Getting rid of PMII purchased a home on short sale in October of 2009. During the purchase, they appraised my house at the offer price - which I was told was fairly standard. I purchased the home for $40,000 less than it was purchased for in 2007. I put 10% down on my home, which was $31,700.I'm in a position to pay additional principle to my mortgage each month to build more equity. I'm trying to figure out how long I should do this before I have my house re-appraised to get to 20% equity.I think in 1 year, I can pay an additional 5% into my mortgage, and am hoping that it will assess at 5% higher than I purchased it. The Zestimate is already more than 5% higher than my purchase price, but I'm unclear how accurate it is. Any advice how long I should wait in this market. I got a pretty sound interest rate (5%) - so I was hoping to not refinance, and just call for a new appraisal.ThanksMarch 25 2010 - Vancouver00YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.