How Much Does a Granny Flat Cost in Melbourne? (2026 Guide)

Thinking about building a granny flat in Melbourne?

One of the first questions most homeowners ask is: "How much does a granny flat actually cost?"

The answer depends on several factors including size, design, site conditions, finishes, council requirements, and whether you are building a simple backyard studio or a fully self-contained secondary dwelling.

At Brownlow Building, we design and build custom granny flats in Melbourne and Victoria, and this guide will help you understand realistic costs in 2026.

Average Granny Flat Costs in Melbourne (2026)

As a general guide, custom granny flat projects in Melbourne typically fall within the following ranges:

Granny Flat Type	Indicative Investment
Studio Granny Flat (30–40m²)	$140,000 – $190,000
1 Bedroom Granny Flat (40–50m²)	$180,000 – $240,000
2 Bedroom Granny Flat (50–60m²)	$220,000 – $320,000+
Premium Custom Designs	$300,000+

These figures are indicative only and subject to site conditions, services, selections and approvals.

What Impacts the Cost of a Granny Flat?

No two blocks are the same. The total investment can vary depending on several key factors.

1. Size & Layout

Larger granny flats naturally require more materials, more labour, additional services and increased design complexity.

A studio granny flat may suit guests, home offices or teenage retreats.
A one-bedroom granny flat is popular for independent living or rental income.
A two-bedroom granny flat offers greater flexibility for multigenerational living.

2. Site Conditions

Your block can significantly affect build costs. Factors may include:

Site access restrictions
Sloping land
Existing landscaping
Tree protection zones
Easements
Rock excavation

Sites in established suburbs such as Kew, Hawthorn, Brighton, Brunswick and Northcote often require additional planning and access considerations.

3. Planning & Council Requirements

Depending on your site, your granny flat may require:

Town planning advice
Building permits
Engineering documentation
Energy assessments
Service authority approvals

Planning overlays, zoning and neighbourhood character controls may affect feasibility and design.

For planning requirements, see Planning Victoria.

4. Services & Infrastructure

Connecting your granny flat to existing services can influence overall costs. This may include:

Sewer connections
Stormwater upgrades
Electrical upgrades
Gas connections
NBN and communications

5. Finishes & Specifications

Your selections also play a major role. Examples include:

Flooring
Kitchens
Appliances
Bathrooms
Heating and cooling
External cladding

Premium finishes can significantly enhance rental appeal and resale value.

What's Included in a Brownlow Granny Flat?

Brownlow Building delivers turnkey granny flats across Melbourne, including:

✔ Site consultation and feasibility advice
✔ Design and drafting
✔ Engineering coordination
✔ Council and permit assistance
✔ Fixed-price building contracts
✔ Full construction and project management
✔ Internal finishes and fixtures
✔ Final handover ready for occupancy

Hidden Costs Many Builders Don't Talk About

When comparing granny flat quotes, make sure you understand what's included. Common overlooked costs include:

Excavation and site preparation
Service upgrades
Drainage works
Council contributions
Permit disbursements
Landscaping and external works

A lower quote may not always represent the true project cost.

Do Granny Flats Add Value to Property?

In many cases, yes. A well-designed granny flat can provide:

✔ Additional rental income
✔ Multigenerational living flexibility
✔ Increased property functionality
✔ Improved resale appeal

For many Melbourne homeowners, granny flats are both a lifestyle upgrade and long-term investment.

Popular Granny Flat Designs

At Brownlow Building, our most popular designs include:

Retreat 35 — Studio

Ideal for home offices, guest accommodation or teenage retreats.

Retreat 50 — 1 Bedroom

Perfect for independent living or rental opportunities.

Retreat 60 — 2 Bedroom

Designed for family flexibility and multigenerational living.

👉 View our granny flat floor plans and designs

Granny Flat Builders Across Melbourne & Victoria

We design and build granny flats across:

Inner West Melbourne — Yarraville, Seddon, Footscray
Inner North Melbourne — Brunswick, Northcote, Fitzroy
Inner East Melbourne — Hawthorn, Kew, Camberwell
Bayside Melbourne — Brighton, Hampton, Sandringham
Regional Victoria — Geelong, Ballarat, Mornington Peninsula

Frequently Asked Questions

What is the cheapest granny flat to build?

Studio granny flats are typically the most cost-effective, depending on site conditions and finishes.

Can I build a granny flat under 60m² in Victoria?

In many cases, yes — subject to zoning, overlays and building regulations.

How long does it take to build a granny flat?

Most projects are completed within approximately 16–24 weeks, depending on approvals and complexity.

Can I rent out a granny flat in Victoria?

This depends on planning controls, title conditions and local requirements.

Arrange a Granny Flat Feasibility Consultation

If you're considering building a granny flat, the first step is understanding what's possible on your block. Brownlow Building can assess your site, discuss design options, and provide practical advice on costs, approvals and timelines.

Talk to our granny flat builders Melbourne →