The biggest time-waster in land subdivision is researching sites that were never going to work. People spend days, sometimes weeks, looking into a property before discovering a fatal flaw that was visible in five minutes if they'd known where to look.
After 30+ projects, I've distilled everything I check into 12 filters. These are the things that determine whether a site has genuine subdivision potential or whether you're wasting your time. Run through them in order. If a site fails any one, move on. No exceptions.
Why you need a checklist
When you first start looking at sites, everything seems like it could work. A big backyard, a corner block, a wide frontage. Your brain starts imagining possibilities before your numbers confirm whether they're real.
A checklist stops that. It forces you to be systematic rather than emotional. It means you spend five minutes filtering a site rather than five days. And it means you only invest real time and money (planner fees, surveyor quotes) into sites that have already passed every basic test.
"I never spend more than five minutes on a site before I know whether it passes or fails these filters. That discipline is what allows you to screen dozens of sites in a single session and only invest real time in the ones with genuine potential."
The 12 filters
Zoning permits subdivision
This is the first and most important check. Open the council's online mapping tool and confirm the site is in a residential zone that permits subdivision. If the zoning doesn't allow it, nothing else matters. Don't assume. Check.
Site area exceeds the minimum lot size threshold
Check the planning scheme for the minimum lot size in that zone. The site needs to be large enough to create two or more lots that each meet the minimum. A good rule of thumb: the site should be at least 2.5 times the minimum lot size to account for driveways, setbacks, and the small losses that come from splitting.
Frontage is sufficient
Many councils require a minimum frontage for each new lot, typically 9 to 15 metres. If the site doesn't have enough frontage to give each lot adequate street access, you may be forced into a battleaxe configuration, which adds cost and reduces the value of the rear lot. Measure the frontage on the council mapping tool before you go further.
No deal-killing overlays
Toggle the overlay layers on the council's mapping tool. Check for flood, bushfire, heritage, and vegetation overlays. An overlay doesn't always kill a deal, but it always adds cost and complexity. If the site has a significant overlay (particularly flood or heritage), factor in the extra time and money before proceeding.
Slope is manageable
Flat to gently sloping is ideal. Steep sites mean expensive civil works, retaining walls, and complex stormwater management. You can check slope roughly using Google Earth's terrain view or the council's contour data. If the site has more than a 3 to 4 metre fall across its length, budget for significant additional civil costs.
Services are available in the street
Every new lot needs water, sewer, stormwater, power, and telecommunications. If these services already run past the front of the property, connection costs are predictable ($12,000 to $30,000 per lot). If they don't, extension costs can blow your feasibility apart. A phone call to the council's engineering department confirms this quickly.
Want the full site search process?
Our cornerstone guide walks you through how to find subdivision sites systematically using free council mapping tools, state by state.
Read: How to Find Subdivision Sites →Access is straightforward
Can each new lot be accessed directly from the street? Or will one lot need a driveway through the other (battleaxe)? Direct street access for every lot is the ideal scenario. Battleaxe lots are worth less and cost more to service. Check whether the site shape and frontage allow direct access for all proposed lots.
No easements through the development area
Check the title for easements. Sewer easements, drainage easements, and access easements can restrict where you place lot boundaries, driveways, and buildings. A sewer easement running through the middle of the site can make a subdivision unworkable or require expensive relocation. Title searches are $20 to $50 depending on your state.
Existing dwelling is manageable
Most subdivision sites have a house on them already. That's fine. The question is whether the existing house is positioned in a way that allows the new lot(s) to be created without demolishing it. If demolition is required, add $15,000 to $40,000 to your feasibility. If the existing house can stay, your costs and risk are lower.
No significant trees in the development footprint
Many councils have tree protection policies. Significant or protected trees on the site can prevent development in certain areas, require expensive arborist reports, or trigger offset planting conditions. Check for large trees on the aerial photo and confirm the council's tree protection policies before proceeding.
Comparable lot sales support the numbers
Check what similar-sized lots have sold for in the same suburb recently. Use realestate.com.au's "sold" filter. If there are no comparable sales of subdivided lots, you have a valuation problem. You need at least three recent comparable sales to build a reliable Gross Realisation Value for your feasibility.
Back-of-envelope feasibility shows 30%+ margin
Run the quick calculation. Estimated sale value of all new lots, minus purchase price, minus estimated subdivision costs. Divide the profit by total costs. If it's not at least 30%, the site doesn't make the cut. For details on how to run this calculation, read our guide on The 30% Margin Rule.
How to use this in practice
The power of this checklist is speed. You should be able to run through all 12 filters on a single site in under five minutes using nothing more than a council mapping tool, a title search, and realestate.com.au.
When you're actively searching, you might screen 20 to 30 sites in a single session. Most will fail at filter 1 (wrong zoning), 2 (too small), or 4 (overlays). A handful will make it through to filter 11 and 12. Those are the ones you invest real time in.
Keep a simple spreadsheet with one row per site. Record which filters it passed and failed. Over time, you'll develop an intuition for what works in your target suburb, but the checklist keeps you honest even when your gut is telling you a site "feels right."
Print this checklist or save it on your phone. When you're driving through suburbs or browsing realestate.com.au listings, run the filters mentally. It trains your eye to spot subdivision potential faster, and more importantly, to dismiss sites that won't work before you waste any time on them.
What comes next
This checklist tells you whether a site is worth investigating. It doesn't tell you whether to buy it. For that, you need deeper due diligence: a preliminary conversation with a town planner, a surveyor's assessment, and a detailed feasibility calculation.
If you want to learn how to find sites to run this checklist on, read our guide on How to Find Subdivision Sites Using Free Online Tools.
If you want to understand the feasibility calculation in detail, read The 30% Margin Rule.
And if you want to know whether you're ready to start looking at sites right now, take our free readiness quiz.
