If their home has been up for awhile, your home has an added 300 sf which may be of perceived value to someone which means yours would sell first. Nothing better then using the neighbors property to get yours sold! You might save months of marketing time and then that difference is a wash.
Best way to calculate the value of your home is:
1. Choose an agent that knows how to do a thorough analysis of the comps - additionally - they should to go out and preview homes which your would be competing with. Then, once the price in narrowed in on - choose the price JUST below the most recent SOLD/Closed comp.
2. I ALSO hire and pay for an independent appraisal. WHY? Ultimately it is the banks appraisal which trumps everything. ALSO - you may put the appraisal out for buyer review to further validate the asking price.
3. Make sure that the Realtor you choose is excellent at marketing your home by using Social Media Syndication, in additional to traditional methods of marketing, this is key to exposinhg your ome to the max number of potential buyers...
If you would like to learn more its easy - just give me a call .... It's my Pleasure