The Complete Guide to Building a Granny Flat in Sydney or Perth

A well-designed granny flat can provide extra space, boost property value, or generate rental income — making it one of the smartest additions to any property in Sydney or Perth. But before you start building, there are key things you need to know to stay compliant, on budget, and aligned with your goals.

Why Build a Granny Flat?

Granny flats offer flexible living solutions for:

• Extended family accommodation

• Teenage retreats or home offices

• Rental income opportunities

• Downsizing without moving

As land and housing prices rise, more Sydney and Perth homeowners are unlocking the potential of their backyards with high-quality, self-contained granny flats.

Council Regulations You Should Know

Each local council in NSW and WA has different rules around:

• Minimum lot sizes

• Setbacks and height limits

• Private access and parking

• Maximum floor area (usually 60m² in NSW)

Tip: Always work with a builder who understands local council approval processes. At Sky Building Construction, we guide you through compliance to avoid costly delays.

Granny Flat Design & Planning Tips

When designing a granny flat, think long-term. Consider:

• Open-plan layouts to maximise space

• Energy-efficient lighting and insulation

• Accessibility features for elderly occupants

• Separate entry for privacy (ideal for rental)

We’ll help you customise the layout to meet your needs while ensuring a smart use of space and materials.

Costs and Timelines

In Sydney and Perth, granny flat construction costs typically range between $120,000 and $200,000+ depending on size, finishes, site access, and services. Timelines can vary from 8 to 16 weeks, depending on approvals and complexity.

Tip: Always allow time for site preparation and council paperwork — not just the build.

Why Choose Sky Building Construction?

With years of experience building granny flats in Sydney and Perth, our team offers:

• Fixed-price quotes

• Turnkey project delivery

• End-to-end management — from approvals to handover

• Modern, functional, and code-compliant designs

We take the stress out of the process and ensure every granny flat we build is crafted with care, precision, and purpose.

Want to explore your backyard’s potential? Contact us for a free granny flat consultation today.

This custom-built granny flat in Penshurst, NSW was designed to maximise functionality and comfort within a compact footprint. Featuring an open-plan kitchen and living area, private bedroom, modern bathroom, and laundry, the space was thoughtfully laid out to provide independence and ease of use for the occupant. Link here.