DABSCO has been fabricating and installing Bradnam’s awning and casement windows from its Winnellie factory since 1966. Every window is manufactured locally to the specifications of each job, whether that is a single-storey Palmerston home, a multi-unit development in Darwin City, a remote community building in Maningrida, or a commercial project in Katherine. If you are researching awning or casement windows for a Top End build or renovation, this page covers what you need to know before requesting a quote.

What Are Awning and Casement Windows, and Why Do They Suit Darwin?

An awning window is hinged at the top of the frame and swings outward at the bottom when opened via a chain winder. A casement window is hinged at the side of the frame and swings outward in the same way a door does, often with a lever stay or winder to hold the sash at a set position. Both types form a tight seal against the frame when closed, which is a critical performance characteristic in Darwin’s climate.

In the build-up and wet season, Darwin experiences sustained rainfall, high humidity, and storm events that can push water horizontally against window frames at significant pressure. The angled sash of an awning window sheds rain outward while the window remains open, maintaining ventilation without water ingress during tropical downpours. This is a behaviour that sliding and louvre windows cannot replicate under the same conditions. For bedrooms and living areas where you want airflow through November to March without closing up every time a storm cell passes over, awning windows are one of the most practical choices available in a tropical build.

The casement configuration delivers a wider clear opening than an awning of the same nominal size, which improves cross-ventilation when windows on opposite sides of a room are opened simultaneously. Traditional elevated Darwin homes were designed with exactly this principle in mind: prevailing southerly breezes in the dry season and easterly sea breezes in the build-up require openings that capture and direct airflow rather than partially blocking it. In NatHERS assessments for Climate Zone 1 (tropical), increasing openable window area improves the star rating by reducing reliance on mechanical cooling. Bradnam’s awning and casement windows open to a position that delivers maximum openable area relative to their frame size, which supports that performance outcome.

Wind Region C Compliance and Structural Performance

Darwin sits within Wind Region C as defined by AS/NZS 1170.2, the Australian standard for structural design actions on buildings. Region C is a cyclonic zone covering a 50-kilometre coastal strip along the Northern Territory, northern Queensland, and the northern half of Western Australia. Every window and door installed in a new or substantially renovated Darwin building must meet the structural requirements that apply to its specific wind classification — C1, C2, or C3 — based on the building’s location, height, and terrain category.

Bradnam’s awning and casement windows are engineered and tested to meet Wind Region C structural performance requirements. The full joint sealing system at all four corners of the frame maximises resistance to water ingress under sustained wind-driven rain, which is one of the failure modes that cyclone events expose in substandard framing. The optional sash winder mechanism locks the sash in the open position and prevents it from slamming closed or blowing open under gusting wind loads during the early and late stages of a cyclone event.

All Bradnam’s products fabricated at DABSCO’s Winnellie factory are manufactured under the Bradnam’s licensee quality system, which carries AWA (Australian Window Association) accreditation. Performance testing is conducted to the requirements of AS 2047, the Australian standard for windows and external glazed doors in buildings. AS 2047 covers air infiltration, water penetration, operating force, structural performance, and rattle resistance. When your building certifier in Darwin, Palmerston, or Katherine asks for evidence of window compliance, the AS 2047 test documentation for Bradnam’s products is available from DABSCO’s Winnellie office.

For projects with a BAL (Bushfire Attack Level) rating, note that specific glass and framing specifications apply. Contact DABSCO directly to confirm the correct configuration for your site’s BAL rating before proceeding.

Energy Performance in the Tropics — WERS Ratings, NCC Section J, and NatHERS

Bradnam’s windows and doors are independently rated through WERS, the Window Energy Rating Scheme, which is administered by the Australian Fenestration Ratings Council (AFRC). WERS rates the complete window assembly — glass, frame, seals, and spacers together — rather than the glass alone. The two values most relevant to Darwin builders and certifiers are the U-value (Uw) and the Solar Heat Gain Coefficient (SHGCw).

In Climate Zone 1, which covers Darwin and the tropical Top End, the priority is solar control rather than thermal insulation. The SHGC value measures how much solar radiation passes through the glazing into the building. A lower SHGC reduces the amount of heat entering through the window, which directly reduces the cooling load on the air-conditioning system and supports a higher NatHERS star rating. Glass selection — whether clear, tinted, Low-E, or laminated — is the primary lever for managing SHGC in aluminium-framed windows.

Under NCC Section J, commercial buildings must demonstrate compliance with the prescribed glazing provisions or use an alternative verification method. For residential buildings under NCC Volume Two, the 7-star NatHERS minimum introduced in NCC 2022 applies. A NatHERS assessor modelling a Darwin home will account for window orientation, glass type, shading, and openable area. Bradnam’s WERS certificates provide the SHGCw and Uw data that NatHERS software requires as inputs. DABSCO can supply WERS certificate data for each window configuration to assist your assessor.

Research from the Northern Territory confirms that wider eaves and increased openable window area produce the greatest performance improvements for Darwin homes in NatHERS assessments. Awning and casement windows, with their full clear opening capability, contribute directly to this outcome.

Configurations, Sizes, and Glass Options

Bradnam’s awning and casement windows are available across three collections: the Essential Collection for standard residential applications, the Signature Collection for premium residential and light commercial work, and the Commercial Collection for larger openings and high-specification projects. DABSCO fabricates all three at the Winnellie factory.

