Here's what Trulia has to say about how they establish value...
"A Trulia Estimate is just that: an estimate of a home's worth. Our estimates use a ton of info, including recent sales of similar homes and home facts like number of bedrooms and bathrooms, square footage, and more to provide insight into what a home is worth. You can help us improve our accuracy by telling us what you think of your homeâ€™s Estimate, and by claiming your home and updating its facts.
Don't see a Trulia Estimate for your home? Don't fret - it doesn't mean itâ€™s not worth anything! Trulia Estimates are only available in locations where we believe our estimate is within a reasonable range of accuracy. Currently, more than 50 million homes across the US have Trulia Estimates, a number that will continue to expand. Check out our coverage and accuracy for homes with Trulia Estimates in available counties across the US.
If you're looking for a precise value for your home, or if you're thinking of selling your home, we recommend you talk to a real estate professional. After all, our algorithms are smart, but we can't know everything about your homeâ€™s features and location. Connect with real estate experts in your area."
I would suggest that at a minimum you log in as the owner and edit the home facts. As previously mentioned, your best bet is to contact a local professional.
Premier Valley Realty