Hi Boyler room
I don't consider myself a property developer yet but I'll tell what I know.
What you are considering in getting yourself into is the most complicated, risky and stressful aspect of property, but by far the most rewarding. This is where the BIG BUCKS are.
If I am considering a development I don't see why u shouln't at least double your money. That is if the site + building cost are 3M then your resales should be 6M. You may think that is impossible but it's not. It just depends on how much u buy the site for. That's the most important thing.
Firstly you must become an expert in the area you are looking to develop and I don't just mean rental yields and property values. You should go to your local council and buy the DCP(development control plan) and the LEP of that area and read it carefully. They usually come in a folder and cost about $100.
U need to know the following to say the least
1. Zoning : does it allow multiunit development
2. Minimum site area and frontage for multiunit development
3. FSR (floor space ratio)
4. Height limit
5.% of site coverage
6.open space requiremnts
7.access and parking requirements per unit
8.% of mix between 1, 2,3 br units
etc etc
Once u are familiar with all these and more then u can pretty easily look at a site and roughly work out what u can put on it. Then you have to consider construction costs. I consider them at roughly $1500 per square metre.
This is where u may consider the advise of an architect if you are really serious of buying a raw site that hasn't already got a DA.
So say u buy a site for 1M and u can put 20 units on it. That comes to 50K per site. At $1500 psm an average 2br unit of 80sqm comes to 120K. That's 170K per unit. Can u get 300 to 340K for that unit finished ?
Once you are happy with your site and you have confirmed everything with council your architect and possibly a builder then put an offer in subject to council approval. You can ever try offering an option to buy, that means giving 5,10,20K depending on the size of the development non refundable to the vendor for a 12 month period. Then lodge with council and if everything goes well settle after 12 months. If this doesn't work because most vendors don't like it then try and get at least a 6 month extended settlement with the ability to lodge plans into council during the settlement period. Usually that's possible on a development site.
Once u exchanged contracts immediately get cracking with your achitect to get the plans ready and lodge with council. You have to first get your DA and CC (construction certificate) before you can start building. In the interim also start getting your building quotes. That can take a while so get cracking.
It gets complicated but if u want to BE BIG u have to THINK BIG.
Regards