Landscape Design And Construction San Diego . Landscape architects & designers in san diego. 5 out of 5 stars. Affordable San Diego Landscape Design Letz Design from letzdesign.com I started this landscape design and construction company to showcase my love of creating landscapes. I put care and quality workmanship into every project as if it were in my own back yard. We create permeable paving, driveways, entryways, sidewalks, decks, patios, and balcony hardscapes that are environmentally conscious with designs constructed to withstand the elements in southern california.