It sounds simple but I can assure you that if you want other than a bog-standard box it is not. House and land packages/turnkey deals are the easiest but my chosen builder didn't have anything on offer so I chose my section and then chose my builder based on the fact they were the only ones with a plan that resembled something I might like.
Why I liked their plan:
There was natural light coming directly into the kitchen and I could stand at my sink and look out on my garden. These days the trend is to put the kitchen in the middle of the house with no natural light, only whatever light would come in from the dining or living areas. In short, you need to use electricity to light your kitchen any time you want to work in it, they are so dark. Not very sustainable in my opinion. I live in a duplex currently which is exactly like that. It's consequently dark and cold to live in.
After careful thought I felt the current plan used up too much of the section on driveway, robbing me of garden space. This single aspect meant we had to work out how to reorganise the garage, the entranceway and the bnb. Driveways are scarily expensive folks. Keep them minimal, especially if you want tinted exposed aggregate to look a bit classier and to eliminate the horrendous glare from raw, white concrete.
OK, you've got your layout pretty much sorted so your builder provides a rendering of what it might look like. Exciting! They should show you how the house is positioned on the site to profit from the sun. Do you want most spare land in front on the street or, like me you prefer your space to be private around the back? Your site layout should show any easments, boundaries. distance to road and neighbours, recession planes because your council will need to be happy with your choices. See, it's not just about you.
Next your builder will draft a sales proposal consisting of basic specifications for the house and a total cost. I wanted a fixed price. OK except that in reality it's not, really. So many things are NOT included such as driveways letterbox, fences. landscaping, sometimes spashbacks, logfire surrounds and hearths, curtains. Sometimes your builder will decide to change the specs because they can't build the house for your budget. This is disappointing and results in uncomfortable but necessary negotiations as you make trade-offs. I sacrificed the security system and doorbell so I could have 2.2m internal doors to match my 2.7m stud. That extra height makes a big difference in the whole feel of my home.
You get the Sales Proposal and they should also send you a blank copy of the contract and the Residential Building Guide support documents. I had my lawyer check this even though it was a standard Masterbuild contract. Your builder MUST supply these documents in advance of you signing.
Your builder should also apply for a Project Information Memorandum from the council to see what the state of the section is for building on. Geo reports are not enough, even if supplied free by your developer. Your section might need special testing even though the council knows the foundation category. In my case the equivalent of TC1.
Note: talk to others who have built. Listen to their horror stories and learn from them, pick yourself up off the floor and keep going.
Next post: signing the contract and what you need to do while you are waiting to start building.