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There is only one reason that you should have trouble putting a price on something and that is that you are uncertain of exactly what you will be doing. The trick is to define the project in the contract and take away as many variables as possible. Then you know exactly what you will be doing which then should be relatively easy to estimate time and expense on.
This is how I do any design pricing which I give a contract price for.
First I meet with the person or people who are going to sign the contract to get an idea of what they are expecting both in terms of landscape and the design product that I will produce.
Then I define what I am going to do and what I am going to provide for the price. This includes number of meetings, number of revisions, how many sheets of paper, what scale, number of copies, color or black and white, ... AND that anything not covered by the contract is an extra and will be billed as such. Included in all contracts is an Appendix that has hourly rates for design, clerical work, travel time, ... who owns the plans, what happens if either party no longer wants to finish the job, ...
Once that is done, I have a good idea of the time it will take to do the project as defined and putting a price on it is simple. You'll also find that the clients are much better at getting themselves organized and preparing you in order to avoid the need for additional meetings or revisions that will result in additional billing.
Remember that you are selling the job with the contract price and that the hourly rate should not be aimed at being appealing to make a sale (the contract price could make or break your sale rather than the hourly rate). The hourly rate should be substantial enough to make it a good pay day if they add more work and to keep your client interested in keeping you on track.
The biggest pitfall is open ended revisions and meetings that can add a zillion hours to an otherwise simple project. You have to give a number to both of those in a contract. You should be able to have one meeting before the design, one meeting to present a draft plan, one revision from that meeting, and a final presentation meeting for most design contracts. If you don't put that in the contract, they will send you back to change the flower color of a Rhododendron one week, redraft the shape of a stepping stone the next, .... You have to build in a mechanism for them to want to declare the project done or to get very well compensated if it goes on.
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