Much of pricing depends on regional, site and other specific factors which would be impossible to appraise here. But for your picture ... more than $25K if it contains a pool.

Unless you have actual landscape design talent, I'd say doing your own design is not the way to go. Many people can shovel earth, work with mortar, plant, install irrigation or wiring and do all kinds of grunt work. But even some very smart people seem to be clueless in figuring out how to organize and orchestrate a complete landscape. It's fairly common to get help with the design and then carry out instructions of a designer. Or hire out for the tasks that are outside of your comfort zone (still following the directions of the designer.) We don't know if you need only a master plan where you will figure out many details of materials to use ... or if you need a detailed set of construction drawings (much more expensive.) Many DIY people like the general directions of a master plan and then figuring out many specifics for themselves. (It might designate "shade tree" and you decide if it's sugar maple or ginkgo. A walk may be shown and you decide if it's brick, pavers or concrete.)

your link goes to a website where the homepage image changes every few seconds so I have no idea what you're looking at. Best thing I can tell you is that what you want probably doesn't cost what you expect it to. A phone conversation with a good designer can help you assess if you're even in the ballpark. If you are, an on-site meeting is the next step. Pricing is regional and based entirely on local material costs and labor costs. The $400k project we're doing here in VA would probably be $275k in Arizona and $600k in western Connecticut.

I would agree with both of the above........it is impossible to guesstimate an actual dollar total without visually seeing the site in person and discussing with you what exactly you want to include. It is not hard to eat up $25K in even a very modest landscape design :-)) I just oversaw a relatively small new construction landscape installation that consumed more than $25K in just plant material, let alone the grading, soil importation and hardscaping involved.

FWIW, California is not on the low end of the cost scale by any stretch of the imagination :-)

Thanks for your comments. I guess I will call around some designers and discuss over the phone ballpark figures.