This was probably my favorite thing in Bangkok and was included in the Grand Palace ticket, otherwise it's 100 baht. We couldn't take pictures inside and had to put all our belongings (excluding only a wallet) in a 20 baht locker (one time use). Once inside, the tour takes about 30 minutes and nothing is marked so taking a tour might be a better option if you want to know more about what you're looking at. They have English and Thai tours but I didn't see a price. The house takes about 30 mins to see. If you're short on cash, you can walk 10 mins to the throne hall next door (or take the free shuttle) and use the free lockers there, see the mansion then return to the throne hall, and take your things. The dress code is the same as the grand palace, no legs, shoulders or boobs showing. They only have clothes for sale (no borrowing).
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