We're nearing the end of a renovation in London - new electrics, plastering, every fitting and fixture changed, two walls down to create family bathroom and kitchen diner, cloakroom in, decoration of whole place, garden totally redone, fireplaces in, stuff to plumbing - list continues.
We have a toddler and I am pregnant and we both have quite demanding jobs. It will have taken us 10-11 months from hellhole to pristine, and I'd say we've worked 20-30 hours a week if you count researching, dealing with trades, DIY, garden, trips to Homebase etc. At any one time, we have both been working through a couple of A4 sheets of jobs.
For me if it is worth it is mainly about money - be very careful about the purchase price and your own ability to come up with funds. In terms of budgeting, I thought about 50k and I'd say it will have cost more like 60k - but that's including rather nice light fittings, curtains, carpets, paint - so I'd say we'd have spent at least 5k on those on most 'okish' houses that we needed to update. But the point is that is still an extra 10k we've had to come up with! What is hard is how you bleed £200s on everything - I never knew how much radiators cost, say, and every big job unveils issues.
There is a difference between dated/can be done gradually and utter dump that needs addressing immediately - ours was the latter and you need immediate funds for that type, think about what yours is.
For us it has been very stressful - I never wanted a doer upper and I will be so happy when the very last trade has left the house! However, a combination of rising prices and having managed to buy at a good price/work hard to keep costs down, mean that we'd have to pay the best part of 100k extra (obviously including the renovation costs) to buy this done up as it is now, so it has been worth it because we couldn't have found that money.
And it is done to our taste and beautifully new whereas I found there were a lot of scruffy places going for an absolute mint.
Sorry for the essay!