Sep 21, 2019 10:18 am
this is my first time of a forum, I'm just after some general info about house extensions.
I know there's probably no such thing as general info as there's so many variables to consider when building but i just want to get some sort of rough info.
If im looking at extending my house say 30m length x 15m width ish straight forward gable roof,colorbond, no valleys, obviously it will be attached to our existing house, on stumps not concrete, either blue board or foam exterior as it will be rendered, literally just the external shell completed to lock up, no plumbing, elec, plaster, just the external shell
what sort of cost would we be looking at??
im not sure what pitch my existing roof is, im not sure if this will have some bearing on the cost?
timber or steel frame? most likely timber.
im aware its not as simple as it seems, im just after a rough cost, i understand different types of windows are more expensive than others, im defiantly not a builder hence why im asking the very broad question.
thanks in advance
Re: house extension2
Sep 22, 2019 8:51 am
Mchalkie welcome to the forum
Based on the information you have provided
Extending 30m x 15m =450m2 at $800m2 to $1200m2 = $360K to $540K
To get a more accurate preliminary estimate it is best to use a 3D Bim Model, extract the approx quants/data for materials
ie, m, m2,m3,etc and apply realistic rates and costs to build from the internet Via google, if you require more dynamic data email appsb4Ubuild you will require a gmail a/c as well
Here is an example using the 2 methods
1. M2 rate 96m2 x $1200/m2 +90m2 x $800/m2 = $187K + demo
2. 3D Bim method here
Extension Data and Costs = $195K + Demo
Method 2. above allows you to break down the components and compare
various build scenarios ie DIY, DI4me, DIL8er,etc
Method 1. Makes a lot of assumptions, some times it works other times it does not, it lacks informative data
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