Triplex Development – Contour Survey

One of the first things you should arrange prior to designing the buildings on the block is a contour survey of the land, a contour survey provides information on the elevation of the land and also situations of sewerage, water and power connections as well as positions of existing fences and trees.

Generally, a builder will arrange for a contour survey prior to providing a building design, I found the most benefit of arranging the contour survey myself was the home builders took me more serious, after all a contour survey is a one-thousand dollar investment.

I arranged my contour survey with Cottage Engineering, a Perth based surveyor company. It cost me $975 which also included $180 for Australian Height Datum (AHD). AHD is an elevation standard which assumes a zero metre elevation is at the average mean sea level. One of the builders informed me it wasn’t really necessary and only needed if the land is situated near the ocean.

Cottage Engineering even provided the AutoSketch SKF file, which was handy for the builders.

Contour Survey for Cloverdale PDF

Contour Survey Cloverdale

Triplex Development – Zoning

In the last post I introduced my planned triplex development, I skipped over something, why specifically a triplex development?

This comes down to zoning, zoning is one part of the general council’s land use Planning Scheme, in simple terms, zoning determines the minimum land size a dwelling must reside on.

My land is zoned R20/R40, depending on what specific additional requirements are met for each.

Lets use R40, as this allows for more dwellings, to calculate the minimum land size;

1hector /40 = 10000m2/40 =  250m2

Therefore, each dwelling needs to sit on a minimum 250m2 of land.

My land is 911m2, so to determine the number of dwellings;

911/250 = 3.644 dwellings

hence a triplex development.

Triplex Development – Introduction

A few years ago together with the misses, we bought an old house sitting on a decent parcel of land, enough to build three houses when the time came. You can further read about the purchase on our joint blog, “Buying a house and making a home”.

Well the time has now come to start developing, as a first time developer and builder, there will be a lot of learning and experiences which I will document and share, and hopefully it will be useful for others in the same situation.

Some information on the land;

  • 3×1 double brick house
  • Land area 911 metres squared
  • Approximately 18 x 50.3 metres
  • Zoned R20/R40
  • Purchased for $500k

Cloverdale lot diagram and zoning