Satisfaction with national real estate companies among home buyers has improved while satisfaction among home sellers has declined in the last year, according to the J.D. Power and Associates 2010 Home Buyer/Seller Study, released Thursday.

J.D. Powers collected 3,000 evaluations from 2,817 respondents who bought or sold a home between March 2009 and April 2010. Overall satisfaction with the buying experience is determined by rating satisfaction with the practitioner, the office they represent, and a variety of additional services. Four factors are examined for the home-selling experience: the quality of the practitioner’s performance, marketing, the office they represent, and other services.

“Among both home buyers and home sellers, the importance of [practitioners] and salespersons has increased substantially in 2010, compared with 2009,” said Jim Howland, senior director of the real estate and construction practice at J.D. Power, in a statement.

“Buyers are increasingly relying upon negotiating skills of [practitioners] and seem to be satisfied with the purchase prices they are obtaining. Despite the fact that sales practitioners appear to be doing a good job of negotiating and marketing on behalf of home sellers, the tough economic conditions are negatively impacting their overall satisfaction with real estate companies,” Howland added.

On a 1,000-point scale here are the scores in the home buyer segment:

1. Keller Williams, 817
2. Prudential, 811
3. Coldwell Banker, 805
4. Home-Buyer Segment Average, 803
5. RE/MAX, 801
6. Century 21, 798
7. ERA, 785
8. GMAC/Real Living, 765

Satisfaction ratings on a 1,000-point scale from home sellers:

1. Prudential, 760
2. Keller Williams, 751
3. RE/MAX, 744
4. Coldwell Banker, 743
5. Home-Seller Segment Average, 742
6. Century 21, 727

Source: J.D. Power and Associates (07/28/2010)