I will most probably be buying a house in 4-5 years time. Would you advice to save up the house fund in bank or buy safe stocks and sell it 4-5 years later to fund for housing expense (reno etc.)?

Never save to buy property, you will never buy when property price increase.

Buy what you can instead and upgrade later.

I would put it in a bank or buy SSB or fixed deposits cos these are capital guaranteed options. Separately, I'll think of ways to increase my income through side hustles, promotions etc. Active income is best for short terms needs.

I think the problem is there is no safe stock. I would put the money into bonds or some capital guaranteed tool if im sure i need to use the money if 4-5 years time.

If you need the money soon, it would be good to invest in etfs or robo advisor as they already help you diversify your portfolio.