Some maths for people.
Say you were going to buy a £220k property on a standard 3.5 multiple mortgage.
You would need a household income of £63k.
Mortgage companies have become a lot stricter on what they will lend, and whilst 100% mortgages have made a return they are HARD to get. Mortgage companies need you to show what your disposable income after your expenses. So if you have children, its not just the expense of having children its also that the amount a mortgage company will lend you that's affected. So you are much less likely to be able to get a mortgage multiplier higher than the standard if you have kids. The interest rates on 100% mortgages are high, so again if you had two kids, you'd find it harder to get approval on one because of affordability criteria.
Its possible but everything is working against you.
£63,000 as a household income is WAY above the average income. A lot of couples without children will struggle to hit that. Throw in child care and that's even more difficult.
So say you had a household income of £50,000 which is still above average (especially with kids) but for two professionals is achievable (average income is about £20k. That would give you a mortgage of around £175,000
That still leaves you with £45,000 to find. Say you manage to save £10,000 per year, thats STILL 4 and a half years. And in that time you might find the house has increased in value by £15,000 (if not more). So 6 years of saving very hard indeed, to buy a house thats probably smaller than you need if you have two kids.
The reality is that even if you save, really really hard and don't go out, or have holidays and budget your food, chances are you will never ever manage it.
I've pointed out the figures to people before and every time I do it, it shocks people to silence when they think about what their own household income is and where they are now in the housing ladder.
I know numerous people who went confronted by actual figures, go silent and then say they could not afford to buy a house now.
The 'well I saved hard' mantra just doesn't stack up.
Unless you have assistance to bridge that gap, you can not do it. Its just not possible.