People are astonished at how the builders costs soar when building on a restricted site!
A restricted site is generally when a the building takes up most of the block. Generally this means that there is little room to store materials and special techniques may be needed to construct the house.
Generally if you are on a new subdivision you should be able to avoid restricted site costs but if you are looking to build in an existing suburb, particularly something like a Battle Axe block, then there is a good chance that you will be hit with the extra charge.
Here are some of the reasons why it can costs extra:
Double Handling, If all there is limited space for storage on site the builder may have to store some of the materials at his own yard. He then has the additional cost of reloading the material onto his truck and delivering to site.
Smaller Deliveries. When you buy building materials the charge is normally based on the cost of the materials and the cost of delivery. If you need 2 or more smaller deliveries rather than 1 the cost is going to go up.
Different Construction Machinery. In some cases the contractor may have to use smaller, less efficient, excavators. For really restricted sites it may need a much larger crane, parked in the road (which can mean traffic management costs) to position heavy items, like roof trusses.
Difficult Construction This can mean more hand work or dealing with building a wall on a boundary with limited access, and having to support foundations of neighbouring buildings.
Parking Fees Sound insignificant, but if its going to cost the tradies $5/day each when they normally park for free so they are going to want be charging that to your job.
See Blocks for more information on buying land