We have four kids living full time, and my stepchild is here 70% of the time, so five.
They all have to help in. Before bedtime, they each spend ten minutes tidying their room (so they get a bit of winding down time) and putting toys or clothes or whatever way. I spend that ten minutes doing a bit of tidying too, and usually spend a further ten minutes just pottering and tidying around, as does DH.
We are in a 3bd. My stepchild has his own room, but he will be moving out in two years. The other four are 10 and 10, and 3 and 2, so they share rooms in those pairs. By the time my step son moves out, that means the 10yos get their own room. Six years later, they'll hopefully move out, by which time the other two can have their own room.
There's loads of washing. The older children all put their washing in the basket, and as a rule, if they come in and the basket is full, they put the load on. They know the times and how to do it. Usually it's me or DH who do it as of course we will take in the younger 2s and they have e most washing. It's the same with the dishwasher, or if you cook something, you wash up. The older ones generally like hoovering as it means they can listen to music with earphones and don't have me nagging. They can also text away without me telling them to get off their phone, so they do it because, as long as it is done well, it means they have ages to text their friends.
We don't drink or smoke. DH cleans the kitchen floor every other day, it takes five minutes tbh, as long as we clear up messes when we make them. I also clean the floor every other day, so it is spread evenly. We wake up at 7 together, and while one wakes the kids up, the other does a quick tidy. Then after the tidier has eaten and the kids have eaten, we generally swap, so that I will sweep the kitchen floor or whatever day it is, he might, and the other deals with the rest of the kid stuff. The cleaning time also means we have time to do a quick bathroom clean.
We have to budget hard. They go to free clubs at school only, although their grandmother has bought them each a membership to the pool, so they go their regularly, without us paying. The younger two go to a childminder which is cheaper for us. We take the bus and tube everywhere.
Homework is hard. The 14yo is doing GCSEs and we are prepared to help, but he doesn't really want the help as he's better than us at a lot of stuff. The 10yos do their homework without our supervision, and we check when and if asked, and we have a tick off sheet for homework. We have a set homework time for them, an hour and a half long divided into two bits, which helps and also means we have 1-1 with one of the younger children. For project stuff which needs adult help, we are stretched tbh.
It can be quite hectic. The older DC help out with the littlies but not much, they are great entertainment. The older ones also generally keep themselves fine- the 14yp is out all hours with either his friends or his girlfriend, and the 10yos are with friends or are in their room doing something or other, without needing us there.p