We are coming to the end of our renovation / rebuild, having lived in a static caravan on site with 2 kids for just over a year.
It has been the most stressful period of my life ever. We would have divorced many many times, except neither of us could face the extra stress (nor did we have the money, or indeed the brain space to contemplate the logistics of it).
My husband (self employed) has not worked for the last 6m as he's had to be on site for the builders, and now is doing the decorating etc to enable us to move back in again. He will probably spend the next 3-4m doing stuff on the house before he is able to get back to his own work (and then he has to find clients again, so probably there's 12m of his lost earnings).
It has cost us more money than we thought (about ÂŁ150k), as once we started, we found things that had to be fixed, and the problem with large scale things, once you start you can't stop.
Our greatest success is that we are both still alive, the kids are still alive (!), one sat the 11+ (and we are now waiting for results....) and we are still married. We will still be doing work to the house and garden for the next 5 years, as and when we can do it.
Was it worth it? We will never be on speaking terms with the builders again (no great loss to my mind). We will have spent a lot of money. We bought the worst house on the nicest street, in the nicest area we could afford. It is a great area, great schools and there is a lovely community there. We will end up with a lovely house, exactly (mostly) how we wanted it, and it will work perfectly for what we need it for.
But yes, sometimes I drive past 80's / 90's little box houses (no offence to anyone who lives in one of these intended....), and think, I could be living there, with nothing more to do to the house or garden, no mortgage, and the biggest thing I have to do to the house right now is wonder whether to cut the lawn / get a new sofa / change the handles on my chest of drawers....
It will be worth it yes. But do get the potential changes to it valued by an estate agent before you start / once you finish, so you have a way out, if you need it.