Nelson's older timber-joinery housing stock and cool winter nights make double glazing one of the highest-impact upgrades a homeowner can make. Whether you need full-frame aluminium or uPVC joinery replaced, or a retrofit unit fitted into your existing timber frames, we've independently verified the installers below actually operate in Nelson and do genuine glazing work.
This page highlights the Top 5 double glazing installers in Nelson, based on independent research into reputation, accreditation, service quality and overall reliability.
The top 5 double glazing installers in Nelson are 1. Design Windows Nelson, 2. Insite, 3. Fast Glass Nelson, 4. Nic Ward Glazing, 5. Richmond Glass. 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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Design Windows started in Nelson over 40 years ago and is a confirmed WGANZ (Window & Glass Association NZ) member, holding multiple WGANZ National Award wins for residential joinery. Its Nelson branch holds a 5.0-star Google rating from 22 reviews and employs 27 local staff at its Stoke premises.
Insite is a confirmed WGANZ member operating from its own Stoke fabrication premises since 2006. It is an APL-certified fabricator and APG-certified glazier, holding a 5.0-star Google rating from 12 reviews, and manufactures both aluminium and uPVC double-glazed joinery on site.
Fast Glass Nelson Limited is a registered NZ company (NZBN 9429047276451, classified under glazing services) run by master glaziers Paul and Donna since 1998. It's a locally owned, family-run operation with nearly three decades of continuous trading in the greater Nelson area.
Nic Ward Glazing Limited is a registered NZ company (NZBN 9429041994238, glazing services) founded in Nelson in 2015 and specialises specifically in timber-frame retrofit double glazing, an important niche given Nelson's older wooden-joinery housing stock. Named customer testimonials, including from a local joinery business, corroborate its workmanship.
Richmond Glass is a real, physically-based glazing operator at 56 Gladstone Road, Richmond, with around 40 staff and a claimed combined 200+ years of team glazing experience. It is the authorised HomePlus franchisee for the Nelson region and offers both timber and aluminium retrofit double glazing.
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 |
|---|---|
| Design Windows Nelson | Full-frame aluminium or uPVC window and door replacement |
| Insite | Custom-fabricated aluminium and uPVC double glazing |
| Fast Glass Nelson | Retrofit double glazing from an established, long-trading local glazier |
| Nic Ward Glazing | Retrofitting double glazing into older timber window frames |
| Richmond Glass | Retrofit double glazing backed by a larger local team |
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 across most of New Zealand, including Nelson (climate zones 1-4). That's a big step up from the old R0.37 minimum, but windows are still by far the weakest thermal element in a typical Nelson home compared with insulated walls and roofs, which is exactly why glazing upgrades deliver such a noticeable difference in comfort and heating bills. Any installer working on new joinery should be building to current H1 requirements and installing to NZS 4223, the national glazing standard covering glass selection (Part 1) and human-impact safety glazing within 2000mm of floor level (Part 3). It's worth asking directly whether a business is a WGANZ (Window & Glass Association New Zealand) member, since membership is a reasonable proxy for an installer being plugged into current standards and industry practice, though it isn't a legal requirement to operate.
You'll also need to decide between full-frame replacement and retrofit (secondary) glazing. Full-frame replacement swaps out the entire window or door unit for new double-glazed aluminium or uPVC joinery, which is the most thorough option but also the most expensive and disruptive. Retrofit double glazing instead fits a new sealed double-glazed unit, or a magnetic secondary glazing panel, into your existing frames, which suits older timber joinery you want to preserve and is significantly cheaper. One thing to be clear on: unlike insulation or heat pumps, there is currently no EECA Warmer Kiwi Homes grant funding for double glazing, so it's a cost homeowners need to budget for directly. Get quotes from more than one installer, ask to see examples of similar jobs (especially if you have older timber frames), and confirm in writing whether the quote is for full-frame or retrofit work before comparing prices.
Costs vary widely depending on whether you choose full-frame replacement or retrofit into existing frames, the number and size of windows, and the frame material (timber, aluminium or uPVC). Retrofit double glazing is generally the more affordable option since it reuses your existing frames. Get a free, itemised quote from at least two local installers so you're comparing like-for-like scope.
No. EECA's Warmer Kiwi Homes scheme funds insulation and heat pumps for eligible homes, but it does not cover double glazing or window replacement. Any double glazing work in Nelson needs to be budgeted for as a direct homeowner cost, not assumed to be grant-funded.
Full-frame replacement removes your existing window or door and installs an entirely new double-glazed aluminium or uPVC unit. Retrofit (or secondary) double glazing instead fits a new sealed glazing unit, or a magnetic secondary panel, into your existing frame, which is cheaper and better suited to preserving older timber joinery common in many Nelson homes.
A retrofit job on a typical Nelson home can often be completed within a day or two once measurements and units are ready, while full-frame replacement across a whole house may take longer and typically requires a lead time for the new joinery to be manufactured before installation.
Yes, for most older single-glazed Nelson homes. Since windows are typically the weakest thermal element in the house (well below current Building Code minimums for new joinery under Clause H1), double glazing meaningfully improves warmth, reduces condensation and cuts noise, and retrofit systems in particular let you gain these benefits while keeping original timber frames intact.
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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