Bradnams double hung windows are one of the most practical and versatile aluminium window systems available for Darwin homes.

With independently adjustable top and bottom sashes, they give you precise control over airflow — directing cool air in from the bottom, pushing warm air out at the top, or opening both sashes together for maximum cross-ventilation during the Wet Season. As Darwin’s authorised Bradnams licensed fabricator, DABSCO custom-manufactures every double hung window to your exact specifications at our local Darwin factory, so you get a product built specifically for the Top End’s tropical climate, not a warehouse stock item from down south.

What are Bradnams ‘ double hung windows?

A double hung window — sometimes called a sash window — has two independently operable sashes that slide vertically within the frame. Unlike a sliding window that opens horizontally, or an awning window that projects outward, both sashes on a double hung stay within the plane of the wall. This non-projecting design makes them ideal for walkways, verandahs, narrow side passages, and any area where an outward-swinging or protruding window would be a hazard to pedestrians.
Bradnams manufactures double hung windows in two configurations: the Essential Double Hung, which uses a smooth-action engineered sash balance system, and the Signature Counter Balanced Double Hung, which uses a traditional counter-balance mechanism for a heavier, more architecturally refined feel. Both are manufactured from high-grade aluminium extrusions and can be fitted with a fixed bottom sash for added security — a practical choice for homes with young children or security-sensitive rooms.

Why Double Hung Windows Suit Darwin’s Climate

Darwin’s tropical climate — long, humid wet seasons, relentless dry season heat, and the ever-present risk of tropical cyclones — demands windows that do more than just look good. Bradnams’ double hung windows are built with this environment in mind.
The ability to open the top sash independently is particularly useful in Darwin’s climate. Warm air rises naturally, so cracking the top sash allows heat to escape while keeping the bottom sash closed for privacy or security. Combine this with integrated insect screening, and you have a practical solution for year-round ventilation without letting mosquitoes in — a genuine consideration in the Northern Territory.
Full perimeter joint sealing on Bradnams double hung windows also provides excellent weatherproofing performance, keeping wind-driven rain out during tropical storms while maintaining the structural integrity required under the NT Building Code and the relevant provisions of Australian Standard AS 2047 for windows and glazed assemblies.

Bradnams Double Hung Window Features

Every Bradnams double hung window manufactured at DABSCO’s Darwin factory includes:

• Non-projecting sash design — safe for walkways, verandahs, and pedestrian areas
• Engineered sash balance system — smooth, effortless operation with conveniently located tension-adjustment screws
• Full joint sealing — maximises weatherproofing against tropical rain and wind.
• Optional fixed bottom sash — for added safety and security in bedrooms, children’s rooms, or elevated windows
• Optional keyed die-cast zinc cam locks — upgrade security without compromising aesthetics
• Optional integrated insect screening — factory-fitted, not a retrofitted add-on
• Optional security screening — compatible with Crimsafe and 007 security screen systems
• Custom colour and finish options — including a range of powder coat colours suited to Darwin’s UV intensity
• Double glazing compatibility — available for energy-rated builds targeting NatHERS 7-star requirements

Glass Options for Darwin’s Double Hung Windows

Choosing the right glass for your double hung windows makes a significant difference to comfort and energy costs in Darwin’s climate. DABSCO offers several glazing options to suit different budgets and performance requirements:

For guidance on which glass best suits your Darwin home, see DABSCO’s full glass options guide or speak with our team directly.

Custom Manufacturing in Darwin — Not a Warehouse Product

One of the key advantages of buying Bradnams double hung windows through DABSCO is that every window is custom-made to order at our Darwin factory. This means your windows are sized precisely to your rough openings — no shimming, no packing, no compromises. It also means lead times are managed locally, and any issues are handled by a Darwin-based team, not a call centre interstate.
As a Bradnams licensed fabricator, DABSCO has a formal manufacturing and supply agreement with Bradnams Windows & Doors, ensuring consistent product quality, access to genuine Bradnams hardware and extrusions, and full product warranty support. This is important for Darwin homeowners, builders, and renovators who need a reliable supply for projects that can’t afford delays caused by freight disruptions from southern states.

