.webp)
One of the most common questions we get from homeowners considering a replacement is how disruptive the process is. The straightforward answer is that most residential replacements are completed within one to three days, depending on the number of windows and doors being replaced and the complexity of the openings.
Our team handles removal and installation. The existing frames come out, the new joinery goes in, and the finishing around each opening, both inside and out, is completed before we move on. The home is habitable throughout the process, and rooms are typically only out of use for the duration of the work in that area.
When it comes to replacement joinery, homeowners broadly have two options. A like-for-like retrofit keeps the existing opening size and replaces the joinery within it. This is usually the most straightforward and least disruptive approach, and it works well when the existing openings are appropriately sized and positioned.
A full replacement, where the opening is modified as part of the process, makes sense when the existing windows are too small for the space, when a different door configuration would work better for the room, or when the goal is to significantly change the look of the home from the outside. This involves more work but gives more flexibility in what the result looks like.
A significant portion of Christchurch's housing stock was built during eras when single glazing was standard and aluminium frames were basic. Many of those homes still have their original joinery, functional enough to keep the weather out, but well below what modern glazing delivers in terms of thermal performance, noise reduction, and condensation control.
The gap between original single-glazed joinery and a properly specified modern replacement is substantial. Homes that have been retrofitted with double glazing and thermally broken frames consistently report noticeable improvements in how the home feels through winter, warmer rooms, less condensation, lower heating costs, often from the first season after installation.
Homes are assessed on presentation and condition, and joinery is one of the first things a buyer or valuer registers, both from the street and from inside. Original single-glazed windows, timber frames showing age, or aluminium frames with condensation staining and worn seals all signal deferred maintenance regardless of how well the rest of the home has been looked after.
New double-glazed joinery throughout a home changes that picture significantly. It reads as a substantial upgrade, it removes one of the most common items flagged in pre-purchase building reports, and it brings the thermal performance of the home in line with what buyers increasingly expect from a Canterbury property.
%20(1).webp)
We replace windows across the full Omega range, in both the 300 Series and the 800 Series thermally broken system. Both are available across all standard window styles (awning, casement, sliding, bi-fold, and fixed) and both are custom-measured to your existing openings.
The 300 Series is a well-proven system for residential homes and renovations. It handles Canterbury conditions reliably, is available with 24mm high-performance double glazing, and delivers a clean, modern finish at a price point that suits most residential replacement projects.
The 800 Series thermally broken system is suited to homes where thermal performance is the priority. The thermally broken frame significantly reduces heat transfer through the frame itself not just through the glass) which makes a meaningful difference in homes where energy efficiency and condensation control are the main concern. It's also the right specification for homes in higher wind zones and for architectural builds where the frame profile and finish need to meet a higher standard.
Both systems are double-glazed, both are finished in powder-coated aluminium across a wide colour range, and both are installed by our own team with a full quality check before sign-off.
We replace doors across the full Omega suite, in both the 300 and 800 Series systems. Available configurations include sliding, stacking, bi-fold, hinged, and French doors, all custom-made to your existing openings and all double-glazed.
The 300 Series covers the full door range at a specification that suits most residential replacement projects. Sliding and stacking doors in the 300 Series are engineered for Canterbury conditions, tested for wind and weather, with a seal compression system that manages drafts and moisture, and heavy-duty rollers rated to carry panels over 300 kilograms. The track system includes a sump to contain debris and prevent buildup under the panels, and the no-trip threshold allows internal and external floor levels to align flush.
The 800 Series thermally broken system adds advanced thermal break technology to the frame construction, which improves energy efficiency and indoor comfort significantly for homes where the door is a major part of the building envelope. The 800 Series external sliding door is tested to extra-high wind zone standards, making it the right specification for exposed Canterbury properties. Locking across both hinged and sliding configurations is multi-point, and the hardware throughout is stainless steel.Both systems are powder-coated in a wide range of colours and installed by our own team. Every replacement door installation includes a full quality check and operational walkthrough before we leave the site.
.webp)
Number One Windows and Doors works across residential replacements, full home re-joiseries, rental upgrades, and commercial joinery replacement throughout Christchurch and Canterbury. Whether you're replacing a handful of windows in an older home or fitting out an entire property with new joinery, our team manages the full process, including consultation, measurement, removal, installation, and sign-off.
We supply and install across the full Omega range in both the 300 and 800 Series. Every job is handled by our own team, fully measured on site, and completed to a standard we stand behind.
.avif)
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.
-min.webp)
.webp)
