A Simplified Explanation Of Site & Earth Works Part 2

Site & Earth works - cut to fill average levels

What are site works or – earth works, an even more simplified explanation

In this post, the second in the series of, A simplified explanation of site & earth works, we will provide an even more simplified explanation of the process and items that you may encounter.

Generally when you have been provided a quote to build your new home, the costs for site works or earthworks are not included in the cost to build your home. They may be added as provisional sums (PS) or prime costs (PC) and generally don’t form part of the structure, (building of the home) itself.

The type of things that may be included in site & earth works and included as provisional sums  for for building blocks in Perth are:

Re-peg of the site

A repeg, is a survey of your block after the earthworks have been completed and before the concretors and plumbers start digging to form up the footings and prelay the plumbing pipework. A repeg ensures that your boundary pegs are in the correct position after siteworks, as sometimes the machinery can knock or move them.

It is critical to ensure your home is set out and built in the correct position on your block. It’s even more critical if the home is being built on one or more boundaries.

Once the surveyor has completed the survey, he will send the Builder a copy of the repeg certificate for his records.


This is when the earthmoving equipment comes to site and starts preparing your block for the preparation for the ground slab to be laid. Earthworks can include some or all the following:

Scraping and removing overburden

  • The earth worker will use his machinery to scrape, generally with a rake attachment on his machine and remove any grasses and small shrubbery that is on the lot.

Turn over the soil to remove debris,

  • The earth worker will turn over the soil and remove and debris including any rubble or green waste to make sure there are no tree roots or rocks left in the soil

Cut and fill the site to the average level,

  • this generally means not having to bring in sand, the earth worker will cut the soil from one area and place it in another and then level the lot to an average level across the building envelope (the area where the house is to be built)

Possibly import sand fill if required,

  • if a sand pad is required, and there is not enough soil on the block already from a cut to fill, then sand will need to be brought in and levelled across the building area to create a raised sand pad.

Compact and arrange a compaction certificate,

  • The earth worker will compact the sand pad and an engineer will come to site and certify that the sand pad has been compacted and provide the earth worker with a compaction certificate that is then forwarded to the Builder for his records.