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When most people picture a three storey home, they think of a grand city terrace or a hillside estate somewhere far removed from everyday suburban life. That image is shifting. Across Mandurah, the Peel region, and Perth’s southern suburbs, three storey homes are appearing on standard residential lots, and the families building them are not doing so for show. They are doing it because the maths works, the views are worth it, and the land simply does not allow any other answer.
This guide walks through why three storey homes are gaining traction in WA, what they genuinely offer compared to single and double storey alternatives, what you need to know before designing one, and how to approach the planning process with confidence.
The Land Problem That Three Storeys Solves
Perth and its surrounding regions have a residential land reality that shapes nearly every building decision: lots are narrowing, coastal blocks come at a premium, and sloping terrain adds complexity that conventional two-storey designs struggle to handle gracefully.
In coastal areas like Dawesville, Halls Head, and Wannanup, a waterfront or near-water block might be modest in footprint but extraordinary in position. Building upward rather than outward lets you keep your outdoor entertaining space, preserve the garden, and still achieve the floor area a growing family genuinely needs.
On sloping blocks, a third storey is sometimes the most structurally sensible response rather than a luxury choice. Where a double-storey design might require extensive cut-and-fill earthworks to create a level building pad, a three-level design can step naturally with the land, reducing civil costs and often producing more interesting architecture in the process.
Canal blocks throughout Mandurah and the broader Peel region present their own version of this challenge. The blocks are typically long and narrow, with the water frontage at one end and the street access at the other. Adding a third level at the rear solves the privacy, outlook, and floor area problem without sacrificing the backyard connection to the water that made the block worth buying in the first place.
What Three Storeys Actually Gives You
The practical gains from a three-level design go further than simply more bedrooms. The way a three storey home organises space is qualitatively different from what a single or double storey design can achieve.
Separation of zones. Families with teenagers or older children who need genuine independence from the main household find three storeys genuinely transformative. A full retreat on the third level, with its own living space, bathroom, and study nook, operates almost as a separate suite. Parents retain the master on the second level with their own zone, while the ground floor becomes a genuinely shared family and entertaining space. This is a layout that a double storey home can approximate but rarely delivers cleanly.
Outlook. In coastal WA, elevation is everything. The difference between a view of a neighbour’s rooftop and an uninterrupted sweep of the estuary or the Indian Ocean is often just one storey. Positioning the main living areas on the second or third level transforms how the home feels to live in every single day, not just when you have guests.
Thermal performance. A well-designed three storey home can perform thermally in ways that surprise people. Natural ventilation through a central void or stairwell moves warm air upward and out through high-level windows. The upper floors benefit from cross-breezes that lower-level rooms never access. Carefully positioned eaves and shading on the northern and western elevations can reduce solar gain dramatically. None of this is accidental, and it depends on orientation and design intent from the earliest stages.
Street presence. In newer estates and coastal suburbs, a three-level home holds its own architecturally in a way that a single storey home stretched to its site boundaries simply cannot. This matters not just aesthetically but for long-term property value in areas where the streetscape is still being established.
What the Planning Process Looks Like in WA
Building a three storey home in Western Australia requires engagement with a planning framework that is more involved than for standard residential construction. This is not a reason to avoid it; it is a reason to understand it from the start.
Local Government Authority approval. Three storey homes almost always require Development Approval (DA) from the relevant local government authority. In the Peel region, this means Shire of Murray or City of Mandurah depending on the lot’s location. Each authority has its own R-Codes provisions, acceptable development criteria, and design review processes for buildings that exceed the standard two-storey threshold.
The key matters assessed in a DA typically include overlooking and privacy impacts on neighbouring properties, overshadowing (the extent to which the building casts shadow on adjacent lots), and visual bulk and scale in relation to the streetscape and surrounding development. These are assessable criteria, not automatic barriers, but addressing them well requires a design that genuinely considers neighbouring amenity rather than simply maximising floor area.
Building permits. Beyond planning approval, a three storey home requires a building permit under the Building Act 2011 (WA). The structural engineering requirements for a three-level timber frame or steel frame are more complex than for a conventional home. This is not something a builder handles as a secondary consideration. It needs to be integrated into the design from the outset.
