Second Storey Additions: What You Need to Know

Second Storey Additions: What You Need to Know

Adding a second storey is one of the most effective ways to increase your home’s living space without sacrificing garden area. But before you start planning, there are important regulations to understand.

Height Limits

Under the R-Codes, building height is measured in both metres and storeys. For most residential areas:

• Maximum wall height: 6-7 metres (varies by R-Code)

• Maximum overall height: 9 metres

• Maximum storeys: 2

Some areas have stricter limits. Heritage and character areas may restrict you to single storey plus loft (3.5m wall height, 6.5m ridge).

Overlooking and Privacy

This is often the biggest challenge with two-storey additions. The R-Codes require:

• Major openings (windows to living areas) setback from boundaries based on height

• Cone of vision assessments from upper floor windows

• Screening or obscure glazing to windows within 7.5m of outdoor living areas

Strategies to Address Privacy

• Highlight windows (sill at 1.6m above floor level)

• Fixed obscure glazing to lower portions of windows

• Screening devices that limit sight lines

• Orienting windows away from sensitive areas

Corner Lot Considerations

For corner lots, second storey additions must consider:

• Secondary street setbacks

• Avoiding continuous walls to the secondary street

• Prevailing streetscape patterns

Structural Considerations

Not all homes are suitable for second storey additions. Factors include:

• Existing foundation capacity

• Wall construction (double brick vs timber frame)

• Roof structure

• Site access for construction

Planning Your Addition

A second storey can transform your home, but it requires careful design to meet regulations and maintain good neighbour relations. Contact me for a feasibility assessment of your property.

Disclaimer: This article is provided for general information purposes only. Requirements and regulations may change, and specific circumstances vary. Always consult current legislation, your local council, and qualified professionals before making decisions about your project.