We bought our house new. It was nothing more than a vacant lot when we signed the paperwork.
We looked at lots of model homes and many of those builders tried to get us to sign with them, but our real estate agent told us not to do this - if we did, she no longer had the right to assist us.
Why use a real estate agent when buying a newly constructed home?
First of all - costs YOU no additional money, the builder has to share the commission.
Secondly, a good real estate person knows lots of the pitfalls you wouldn’t know - certain things to check during construction, what to buy and, more importantly, what NOT to buy as “upgrades” during construction. For instance - an upgrade to better doors throughout the house was a good deal - far cheaper than waiting and then removing and putting in better doors later (and you would be surprise to count how many doors are in any house!). But don’t get the upgraded appliances (way overpriced and you can get better and cheaper appliances from any Lowes or Home Depot or Sears.) Will you need that upgrade to a water softener? Will you need a bigger water heater? Will adding the fireplace be worth it? Things like that.
Lastly, when the house in finished and you are ready for that final walk-through, your real estate agent knows exactly what to look for. If you find problems in time, the builder has to fix them for free - but later, it is your problem. We found lots of (mostly minor) errors, but enough that it took them an additional three days to fix everything; from bad paint jobs, loose hinges and other cosmetic as well as substantial construction errors.
For instance - she had us turn on every tap in every sink full blast, and then flush the toilets non-stop. Why? Because often, during construction, the sewer line is installed from the street to the house (by the city) before they actually connect the house to the sewer line and dirt/rocks get accidentally shoved into the sewer during construction - blocking it, but not enough to be noticeable immediately. Sure enough, this was true in our case and they had to bring a special plumber who spent about 3 hours cleaning that sewer connection. I can only imagine having to pay to have for that out of my own pocket a few month/years later!
So - yeah, having a real estate agent in your court doesn’t cost you any extra and it is nice to have someone who knows all of the little things you would never think of.
BTW - one thing we all missed:
In our bathrooms, after about a year, there was discoloration on the floor around the toilets? When I checked, I found that they had forgotten to put on the screws to the toilets holding them to the floor! They had been sitting there, held only by gravity! Thus the slow bit of water leakage that eventually caused damage to the bathroom floors.
So, I can see where builders might not like having to share commissions with a real estate agent, and most certainly don’t like to have them in your court for their expertise, but I would tell them to fuck off and insist they accept the fact or forget the sale.