We listed our house on Rightmove 5 days ago. Had 12 viewings on Monday and 7 have made offers above asking price. One is 26 percent above asking price. We haven't accepted any yet. Our estate agents have noted that if we go with the highest one the mortgage valuation will likely undervalue the property. What happens if this is the case. I'm not suggesting they are wrong but we've done lots of work to the property since we bought it. How do we ensure the mortgage company are aware so they take this into account when valuing the house? I'm a first time seller so a bit clueless.