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Condensation forms when warm indoor air meets a cold surface. In homes with single glazing or older aluminium frames, that surface is the glass. In a Canterbury winter, it's cold enough to produce significant moisture buildup every day.
Over time, that moisture gets into window reveals, linings, and wall cavities. Mould follows. Modern double glazing with warm edge spacers and argon gas raises the temperature of the interior glass surface, which reduces the temperature differential and significantly cuts the amount of condensation produced.
Older window joinery, particularly original timber or early aluminium frames, was built to a different standard. The locking hardware is typically simple, the frames can be weakened by age and moisture, and the glazing is often single-paned and easy to break.
Modern aluminium windows are a meaningful step up. Our 800 Series awning and casement windows are engineered for structural strength, with multi-point locking options available and frames that are built to resist force rather than just hold glass in place.If your home still has its original windows, the security consideration alone is worth factoring into the decision.
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Every window we supply is made to measure for your specific openings. There's no standard sizing, no adapters to make things fit, and no compromises on how the frame sits in the wall.
This matters particularly for older Canterbury homes (villas, bungalows, and character houses) where openings are rarely consistent and standard off-the-shelf joinery either doesn't fit or looks wrong against the original lines of the house.
Powder-coated aluminium is available across a wide colour range. Our team will work through finish options with you during the consultation so the result suits the home both inside and out.
Canterbury's climate places specific demands on joinery. The temperature swings between seasons are wide, the nor'wester puts real load on frames and seals, and parts of the region carry high wind zone requirements that standard systems aren't rated for.
Every system we specify is chosen with Canterbury's actual conditions in mind, not just a general New Zealand standard that may have been written with a more moderate climate in mind. Both the 300 and 800 Series are built for long-term performance here, not adapted from systems designed elsewhere.
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Number One Windows and Doors works across both residential and commercial projects throughout Christchurch and Canterbury.
Whether you're a homeowner looking to add a conservatory to an existing property, a developer working on a multi-unit build, or a business wanting to extend or upgrade a commercial space, our team has the experience and the product range to get it done properly.
We supply and install the full Omega range, from the versatile 300 Series through to the architecturally specified 800 Series thermally broken system, alongside Metro Performance Glass for glazing that meets the demands of both residential comfort and commercial performance requirements.
Every project is managed by our team from the first consultation through to final inspection and sign-off.
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Number One at Windows
Whether you're after standard non-thermal options or thermally broken frames for superior insulation, we offer a full range of window styles — including awning, casement, sliding, bi-fold, and fixed windows — all double-glazed for maximum energy efficiency, noise reduction, and year-round comfort. Every window is custom-measured, precision-installed, and built to handle Canterbury’s diverse climate, with sleek modern finishes and low-maintenance durability.
Number One at Doors
From the reliable Omega 300 Series to the high-performance, thermally broken 800 Series, our doors are built for style, durability, and insulation. Choose from hinged, French, sliding, stacking, or bi-fold configurations — all double-glazed to enhance energy efficiency, reduce noise, and provide year-round comfort. Every door is custom-made to suit your space and lifestyle, with sleek profiles, smooth operation, and finishes that complement your home. Whether you're building new or upgrading tired joinery, we handle the full process — from consultation to installation.
Number One at Conservatories
Whether you're adding to an existing property or building new, a conservatory offers the perfect, temperature-controlled space between indoors and out — ideal for dining, relaxing, working, or simply soaking up the sun. Our conservatories are built with high-performance double glazing and modern aluminium joinery for year-round comfort, thermal efficiency, and lasting durability. More than just an extra room, a well-designed conservatory floods your home with natural light, boosts property value, and creates a warm, versatile space you’ll use every day. Custom-designed to suit your home and lifestyle, we manage the process from concept to completion — delivering light, space, and comfort.
Number One at Replacements
At Number One Windows and Doors, we’re your local window replacement specialists, trusted by homeowners across Christchurch and Canterbury. We remove outdated, inefficient joinery and replace it with high-performance, double-glazed aluminium windows built to suit your home and climate. Whether it’s a like-for-like retrofit or a full replacement using Omega’s 300 or 800 Series systems, we ensure a smooth process from consultation to install — with minimal disruption and maximum thermal comfort. Backed by trusted suppliers and expert workmanship, we make replacing your windows a smart, long-lasting investment in your home.
800 Series
We proudly supply and install the full Omega 800 Series – a premium, thermally broken aluminium joinery system designed for superior performance in Canterbury’s varied climate. Ideal for both residential and architectural builds, the 800 Series offers enhanced energy efficiency, strength, and design flexibility, making it perfect for modern homes that demand comfort and durability.
300 Series
we offer the trusted and versatile Omega 300 Series – a reliable aluminium joinery system ideal for residential homes and renovations throughout Christchurch and Canterbury. Designed as a non-thermally broken suite, the 300 Series delivers excellent durability, clean modern lines, and seamless functionality at an affordable price point.
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