Standard awning windows come with a chain winder as the default operating mechanism. The chain winder controls the degree of opening and holds the sash securely at the set position. Oversized configurations in the Signature range extend the available height and width beyond standard sizing to suit architectural designs with larger window openings. All casement configurations include a stay mechanism to secure the sash in the open position.

Glass selection has a direct impact on both energy performance and acoustic performance. Standard clear glass transmits the highest proportion of solar radiation and is the base case for WERS ratings. Tinted glass in grey, bronze, or green reduces solar transmission and glare. Low-E (low-emissivity) glass has a microscopically thin metallic coating that reflects infrared radiation, reducing SHGC and improving Uw simultaneously. Laminated glass provides acoustic attenuation and safety glass properties, and is required in certain locations under the NCC (within 1200 mm of a floor level, for example). DABSCO can advise on the glass specification that suits your site’s orientation, NatHERS assessment requirements, and budget.

Contact DABSCO at (08) 8947 8111 for exact size ranges, configurations, and project-specific sizing.

Frame Colours, Powder Coat Finishes, and Screening Options

Bradnam’s aluminium frames are powder-coated to a Qualitcoat-certified standard. Qualitcoat is the internationally recognised quality label for liquid and powder coatings on aluminium. In Darwin’s climate — high UV intensity for twelve months of the year, salt-laden coastal air in many suburbs, and sustained heat through the build-up — the quality of the powder coat finish directly affects the service life of the frame. A Qualitcoat-certified finish provides measurably better resistance to UV fading, chalking, and corrosion than uncertified alternatives.

Standard colours include white, Surfmist, Paperbark, Woodland Grey, and Basalt. Monument and Shale Grey are available as premium options. Anodised finishes in clear anodised and champagne anodised are also available for architectural applications where a metallic appearance is specified. DABSCO can confirm the full current colour range from Winnellie, as colour availability may vary by configuration.

Integrated insect screening and Crimsafe security screening are both available as factory-fitted options on awning and casement windows. In Darwin, Palmerston, and Humpty Doo, the combination of security screening and insect screening on an awning window allows the window to remain fully open at night — ventilating the house — while providing both insect exclusion and a security barrier. Crimsafe’s stainless steel tensioned mesh system is tested and certified to resist forced entry and cyclone debris. The Crimsafe Safe-S-Cape is a hinged security screen option that fits awning and casement windows and swings open for easy egress.

Local Manufacturing and Supply Across the NT, Kimberleys, and Remote Communities

DABSCO has operated from the Winnellie industrial precinct in Darwin since 1966 — nearly sixty years of continuous local manufacturing, supply, and installation. Every Bradnam’s window and door sold through DABSCO is fabricated at the Swan Crescent factory to the customer’s specific dimensions and configuration. There is no interstate freight delay for standard orders. When a builder in Palmerston, a homeowner in Humpty Doo, or a project manager at a development in Batchelor needs a variation or a replacement sash, DABSCO’s factory team can respond with local knowledge and local stock.

DABSCO supplies and installs Bradnam’s awning and casement windows across the full service region listed below. For remote community projects in Maningrida, Groote Eylandt, Bathurst Island, and Gove, DABSCO has extensive experience with the logistics, lead time planning, and freight coordination that remote NT delivery requires. International supply is available, with previous projects completed in East Timor.

Finance Options

DABSCO offers two finance pathways for window and door purchases. These cannot be combined with any other offer or discount.

Frequently Asked Questions

Can I leave awning windows open during wet season storms in Darwin?

Yes. The angled sash of an awning window deflects rain outward when the window is partially open. This is one of the main reasons awning windows are popular in tropical climates — they allow ventilation during light to moderate rain without water entering the room.

What is the difference between an awning window and a casement window?

An awning window is hinged at the top and opens outward at the bottom. A casement window is hinged at the side, like a door. Awning windows are better for wet-season rain protection. Casement windows provide a wider clear opening for cross-ventilation when fully open.

Are Bradnam’s awning windows rated for Wind Region C in Darwin?

Yes. Bradnam’s awning and casement windows are tested and manufactured to meet Wind Region C structural requirements under AS/NZS 1170.2. DABSCO can provide AS 2047 test documentation to assist your building certifier.

What glass should I choose for north or west-facing windows in Darwin?

Low-E glass or tinted glass on north and west-facing windows reduces solar heat gain, which lowers your cooling load. WERS-rated glass combinations provide the SHGCw data your NatHERS assessor needs for Climate Zone 1 compliance.

Can security screening be fitted to awning and casement windows?

Yes. Crimsafe hinged Safe-S-Cape screens and integrated insect screens are both available for awning and casement windows. Crimsafe provides security and cyclone debris protection while allowing the window to remain open for ventilation.

How long does it take to get windows manufactured and delivered by DABSCO in Darwin?

DABSCO manufactures Bradnam’s windows locally at Winnellie. Standard residential lead times vary by order size and current factory load. Contact the team on (08) 8947 8111 for a current production estimate.

Does DABSCO supply awning windows to Palmerston, Humpty Doo, and Katherine?

Yes. DABSCO supplies and installs Bradnam’s windows across Darwin, Palmerston, Humpty Doo, Batchelor, Katherine, Alice Springs, Kununurra, Broome, Gove, and remote NT and WA communities.

What are the financing options for purchasing awning windows from DABSCO?

Latitude Gem Visa offers 6 months interest-free on purchases from $250, and 18 months interest-free on purchases from $1,500. HUMM offers buy-now-pay-later with no interest ever. Finance cannot be combined with other offers.