Hi Eileen. I am a local Realtor here in the lehigh Valley and can offer this information. I will assume you are the home seller in this scenario.
You are the seller of your home. Your listing agent will present you with an agreement of sale. In this agreement , it will include all the terms of the sale. This will include the price , conditions, inspections, and of course the timing. Timing is always of the essence. You will all agree in writing what dates will be used. When you all agree in writing, and each party has a copy of the fully executed agreement of sale, then this is what you will follow. It is that simple. It is your home, you control the deal on times.
Now, should you need to make a change to the agreement, for example, you need more time to vacate, then your Realtor must prepare an addendum, and have it signed by all parties. This is the way to do it. Everyone agrees in writing.
Typically, the seller must be out by the settlement date. The final walkthrough is held by the buyer of the property as close to the settlement time as possible. The seller must be out before the walk through, and the keys are transfered at the closing table.
Again, an addendum is very easy to prepare, to change the dates of the agreement. But each party will need to agree in writing, and each party needs to have a copy of the addendum to make a change.
Good luck. Should you need a good realtor in the area, please call
Don BRadbury http://www.bradburyteam.com