Site Orientation Explained: Best Orientation for a House in Australia

Site orientation is one of the most important — and most overlooked — factors in the comfort and energy efficiency of a new home. In Australia, a well-oriented home uses the sun for free winter heating, shades against summer heat, and captures cooling breezes. A poorly oriented home is expensive to heat and cool, uncomfortable to live in, and harder to sell.

The key is that orientation is determined by the block. Once you buy the block, the orientation of the house is largely fixed by the block shape, the street frontage, and the setback requirements. This is why it is essential to check the orientation before buying — a poorly oriented block cannot be fixed by a good house design.

The Principles of Good Orientation

In Australia (southern hemisphere), the sun is in the north at midday. The sun is lower in the sky in winter and higher in the sky in summer. Good orientation uses this difference to let winter sun in (for warmth) and keep summer sun out (for cooling).

The Ideal Orientation

The ideal orientation for a home in most of Australia is:

• **Living areas (living, dining, kitchen) facing north** — This captures winter sun for warmth and can be shaded in summer with eaves, pergolas, or awnings.
• **Bedrooms facing south (or east)** — South-facing bedrooms stay cool in summer and don't need as much heating in winter (people sleep better in cooler rooms).
• **Service areas (bathroom, laundry, garage) facing west** — West-facing walls get hot afternoon sun, so placing service areas on the west side shields the living and sleeping areas from the heat.
• **Minimal west-facing windows** — West-facing windows let in hot afternoon sun, which is difficult to shade and makes the home uncomfortable and expensive to cool.
• **Eaves or shading on north and west** — Eaves on the north side let in winter sun (when the sun is low) and exclude summer sun (when the sun is high). West-facing windows need vertical shading (blinds, shutters, or planting).

How Block Shape Affects Orientation

The orientation of the house is largely determined by the block shape and the street frontage. The most common block orientations are:

A north-facing block (street on the south side) is the most desirable because the back of the house — where living areas are typically located — faces north, capturing the winter sun. A south-facing block is the most challenging because the back of the house faces south (no sun).

Eaves and Shading

Eaves (the overhang of the roof past the wall) are one of the most effective passive solar design features. Properly designed eaves on the north side of the house:

• Let in the low winter sun (when the sun angle is low) — warming the living areas for free
• Exclude the high summer sun (when the sun angle is high) — keeping the living areas cool
• The correct eave width depends on the latitude and the window height — typically 450–900mm for standard ceiling heights

Many volume builders now offer eaves as an option or include them only on the front facade. If you want passive solar performance, make sure eaves are included on the north side (and ideally the west side) of the house, not just the front.

Cross-Ventilation and Cooling Breezes

In addition to sun control, good orientation considers cooling breezes. In most of Australia, cooling breezes come from the east, south-east, or north-east in the afternoon. A well-designed home captures these breezes by:

• Placing windows on opposite sides of the room (to allow air to flow through)
• Aligning openings with the prevailing breeze direction
• Using casement or awning windows that can direct the breeze into the room
• Designing the house with a through-path for air flow (from one side to the other)

Neighbouring Shadows

Even if your block has good orientation, neighbouring buildings can cast shadows that block the winter sun. This is a particular issue in:

• Established suburbs — two-storey neighbouring houses can cast long shadows, particularly in winter when the sun is low
• New estates with narrow lots — the houses are close together, and two-storey houses on the south side can shadow the north-facing living areas of the house on the north side
• South-facing slopes — if the block is on the south side of a hill, the hill itself can block the winter sun

Before buying, check the height and proximity of neighbouring buildings (or planned buildings, if the estate is new) on the south side of the block. A two-storey house immediately to the south can significantly reduce the solar access of a north-facing living area.

How Orientation Affects Energy Costs

A well-oriented home can reduce heating and cooling energy costs by 20–40%. For a typical Australian home, this can save $300–$800 per year — and $6,000–$16,000 over 20 years. The savings come from:

• Less heating in winter (the north-facing living areas capture free sun warmth)
• Less cooling in summer (eaves exclude the high summer sun, and cross-ventilation provides free cooling)
• Less reliance on artificial lighting (north-facing rooms have good natural light)

What to Check Before Buying Land

Common Mistakes

• Not checking the orientation before buying — a poorly oriented block cannot be fixed by a good house design.
• Prioritising the street facade over the orientation — a house that looks good from the street but has living areas facing south will be cold and expensive to heat.
• Not checking neighbouring shadows — a north-facing block with a two-storey house immediately to the south may not get the winter sun.
• Not including eaves on the north side — without eaves, the north-facing windows let in too much summer sun.
• Large west-facing windows without external shading — the biggest source of summer heat gain.
• Not considering cross-ventilation — a house that cannot capture cooling breezes will need more air conditioning.

Frequently Asked Questions