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Building or renovating a home is expensive, but the decisions that cost most people the most aren’t always the ones that feel expensive at the time. They’re the ones that looked like savings.
Windows are a good example. They’re one of the biggest line items in a build, and one of the areas where budget cuts often come back as higher power bills, discomfort and repairs. This guide covers practical ways to save money on a window project without paying for it later, so you can make an informed decision before you purchase new windows.
The 20/20 House concept is built around a simple idea: spend smarter, not less. It applies 80/20 thinking to home design, getting most of the performance, comfort and efficiency for a fraction of what poor decisions would ultimately cost. For windows, that means knowing where money is wasted, where it’s worth spending, and how good design does much of the work before you reach product selection.
If you’re already thinking about specific window types as part of your planning, our guides to double glazed fixed windows and double glazed awning windows cover how each type performs and where each earns its cost — two of the most relevant window types for a budget-conscious build where every specification decision needs to justify itself.
Before you can save money sensibly, it helps to understand what you’re actually paying for.
Window costs are driven by a handful of factors: size, complexity, material, glazing specification, and installation. The first three are where most of the variation sits.
Custom sizes cost significantly more than standard ones — sometimes 30 to 50% more, occasionally higher. That’s not a markup for its own sake; custom profiles require different tooling, longer lead times, and more labour. Most manufacturers produce standard sizes at volume, and that efficiency flows through to price.
Complexity adds cost fast. A simple casement or awning window is relatively inexpensive to manufacture and install. An arched top, a bay configuration, louvre panels, or a large fixed panel with unusual proportions all require more work, more material, and often more structural consideration. Each of those is a legitimate design choice — just not a free one.
Material is the other major variable. Unplasticised polyvinyl chloride (uPVC), aluminium, and timber sit at different price points and carry different performance and maintenance profiles. The cheapest upfront isn’t always the cheapest over a decade. More on that shortly.
When you shop for windows, compare quotes from more than one company on the same features and specification, not just the headline price.
If you’re unsure how much difference glazing actually makes, it’s worth understanding the mechanics behind it rather than just relying on general claims. This explanation of how double glazing improves energy efficiency in homes breaks down where the performance gains come from and why it has such a consistent impact on comfort and running costs.
The 20/20 House isn’t about building cheaply. It’s about building efficiently — making design decisions that deliver disproportionate value for their cost, and avoiding decisions that deliver very little value for a lot of money.
Applied to windows, that breaks into two things: reducing cost where it doesn’t affect performance or liveability, and protecting cost where it does.
There’s a version of “saving money on windows” that results in a home that’s stuffy in summer, cold in winter, and lit like a car park. That’s not a saving — it’s a penalty you pay slowly, every day you live there. The 20/20 approach takes liveability seriously as a design constraint, not something to be optimised away.
The following design-stage decisions consistently deliver genuine savings without any meaningful impact on how the home performs or feels to live in.
This is the single most effective cost lever available at the design stage, and it costs nothing to apply if you do it early.
If your architect or draftsperson is working with standard window dimensions — those that align with manufacturer catalogues — you avoid custom fabrication entirely. This isn’t about limiting your design; it’s about designing with material reality in mind. Good designers do this routinely.
The savings are real. On a full house build, standardising window sizes where it doesn’t compromise the design can realistically save several thousand dollars, sometimes significantly more. That money can then go toward better glazing, better hardware, or simply stay in your pocket.
Not all window styles cost the same to manufacture. A fixed window is the cheapest — it’s a frame and glass, no hardware. Awning and casement windows add hinges, handles, and operating mechanisms. Double-hung windows are more complex again. Bay windows, corner glazing, and curved profiles are at the expensive end.
None of this means you can’t have variety or architectural interest, and there are more options than ever. It means you should decide deliberately where complex, expensive window types earn their functionality. The kitchen sink window that nobody opens — does it need to be an awning window, or could it be fixed? The hallway highlight window — does it need to operate at all?
These questions, asked at the design stage, are free. Asked after construction starts, they’re expensive.
“Fewer windows” is a common piece of cost-saving advice. It’s not wrong, but it’s blunt. The more useful framing is: are these windows doing useful work? A room with multiple windows on the same wall may get little extra from the second one.
A window on a south-facing wall in Melbourne’s climate typically delivers minimal solar benefit and reasonable heat loss. A window on the north-facing living area can deliver meaningful passive heating in winter and, with appropriate shading, stay comfortable in summer. Those aren’t equivalent — one is earning its cost, and one probably isn’t.
