Site Establishment Costs in AU Residential Building

What it is

Site establishment is the cost of setting the site up so trades can do the work safely and legally. It is part of the preliminaries section of a residential building budget and covers the temporary facilities, services and protective measures that have to be on the ground before any meaningful building work starts.

In AU residential work site establishment typically sits inside Preliminaries on the Schedule of Materials (SOM) or Scope of Works. It is one of the cost lines that owners often do not see when they compare two builders quotes and one of the lines where corners get cut on tight margins.

What it includes

A residential site establishment scope usually covers six things.

Site shed or office

A lockable site shed or container provides a place for drawings, the site safety folder, lunch breaks in bad weather and lock-up storage. Small jobs may skip the shed. Larger custom homes and any job over six months usually budget for one.

Toilets

Temporary toilets are mandatory under the Work Health and Safety Regulations in every Australian state. The minimum requirement under the Safe Work Australia model Code of Practice and the state-equivalent codes is one toilet per workplace. For a workforce of more than 10 the requirement scales with headcount. Hire of a portable construction toilet typically runs in the range of $150 to $300 per month with weekly servicing in capital cities.

Site fencing

Temporary site fencing 1.8 metres high or higher is required to secure the site, exclude the public and meet WHS obligations on hazardous work areas. Hire of temporary fence panels typically sits in the range of $50 to $150 per lineal metre for the duration of the build, with the wide range driven by location, mesh versus solid panels and whether the fence includes shade cloth or branded scrim.

Temporary power

Most residential sites need a temporary power pole or builder's pole installed and connected before slab pour. The pole is supplied by a licensed electrician and connected by the local network operator. Allow roughly $1,500 to $3,500 for supply, install, network connection and disconnection at end of build, with NSW and VIC at the lower end and remote sites significantly higher.

Temporary water

A site water connection or standpipe lets the builder run hoses for slab curing, cleaning and trade use. In most metropolitan areas a builder's water meter is installed by the water authority for the duration of the works. Sydney Water, SA Water and similar agencies charge install fees plus metered consumption.

Safety signage

Mandatory signage includes the principal contractor sign (where the project exceeds the state threshold for principal contractor obligations), site entry warning signs, PPE requirement signs and the WHS regulator emergency contact sign. Allowance of $50 to $300 covers a standard signage pack for a residential site.

Site establishment as a percentage of contract value

Preliminaries (which include site establishment plus supervision and overhead allocated to the job) typically run between 5 and 15 percent of total residential construction cost based on industry benchmarks. Site establishment on its own usually sits at the lower end of that range, in the order of 2 to 5 percent of the contract value for a typical metropolitan project.

A small renovation under $300,000 might carry $8,000 to $15,000 of site establishment.

A standard custom home in the $800,000 to $1.5 million range often carries $20,000 to $40,000 across all of the items above plus signage and any neighbour protection.

Large or sloping sites, restricted access infill sites and rural projects can push site establishment to 7 or 8 percent of contract value when crane pads, longer fencing runs, generator power or trucked water are needed.

SOM and preliminaries treatment

In a properly drawn AU residential SOM the site establishment items live in the Preliminaries section near the front of the document. Best practice is to itemise each component with a quantity and an allowance amount so the owner can see what is included.

The clean version of the SOM line items reads:

• Site shed or container: hire and delivery
• Portable toilet: hire including weekly service
• Temporary fencing: lineal metre allowance and duration
• Temporary power: builders pole supply, install, connection, disconnection
• Temporary water: meter install and consumption allowance
• Safety signage: PCBU signage pack and ongoing maintenance
• Waste removal: skip rotation across the program
• Neighbour protection: scaffolding hoarding or shade cloth where required by adjoining boundary

Treating these as a single Site Establishment lump sum is common but harder to defend if the owner queries the cost or if the program extends and the line needs to be increased through variation.

What changes the cost

Three site conditions move site establishment cost the most.

Programme length. Every item priced as a monthly hire scales with build duration. A 12 month custom home costs roughly double what a 6 month identical scope would in fencing, toilets, sheds and waste.

Site access. A site at the end of a long driveway, with no street frontage or with neighbour easements may need additional fencing runs, longer power leads, harder access for service trucks and security lighting that a standard battle-axe block does not.

Council and authority requirements. Some councils require specific hoarding designs over public footpaths, neighbour protection for trees subject to a Tree Preservation Order, or specific signage on traffic-controlled roads. These local rules can add several thousand dollars per project and need to be checked against the development consent before the contract is signed.

Where it goes wrong

Builders most often under-allow site establishment by pricing for a six month job that runs to nine, by missing the temporary water meter cost, or by leaving signage off the SOM entirely and then absorbing it. Owners most often query site establishment when the build runs long and the monthly hire allowances tick over their original contract value. A clean SOM with monthly rates per item and a stated duration is the cleanest way to handle both problems.