The 10 Questions to Ask Before Buying a Subdivision Site.

Not "is it zoned residential". What is the minimum lot size under the LEP, and how many compliant lots does the geometry genuinely produce after roads, drainage and any dedications? A 1-hectare R2 site with a 450sqm minimum lot size does not yield 22 lots. After subdivision works it might yield 16. Run the yield with a surveyor or civil designer, not a calculator. Yield error is the most common and most expensive diligence failure, because every other number in the feasibility multiplies it.

Sewer and water availability make or break subdivision economics. The question is not whether mains exist nearby but whether they have capacity, at what depth and invert level they sit relative to your site, and what the authority will require to connect, whether extensions, amplifications or pump stations. Confirm with Sydney Water or the local water authority and your civil engineer, not the cadastral map. Power matters equally. An upstream substation constraint or required pillar relocations can add six figures and months.

Flood planning area, bushfire prone land, and biodiversity values mapping each carry direct design and cost consequences: filling and floor level requirements, asset protection zones that consume lot area, or a Biodiversity Development Assessment Report with offset credit obligations that can run to hundreds of thousands of dollars. All three layers are public mapping. Check them in the first half hour, because any one of them can reshape the yield from question one.

Grouped mature trees are a double threat. Ecologically they can trigger assessment and offset obligations. Geotechnically, their root systems and removal can drive a Class P (problem site) classification across affected lots, which flows directly into dearer footing designs for every future dwelling and can put the geotech report into direct conflict with the arborist and ecology reports during the DA. On a live Blackark subdivision, reconciling that three-way conflict became a critical-path activity. Walk the site with the trees in mind, and brief the geotech and arborist together.

Demolished sheds, market gardens, orchards, dip sites and uncontrolled fill all leave residues. NSW due diligence convention is a staged environmental assessment: a Phase 1 desktop and walkover, escalating to a Detailed Site Investigation with sampling if indicators appear. Asbestos fragments in surface soils are a recurring finding on older semi-rural holdings, including outside the footprints of former structures. Found early, contamination is a priced remediation line. Found late, it is a stopped project and a renegotiation you have no leverage for.

Easements (drainage, transmission, rights of carriageway), restrictive covenants, and positive covenants can sterilise parts of a site or dictate where roads and lots cannot go. An 88B instrument from a previous subdivision can contain restrictions nobody mentioned. Have your solicitor produce a full title search with all registered dealings before exchange, and overlay every easement on the concept plan. A drainage easement through the middle of your best lots is not a detail.

Pull the council’s contributions plan for the precinct and apply the current rates, indexed April 2026, to your net additional lots. Then add the Housing and Productivity Contribution at $12,974.62 per additional residential lot if you are in an HPC region. Growth corridor totals routinely reach $90,000-plus per lot. Check whether existing lot and dwelling credits apply. This number is public and exact, so there is no excuse for discovering it after settlement.

Gross revenue is not just price, it is absorption. How many lots per month does this precinct settle, at what price points, and to whom: builders, owner-occupiers, investors? Check recent registered sales and time-on-market for finished lots in the immediate corridor, not asking prices. A 30-lot project into a precinct absorbing four lots a quarter carries two extra years of finance and holding cost that a thin feasibility will never show.

Subdivision means a DA, and DA experience varies sharply by council. What are this council’s current determination times against the incoming 95-day target? Is a pre-lodgement meeting available and useful? Are there known pressure points like biodiversity referrals, traffic or drainage standards? A conversation with a planner who lodges in that LGA weekly is worth more than any portal statistic, and it directly shapes your holding cost assumption.

The last question is the only one with a number for an answer. Run the full model: GRV from real comparables, every cost at current rates, target return applied, Residual Land Value out the bottom. Then comes the hard part, which is treating the RLV as binding. The common failure is doing the work, seeing the RLV land below the asking price, and buying anyway because the site is "strategic". The model exists to protect you from that sentence.