Can i just check I understand ? Your plan to fund your retirement is the state pension plus a lump sum that you will get from selling a holiday apartment . Is that right?
So that lump sum ( after taxes and expenses ) need to be about 20-25 times what you need or live on each year, minus your state pension.
You say you don’t save anything now, so you know your total living costs now - it’s your whole net income. So let guess and say your total income is £40k.
Do you expect to spend more or less in retirement ? Will you cut your standard of living? Or do you want to travel , socialise etc? I’m guessing the latter.
So you need £40k per year. Let’s say your state pension is £8k per year, therefore you need £32k per year. £32k x 20- 25 is £640,000 - £800,000.
So the sale of your holiday apartment ideally needs to make you £800k.
I have no idea of apartment prices in Portugal but I’m guessing that’s not realistic. Thats why posters are telling you that you need advice. Your plans are unrealistic and you are not saving nearly enough.
And you’ve not even factored in anything for your child /ren, to support them through their education or help them onto the housing ladder.
Of course these are all just back of an envelope calcs with random figures and it takes no account of what you will do with that lump sum when you get it and protect it from inflation, what taxes you will pay on the capital gain from the sale - here in the Uk is 18%, so very high.