I heard from my agent previously that if reno is done <5 yrs, then the reno value will be included during the valuation. Not sure if this is true. For me when I was looking for my resale flat, I saw a lot of house reno that doesn't suit my taste and ppl are asking a lot of cash on top of valuation for this. Anyway reno is a matter of taste, difficult to tell but personally I prefer a plain flat cause it's cheaper to do renovation without having to hack a lot of things.