Sorry but I think that is a bit tight if you want to take your income out of the equation. However, move before having DC as it is so much harder afterwards.
The only suggestion I would make is to live off your DH's salary only now if you do decide to go for it and save yours until you have children. I would advocate working PT but that is a personal choice for each family.
I live in a 4 bed Edwardian house in London and it is a MONEY PIT.
Bills each month (council tax, insurance, water, gas and electricity) are around £500
Other - internet, streaming services, gym, car expenses - about another £300
Then there is maintenance, we put aside £250 a month for this because there always seems to be something. We completely gutted this house 3 years ago but still there are bits that fall off or go wrong. We know we need a bit of roof replacing (which we stupidly didn't do three years ago to save some money). Sash windows are my current bane.
Childcare costs in London are crazy. My 2 DC are at school but wraparound care for 4 days a week (I work PT now) is still £300 a month. Then there are the school holidays - I use clubs and we take leave but still I put aside £100 a month for this.
DC activities - swimming, music and dance lessons £180 a month
I would say with food and running a car our general expenses are around £2.5k a month on top of the mortgage. This doesn't include clothes, haircuts, days out, holidays, eating out, birthday presents, parties, Christmas etc
Our take home is just under £7k. Mortgage £1,400.
We had a large deposit and so our mortgage is less than half of yours but we still quibbled as it is such a commitment we borrowed over 20 years.
Our theory was that as rates are so low we may as well borrow now and have the enjoyment of more space with the DC (we lived in a flat before) however we save a lot, car is a basic run around, holidays are cheap and cheerful (usually visiting friends and family).
We throw extra into our pensions with the plan being we can use the tax free cash to pay the mortgage off when we can access it or if we don't need it to have a better retirement.
We also have six months expenses saved (£30k) just in case and we have plenty of insurance, especially for DH who is the main earner.
It very much depends on the lifestyle you have/ want.