A fixed lite window is a sealed, non-opening aluminium window frame with a glass panel. It does not slide, swing, or tilt. Its job is to admit light, frame a view, or fill an architectural opening where ventilation comes from somewhere else.

In Darwin, fixed lites are used in specific applications where specifying an operable window would be wasteful or structurally unnecessary. They are commonly paired with sliding windows, awning windows, louvre windows, or stacking doors to provide a combination of fixed glass area and controlled ventilation in the same wall section. When the ventilation path is already handled, a fixed light is often the right product.

DABSCO has been manufacturing Bradnam’s aluminium windows and doors in Darwin since 1966. Fixed lites are fabricated at our Winnellie factory at 19 Swan Crescent, to the dimensions and glass specifications each job requires. Nothing is shipped in from interstate and adjusted. Everything is built here for Northern Territory and remote WA conditions.

Where Fixed Lite Windows Are Used in Darwin Builds

The most common application for fixed lites in Darwin residential builds is as a sidelight beside a front entry door or as a highlight window above door height where cross-ventilation is not the design objective. They are also used to fill raked ceiling lines where an operable sash would be geometrically impractical, in stairwells to borrow light between spaces, and in bathrooms where privacy glass provides light without requiring openings.

In commercial builds across Darwin, Palmerston, and Katherine, fixed lites are regularly used as shopfront panels, office partitioning with glazed upper sections, and as large-format architectural glazing where the view is the point of the opening.

Fixed lites also appear frequently in tropical passive design, where the brief calls for a specific glass to control solar heat gain in one area of the building while allowing full ventilation in adjacent openings. Getting the glass right in a fixed lite matters more than in an operable window, because you cannot simply open it when conditions change. See our glass options and product information for a full breakdown of what is available.

Frame Options: 52mm and 125mm Aluminium Profiles

Bradnam’s fixed lites are available in two frame depth options.

The 52mm frame suits the majority of Darwin residential jobs. It installs cleanly into standard brick or cavity construction and takes the standard glass range without issue.

The 125mm frame is used when wall construction is thicker, when a deeper rebate is needed for laminated or double-glazed units, or when the architectural specification calls for a wider sight line. It is also used in some commercial applications where the framing needs to carry a larger glass panel or where a more substantial visual weight is appropriate.

Frame finish options include powder coating in a full range of standard and custom colours, and anodising. In Darwin’s coastal and salt-air environment, a quality powder coat over properly pre-treated aluminium extrusion is important for longevity. Bradnam’s extrusions used by DABSCO are treated and coated to perform in tropical and coastal conditions.

Glass Selection for Darwin’s Climate

The glass you put into a fixed lite has a direct effect on the thermal performance of your building. Because a fixed light cannot be opened, you have no ability to manage solar heat gain through ventilation. The glass does all the work.

Darwin sits in a high UV, high solar radiation environment. Build-up season temperatures combined with high humidity mean that unmanaged solar heat gain through fixed glass panels will drive up cooling loads significantly.

Dark Grey Solarblock is DABSCO’s standard-toned glass. It provides approximately 30% reduction in heat gain, 50% reduction in glare, and around 67% reduction in UV transmission. For most Darwin residential fixed lights, this is the starting point.

Sunergy Low-E Glass goes further. It combines a neutral tint with a hard Low-E coating that adds an insulating layer to the glass, reducing heat transfer in both directions. Sunergy delivers 72% UV reduction and allows higher visible light transmission compared to conventional tinted glass of similar solar performance. For west-facing or north-west-facing fixed lites in Darwin, Sunergy is worth specifying.

Clear Annealed Glass is available, but is rarely the right call for Darwin fixed lites unless the opening is fully shaded by a deep overhang or external louvre system that eliminates direct sun exposure entirely.

WERS (Window Energy Rating Scheme) ratings are available for Bradnam’s window systems. If your project requires NatHERS modelling or compliance with NCC Section J energy provisions, glass selection for fixed lites needs to be considered at the specification stage, not as an afterthought. Speak to DABSCO early in the design process if energy compliance is a project requirement.

Shape Flexibility: Rakes, Arches, and Circles

One of the practical advantages of a fixed lite over an operable window is that it can be fabricated in non-rectangular shapes. Because there are no moving sashes, hinges, or sealing mechanisms to accommodate, the frame geometry can follow the architectural line.

DABSCO fabricates Bradnam’s fixed lites in the following shapes:

• Raked frames — to follow sloped ceiling or roofline profiles
• Arched heads — full arch or segmental arch options to match period or architectural detailing
• Circular and oval — porthole and feature windows for residential and commercial applications
• Custom geometry — irregular shapes to meet specific architectural drawings

In Darwin, raked windows are common in elevated homes with skillion or sloped rooflines. Arched fixed lites appear in both residential entries and commercial facades. Circles and ovals are used in feature walls, en-suites, and stairwells. All of these are fabricated at the DABSCO factory in Winnellie, not outsourced or approximated with a standard frame. You can see examples of installed fixed lite windows and related products in our project gallery.

