What Can I Build on My Block?

The Five Things That Determine What You Can Build

Whether you are thinking about a granny flat, a duplex, a knockdown rebuild or a subdivision, the same five factors decide whether your block can support it. Work through them in order, because a hard "no" at any step can save you thousands in design fees.

1. Zoning

Zoning is the starting point. Every block sits in a zone that sets which land uses are permitted, which need approval, and which are prohibited. Residential zones range from low-density zones that protect single-dwelling character through to higher-density zones that allow townhouses and apartments.

Zoning also brings development standards with it. Councils commonly set controls such as maximum building height, floor space ratio or site coverage, and minimum lot sizes for particular development types. These vary by council and by zone, so the same zone label can mean different numbers in different areas.

2. Overlays and hazard mapping

Overlays sit on top of zoning and add extra controls for specific issues. Common ones include:

• Flood – may limit floor levels, require flood studies, or restrict some development entirely
• Bushfire – triggers construction standards and can rule out fast-track approval pathways
• Heritage conservation areas – add design controls even when your own house is not listed
• Vegetation and biodiversity – can protect trees or habitat on the block
• Landslip, acid sulfate soils and contamination – add investigation requirements

A block can be perfectly zoned for your project and still be heavily constrained by an overlay. Always check both.

3. Lot size and frontage

Councils commonly set minimum lot sizes and minimum street frontages for development types such as dual occupancies, secondary dwellings and subdivisions. A block that is big enough on paper can still fail on frontage, and corner lots are often treated differently from mid-block lots.

Do not rely on the area shown in a real estate listing. The registered plan for your lot is the authoritative source, and the difference matters when you are near a minimum threshold.

4. Heritage

Heritage works at two levels: an individual listing on your property, or a conservation area covering your street or suburb. Either can restrict demolition, limit the scale and style of new work, and remove fast-track approval options. Heritage does not always mean you cannot build, but it usually means more design constraints, more documentation and a longer approval process.

5. Easements, covenants and other title constraints

This is the step most people skip, and the one that most often kills a project late. Your certificate of title and its associated instruments can contain:

• Easements – rights over part of your land, commonly for drainage or sewerage. You generally cannot build over them without the beneficiary's consent
• Restrictive covenants – private restrictions that can limit dwelling numbers, materials or building envelopes, sometimes decades old but still enforceable
• Rights of way – access rights for neighbours or utilities that cut into your usable area

None of these appear on a zoning map. They only show up when you search the title and read the registered instruments, which is exactly why so many owners discover them after paying for a design.

NSW, VIC and QLD: How Each State Works

The five factors above apply everywhere in Australia, but each state runs its own planning system with its own names and maps.

New South Wales

Zoning and core development standards live in your council's Local Environmental Plan (LEP), with finer detail in a Development Control Plan (DCP). State policies (SEPPs) sit above these and create state-wide pathways for things like secondary dwellings. The NSW Planning Portal's Spatial Viewer shows zoning and many overlays for free, and a Section 10.7 planning certificate from council gives official confirmation of what applies. Title constraints such as easements and covenants are typically found in the 88B instrument attached to the deposited plan.

Victoria

Every Victorian council operates a planning scheme built from standard zones and overlays. Residential zones (such as the Neighbourhood Residential, General Residential and Residential Growth zones) signal how much change is expected in an area, and overlays such as heritage, vegetation protection and flooding are mapped separately. The state's free planning property reports show the zones and overlays for any address. Title constraints appear on the certificate of title and the plan of subdivision, and covenants are common in older subdivisions.

Queensland

Each Queensland council has its own planning scheme (for example, Brisbane's City Plan) that sets zones, overlays and assessment levels. Development is categorised by how it is assessed: some work is accepted without approval if it meets set standards, while other work needs code or impact assessment. Councils publish interactive mapping showing zones and overlays such as flood, bushfire and character areas. Title searches and registered plans come through the state's land registry and reveal easements and covenants.

Worked Example: Assessing a Suburban Block

Here is how the five checks play out on a hypothetical block: a roughly 600sqm mid-block lot in a general residential zone, with an older single dwelling on it, and an owner wondering about a dual occupancy.

1. Zoning – The zone permits dual occupancy with consent. Good start, but the council's controls set a minimum lot size and frontage for dual occupancy, so the numbers need checking.
2. Overlays – The mapping shows no flood or bushfire affectation, but the street is on the edge of a heritage conservation area. This block sits just outside it. Had it been inside, demolition and design would face extra controls.
3. Lot size and frontage – The registered plan confirms the lot meets the council's minimum area for dual occupancy, but the frontage is marginal. That points towards an attached side-by-side design being harder, and a front-and-back configuration more realistic.
4. Heritage – No individual listing on the property. Clear.
5. Title – The title search reveals a drainage easement running across the rear of the lot. Nothing can be built over it, which shrinks the buildable envelope for a rear dwelling and forces the design to work around it.

Verdict for this block: a dual occupancy looks possible in principle, but the easement and the marginal frontage shape what can actually be designed, and council consent is still required. That is a typical outcome. The constraints rarely say a flat "no", but they decide the form, cost and approval pathway of what you build. Finding the easement at this stage, rather than after paying for architectural drawings, is the whole point of checking in this order.

How to Check Your Own Block

1. Look up your zoning and overlays – Use your state's free planning portal or your council's online mapping. Note the zone, any overlays, and the controls that apply.
2. Confirm your lot dimensions – Get the registered plan for your lot rather than trusting listing figures, and compare area and frontage against council minimums for the development type you have in mind.
3. Search your title – Order a title search and the associated instruments to find easements, covenants and rights of way. This is the step that surfaces the deal-breakers.
4. Read the local controls – Council development controls cover setbacks, landscaping, parking and privacy. They rarely block a project outright but they shape the design.
5. Talk to council or a planner – Once you know the constraints, a pre-lodgement chat with council or advice from a town planner tells you how they are likely to be applied.

Or let Jeanie do the legwork: a free address search shows your zoning and planning controls in seconds, and an Investigation report pulls your title documents and flags easements, covenants, heritage and other constraints in plain English for $199.

Frequently Asked Questions

How do I find out what I can build on my block?

Check five things: your zoning, any overlays or hazard mapping, your lot size and frontage against council minimums, your title documents for easements and covenants, and your council's local planning controls. Zoning and overlays are free to check through state planning portals. Title constraints require a title search.

Does zoning alone tell me what I can build?

No. Zoning tells you what is permitted in principle. Overlays, lot dimensions, heritage controls and title constraints can all restrict or rule out development the zone would otherwise allow. Many blocks that look developable on a zoning map fail on a title constraint that only a search reveals.

What can stop me from building on my land?

The usual suspects are restrictive covenants, drainage or sewer easements through the buildable area, heritage listings or conservation areas, flood or bushfire mapping, and insufficient lot size or frontage for the development type. Almost all of these are checkable up front, before you spend money on design.

Are the rules the same in NSW, Victoria and Queensland?

No. Each state has its own planning system: LEPs and SEPPs in NSW, planning schemes with zones and overlays in Victoria, and council planning schemes in Queensland. The underlying concepts are similar but the names, maps and approval pathways differ, so check the sources for your state.

How much does it cost to check what I can build?

Zoning and overlay maps are free through state planning portals and council mapping. Title searches and registered instruments are ordered for a fee through each state's land registry. Jeanie's address search is free and shows zoning and planning controls; the Investigation report, which pulls your title documents and explains the constraints in plain English, is $199.