Melbourne keeps growing, and the classic quarter acre block now works harder than ever. If you own a large block in the suburbs, or you plan to buy one, a multi-unit development lets you turn one home into several. You can build townhouses to sell, keep them as rental investments, or hold one for yourself and sell the rest to fund your next move.

At Ansel Homes, we build homes across Melbourne, and landowners regularly ask us the same first question: where do I start? This guide answers it. We walk you through the planning rules, the budget, the design, the subdivision and the build, and we share the lessons we see play out on real sites.

What Is a Multi-Unit Development?

A multi-unit development means building two or more dwellings on a single lot. People use several labels for it, so it helps to know what each one means.

•        Dual occupancy: two dwellings on one lot, usually side by side or one behind the other.

•        Townhouse development: three or more dwellings, typically two storeys, often sharing walls.

•        Villa units: single storey homes that share a common driveway.

•        Low-rise apartments: small residential buildings of up to three storeys, which Victoria assesses under the same Clause 55 rules as townhouses.

Councils assess all of these as "two or more dwellings on a lot", so the same planning logic applies whether you plan two homes or six.

Why Multi Unit Development Works in Melbourne

Land is usually the biggest single cost in any Melbourne build. When you spread that cost across several homes, the land price per dwelling drops. At the same time, demand for well-located townhouses stays strong. Downsizers want low-maintenance homes, first home buyers want something more affordable than a detached house, and investors want solid rental yields near transport, schools and shops.

The Victorian Government also wants more homes in established suburbs. It introduced the Townhouse and Low-Rise Code in 2025 to give townhouse projects a faster, more predictable path through council. That does not guarantee a profit, because results depend on your site, your costs and the market when you sell. It does mean the planning system now gives well-designed projects a clearer runway.

Step 1: Check Your Site Before You Spend a Dollar

Every successful multi-unit project starts with a site assessment. We always tell clients to do this before they sign a contract on a block, not after. A few checks save a lot of regret.

•        Zoning: the General Residential Zone, Neighborhood Residential Zone, Residential Growth Zone and Mixed Use Zone all carry different expectations for height and density.

•        Overlays: heritage, vegetation protection, flooding, bushfire and design overlays can limit what you build or add extra approval steps.

•        Lot size and shape: wide frontages and corner blocks give you more design freedom, while narrow, deep lots make driveways and parking harder.

•        Slope and soil: a steep fall or reactive clay changes your engineering and your budget.

•        Easements and services: sewer lines, drainage easements and power connections can decide where you can place each home.

•        Trees: council can protect large trees on your block or next door, and tree roots can shift your building envelope.

If an old house already sits on the block, you also need a plan for removing it. Our knockdown and rebuild service covers that stage, and our article on how much it costs to demolish a house in Melbourne helps you budget for it.

Step 2: Understand the Planning Permit Process

In Victoria, you need a planning permit to build two or more dwellings on a lot in a residential zone. Your council assesses the application against Clause 55 of the planning scheme, which the state calls the Townhouse and Low-Rise Code. It replaced the older ResCode for buildings up to three storeys, and it applies to applications lodged on or after 6 March 2025.

The biggest change is the deemed to comply pathway. If your design meets the numbers in a standard, the objective behind that standard is automatically met. Designers now know the targets up front, and councils can decide faster. You still need a permit, though, and council still weighs neighborhood character and amenity. Depending on the application, council may also notify your neighbors.

Buildings of four storeys fall under Clause 57, and the state has also been rolling out a Mid-Rise Code for taller projects. Planning rules change often, so confirm the current requirements with your council and the Victorian Government planning website before you lock in a design. A local town planner will also give you advice that fits your exact street.

What the Council Looks At

Expect your assessment to cover building height, setbacks from boundaries, site coverage, permeable surfaces, private open space, car parking, overlooking, overshadowing, waste storage and landscaping. If your drawings address these early, you avoid most requests for further information, and those requests are what usually stretch a permit timeline.

Step 3: Build a Realistic Budget

Developers who run into trouble usually underestimate the costs around the building, not the building itself. Map out every line before you commit.

•        Land purchase and stamp duty

•        Demolition and site clearing

•        Town planning, architectural, engineering and survey fees

•        Council fees and development contributions

•        Connections for water, sewer, power, gas and internet

•        Civil works such as driveways, crossovers and drainage

•        Construction of each dwelling

•        Landscaping, fencing, letterboxes and bin areas

•        Subdivision and title costs

•        Finance interest and holding costs

•        Agent fees, marketing and legal costs when you sell

•        GST, where it applies

We also recommend a contingency buffer, commonly between 5 and 10 percent of construction cost. Soil conditions, service relocations and council conditions all create surprises, and a buffer keeps a small surprise from becoming a stalled project.

Talk to your lender early, because banks assess multi dwelling projects differently from a single home loan. Our home financing page explains the support available. For a wider view of costs and timelines when you replace an existing house, read our knockdown rebuild guide for Melbourne.

Step 4: Design Homes That Buyers and Tenants Want

Meeting the planning standards gets you a permit. Great design gets you a strong sale price or a reliable tenant. We have seen projects that tick every council box and still sit unsold because the layouts felt cramped or dark.

•        Give every home a private courtyard or balcony that gets real sunlight.

•        Orient living areas to the north where the block allows it.

•        Separate each home with clear entries, so each one feels like its own address.

•        Vary the facades and materials, so the group reads as a considered streetscape and not a row of copies.

•        Plan storage, laundry space and bin areas from the first sketch.

