Landscape Installation & Construction in Seattle
Trillium Landscape Design handles landscape installation from the ground up. Whether you're building a new outdoor space or transforming an existing one, our team manages hardscaping, planting, raised beds, fencing, pergolas, and more.
We’re a design-build company, which means we can take your project from the initial concept drawing through final installation. No handoffs, no gaps in communication.
Pricing
We believe in being upfront about cost. Here’s a general range for installation projects:
Hardscaping
$10,000
Starting at
Planting and softscapes
$8,000
Starting at
Full installation projects
$15k - $75k+
Installation projects have a $5,000 minimum. The final cost depends on the scope of work, site conditions, materials selected, and whether design services are included.
We provide a detailed estimate after your initial consultation before any work begins.
Our Installation Process
Our approach to hardscaping is thoughtful, collaborative, and tailored to your specific needs:
Why Trillium
We’re a design-build company, not a subcontractor. When you work with Trillium, the team that designed your space is the team that builds it. That means fewer surprises, better craftsmanship, and a result that matches the original vision.
We work exclusively in the greater Seattle area — from the Central District to Edmonds, Bellevue, Redmond, and Sammamish. We know the soil, the drainage patterns, and the plants that perform here.
Licensed, bonded, and insured
Contractor License: TRILLLD773N4
Frequently Asked Questions
What is the minimum project size for installation?
Our minimum for installation projects is $5,000. Most full installation projects fall in the $15,000 to $75,000 range depending on scope and materials.
Do I need a design before you can build?
For larger projects, yes — we strongly recommend a design phase before breaking ground. For smaller or more straightforward installations, some elements can be designed in the field by our crew.
Do you handle permits?
Permit requirements depend on the scope and type of work. We’ll discuss what’s needed during your consultation and coordinate the process as part of the project.
Do you warranty your plants?
Yes. We warranty all plants for one year after installation, provided there is a functioning irrigation system installed or evaluated by our irrigation professional.
Can you work with an existing contractor?
Typically, no. We prefer to keep everything in-house to ensure quality and continuity. The exception is specialized trades that fall outside our scope, such as irrigation, which we coordinate through our trusted partner.
Contact Us Today
Ready to Build?
Tell us about your project. We’ll schedule a consultation, walk your property, and put together a detailed estimate.