Reviewing your window schedule through that lens — what is each window actually doing? — often reveals a few that can be eliminated or reduced without any real impact on how the home feels to live in. That’s a genuine saving.
This is where the 20/20 philosophy really earns its name. Good orientation and placement decisions can reduce the total window area you need, reduce the glazing specification required, and reduce your long-term energy costs — all at once.
In Australian climates, north-facing living areas with correctly sized eave overhangs are the foundation of passive solar design. Winter sun sits lower and penetrates deep into north-facing rooms, warming them naturally, while the summer sun sits higher and is blocked by the eave. It’s not complicated, but it requires thinking at the design stage.
If your home is well oriented, you may need less supplementary heating and cooling, so your glazing specification doesn’t have to work as hard. A moderately specified double glazed window on a well-oriented north face often outperforms a highly specified window on a poorly oriented south face, and costs less to install.
Cross ventilation is another design tool that reduces the burden on windows to carry the full performance of a home. Placing windows on opposite sides of a room — or using a combination of high and low openings — creates natural airflow that reduces cooling loads in summer. Getting this right at the design stage is essentially free. Adding it later is either impossible or very expensive.
Frame material is one of the most significant variables in both upfront cost and long-term performance. The right choice depends on climate, budget, and how the home will be used.
uPVC windows sit at a mid-range price point and deliver strong thermal performance. The multi-chamber profile design means the frame itself contributes to insulation — a meaningful advantage in climates with cold winters or very hot summers. Maintenance requirements are minimal, and quality products have a long service life.
For most residential builds, uPVC represents the best value on cost-to-performance. The thermal performance advantage over standard aluminium is significant enough that cheaper glazing can sometimes be specified to reach the same overall window energy rating — an important consideration when budgeting.
Aluminium is durable, available in a wide range of powder coat colours, and handles large structural spans well. Standard (non-thermally broken) aluminium conducts heat and cold efficiently through the frame, which is a disadvantage in climates with temperature extremes. Thermally broken aluminium addresses this but adds cost, typically pushing the price above that of comparable uPVC.
For large openings, commercial applications, or homes where the architectural aesthetic prioritises slim sightlines, aluminium often makes more sense. For standard residential windows where thermal performance is a priority, the value case requires closer examination.
Timber frames carry a higher price tag and higher maintenance overhead than either uPVC or aluminium. For heritage homes, architecturally significant renovations, or homeowners who genuinely value the aesthetic, timber has a legitimate place. For cost-conscious builds where performance is the primary driver, it’s harder to justify.
If there’s one area of a window budget where upgrading pays dividends, it’s the glass.
Single pane windows, still common in many Australian homes, transfer heat almost freely. Double glazing — two panes with an insulating air or gas-filled gap — is dramatically better. When you replace old windows, the difference in thermal performance between single and double glazing is far more significant than most homeowners expect, and energy efficient windows show it on energy bills every month.
Low-emissivity (low-e) glass coatings take it a step further. A low-e coating allows visible light through while reflecting infrared heat — keeping solar heat out in summer and keeping warmth inside in winter. It also cuts some UV, which reduces fading of furniture and your reliance on blinds. It’s not a premium indulgence; in most Australian climate zones, it’s a straightforward efficiency investment.
Safety glass is another area not to cut. Tempered (toughened) or laminated glass is required by AS 1288 in doors, low-level panels and wet areas, so it belongs in the budget from the start.
The calculus here is worth spelling out. A cheaper frame with better glazing will almost always outperform an expensive frame with cheap glazing in terms of thermal performance. If the budget is tight, protect the glazing specification and find ways to save elsewhere.
Some cost-saving decisions look smart on paper and cause problems for years. The following areas are worth protecting:
A window that costs $200 less to buy but adds $150 a year to your power bills has paid for that saving in 16 months and is then costing you money indefinitely. That’s not a saving.
Lifecycle cost thinking isn’t complicated, but it requires slowing down slightly and asking: what will this decision cost me over ten years, not just today? Treat the windows as a system, not a list of separate purchases.
This applies to material choice (maintenance costs for uPVC vs aluminium), glazing specification (energy bills over the life of the home), and installation quality (cost of remediation if something fails). In most cases, the products that look expensive up front look much more reasonable when the full picture is considered.
