Since you do not even indicate what sizes these plants are, there is almost no basis for anyone here to work up a free estimate - which is basically what you are asking for.

Instead get additional estimates from contractors in your area, who can visit the site and see everything that is involved in the project. That is how you can get a feeling for the fair market value of your project in your market.

Six estimates should be enough for the best price to emerge. There should be more than one who comes in at about the same price. Do not go with the lowest price, unless most estimates all happen to come in at or near the bottom of the range that develops. Otherwise one might expect a cluster of similar prices, with a few that are above or below it. Somebody in that cluster will be among those knowing what the job should cost, be who you should pick.

Someone cheaper that the rest may have made a mistake, or be planning on cutting corners.

Right--you can't get an "estimate" of a job from your list. In addition to the actual sizes of plants and wholesale price variations, there are so many issues involved such as preparation, soil amendments. design, how the job and fee schedule are structured. For example, you may not necessarily be able just to get an estimate from your list from someone else--but if you did have a full "design" and job of work estimate with everything itemized, then you may be able to see what someone else would charge to do the exact same thing. Otherwise, you will compare apples to oranges (one person will plop shrubs in ground for price x, another person's estimate includes optimal soil prep and amendments, or different quality materials including plant material may be used.

Assuming that this is on your roof with no access I would guess at $15,000 plus tax.

Sandy,

All sarcasm aside. What was the itemized plant list pricing and how was the scope written up on your proposal? What was the total price? What did they say they wouldn't do or that you had to provide? What was their overhead, insurance, taxes and profit percentages(markup)?

Ink, lets see how close you came.

Aloha