GC's, roofers, architects etc. tend to give a quote for free, especially if there's a lucrative contract involved.

. + @RaeLena Morrison I'm under contract on a HPTC project now and learning A TON, so I'm not expert but have spoken to more experienced developers and architects.

My question is do any of you use services from landscape designers or landscape architects to either sell homes or during a flip/rehab?

The first step would be to consult an architect.

I'm waiting for my architect design which is due next week.  

Or have a structural engineer or an architect go out there and say that there is nothing wrong with how you put in the window and that its plum, sealed tight and water proof and write that in their professional opinion that its okay. 

That being said, I do have some need for an interior designer/architect when I am doing additions or moving walls to create new spaces. 

In building a spec home, give yourself enough time to coordinate with your architect to insure that your preliminary plans for a home will work for the lots.

I follow an architect here on BP, @Jim Adrian and he usually has some creative and practical ideas for boosting curb appeal.Adding to what @Mike Hanneman advised, I don't think splitting the paint horizontally into two tones is serving any helpful purpose.  

We are builders, and our son does architectural renderings for us (he's not an architect) We just sold a new home off his renderings, before we even closed escrow on the land!