I looked at some rules regarding constructing homes, but couldn't find outlined info and most regulation are decessions audited at Malay.
my Question is simple, what type and regulation of personally building house.
for few years in Malaysia I noticed 98% of houses are built by companies on large scale, but some houses are designed and built by owners.
I even noticed some neighborhood of tin houses without design or construction studies, for example near Padang Jawa LRT, shah alam.
any one has outline answer?

any Ideas here?

Your answers can be found in
National Land Code 1965
Town and Country Planning Act 1976
Street, Drainage and Building Act 1974

Put simply, the legal way - if you want to build your own house, first you need to have a piece of land, with land title under your name. Engage architect and engineer to design the house and submit the plans to local authority (majlis perbandaran xxx/dewan bandaraya xxx) for approval. Upon approval obtained, engage a contractor to build it. Upon completion, architect issues CCC and you are ready to move in.

no plan just thought, I read some of the acts don't remember the numbers or names.
construction and architect design expected as all world I think now, the procedure rulls and how it applied from officers and official technician and engineers is the large question!
I came across incident at construction site not by owner but by mass constructor were the official tech officer rejected a handy method of construction, asking for heavy machinery method which is expensive for such small area.
as I have some experience at my country were the handy method is the major method, I was surprized, because if the procedure insist on the heavy machinery as the only construction method, it means the small and owner building houses will not be affordable.
this means the regulation is preventing the small construction.
many engineer friends at high temperature countries said there is no technical reason to prevent the handy low cost construction method for small areas like small houses, it has the same machinery efficiency if applied correctly with proper tools.

constructing 1000 sq F house will be doubled if used heavy machinery instead of handy construction method, the regulation orientation to encourage one and restrict other is economical not technical.

From my personal experience I see no reason why heavy machinery must be used. In construction I take a 'outcome' approach. I don't care how you do it, I care whether it is properly done with workmanship up to my standard of acceptance, and they are according to approved plan with all product/contractor's warranty, and compliance to all building and fire requirement.

I think in Malaysia only projects exceeding a certain amount of construction cost needs to adopt IBS.

because I am not in contact with construction business maybe the incident was special case I don't know, that why I asked here
in my country every flat area above 250 sqm ~ 2700 sqf are required to use heavy machinery and complete all concrete casting before the concrete start Hardening ~4hours normally.
but using heavy machinery is cost efficient above 150 sqm "don't know in Malaysia".
but in my country even 150 sqm 3-4 level building could be constructed by owner slowly using small teams handy work, which I didn't see ever in Malaysia.
handy work for 1500-2000 sqf tow level could take 6-12 month while mass constructor done it by 1-2 months within multi identical units project or even pre-casted concrete components need only to be assembled, nothing special all unit the same.