DS 9age 12) and I moved in with DP about 8 months ago.
We had to live in his home as it goes with his job, he has 4 kids who live there 3 days a week. DP has been there for about 16 yrs and it was the marital home for about 12 of those yrs. DP ex wife left him. Ultimately DP has the right to choose who lives in his house as the house goes with his job, so there is no tenancy agreement or mortgage for me to be on.
I was a single Mum for 8 years, always worked and always supported us single handedly. Have no immediate family so never had any support there like other single Mums I know and my ex has never been v reliable or dependable. I owned my own house (now tenanted) and DS and I had our own routines and lots of nice, quiet time. We have a close bond and I am very proud of him. We lived in the town where DS could see his friends and was starting to get some independence.
Try as I might, I just cannot make it feel like home and I think that is down to emotional issues rather than practical ones.
DP is always home and I am at work or looking after 5 kids at weekends or out doing adult things on weekends we don't have all the kids. I never, ever get to be home on my own or with my DS and I miss having that time and space.
House rules and routines tend to be the same ones that have always been in the house, although I have managed to instigate a few new things.
We are having building work done to extend the house and this is a good opportunity for me to put my stamp on things, but as DP is home all day, he is project managing things and I feel like my input is minimal.
DP earns more money than me and therefore tends to pay for luxury things when we go out, leaving me feeling like I'm not "really part of it".
DP, has, I feel, issues with DS and I feel there are a lot of double standards in how his own children behave and how he expects DS to behave - this is a whole other thread, which has been done and I am working on.
We live in a v rural location and we have to ferry all the children everwhere as there are no buses and no transport to school. This literally takes up hours and hours every week and the kids have no freedom.
When I do get a day off, DP brings business clients into the house (he does have an office outside) to make them tea / lunch etc. and I feel I am pushed out of certain rooms.
We have the luxury of a cleaner, which I am v grateful for but I wonder if not cleaning my own home doesn't help? I was v houseproud of my little house before.
DP's family all live close by, so we will entertain them or they will just pop in. I dont' have any immediate family and my best friends don't drive, so can't come and visit unless I pick them up.
DP and his ex wife do not get on and I feel we are used as babysitters for her. I never get any say in when the children come and I have told DP this makes me feel like a lodger even though I do plenty of looking after the children when they are with us.
Reading all that back, I can see why I don't feel like it is my home. 
Any opinions would be appreciated.