Greenhouse Foundation Guide
Greenhouse Foundation Types
Choosing the right foundation is essential for a stable, long-lasting greenhouse. Below are the most common options.
Wood Frame – Above Ground
Built directly on the surface – quick to set up and easy to level. Material: 6x6 or 4x4 + 2x8 cedar or treated lumber |
Wood Frame – In-Ground
Set flush with the ground in a trench for a cleaner, permanent look. Material: 6x6 or 4x4 + 2x8 cedar or treated lumber |
Wood Deck Foundation
A raised deck-style platform, ideal for an elevated greenhouse. Material: Cedar or treated lumber Position: Above ground |
Concrete Frame Foundation
A durable concrete perimeter for a permanent, heavy-duty base. Material: At least 6" wide concrete with rebar footing Position: Flush with ground or half above ground |
Concrete Slab Foundation
A solid concrete pad that doubles as both foundation and floor. Material: Concrete with rebar footing Position: Flush with ground or above ground |
How to Build a Wood Frame Foundation
The wood frame is the most popular and accessible option. Follow the steps and diagrams below to build yours.
Step-by-Step Instructions
- Refer to the dimensions in your product manual.
- Build a frame that is 4" longer and 4" wider than the greenhouse base.
- Center the greenhouse base on the wood frame.
- Secure the base to the frame using screws.
Diagrams & Reference
Top View – Mounting Base Layout
Attachment Detail
Foundation Cross Section
Greenhouse Steel Base Profile
The diagram below shows the cross-section dimensions of the steel greenhouse base, applicable to all foundation types.
Disclaimer: All information provided is for suggestion purposes only. Please consult a professional if you are unsure about your foundation requirements.