Thanks for the kind words, Dan!
Noblez: currently your range is between $525-540 depending on upgrades and exterior elevation. (add 3-4% per year time factor if you'd like)
For your model, to maximize sale potential (This only applies to SOME MODELS), You should DEFINITELY consider the simple addition of the wall and door for the 4th bedroom / den. With framing, drywall, trim, paint, and even moving a light switch (if you have to), the cost through contractors should be under $2,000, and this will give you an entry-level 4 bedroom home and immediately jack the price by $8-10,000 BUT, don't hire anybody, don't lift a finger or make any phone calls to start this work. I can email you details on how you can handle this "Improvement" minimizing cost and with zero interruption in your home while still maximizing the benefits in the sale price.
Don't worry about the sidewalk -- much of your competition in this price and size range when you sell will also have a sidewalk - this is more of a problem in the >2000sqft market.
Keep the questions coming, on here or to
fred@fredhelps.com whatever you prefer!
NOW -- if you are planning on buying another new one, you won't really realize much in terms of profits, after legal fees, commission, HST, closing costs, new build closing costs on the next new one, another land transfer tax on the next new purchase, new appliances, AC, window coverings, etc, so if you are doing this as a 'flip', definitely let me know and I can help you run through all the numbers to see if it is actually worthwhile doing. I've got spreadsheets and calculations with all this done since the question comes up a lot

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