Calculating area of house for cost per sqm?

Post by **sometimewoodworker** » October 4, 2015, 9:19 pm

Trying to work out cost per sqm

Our plan is for a house which will be about 216 sqm, with balconies of about 43 sqm,
The roof will cover about 511 sqm

So what is the sqm price based on? Or should we calculate 2 or 3 different Sqm prices

Post by **noosard** » October 5, 2015, 6:24 am

Big difference in roof cover to size of the house
My house price was priced on floor size
The roof over hangs about 1m all the way around

Post by **mickojak** » October 5, 2015, 7:37 am

My house is 253sq/m floor size. ("Mick's house build" on this forum).
My quote just under 12,000p/m, most builders in Udon, (Big Guys) are about 14,000p/m.
There are a lot of variables though.
Depends on how much you want to spend on tiles, doors, bathrooms, taps, lighting, electrical etc.
Can be a bit tricky.

When you get a quote, ask for breakdown of how much they allow you to spend on these items, for that price.
Then go shopping and see if you're happy with that quality or not.
Takes a bit of research
Mick

Post by **sometimewoodworker** » October 5, 2015, 10:38 am

mickojak wrote:My house is 253sq/m floor size. ("Mick's house build" on this forum).
My quote just under 12,000p/m, most builders in Udon, (Big Guys) are about 14,000p/m.
There are a lot of variables though.
Depends on how much you want to spend on tiles, doors, bathrooms, taps, lighting, electrical etc.
Can be a bit tricky.

When you get a quote, ask for breakdown of how much they allow you to spend on these items, for that price.
Then go shopping and see if you're happy with that quality or not.
Takes a bit of research
Mick

I'm not getting an all in quote and realise that there are a large number of variables. Not least the windows which are going to be about 1/5 to 1/4 of the total cost.

My roof overhang is about 2.6 metres and it looks as if the overhang is not usually included.
I'm trying to find out if the usual quote would include the balcony area which adds about 20% to the house size.

I also understand that the large overhang would change the price, but am interested in a usual price.

Post by **mickojak** » October 5, 2015, 12:01 pm

OK,
I negotiated a lesser price for my patio area because to charge the same square metre rate is unfair because it's only a roof, no doors, walls, electrical switches etc.I think 2/3 of other square metre rate is fair.
Something for you to think about.
It took all the builders by surprise because obviously nobody had thought of that before.
Mick

Post by **sometimewoodworker** » October 5, 2015, 2:18 pm

mickojak wrote:OK,
I negotiated a lesser price for my patio area because to charge the same square metre rate is unfair because it's only a roof, no doors, walls, electrical switches etc.I think 2/3 of other square metre rate is fair.
Something for you to think about.
It took all the builders by surprise because obviously nobody had thought of that before.
Mick

Or they were all good actors:)

Post by **fatbob** » October 5, 2015, 6:37 pm

sometimewoodworker wrote: by sometimewoodworker » October 5, 2015, 10:38 am

sometimewoodworker wrote:My roof overhang is about 2.6 metres and it looks as if the overhang is not usually included.
I'm trying to find out if the usual quote would include the balcony area which adds about 20% to the house size.

A 2.6 metre overhang would be considered a balcony, not an overhang!

Post by **rreddin** » October 5, 2015, 7:15 pm

sometimewoodworker wrote:Trying to work out cost per sqm

Our plan is for a house which will be about 216 sqm, with balconies of about 43 sqm,
The roof will cover about 511 sqm

So what is the sqm price based on? Or should we calculate 2 or 3 different Sqm prices

'er indoors is buying our house on mortgage. The house has a floor area of 94 sq m, is single story, of concrete and brick (not block) construction, with aluminium window frames, and concrete roof tiles laid over a steel frame (1 metre overhang). Today, she received the buildings insurance documents, which put the cost of a total rebuild at 940,000 Baht or 10,000 Baht per sq. m. That cost would be inclusive of professional fees.

That at least is somewhere to start from when considering the cost of building the shell of your house.

Post by JR » October 5, 2015, 10:52 pm

Would that include bathroom(s) and kitchen?

Post by **rreddin** » October 6, 2015, 12:46 am

JR wrote:Would that include bathroom(s) and kitchen?

I am not sure, JR, if your question is directed at me. If it is, the answer would be yes to the bathrooms as our two bathrooms are wet rooms, each of which has an electric shower. We have an internal kitchen in which we use electrical kitchen appliances including a kettle, microwave oven, toaster, grill, slow cooker, two halogen cookers, and a rarely used sandwich toaster. We also keep our two fridge/freezers there. It is not, however, a "western style" fitted kitchen with built-in appliances.

