How much does a sunroom cost in Australia?

You've got a patio that gets great afternoon light, but half the year it's too cold, too hot, or too buggy to actually use. A sunroom fixes that. It gives you the feel of being outdoors without the weather working against you. But how much does this set you back?

Sunroom extension costs in Australia range from around $15,000 for a straightforward enclosed alfresco to $60,000 or more for a fully climate-controlled four-season room with premium glazing. The sunroom cost you land on depends mainly on the type of room, the materials, and whether you're building from scratch or enclosing an existing patio or veranda. Let’s look closer at the primary cost factors involved in building one.

What is a sunroom?

Bright sunroom with large windows (Source: iStock)

A sunroom is an enclosed home extension usually built with aluminium framing and glass or glazed panel walls designed to be usable in any weather. It creates a bright, weatherproof living space between your home and garden. In Australia, they're also commonly called glass rooms, patio enclosures, or enclosed alfrescos.

The majority of the structure is typically glass, which gives it plenty of natural light and connects it to the outdoors. The temperature in the space can also be controlled to suit the season, so you get the feeling of being outside without battling the elements.

Average sunroom installation cost by city

The average sunroom installation cost is between $1,500 and $3,500 per square metre, including electrical and lighting. The materials used and the type of glass installed will affect the price, so it's worth getting separate quotes for double-glazed and low-E glass options. 

The figures above reflect total installed costs, materials and labour combined, for a mid-range sunroom of around 20–25 sqm. Labour alone typically accounts for 40–60% of the total project cost. Still, prices vary depending on the complexity of your build, how much site preparation is involved, and local market conditions, so treat these as a starting point rather than a fixed budget. 

Sydney runs at the higher end due to above-average labour rates and more complex council requirements, particularly in inner-city areas. Brisbane and Adelaide sit in the middle of the range, while Canberra and regional areas tend to come in lower.

What factors affect the cost of a sunroom?

Cosy sunroom interior (Source: iStock)

Sunroom costs vary a lot depending on what you're building and how you're building it. These are the main factors that'll shape your final quote.

Type of sunroom

The type of sunroom you choose is the single biggest factor in what you'll pay. Here's a quick look at the typical basic enclosed alfresco costs or a premium four-season build.

Conservatory

Conservatories have glass walls and a glass roof, similar to a solarium but often with more architectural detail, like Victorian or heritage-style designs. They start from around $30,000 for a basic build and can go significantly higher for bespoke designs. The additional glazing and design complexity contribute to a higher price point, but they can make a striking statement and add considerable character to the property.

Four Season Room

Four season rooms are fully insulated, glazed, and connected to a heating and cooling system. Essentially, a proper interior room with more glass. 

They can be used comfortably every day of the year, which makes them the most popular choice for homeowners who want a genuine living space rather than a fair-weather addition. This typically ranges from $22,000 to $75,000, depending on size and finish.

Three Season Room

Three season rooms are enclosed with glass or screened panels but have no heating or cooling. They're designed for use in mild to warm weather, which in most parts of Australia means spring, summer, and autumn. 

Because there's no climate control to install, they're the most affordable sunroom type. These basic enclosed patio costs from $13,000 to $35,000 installed.

Glass Solarium

A solarium has glass from floor to ceiling, including the roof. The all-glass construction creates a dramatic connection to the outdoors but requires a robust steel frame to support the weight of the glazing. Glass solarium costs range from $25,000 to $80,000, and the build usually takes two to four weeks from start to finish.

Materials used

Roofing and glazing choices make a significant difference to the total cost. Insulated panel roofs cost more than polycarbonate but perform far better in extreme heat or cold. Double-glazed or low-E glass costs more upfront than standard single-pane but reduces heating and cooling bills over time. 

Sliding glass doors are generally more affordable than French doors. Those who select asphalt shingles for a roof will end up spending less than on a sunroom with a glass rooftop.

Size of the sunroom

Glass-enclosed sunroom addition (Source: iStock)

Larger rooms need more materials and more labour hours. Most builders price by the square metre, so the size of the footprint is a direct multiplier on cost. 

It's worth being realistic about how much space you'll actually use. A well-designed 20 sqm sunroom often outperforms a sprawling 40 sqm room that's hard to heat or cool.

Site preparation

Before laying the foundation, the site for the sunroom requires proper preparation. This process involves clearing away trees, levelling the ground, and pouring a concrete slab. If you're building on an existing slab, prep costs are minimal. If not, budget an additional $3,000 to $8,000, depending on size and ground conditions. More if the site requires significant earthworks or retaining walls.

