Development Site Acquisition in Australia: A Buyer's Guide

Development sites are bought on potential. The price a buyer can justify depends on what the planning scheme allows on the land, what it costs to build, and what the finished product will sell or lease for. None of those numbers exist at the point of purchase. They have to be modelled, tested and defended, and most of the risk in a development purchase sits in the gap between the model and the outcome.

That makes site acquisition a different discipline to buying a leased investment. This guide covers the physical fundamentals that decide whether a site works, the planning risk that hangs over every application, the feasibility discipline that keeps a purchase rational, and the contract structures that let a buyer carry approval risk on sensible terms.

The Physical Fundamentals

Two sites with the same zoning and the same area can support very different projects. The difference usually comes down to a handful of physical attributes that are cheap to check early and expensive to discover late.

Frontage and access

Frontage width sets the access geometry for the whole project. A basement ramp needs room to turn, a loading dock needs a swept path that works for the vehicles the end user will run, and a childcare or medical use needs safe drop-off. A narrow frontage can make an otherwise compliant apartment scheme unworkable because the ramp and the entry lobby cannot both fit. Corner sites offer two frontages and more flexible access, though they often carry corner truncation requirements and sight-line controls. Sites fronting state-controlled roads can face restrictions on new crossovers or right-turn movements, and access approval on those roads sits with the state road authority rather than the council.

Services and infrastructure

A main in the street is a starting point. What matters is capacity, connection depth and the cost of augmentation. Sewer and stormwater are the usual constraints. A sewer main crossing the site can impose build-over restrictions that push the building envelope around, and stormwater needs a lawful point of discharge, which on a rear-draining site may mean negotiating a drainage easement with a downstream neighbour. Larger projects can be required to provide an on-site transformer or substation, which consumes developable area. Service authority searches belong early, before the price is locked in.

Orientation and slope

Orientation matters most for residential and mixed-use product, because apartment design codes in several states set minimum solar access standards, and a site with poor northern exposure can lose apartments or absorb design cost to comply. Slope cuts both ways. A gentle cross-fall can allow a basement to open at the low side and save excavation. A steep site multiplies cost through retaining structures, cut and fill, and more complex footings, and it often signals ground conditions that need investigation before a price is agreed.

Shape, easements and title constraints

Regular rectangular sites plan efficiently. Splays, battle-axe handles and acute angles create dead floor area. Easements for drainage, power or access can cut through the middle of an otherwise excellent site and fix the building footprint before an architect draws a line. Covenants and restrictions on user recorded on title can limit use or height entirely apart from the planning scheme.

Planning Controls and DA Risk

The planning scheme sets the theoretical envelope: zoning, permitted uses, height, floor space or plot ratio, setbacks and parking rates. Overlays sit on top of the zoning and often decide the real outcome. Flood, bushfire, heritage, character, biodiversity and airport height overlays can each reduce yield or add conditions, and a site that looks generous under its zoning can be heavily constrained once the overlays are mapped.

Assessment pathways differ by state, and the pathway shapes the risk. Applications assessed against objective codes are faster and more predictable. Applications that involve neighbour notification and merit assessment carry objection risk and longer timeframes, and an appeal adds substantial time and cost even when the applicant ultimately wins.

Buyers can reduce planning risk before contract. A pre-lodgement meeting with the council gives an early read on officer attitude. Written advice from a town planner on the likely envelope is a modest cost against the price of a site. Recent approvals for comparable applications nearby show what the consent authority actually approves in practice.

Approval conditions carry their own risk. A development approval can arrive with infrastructure contributions, land dedications, setback changes or material requirements that reshape the feasibility. An approval on unworkable conditions is still a commercial failure, so the feasibility model should hold an allowance for conditions until they are known.

Run the Feasibility Before You Commit to the Site

Development sites are persuasive. A well-located block with an obvious end use invites optimism, and optimism becomes expensive once it is priced into land. The discipline that protects a buyer is the residual land value method, worked honestly and worked early.

The method runs backwards from the finished project. Start with gross realisation, meaning the total sale value or capitalised rental value of the completed product, supported by current comparable evidence. Deduct construction cost from a builder or quantity surveyor rather than a generic rate, professional fees, infrastructure contributions, finance costs across a realistic program, selling and leasing costs, GST under the treatment that will actually apply, and a development margin appropriate to the risk. What remains is the most the land is worth to the project. If the vendor's price sits above the residual, the difference comes out of margin, and margin is the buffer that absorbs everything else that goes wrong.

