What Are Site Works?
The site works is all the work required to prepare the site and allow them to build that standard house.
The following are frequently encountered additional costs:
Levelling the ‘Construction Pad’
The standard project house is designed for a perfectly flat site, however most sites have some sort of Slope.
Depending on the slope the cost may range from $1,000 to in excess of $20,000
Building Retaining Walls
This is another consequence of a sloping site.
Although a level construction pad may have been constructed action to stop the construction pad sliding down the slope, or the block above sliding onto your block, is needed.
With space bieng at a premium the normal solution is a Retaining Wall
If the required wall is higher than 1m the wall will require a site specific engineering design.
Starting cost for a low retaining wall will be in the region of $250/sq metre.
Building Stronger Foundations.
The standard project home is designed to be built on ground that has a Soil Classification ‘M’.
In practice this is very rare.
Even if the underlying material is Class M most modern developments have been levelled to some extentn resulting in there being fill material.
Getting that flat construction pad can also require additional fill
If you are building on rock Rock there will be extensive costs for both levelling the pad and constructiong trenches.
Enev if there is no obvious rock builders will typically include a Provisional Sum of $2,000 – $3,000 for removing any large boulders found during excavations
I think that all Australian houses should have Termite protection even though some areas are considered termite free.
The cost will depend on your prefered solution but can range from a nominal amount, to up to around $2,000.
Bush Fire Protection
Bush Fire protection will depend on the risk level of your block.
Even a fairly low Bush Fire Attack Level (BAL) of 12.5 will require upgrades in the $5,000 – $10,000 range.
Higher risk zones and you could easily get up to $50,000.
Additional Utility Connection Costs
If you have a block that is much larger than 700 sq metres then you could find that the builder will charge for the extra length of service pipes to serve your site.
My last block which was around 1,000 sq metres had an additional $500 cost, larger blocks and the costs will rise substantially.
Generally this will only be required in Knock Down and Rebuild projects.
It can cost in ecxcess of $4,000 to protect your house from one substantial tree.
Minimum Energy Rating Requirements
Australian states require minimum Energy Rating of 6 Stars.
Although the builders designs will meet this requirement in an Ideal Orientation your block might have a far from ideal orientation.
Although the rating can be restored to 6 stars by improving the insulation values the cost be more than $10,000.
You will see from the above that some initial investigation of suitable block will benefit you in avoiding overspending your budget on your new home construction.
If you want to understand more check out the Guide to Buying a Block