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everyone values great/better design differently. floor space, volume, personality, trends, materials, etc.
As you say, the return is mostly personal satisfaction. If it is a place that you are going to spend 10 years in, it can be invaluable !? as an example, i chose to put some oak parquet instead of carpet in a flat i have been in for 6 years, i couldn't quantify the benefit i get from it in every aspect.Comunication and trust is key and work both ways. If you chose to stop the architect's intervention at the drawing phase then use those as a template and you are happy with that, i see nothing wrong ?
Return of what? I’m not sure how much extra return on investment a great design adds beyond added floor space and layout.
I can see a greater return of personal satisfaction.
Our architect specified all the top branded and premium materials which would have added about £20000 extra (our builder used the technical drawings as a guide).
Not sure getting the design within a specified price point was his biggest priority!