How Block Orientation Impacts Your Granny Flat Floor Plan

When planning a granny flat, block orientation is one of the most influential factors in creating a comfortable and efficient home. The way your site receives sunlight affects temperature control, privacy, window placement and the overall experience of the space.

By designing a floor plan that responds directly to your block’s orientation, you’ll achieve a granny flat that feels naturally brighter, more comfortable and more economical to run.

Below is a breakdown of how each orientation impacts design — and how to take advantage of it.

Why Block Orientation Matters

The direction your block faces influences:

• levels of natural sunlight
• year-round temperature comfort
• heating and cooling efficiency
• privacy between the granny flat and the main home
• the ideal positioning of windows, doors and outdoor areas

Understanding how the sun moves across your property is the foundation of a well-designed granny flat.

North-Facing Block: The Most Ideal Layout

North-facing sites are considered the best orientation in Australia due to their consistent daylight and warmth.

How to Optimise Your Floor Plan

• place living and dining spaces on the northern side
• include large windows or sliding doors for passive solar gain
• use shading or eaves to block summer heat while allowing winter sun
• position bedrooms to the east or south for softer light

A north-oriented layout creates a comfortable environment year-round with minimal energy use.

East-Facing Block: Light-Filled Mornings

East-facing blocks enjoy bright morning light and cool afternoons — ideal for people who prefer early sunlight.

Best Layout Strategies

• position bedrooms on the eastern side to capture morning sun
• locate living spaces to the north or east where possible
• minimise west-facing windows to reduce afternoon warmth
• add landscaping or screens to buffer western heat

This orientation supports a fresh, cool feel later in the day.

West-Facing Block: Reducing Afternoon Heat

West-facing blocks receive intense afternoon sun, so careful planning is essential to maintain comfort.

How to Design for Thermal Control

• limit west-facing windows in key living areas and bedrooms
• place laundries, bathrooms or storage zones on the western side
• position living areas to the north or east
• use external shading, trees or screens to block heat

Small design adjustments can make a significant difference in energy efficiency.

South-Facing Block: Even, Gentle Light

South-facing blocks provide consistent but cooler light, which requires thoughtful design to avoid dark or chilly interiors.

Floor Plan Tips

• orient primary living areas to the north where possible
• use skylights or highlight windows to brighten internal spaces
• create outdoor living to the north or east
• allocate southern walls for utility spaces like bathrooms or laundries

This approach helps maintain a calm, balanced atmosphere throughout the home.

Consider the Orientation of the Main Home

A granny flat positioned beside or behind the main dwelling must also account for:

• privacy between households
• noise separation
• driveway or path access
• overshadowing from the main house

What to Prioritise

• avoid placing the granny flat where it will sit in shade all day
• locate outdoor living areas where they won’t face directly into the main house
• design entries to ensure independent access

These considerations help the granny flat function as its own private, self-contained home.

Outdoor Living and Orientation

A well-positioned outdoor area enhances comfort and usability.

• North-facing: ideal for year-round terraces or decks
• East-facing: perfect for morning seating areas
• West-facing: best for secondary outdoor spaces unless well shaded
• South-facing: suitable for utility zones or cooler garden spaces

Outdoor placement should support both privacy and seasonal comfort.

Bringing It All Together: Designing With Orientation in Mind

The best granny flat floor plans take orientation into account by incorporating:

• natural light in key living zones
• strategic shading to prevent overheating
• passive design principles for year-round comfort
• window and door placement that protects privacy
• outdoor living that aligns with climate and lifestyle

When you design your granny flat with orientation as a guiding factor, you create a space that feels bright, efficient and incredibly comfortable — without adding to the construction cost.