How much would be a reasonable sum to spend for a 4 room BTO? I am wondering what is the range that people spend for a 4 room BTO without any opt ins from HDB. With lets say only built ins for the kitchen.

Maybe figure out what is your budget, and speak to a few ID for quotes before proceeding

It all depends. Even if you only have built ins for the kitchen but the length of the kitchen, whether you want an island or more full height cabinets... or if you only one bottom cabinets... all this make a diff. Best to design according to your own needs.

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Personally, I'll go for bottom row cabinets only with one full height cabinet. Will keep all the tiles and doors from HDB. So minimally I think I only want to spend about 20-30k with a contractor and not an ID. I'll do all the designs myself. The costs of materials is rising so this amount is rising fast too.