While I dither what to do with my house (see my dilemma in another thread :) ) I can just wait for everyone around me to spend heaps of money on their properties and bring the value of the street up. Providing I do basic maintenance I can't see how I can possibly lose out in the long run as the increase in value of their properties is going to drag mine up. Effectively I bought a block of land in a good area ( the house was free) and I'm fairly sure that they won't be making any more land locally :D
Definately the key to making money on a renovation ( if that is your intention ) is to buy in the right area and NOT to overcapitalise - back in the UK we watched lots of neighbours buy their council houses and turn them into little palaces. When it came to selling there was a reality check.
1. a percentage of homes in the street were still council houses the possible purchasers were put off by the possibility that they could find themselves living next door to the family from hell ( note I grew up in council housing and I'm NOT saying all council tenants are riff-raff ).
2. the council regulation paint schemes and redecoration schedule meant that the palaces were interleaved with extremely average looking homes - cars up on bricks in the front garden an added bonus.
3. the sellers expected to get their money back for "enhancements" that those not put off by 1 and 2 either didn't want or didn't think were worth what the renovator had spent.
That said there is nothing like seeing the results of your hard work - turning an ugly duckling into a swan. I do think that you've got to be hard headed about the financial aspects though. I've twice had to move for job reasons when I hadn't planned to so before investing in the gold bath taps it might be worth asking "do I really need to spend that much on taps".
If you are a couple renovating I think you have to both be in the same boat rowing in the same direction though. If one of the pair enjoys DIY and the other would rather eat worms than pick up a paint brush you're heading for strife.