Sensitivity testing is the second half of the discipline. Rerun the model with end values softened, construction costs raised and the program extended. A feasibility that only works on best-case inputs is a warning. Funding assumptions deserve the same scrutiny, because construction finance carries presale or prelease requirements and pricing that differ sharply from investment lending. See our guide to commercial construction loans for how lenders assess development funding.

Set the maximum land price from the feasibility before negotiation starts, and hold it. Once a negotiation starts moving the feasibility inputs to justify a higher price, the discipline has already failed.

Options and Delayed Settlement Structures

Approval risk can be allocated through the contract structure, and on development sites the structure is often worth more than the headline price.

Option agreements

A call option gives the buyer the right to purchase within an agreed window at an agreed price, in exchange for an option fee. The buyer lodges the development application during the option period. If the approval lands acceptably, the option is exercised. If it fails or arrives with unworkable conditions, the buyer walks away, and the cost is the option fee plus the consultant spend. Put and call options add a vendor right to require completion and are common where vendors want certainty. Duty treatment of options varies by state and can be triggered earlier than buyers expect, so state-specific advice belongs in the structuring conversation.

Contracts conditional on approval

A contract subject to development approval commits both parties while making completion conditional on an approval by a sunset date. The drafting matters. Define what a satisfactory approval means, including yield thresholds and the condition types the buyer will accept, set a realistic sunset date with extension rights, and be clear about who controls the application and any appeal. A vaguely drafted approval condition creates disputes at exactly the moment the parties' interests diverge.

Delayed settlement

A long settlement is the simplest structure. The buyer exchanges unconditionally but settles many months later, using the period to finalise approvals, documentation and funding so that settlement lands close to construction start. It suits buyers with high confidence in the planning outcome, because the commitment is unconditional from exchange. Vendors price time, so a long settlement usually costs something in the price, and that trade should be modelled like any other feasibility input.

These structures are usually reached through a staged negotiation, and it pays to understand where the binding line sits. Our guide to heads of agreement versus binding contracts covers that boundary.

Holding Income During Approvals

Approvals take time, and the holding costs run regardless: land tax, rates, insurance and interest. A site that produces income while the application runs is materially cheaper to hold, and the benefit compounds if the program extends.

Existing improvements are the usual source. An older dwelling, a shop or an industrial shed can be leased for the approval period. The lease terms need to serve the development program, which usually means short terms, demolition or early termination provisions tied to development milestones, and no options that could outlast the program. Retail tenancies deserve particular care, because retail leases legislation in each state can give tenants protections that sit above the lease document, so take specialist advice before signing a retail holding tenancy.

Licence agreements are the lighter alternative. Hardstand storage, parking and signage licences produce income with simpler termination and less security of tenure for the occupant. On sites with no usable improvements they are often the only realistic holding income available.

Holding arrangements also interact with the tax and GST position of the purchase, so the structure should be settled with the accountant before exchange rather than after.

Due Diligence Specific to Development Sites

Development sites carry the standard commercial due diligence workload plus a physical layer that leased investments rarely need. Our commercial property due diligence guide covers the base program. The development-specific additions are listed below.

• Geotechnical investigation. Rock, groundwater and uncontrolled fill each move excavation and footing costs materially, and none of them are visible from the street.
• Contamination assessment. Former service stations, workshops, dry cleaners and industrial uses leave residues that can trigger remediation obligations. Environmental site assessments run in stages, and the first stage is inexpensive relative to what it can find.
• Survey. An identification survey confirms boundaries and encroachments, and a detail and level survey feeds the design. Encroachments by or on neighbouring structures are far easier to resolve before exchange.
• Services searches. Locations and capacities of water, sewer, stormwater, power and telecommunications, including any authority assets within the site.
• Title searches. Easements, covenants, caveats and restrictions on user, read against the intended scheme rather than the current use.
• Existing structures. Hazardous material surveys before demolition costs are priced, and heritage or character listings checked before demolition is assumed at all.
• Trees. Significant tree protections can constrain the envelope as firmly as a setback control, so get arborist advice early where mature trees stand near the buildable area.

Getting the Sequence Right

The sites that hurt buyers are usually bought in the wrong order: price agreed first, feasibility bent to fit, due diligence compressed at the end. The sequence that protects capital runs the other way.

1. Confirm the planning envelope with a town planner before agreeing a price.
2. Run a preliminary feasibility with honest inputs and set the maximum land price.
3. Negotiate a structure that matches the approval risk, whether an option, a conditional contract or a long settlement.
4. Use the option or conditional period for the intrusive due diligence: geotechnical, contamination, survey and services.
5. Go unconditional only when the feasibility still works with the due diligence findings and any approval conditions priced in.

Followed in that order, the process caps the cost of an unworkable site at consultant fees and an option fee rather than a completed purchase.