Energy efficiency. All new homes in WA must meet a minimum 6-star NatHERS energy rating. For a three storey home, achieving this is achievable but depends on window placement, glazing specifications, insulation, and external shading. Getting to 7 or 8 stars is increasingly common in coastal builds where the orientation and cross-ventilation opportunities are significant.
Bushfire Attack Level (BAL) ratings. Parts of the Peel region and Perth’s outer southern suburbs carry BAL ratings that affect material selection. A three-level home in a BAL-29 or BAL-FZ zone requires specific glazing, external cladding, and construction details. This is a mandatory consideration that affects both design and cost, and it needs to be resolved before a building permit application is lodged.
Design Principles That Make Three Storey Homes Work
Not every three storey home is a successful three storey home. The ones that feel generous, liveable, and genuinely connected to the way the family uses space are the ones designed with some consistent principles in mind.
Start with the site. The orientation of the block, its slope, its relationship to the street, the direction of the prevailing summer sea breeze, where the neighbours sit relative to the proposed upper floors: all of this should drive the massing and layout decisions before any floor plan is drawn. A design that works with the site rather than against it is a design that performs better, costs less to run, and is more pleasant to occupy.
Design for the view, then for privacy. In coastal locations, the temptation is to maximise glazing on every elevation to capture every possible sightline. The more considered approach is to identify the primary view corridor and design large openings there, while treating other elevations more carefully to manage overlooking into neighbouring properties. A large window facing a neighbour’s backyard is not just a planning problem. It is a daily livability problem for everyone involved.
Vertical circulation matters more than people expect. In a three storey home, the staircase is not a background element. It is a central feature that every member of the household uses multiple times a day. Stairs that are too steep, too narrow, or positioned in an awkward corner of the plan make the home feel laborious to inhabit. A generous, well-lit stair with a thoughtful landing configuration makes moving between floors feel natural.
Storage on every level. One of the most common complaints about multi-level homes is that everyday items end up in the wrong place. School bags, sporting equipment, laundry, cleaning supplies: if storage is only provided on the ground floor, daily life involves carrying everything up and down repeatedly. Designing storage into each level, even modest linen cupboards and under-stair spaces on the upper levels, makes the home function far better.
Lift-readiness. This may not be something a young family is thinking about at the design stage, but a three storey home that is designed to be lift-ready from the outset, with a structural void that could accept a through-floor lift later, is significantly easier and less expensive to retrofit than one where the possibility was never considered. It is a small design decision with significant long-term implications for how long the home remains appropriate for the family as circumstances change.
Choosing the Right Builder
Three storey homes are not a standard residential product, and they should not be approached as one. The builder who has delivered dozens of single and double storey homes in a suburb may not have the specific experience, the structural engineering relationships, or the subcontractor network to execute a three-level home well.
The questions worth asking before engaging a builder include: how many three storey homes have they completed, and are those projects available to inspect? What is their process for managing structural engineering and energy compliance from the design stage rather than retrofitting it? Do they have experience with the specific planning requirements of the local government authority where your block sits?
Families planning three storey homes in Mandurah and the Peel region benefit from working with builders who understand the local terrain, the council’s DA expectations, the coastal construction conditions, and the way the afternoon sea breeze behaves on a block in Dawesville versus one in Singleton. That site-specific knowledge is not something you can import from a volume builder’s standard process.
Fixed price contracts matter in this context. Three storey homes have more variables than standard residential builds, and a contract that exposes the owner to provisional sum overruns on structural or civil elements transfers significant financial risk onto the client. Knowing the cost before construction begins is a basic expectation that the right builder can meet.
A Home That Grows With the Family
There is something worth saying about the long view on three storey homes that does not get said enough. These homes are not just about solving a current space problem. They are about building something that remains genuinely useful as the family changes shape.
Children who are at primary school become teenagers who need space. Teenagers become young adults who might live at home while studying. Ageing parents might join the household. A home office might become a necessity. The spare bedroom on the third level that serves as a guest room for years might become something quite different over time.
A three storey home, when designed with flexibility built in from the start, accommodates that evolution better than a single-level home that has nowhere to go and better than a double-storey home where the zones are more rigidly defined.
The families who build three storey homes in the Peel region and Mandurah area and find them most satisfying tend to be the ones who thought clearly about how they actually live, what the block makes possible, and what they want the home to be in ten or fifteen years. That clarity, combined with a design and construction team who genuinely understand the brief and the site, is what produces a home that earns its third storey.