Originally Posted by LisaB4657
When you send a letter by certified mail, also send it by regular mail. (At the bottom of the letter, under your signature, put "sent by regular mail and certified mail, return receipt requested".)
If the certified mail gets returned because there was no one to sign for it, or if it gets refused, but the regular mail does not get returned, then a court will assume that they received the one that was sent by regular mail and you satisfied the requirement to give written notice.
Send a letter immediately by regular mail and certified mail, listing all of the items that need to be fixed. Then say that they have 14 days to respond and schedule the repairs. Finally, say that if they do not respond and schedule the repairs within 14 days then you will arrange for the repairs to be done by another contractor and the builder will be responsible for the costs.