification. Full frame replacement with new double-glazed aluminium or timber joinery costs considerably more per window than retrofit units. Get quotes from at least two or three local installers to compare, since pricing varies a lot by scope and glass type.
No. EECA's Warmer Kiwi Homes scheme funds ceiling and underfloor insulation and heat pumps, but it explicitly does not cover double glazing or window replacement. Unlike those other home-efficiency upgrades, homeowners pay the full cost of double glazing themselves, so it's worth comparing retrofit and full-replacement quotes carefully.
Full frame replacement removes your existing window and door joinery entirely and installs new double-glazed aluminium or timber frames. Retrofit (or secondary) glazing keeps your existing frames and fits a new double-glazed unit or a magnetic secondary panel into them, which is faster, less disruptive and generally cheaper. Retrofit is common in Taranaki's older timber-framed villas and bungalows where the original joinery is still sound.
Retrofit double glazing for an average home is typically completed within one to a few days, since the existing frames stay in place. Full frame replacement takes longer, especially for larger homes or projects involving multiple rooms, and may need to be staged around builder or joiner availability.
Yes, for most older single-glazed homes it makes a noticeable difference to warmth, condensation and street noise, since single glazing is well below the current Building Code minimum R-value for windows. Retrofit double glazing is usually the practical option for character villas and bungalows, as it improves performance without replacing the original timber joinery.
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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