Hi, We are looking at doing an extension to our home, we currently have a standard three bedroom house on a 560 m2 block, we are thinking about renovating and adding a spilt level extension of a double garage with open floor plan above making the outline of the house and L shape, so just after a ballpark figure of what this kind of project would cost, any advice welcome.
To help estimate, you will first need to determine the size of your home extension in square meters. With this figure (i.e. 150sqm) you can roughly multiple it by an estimated cost per sqm (i.e. $1500-$3000+ per sqm). Obviously the cost per sqm is dependent on the design, fittings and fixtures you select and if you decide to go owner builder vs an extension company. IMO $1500 per sqm will get you a basic build and the sky is the limit from there.
Joined: 03 May 2009 Posts: 1196 Location: Maroondah Council
After getting quotes for extensions in Melbourne about a year ago, I have to say that $1500per m2 is too low.
Try $2500m2 as a basic fitted out extension. This DOES NOT include any renovation of your existing house.
This was our rough idea with costs.
Add 100m2 to an existing 101m2 house (16yr old at the time) for a single storey or part ground floor part upper addon, including re locate laundry to rear of new building. Add master Bed room with ensuite Add study Add living room. Strip existing Laundry and re model into walk in Pantry(shelving, cupboards, electrical included for pantry, not rest of kitchen)
Includes electrical fitting to new rooms. Includes light, bathroom, kitchen cupboard fitting to match existing (old/tired)
Does not include Floor coverings to non wet areas renovation of existing house (kitchen, bathroom, walls to be moved/removed not required for extension) excavation of land to allow extension (extra $25k with retaining walls) Any provision for a garage.(brick garage to match house was quoted as $48-65k) removal and re install of central heating if adding second storey.
One kicker was that they wouldn't match any new fittings if we decided to replace them with the extension. So if we wanted to update the tap ware, cupboard handles or light fitting they would fit the ones to match the old stuff, then we would have to replace them ALL.
Also we would have needed to move out for at least 3 months of a proposed 9 month build.
Kitchen renovation was priced at an additional $17k plus appliances to change from a "U" shaped to a "L" shape with island bench. No stone included.
Total costs. $238,000 for extension $25,000 excavation and retain $5,000 floor coverings $17,000 kitchen upgrade $6,000 appliances $3,000 remove and re fit heating $x,xxx Rent $2,000 new fitting for bathroom, new door handles through out.
= $296k (no garage remember)
We are about to start our knock down re build this month (house is about to be pulled down in Jan)and the total cost of our new 31sq house including garage for 3 cars is less than the extension price if we got evap cooling instead of refrigerated and opted for a lower grade of appliances (the ones we ot offered were OK but I wanted Bosch ones)
If you can Owner build you'll save money, but you really need to have the spare time to start with.
We started with the Archicentre Cost Guide, and agree that $2500 is probably more realistic. We're planning a renovation and extension on our home in Adelaide (architect finalising plans now for tender). Her cost estimate came in at $230-250K for 64 sqm plus deck, and then a builder estimate came in at $264K - i am really hoping the tenders come in at not much more than this or it will be all over before it begins! It will be pretty $$ per sq m and we aren't doing much to the existing house (making current laundry a 2nd bathroom), area which is currently kitchen will be hallway and built in study. Then we need to re-roof, do a carport and landscaping... plus the fees (about 10% of the build)... sometimes I think we are nuts.
But out house is double-brick, inner city, stone fronted, character features, so knocking it down isn't an option for us. We might lose say $50-80K if we were to sell it straight away (which we don't plan to). I think you need to look at how much it's currently worth, work out what the end product would sell for and work out how much you can spend per sq m etc.
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