How you pay matters too. If the budget won’t stretch to the whole house, split the window replacement into stages: replace the worst windows first and set a savings plan for the rest, so the cost fits your income and other expenses. If you’re financing, compare interest rates and fees on loans or payment plans; a lower rate can matter as much as the window price. APS offers payment plans through ZIP, which can make the switch easier to manage.
Australia’s eight climate zones have meaningfully different window requirements. A window specification that’s appropriate for a Melbourne home may be over-specified in Brisbane and under-specified in a cold highland region. Your Nationwide House Energy Rating Scheme (NatHERS) rating — the national energy efficiency measure for homes — will reflect those choices, and it increasingly matters for both compliance and resale value.
If your property is in a bushfire-prone area, window specification isn’t just a performance question — it’s a compliance one. Different Bushfire Attack Level (BAL) ratings require different window products, and not all products are rated equally. This needs to be confirmed with your supplier and cross-checked against your council requirements.
Coastal properties have their own considerations. Salt air corrosion is real and progressive. uPVC performs well in coastal conditions. Aluminium requires appropriate coatings and periodic attention. Timber in a coastal environment without diligent maintenance is an ongoing project.
A handful of recurring decisions consistently undermine what should be a smart, cost-conscious window specification. Here are the most common ones.
Eliminating too many windows to save money is perhaps the most common regret in cost-conscious builds. You can’t easily add a window after the fact. The cost of under-windowing — in terms of natural light, ventilation, and liveability — is paid every day.
Choosing the cheapest glazing across the entire window schedule is another one. Not all windows need to be high-spec, but the windows in your main living areas, bedrooms, and any south-facing aspect in cooler climates are worth protecting with high-quality glazing.
Leaving window decisions too late in the design process is also expensive. Once a wall is framed, your window size options are largely fixed. Decisions made on paper at the design stage are essentially free. Decisions made on-site are not.
The 20/20 approach is about telling a genuinely unnecessary cost from a saving that costs more than it saves. The tips above come down to a few rules: standardise sizes, simplify where complexity isn’t earning its cost, design for orientation and ventilation, protect the glazing, and don’t scrimp on installation.
Done well, that delivers a comfortable, energy-efficient, well-lit home for meaningfully less than a poorly considered approach, without the compromises “budget build” usually implies.
APS Double Glazing supplies and installs uPVC double glazed windows and doors across Melbourne, with payment plans available, and the team can help you get the best value from your window replacement.
It refers to an efficiency-first approach to home design — making decisions that deliver the most value for the cost, and avoiding spending where it doesn’t translate into performance or liveability. Applied to windows, it means being strategic rather than simply cheap.
Standardise your window sizes, simplify operating styles where possible, and review your window schedule for any that aren’t earning their cost through light, ventilation, or passive performance. Protect your glazing specification even when reducing costs elsewhere.
Yes. Custom sizes can cost 30 to 50% more than standard equivalents, sometimes more. Designing to standard dimensions from the start is the most cost-effective single decision you can make at the planning stage.
There’s no universal answer, but the useful question is whether each window is doing something — delivering light, ventilation, or passive solar benefits. Windows that serve a purpose are worth their cost. Windows that don’t are just expensive holes in walls.
For most residential applications, uPVC offers a strong balance of upfront cost, thermal performance, and low maintenance. Standard aluminium is cheaper upfront, but underperforms thermally without costly thermal break technology. Timber is generally the most expensive option with the highest maintenance requirements.
In most climate zones, yes. The thermal performance difference between single and double glazing is significant, and the energy savings over the life of the home typically justify the additional upfront cost, often comfortably.
North-facing windows in main living areas are the foundation of passive solar design in Australia. They deliver winter solar gain and, with appropriate eave shading, remain comfortable in summer. Pairing them with windows on the opposite side of the room supports cross ventilation and reduces cooling loads.
Eliminating too many windows, choosing poor glazing to save on upfront costs, leaving window decisions until the build is underway rather than at the design stage, and skimping on installation quality are the most common ones.
Significantly. Poorly specified windows — particularly those with inadequate glazing or thermally conductive frames — account for a meaningful share of a home’s heating and cooling load. Upgrading glazing specification is one of the most direct levers available to reduce ongoing energy costs.
Often, yes. A window that costs less upfront but leads to higher energy bills, requires earlier replacement, or needs more maintenance can easily cost more over ten to fifteen years than a better-specified product would. Lifecycle cost thinking is worth applying before finalising your window budget.