Small Developer Feasibility Checklist for NSW

A corner block, a wide frontage or an ageing house can make a property look like a straightforward development opportunity. The numbers can change quickly once planning controls, site constraints and approval requirements are tested. This small developer feasibility checklist is designed for NSW investors and developers who want to assess a site before they commit to a purchase or spend heavily on detailed design.

Feasibility is not just about fitting the maximum number of dwellings onto a block. A worthwhile project needs a compliant design pathway, sensible construction costs, market demand and enough margin to absorb the issues that inevitably arise between purchase and completion.

Why early feasibility protects your budget

Small developments commonly fail at the assumptions stage. A buyer may allow for a duplex because nearby properties have one, only to find the zoning, minimum lot size, heritage controls or vehicle access requirements make that outcome unlikely. Another site may support the intended yield but require retaining walls, stormwater detention, demolition or service upgrades that materially affect the budget.

The aim is not to rule out every risk before purchase. That is rarely possible. It is to identify the risks that could change the project from viable to marginal, then price them properly or walk away with confidence.

For duplexes, townhouses, granny flats and small commercial projects, this early work should be based on the specific council area and the current planning controls. Rules vary across Sydney, the Central Coast and Newcastle, and a result achieved on one street is not a guarantee for the next site.

Small developer feasibility checklist: the key tests

1. Confirm the planning controls before estimating yield

Start with the site’s zoning and the uses permitted with consent. Then review the applicable Local Environmental Plan and Development Control Plan for minimum lot size, floor space ratio, height, setbacks, landscaped area, private open space and parking requirements.

Do not rely solely on an online planning map or a real estate listing. Maps are useful for an initial filter, but they do not explain every site-specific control. Heritage items, heritage conservation areas, flood planning, bushfire-prone land, acid sulfate soils, biodiversity constraints and airport-related controls can all affect design, cost and approval timeframes.

For a subdivision, check whether the existing lot can be subdivided as proposed and whether each resulting lot can meet the relevant standards. For dual occupancies and attached dwellings, confirm the definition of the development type. Terms such as duplex, dual occupancy and multi dwelling housing may be used differently under planning instruments, and the distinction matters.

2. Check the physical shape of the site, not just its area

Two 600-square-metre blocks can produce very different outcomes. Frontage width, depth, slope, orientation, easements and the location of existing services often matter more than the headline land size.

A narrow site may struggle to provide a compliant driveway, garages, turning areas and usable landscaping. A sloping block can require excavation, retaining walls and carefully considered drainage. An easement through the rear of the site may limit where buildings, pools, driveways or stormwater systems can go.

Inspect the site and the surrounding streetscape. Look at kerb crossings, power poles, street trees, neighbouring windows, overlooking, mature vegetation and likely construction access. These issues do not automatically stop a project, but they should be reflected in the concept and the cost plan from the beginning.

3. Test a realistic design yield

A quick feasibility should be based on a workable sketch, not a maximum theoretical floor plan. Allow for circulation, wall thicknesses, stairs, storage, bins, mailboxes, services, private open space and setbacks. These elements consume space and are often where over-optimistic yield assumptions fall apart.

For residential projects, ask whether the homes will be practical for the intended buyer or tenant. A three-bedroom townhouse with compromised living space, poor solar access and difficult parking may meet a minimum numerical standard but still perform poorly in the market.

The best yield is not always the highest dwelling count. Sometimes one well-designed duplex, or a home with a secondary dwelling where permitted, provides a clearer approval pathway and a stronger return than forcing additional dwellings onto a constrained site.

4. Identify the likely approval pathway

Establish early whether the proposal may be suitable for a Complying Development Certificate or whether it will require a Council Development Application. A CDC can be efficient where a proposal meets the relevant code, but the standards are prescriptive. Site constraints, variations or design ambitions can move a project into the DA pathway.

A DA gives more scope to respond to a site, but it also requires a considered planning case and sufficient documentation. Council may seek reports relating to stormwater, traffic, arboriculture, bushfire, flooding, contamination, acoustics or heritage. The required consultant team depends on the site and development, not simply its size.

It is also worth checking whether the site has a history of approvals, refusals or unresolved compliance matters. Previous applications can reveal issues that are not immediately visible in a planning map.

5. Build a full development cost allowance

Construction is only one line in the feasibility. Include acquisition costs, stamp duty, legal fees, finance, demolition, design and documentation, consultants, approvals, authority fees, contributions, service connections, landscaping, driveways, external works, contingency, marketing and selling costs where relevant.

Allow for the time value of money. A project delayed by a lengthy approval process, redesign or unexpected site condition can incur additional holding costs and interest. If the margin only works when every approval and construction assumption is favourable, the project is carrying too much risk.

Obtain early guidance from a builder or quantity surveyor where the project warrants it. Concept-level cost plans are not fixed quotes, but they are far more useful than applying a generic per-square-metre rate to a complex or sloping site.

6. Assess services, drainage and construction access

Stormwater is a frequent feasibility issue in established suburbs. Check the likely legal point of discharge, existing drainage infrastructure and whether on-site detention or other measures may be required. A site without a simple drainage solution can involve significant design work and cost.

Review sewer, water, electricity and telecommunications locations as early as possible. Relocating infrastructure, upgrading connections or working around a sewer main can affect the building footprint and programme. On tight infill sites, construction access, material storage and crane or concrete truck access should also be considered before finalising the purchase price.

7. Check the market case, not just comparable sales

Comparable sales provide a starting point, but feasibility needs a realistic view of what buyers want in that location. Consider dwelling size, parking, bedroom mix, home office space, outdoor areas and the standard of finish expected by the market.

For a hold-and-rent strategy, test achievable rent, vacancy risk, management costs and ongoing maintenance. For a sell-down project, allow for changing market conditions and do not assume the strongest sale in the suburb is the benchmark for every new dwelling.

Put the figures under pressure

Once the planning, site and market assumptions are assembled, run more than one scenario. Test a base case, then test higher construction costs, lower sale prices or rents, a longer approval period and additional site works. This is where a project’s real resilience becomes clear.

A healthy feasibility has room for uncertainty. The appropriate margin depends on the project type, the buyer’s experience, finance structure and level of site risk. An experienced developer with a straightforward infill site may accept a different return to a first-time developer buying a steep, flood-affected block with a complicated DA pathway. The point is to make that decision knowingly.

When a site deserves further design work

If the initial assessment supports the proposed outcome, the next step is a site-responsive concept design. This should show a credible arrangement of buildings, access, parking, open space and setbacks, while identifying the reports and documentation likely to be needed for approval.

GAP Designers regularly assists clients with early concept planning and approval-focused design for small NSW development sites. The value of this work is not simply producing attractive plans. It is identifying a practical pathway that responds to council controls, site conditions and the commercial objective behind the project.

A property does not need to be perfect to be viable. It does, however, need a clear path from site purchase to approval, construction and a marketable end result. Testing that path before you commit gives you a far stronger basis for the decisions that follow.