•        Meet or beat the minimum energy efficiency rating for new Victorian homes, because lower energy bills appeal to buyers.

You can browse our home designs to see how we use space, light and layout, and you can walk through our display homes to judge our finishes and quality in person. Our awards page shows how the industry has recognized our work.

Step 5: Plan Your Subdivision and Titles

You can build several dwellings on one lot without subdividing, and some investors keep a single title and rent every home. If you want to sell each home separately, you need to subdivide. Clause 56 of the planning scheme covers residential subdivision, and many owners lodge the development and subdivision applications together to save time.

After construction, your surveyor lodges the plan of subdivision, you receive a statement of compliance, and the titles office issues new certificates of title. If your homes share a driveway or other common areas, an owner’s corporation usually manages them. Work with a licensed surveyor and a conveyancer early, because title decisions affect your design as much as your sale.

Step 6: Choose the Right Builder and Manage the Build

A multi-unit project asks more of a builder than a single home does. You need someone who coordinates trades across several dwellings, keeps neighbors informed, and protects your timeline. Before you sign, check these points.

•        The builder holds current registration with the Building and Plumbing Commission.

•        The builder offers a written, fixed price contract that follows the Domestic Building Contracts Act.

•        The builder provides domestic building insurance where the law requires it.

•        The builder can show completed projects and give you references you can call.

•        The builder explains progress payment stages in plain language.

Bring your builder in early, before the planning drawings are final. We can flag costly design choices while changes still cost little, and that single step often saves more money than any negotiation later. Ansel Homes holds memberships with HIA, Master Builders and Engineers Australia, and you can learn more about our team on our about page.

How Long Does a Multi-Unit Development Take?

Every project differs, so treat these as typical ranges, not promises. Feasibility and design often take one to three months. The planning permit stage can run for several months, depending on your council and whether it asks for more information. Engineering and the building permit usually add one to two months. Construction of a small group of townhouses commonly takes eight to twelve months. Subdivision and new titles follow after that.

Delays almost always trace back to the same causes: incomplete drawings, late changes after the permit, and slow responses to council. You control most of those.

Common Mistakes We Help Owners Avoid

•        Buying a block before running a feasibility study.

•        Designing to the bare minimum and ignoring what buyers want.

•        Forgetting service connections, retaining walls and tree protection in the budget.

•        Changing the design after the permit, which can trigger an amendment and more fees.

•        Ignoring neighbors until the notice period starts.

•        Skipping the contingency buffer.

What We Have Learned on Site

Over time, builders learn that the paperwork and the site tell different stories. A plan can look perfect and still hide a drainage problem, a tight crane position or a boundary fence that sits in the wrong place. We walk every site before we price it, and we ask owners to do the same before they buy. We also tell people honestly when a block does not suit multiple dwellings, because an early "no" costs far less than a stalled build.

If you want to compare a multi-unit plan against a simpler option, our guide on whether it is cheaper to renovate or knock down and rebuild lays out the trade offs from a builder’s point of view. You can also explore our house and land packages if a single new home suits your goals better.

Why Work with Ansel Homes

Ansel Homes is a Melbourne builder based in Derrimut. We design and build custom homes, house and land packages, and knockdown rebuild projects, and we hold registrations and memberships you can verify. We give clear answers, we explain costs in plain language, and we stay in touch from the first conversation to handover. When you plan multiple dwellings, that steady communication matters as much as the bricks and timber.

Ready to talk about your block? Book a consultation with our team or call us on +61 1300 026 735.

How many dwellings can I build on my block in Melbourne?

No single number applies to every block. Your zone, lot size, frontage, overlays and the Clause 55 standards decide how many homes fit. A feasibility study with a builder or town planner gives you a clear answer before you buy.

Do I need a planning permit to build multiple dwellings?

Yes. In Victoria’s residential zones, you need a planning permit to build two or more dwellings on a lot. You also need a building permit before construction starts.

What is the minimum block size for a multi-unit development?

Victoria does not set one state-wide minimum lot size. Council policy, zoning and the planning code shape what fits. As a rough guide, many projects work best on blocks of 600 square meters or more, although wide corner blocks can sometimes work at a smaller size.

How long does it take to complete a multi-unit development?

From first feasibility to finished homes, most projects take well over a year. The planning permit and the construction stage take the longest, and good preparation shortens both.

Can I keep my existing house and build behind it?

Often you can, provided the setbacks, parking and open space standards still work. A retain and build approach can cut demolition costs, but it also limits your design options. We recommend comparing both paths before you decide.

Do I have to subdivide to build multiple dwellings?

No. You can build several dwellings on one lot and keep a single title. You need to subdivide only if you want to sell each home on its own title.

Do I pay GST on a multi-unit development?

Selling new residential premises generally involves GST, and special rules such as the margin scheme may apply. Speak with your accountant before you commit, because the structure of your project affects your tax position.

Is a multi-unit development a good investment?

It can be, but it carries real risk. Your return depends on land cost, construction cost, holding costs and the market at sale or rental. This article offers general information and does not replace advice from a licensed financial adviser or accountant.

Can Ansel Homes help if I need to demolish an existing house first?

Yes. Our knockdown and rebuild team can guide you through demolition and the build that follows. Contact us through our website to discuss your site.

A multi-unit development rewards owners who prepare well. Check the site first, learn the planning rules, build a realistic budget, design for the people who will live there, and choose a builder who communicates clearly. Do those five things and you give your project a strong start.

When you want a builder who will look at your block honestly and help you plan the next step, get in touch with Ansel Homes today. You can also browse our latest blogs for more guidance on building in Melbourne.