SundialHomes is really horrible, the worst builder I have ever met. Their house selling price is very high, but the quality of the house does not match the price. Basically, you pay way more than what they can provide you.
The major issue that my house has is all kinds of water leaking issues. If you happen to buy your house from them, please find these issues within the first 2 years from when the house is closed. My experience of dealing with them is that whenever a water leaking issue is reported to them, they try to run away from the issue and do nothing. Instead, they will offer you some non-essential benefits (for example, water-wash your exterior wall surface for free) to move your attention away from the major water-leaking issue. Please do not fall into the trick.
You could turn to Tarion for help and request conciliation inspection if they go too overboard. That was what I did.
Their upgrade work also sucks, but they charge way more than it is worth. Please be careful. Depending on where you are living, you can visit the house they have already built and ask the owner about the quality of upgrade work. This way, you will have your own opinion.
I will never ever buy any house/property from SundialHomes again.