If purchasing subsale landed (let's say double story terrace house in Klang Valley), roughly how much needs to be set aside for reno? How to get a ballpark figure so that can start approaching contractors and negotiate price? What is the rough estimated cost of some of the following:-

1. Checking of existing fittings (plumbing/electrical)
2. Complete replacement of plumbing
3. Complete replacement of electrical
4. Flooring/tile replacement
5. Marble grinding/sanding
6. Breaking down of wall or setting up of partitioning wall
7. Installing additional plug points/networking jacks
8. Installing built-in cabinets/storage compartments
9. Kitchen counter/tabletop/island/sink
10. Fence removal/replacement
11. Raising/lowering of floor level for driveway

Currently need to plan budget first, then only see if can proceed, but I have no idea how much these things cost in the first place, so I don't know if someone is offering me a good deal or cutting my throat. Mohon pencerahan semua.

I would say your benchmark shoudl start with the age of the house.

Anything < 5 to 8 years, you can maybe look at it from a prespective of superficial and target between 100k to 350k depending on how much work you want to do .

If the house is more than > 10 to 12 years, the first thing you need to look at is all the plumbing and based on a full redo + piping + tiling + new bits and bops and maybe soime build in cabinet, it will run you back 30k minimum pre covid - i can only assume its more like 50k now

my 4300 sqft semi d, redoing 1 bathroom and built in cabinets for hall, master, knocking down a wall to combine 2 rooms into 1 guest room, indoor kitchen, and all the furnishing for an empty house set me back close to 500k in 2019.

Mind u just 1 bathroom.

my friend spent almost 140k to redo the whole house :X

last month, i got quotation directly from the worker's boss, a Burmese guy, so i can bypass the middle man. I got his contact from a friend.
Just for replacing 1200 sqft house tiles (whole house including toilets) and house roof - it'd cost me RM 100k.

Thanks, my context is houses which are 30+ years old, so probably closer to the lower amount.

Any details you can share, what does 'redo the whole house' mean? Definitely not knock down to the ground and build back up right? Size of house?

Tiling only, no wall work etc?

yes, tiling only. This was quoted for an old house, 60 years+.

The older the house, the more renovation work needs to be done.

I think for old house with minimal renovation to make it livable, you'll need at least 250k.

That was what I planned earlier. All through direct engagement with the workers, without middle man.

Middle man would probably charged extra 20% for themselves.

Ended up didn't proceed with the house purchase coz the reno cost is too much.