Wind Region C and Cyclone Compliance

Darwin and the Northern Territory sit in Wind Region C under AS/NZS 1170.2, the second-highest wind loading classification in Australia. It applies to the entire Darwin urban area, Palmerston, and the majority of NT communities. Fixed lite windows installed in Wind Region C must be engineered to resist the design wind pressures that apply to the specific building location and exposure category.

Bradnam’s fixed lite window systems are engineered and tested for Australian wind loading requirements. AS 2047 sets the compliance framework for window and door products in residential construction in Australia, covering structural performance, weatherproofing, and operating force requirements.
When DABSCO fabricates a fixed lite for a Darwin job, the product is built to the specification required for Wind Region C. This is not optional, and it is not a premium add-on. It is the baseline for any window installed in this territory.

For projects in coastal Darwin, Darwin Harbour frontages, or exposed elevated sites, additional wind load calculations may be required by the structural engineer or certifier. If you are building on a site with an unusual exposure classification, raise this with DABSCO at the quote stage so the correct product specification is applied from the start.

Manufactured in Darwin at Winnellie

DABSCO is a licensed Bradnam’s fabricator. We manufacture Bradnam’s products at our factory at 19 Swan Crescent, Winnellie, NT 0820. Every fixed lite window that leaves this factory is built to the measurements, glass specification, and frame colour specified for that job.

Manufacturing locally means lead times are controlled by our own production schedule, not by a freight run from Queensland or Victoria. It also means when something needs to be adjusted or a replacement is required, it is made here and delivered here.

We have been doing this in Darwin since 1966. That means we have installed fixed lights into properties across Darwin, Palmerston, Humpty Doo, Katherine, Alice Springs, Kununurra, Broome, Derby, Gove, Groote Eylandt, and remote NT and WA communities. We know what works in this climate and what does not. Browse our full range of Bradnam’s windows and doors to see what else we manufacture locally.

Finance Options

Fixed lite windows can be financed through DABSCO’s two available finance partners.

Latitude Gem Visa — 6 months interest-free on purchases over $250. 18 months interest-free on purchases over $1,500. No early payout penalties.

Humm — Buy now, pay later. No interest ever. Repaid in fortnightly instalments.

Finance cannot be combined with other offers or discounts. Contact our Darwin office on (08) 8947 8111 for current availability and promotions.

Frequently Asked Questions

What is a fixed lite window?
A fixed lite window is a non-opening aluminium-framed window with a sealed glass panel. It does not open or operate. It is used where natural light or a view is required, but ventilation is not the purpose of that opening.

When should I use a fixed lite instead of an operable window in Darwin?
Fixed lites are appropriate when the ventilation requirement for that wall section is already met by another opening nearby, when the architectural shape does not suit an operable sash, or when the primary purpose of the opening is light or view rather than airflow. In Darwin, they are commonly used in sidelights, highlight windows above doors, raked ceiling sections, and as large-format glazing panels paired with stacking doors or sliding windows.

Are fixed lite windows rated for Wind Region C in Darwin?
Yes. Bradnam’s fixed lite windows manufactured by DABSCO are built to meet Wind Region C requirements under AS/NZS 1170.2. AS 2047 sets the structural and weatherproofing performance standard for residential window products in Australia.

What frame depth options are available?
Bradnam’s fixed lites are available in 52mm and 125mm frame depths. The 52mm frame suits most Darwin residential applications. The 125mm frame is used in commercial construction, thicker wall profiles, or where a deeper glazing rebate is required.

Can fixed lite windows be made in non-rectangular shapes?
Yes. DABSCO fabricates Bradnam’s fixed lites in raked, arched, circular, and custom geometric profiles. This is useful for architectural highlights, feature windows, and openings that follow a roofline or façade profile.

What glass should I use in a fixed lite window in Darwin?
For most Darwin residential fixed lites, Dark Grey Solarblock or Sunergy Low-E glass is the appropriate starting point. Clear glass is rarely suitable without a substantial external shading device because Darwin receives very high solar radiation year-round. The right glass selection depends on the orientation of the opening, shading from eaves or external structures, and any NatHERS or NCC energy compliance requirements on the project. See our glass options information page for more details.

Does DABSCO manufacture fixed lite windows in Darwin?
Yes. DABSCO is a licensed Bradnam’s fabricator manufacturing at 19 Swan Crescent, Winnellie, NT 0820. Every window is made to order for the specific job. DABSCO has manufactured and installed windows and doors across the Northern Territory since 1966.

How do I get a quote for fixed lite windows in Darwin?
Call DABSCO on (08) 8947 8111 or send an enquiry through our contact page to book a free measure and quote. We service Darwin, Palmerston, Humpty Doo, Katherine, Alice Springs, and remote NT and WA communities.