We also have an outside Thai style kitchen and utility area of 22 sq. m, which is not included in the floor plan of the house, and would be excluded from the rebuild cost.

Post by **waanjai** » October 6, 2015, 1:48 am

Normally, with Bungalows only the floor m² will count. Everything under the roof proper inside the external walls but without the space under the roof overhangs. And without any external (Thai) kitchen.

Extensive roof overhangs are a plus per se in any combined western-Thai style house in the tropics.

Post by **sometimewoodworker** » October 6, 2015, 4:37 pm

coxo wrote:
sometimewoodworker wrote: by sometimewoodworker » October 5, 2015, 10:38 am
sometimewoodworker wrote:My roof overhang is about 2.6 metres and it looks as if the overhang is not usually included.
I'm trying to find out if the usual quote would include the balcony area which adds about 20% to the house size.

A 2.6 metre overhang would be considered a balcony, not an overhang!

Not really, we have 2 balconies but the roof stops 2.6 metres from the walls.

: Rear view

Post by **fatbob** » October 6, 2015, 6:59 pm

Well your roof members will have to be mighty big for that type of cantilever taking into account wind loads.

Post by **waanjai** » October 6, 2015, 10:32 pm

coxo wrote:Well your roof members will have to be mighty big for that type of cantilever taking into account wind loads.

Again somone who does not know how strong modern structural steel roofs with concrete tiles are. Talk with the experts at e.g. CPAC Monier roofing.

Post by **fatbob** » October 7, 2015, 8:49 am

waanjai wrote: by waanjai » October 6, 2015, 10:32 pm

coxo wrote:
Well your roof members will have to be mighty big for that type of cantilever taking into account wind loads.

Again somone who does not know how strong modern structural steel roofs with concrete tiles are. Talk with the experts at e.g. CPAC Monier roofing.

Are you serious? Who has no idea? A 2.8 met cantilevered roof with no beams or posts, you are a fool! To expect a typical per metre price for a structure that would need correct engineering, do you understand wind loads waanjai, do you understand anything? I think not by your cretinous post.

Post by **Barney** » October 7, 2015, 11:43 am

sometimewoodworker wrote:
coxo wrote:
sometimewoodworker wrote: by sometimewoodworker » October 5, 2015, 10:38 am
sometimewoodworker wrote:My roof overhang is about 2.6 metres and it looks as if the overhang is not usually included.
I'm trying to find out if the usual quote would include the balcony area which adds about 20% to the house size.

A 2.6 metre overhang would be considered a balcony, not an overhang!
Not really, we have 2 balconies but the roof stops 2.6 metres from the walls.
image.jpg

Sometime woodworker are you trying to have the long overhangs utilising no posts to the deck on the roof edge. I tried with my design to have no posts which added to the roof cost and had to include weight bearing larger beams as Coxo has said. My roof was fully engineered by the supplier. 2.6 mtrs is a long span and needs to be fully engineered by whomever to achieve this span. But if you are going to have posts at each corner then the design will still need a beam but of a lessor dimension. All will add to the cost of the roof slightly.
The whole roof is tied together and will be engineered as one unit and not individual sections of the roof.
If you can achieve the no post look then it is worthwhile for looks.

Post by **waanjai** » October 7, 2015, 12:52 pm

coxo wrote:*.

You could of course also ask a structural engineer, if You don't want to rely solely on the experts of e.g. CPAC Monier. I know at least one in Mueang Udon. There might be more.

Post by **sometimewoodworker** » October 7, 2015, 7:46 pm

There seems to be some degree of assumption going on.

Our design has used, and the first part of our build will use, an architect and structural engineer. So there is no problem there, they are experienced and have signed of on the strength, suitability and design of the substructure and roof.

Also I never mentioned tiles of any variety and with a 14 degree slope on the roof they would be a disaster.

The design will echo that of our Waterhouse

Post by **sometimewoodworker** » October 7, 2015, 7:58 pm

coxo wrote:
waanjai wrote: by waanjai » October 6, 2015, 10:32 pm

coxo wrote:
Well your roof members will have to be mighty big for that type of cantilever taking into account wind loads.

Again somone who does not know how strong modern structural steel roofs with concrete tiles are. Talk with the experts at e.g. CPAC Monier roofing.

Are you serious? Who has no idea? A 2.8 met cantilevered roof with no beams or posts, you are a fool! To expect a typical per metre price for a structure that would need correct engineering, do you understand wind loads waanjai, do you understand anything? I think not by your cretinous post.

Leaving out the unnecessarily pejorative language if you would like to go back a little I did not ask about the cost, typical or otherwise of our roof. In fact I did not ask about the typical cost, as I know the range.

I asked about how the square metre area was calculated.