Rent out old house or sell?

[Amateur bob]

good afternoon im looking for advice if anyone can offer their opinion, im in a situation just now where i have just moved from my old house which was too small into a larger rented one, i own the old one outright and have just gained planning permission to build a house too,

 

im at a crossroads now do i rent the old house out to help pay my rent while i organise the housebuild(which could take a couple years) or do i sell and put the money into savings and collect 4-5% interest? the only issue with renting out is getting a tenant back out and house prices dropping....likewise house prices could continue to rise and i could miss out on that and the rent money

 

any advice appreciated

 

thanks