it just like lying an ordinary floor slab, but advices thickness should be the range of 5" to 6" with reinforcement bar of Y12. If you cast on a hard ground are very much cheaper compare with a soft ground. Do factor in if you Santa do multiple stores.

Do a simple calculation of 40ft x 10'= 400 ft.sq. let say it's rm 12 per sq feet, that's mean cost about 4800.

Installation of pipeline and electrical cost not much unless you need to install a toilet.

You can try rubber like laminated flooring. Do get a good quality one as the thickness and pressed texture will wear off if you get a cheap one. It is water resistant, stain proof, sound proof and most important cost and easy maintain.

Normally this happened due to poor mixture (cements, sand and water) and bad preparation on sub-base.
Too much cement, less water, it cracks
Too much water, less cement, also cracks or peel of when knock it with a finger.
Too much sand, it become sandy.

Sub base must be clean from dust or sand only can do screening, but most contractors and developers won't care much on this.

To rectify it, sell the property or hack and rescue ending again

If for kampung land then much more easier...for sure it is much more cheaper...try to get ready made from China much more easier.
Depends which state u r in. Some states u can avoid the authority.

Based on my knowledge, asbestos being banned in selling n use in Malaysia long time ago. Any houses which used that materials, I would suggest to change.

Yup

Make sure you have enough bullets to be subcon. If you dealing business with developer or main on, do have a preparation of slow and bad paymaster. I would either suggest you go do renovation works or getting small or medium government projects.

Based on my observations, studies and experience. This is just sharing a piece of my thoughts and there is no right and wrong for property costing or any other fields such as cars, foods, clothes, private hospitals or schools and etc.

Since we are talking about construction costing and profits of each earning. I would like to break it down as below.

1. As developer, it is controlled by our local housing department. All developer license and sales permit mostly handling by this department including bumiputra lot and non bumi lots. One of the criteria is that developer must submit their gross developement value vs their nett sales margin. This value must be exceed of 15% margin. Duration of granted approval is another issue as wages are being paid monthly to the office employees.

2. Architect, C&S engineer, m&e engineer, surveyor, quantity serveyor (QS). This are major professional that developer will hire for a basic project. Their charges varies from 15% to 20%, it depends how big is your project and started engaging them one by one from your land purchased. This hasn't counted the land need to be clear, Level, reclamation, cut or remove excessive soil. Another aspects are soil investigation and load investigation.

3. Contractor. Contractors tendering each projects also based on their own rate as some factors do affects their rate such as overhead expenses and self ownered machineries or not, and their skills, but do not worry on this part as there is a market rate for this. But do remember costing for projects are much more different from renovation costing.

4. Materials costing. One of the key factors. This also depends on developer and architect as design concern or cost concern. For example floor tiles, floor types do have few qualities and types such as homogenous, marbles, timbers, cement screening and etc. all price are varies. Another aspect is suppliers, some can get a good deal for a same supplier and some not.

5. Workers, it depends on either on skills workers and local or imported. This is because their wages also one of the key factors.

6. Marketing. Normally fixed of this about 1~3% of total sales for dis department. It will cover all sales personnel wages, brochures, phone bills or some advertising and lastly commission. This allocation starts from first launching till completed sold all units. Time is a main key factor.
Marketing will determined by developer depends on few factors. Targeted market, demands and workmanship and services.

basically these are the factors influenced the property selling price. There are many more factors which I yet to fact in as if I do put in, then end up I will be writing a book.

Sorry if I wrongly mentioned as this is based on my area. All pricing are varies from each state. Sorry for the wrong msg.

It relies on what product u using. Range from 15 to 400 psf

Any warranty on performance and labor?

You may try to collect near river bank or swamping area. If want a convenient you may try look for pottery factory or shop.

Normally will be around 4 to 6 mt. for steel bar.
Concrete, if my memory is good, you can simply estimated more o less about 25m3. And included varies of grade.

i used to startup a body of proffesional board for assist buyers to check defects on their properties before getting the key, but still a dream now.

hmm...how come concrete so high? concrete roofing?