Sunroom kit

A sunroom kit is a prefabricated enclosure that comes as a flat-pack system and is assembled on-site, usually attaching to an existing patio slab. They're a good option if your existing patio is a standard rectangular shape and your priority is functionality over aesthetics. The trade-off is limited customisation. 

Kits come in standard sizes and configurations, and the finish rarely integrates as seamlessly with your home as a custom build. Sunroom kit prices start from around $6,000 to $15,000 for the unit itself, making them the most budget-friendly way to enclose an outdoor area. Some kits are marketed as DIY-friendly, but most councils still require a permit and inspection regardless.

Custom sunroom

A custom sunroom is designed and built specifically for your home. It matches your roofline, materials, and layout rather than working around a standard kit size. 

This is the most popular choice for homeowners who want the room to feel like a genuine part of the house rather than an obvious add-on. Custom builds typically start from around $15,000 for a basic enclosure and can exceed $80,000 for a fully glazed four-season room with premium finishes.

Benefits of building a sunroom

Custom-built home sunroom (Source: iStock)

Adding a sunroom to your home is one of the more practical ways to gain extra living space without the cost and complexity of a full house extension. Here's why so many Australian homeowners make the investment.

Additional interior space

A sunroom adds genuinely livable square footage to your home without the disruption of a full house renovation or garage conversion. Whether you use it as a dining room, kids' playroom, home office, or a reading nook, it's a flexible space that tends to get used daily. And for growing families or multi-generational households, that extra room makes a real difference.

Enjoy the sun without going outside

The whole point of a sunroom is that you can sit in natural light and look out at the garden without battling the heat, cold, or insects. In Australia's climate, that's genuinely useful for most of the year, not just for a fortnight in spring.

Potential greenroom

The abundance of natural light makes a sunroom a great spot for plants. Tropical and indoor plants thrive in a bright, sheltered environment, and a sunroom gives you a space to keep them growing year-round without the risk of frost or scorching afternoon sun.

Property value

A well-built sunroom adds to your property's liveability and appeal. Integrated glass rooms and enclosed patios are increasingly popular with buyers, particularly when they're well-finished and feel like a natural extension of the home rather than a bolt-on addition. Add to that a front door refresh, and you’ll amp up your kerb appeal.

Do I need a permit to build a sunroom?

In most cases, yes. A sunroom attached to your home is generally treated as a home extension and requires either a Development Application (DA) through your local council or a Complying Development Certificate (CDC) via a private certifier. The specific rules vary by state and council, but generally, if it has a roof and attaches to the house, it needs approval.

It's also worth checking whether your property is in a bushfire zone, heritage overlay, or flood-affected area. All of which can add extra requirements and approval time. A reputable building surveyor can advise on what applies to your specific property, and many sunroom builders will handle the approvals process for you as part of the contract. 

Tips when hiring a sunroom builder

Professional sunroom builder at work (Source: iStock)

Finding the right sunroom builder makes a bigger difference than most people expect. Here's what to look for before you sign anything.

Get accurate quotes

Before reaching out to builders, take some time to determine the size of the area you want to enclose and make note of any additional work that might be needed, like a new slab or electrical upgrades. Once you've got a clear picture, get quotes from at least three builders. Prices vary more than you'd expect, and comparing them gives you a realistic sense of what's standard.

Check their licence and qualifications

Ask for your builder’s licence number and verify it with your state's building authority. For example, in NSW that's NSW Fair Trading. In Victoria, it's the VBA, and other states have equivalent registers. 

Ask for at least three references from recent clients so you can get an honest account of their experience, and check online reviews to get a sense of the builder's reputation. It's also worth checking their experience with sunroom projects specifically. This type of work is different from general residential construction, and experience here genuinely matters.

Save money on your sunroom build

The two most effective ways to cut costs are to build smaller and to choose a three-season room. A smaller sunroom uses fewer materials, takes less time to build, and is cheaper to run. And for most households, a well-designed 15–20 sqm space is plenty. 

Opting out of heating and air conditioning can also save thousands on both the build and the ongoing running costs. Choosing lower-cost materials for the roof and glazing will bring the price down further without compromising the basic function of the space.

Let the sunshine in 

A sunroom is one of those additions that tends to exceed expectations. Suddenly, you've got a room the whole family uses every day, and the rest of the house feels more connected to the garden. The key is finding the right people for the job.

On Airtasker, you can connect with experienced local patio contractors and building and construction professionals who specialise in sunrooms, enclosures, and outdoor living spaces. Post a task today and connect with qualified builders who'll help you turn that underused patio into a year-round living space.