Who Uses Bradnams Double Hung Windows in Darwin?

Double hung windows are a versatile choice that suits a wide range of Darwin residential projects:

• New home builds — where architects specify double hung windows for tropical passive design.
• Home renovations — replacing old louvre or sliding windows with a more contemporary sash system
• Granny flats and secondary dwellings — where non-projecting sashes are essential near walkways
• Apartments and multi-residential buildings — where individual unit ventilation control is important
• Heritage-style homes in inner Darwin suburbs — where a sash window suits the architectural character of older Queensland-style homes
• Builders and developers — who require made-to-order windows with consistent quality across multiple lots

Bradnams Double Hung Windows vs Other Window Types

Ordering Bradnams Double Hung Windows Through DABSCO

Getting a quote from DABSCO is straightforward. Our Darwin-based team will need your rough opening dimensions (width and height), preferred configuration (single or double operable sash), glass selection, colour preference, and any additional options such as insect screening or security locks.
All windows are made to order, so early engagement — particularly for new builds or large renovations — ensures your windows arrive on schedule. DABSCO also offers flexible payment options, including 6 months interest-free on qualifying purchases via Latitude Gem Visa, making larger window projects more manageable.
To discuss your project, contact DABSCO’s Darwin showroom or request a quote online. For design guidance, our team can advise on configurations that meet Darwin’s building code requirements, NatHERS energy rating targets, and cyclone wind load classifications applicable to your location.

FAQ Section

Q: Are Bradnams’ double hung windows suitable for Darwin’s tropical climate?

A: Yes. Bradnams’ double hung windows are well-suited to Darwin’s climate. They offer adjustable top and bottom sash ventilation — ideal for managing tropical heat and humidity — along with full joint sealing for weatherproofing in heavy rain events. Integrated insect screening is also available, which is essential in Darwin for year-round comfort.

Q: What is the difference between a double-hung window and a sash window?

A: They are the same thing. ‘Double hung window’ and ‘sash window’ both refer to a window with two independently sliding vertical panels (sashes). In Australia, the term ‘double hung’ is more commonly used, while ‘sash window’ is older and more common in heritage or British-influenced contexts.

Q: Can Bradnams double hung windows be fitted with security screens?

A: Yes. DABSCO can fit Bradnams double hung windows with integrated security screening, including Crimsafe and 007 security screen systems, which are fabricated and supplied by DABSCO from our Darwin facility.

Q: Are DABSCO’s Bradnams windows made to order?

A: Yes. Every Bradnams double hung window supplied by DABSCO is custom-manufactured to your specific dimensions at our Darwin factory. This ensures a precise fit for your openings and avoids the delays and freight risks associated with ordering from southern states.

Q: Do Bradnams’ double hung windows comply with Australian standards?

A: Bradnams windows are manufactured in accordance with AS 2047 (Windows in buildings — selection and installation) and AS/NZS 4420 (Windows — methods of test). Product specifications may also meet cyclone wind load classifications relevant to Darwin and the Northern Territory. Confirm specific compliance requirements with the DABSCO team for your project.

Q: Can double-hung windows be double-glazed?

A: Yes. Bradnams’ double hung windows are available with double glazing for projects targeting NatHERS 7-star energy ratings. Speak with the DABSCO team to confirm availability and sizing constraints for your specific project.

Q: What glass options are available for Bradnams double hung windows in Darwin?

A: DABSCO offers several glass options, including standard-toned glass (67% UV reduction, 30% heat gain reduction), Sunergy energy-efficient glass, double glazing, and standard clear annealed glass. Toned glass is the most popular choice for Darwin homes due to the significant reduction in heat gain and UV exposure.