Anyone knows where to get free HDB valuation other than the usual 99.co and SRX?

Hey there, anon! You can get a free valuation of your HDB flat on Ohmyhome: https://ohmyhome.com/en-sg/home-e-valuation-v2/ Hope this helps you!

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While not a valuation tool, I've developed sgp.fyi based on hdb's resale transaction raw data from data.gov.sg.

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You can use it to check on actual transacted prices for the hdb unit all the way back to the last 15 years (2007-2022). hope it helps!