Grandio Summit 4' Extension Kit

Grandio Summit 4' Extension Kit

The Grandio Summit 4' Extension Kit adds a full 4 feet of length to your existing Grandio Summit greenhouse, giving you approximately 32 square feet of additional growing space. Starting at $1,200, it's the most seamless way to expand your Summit greenhouse without replacing your existing structure — the extension is custom-designed to integrate perfectly with the Summit frame, maintaining its strength, style, and performance.

How Much Space Does the Summit 4' Extension Add?

The extension adds 4 feet to the length of your Grandio Summit greenhouse, resulting in approximately 32 square feet of additional interior growing area. This is enough space for an extra row of benches, a dedicated potting station, additional grow beds, or simply more room to move around comfortably inside your greenhouse.

What Anchor Options Are Available?

The Summit 4' Extension is available with four anchor configurations to match your foundation type:

• Wood — $1,200 — for installations on a wood floor or deck
• Concrete — $1,200 — for anchoring to an existing concrete slab
• Dirt (Adds Base Kit) — $1,400 — includes a base kit for soil installations (+$200)
• No Anchor or Base Kit — $1,200 — if you already have anchoring hardware or plan to source separately

Is the Summit 4' Extension Compatible with My Greenhouse?

This extension kit is designed exclusively for the Grandio Summit greenhouse model. It is not compatible with other Grandio models such as the Ascent, Elite, or Element. The extension is precision-engineered to match the Summit's frame dimensions, glazing system, and structural profile for a factory-finished result.

How Is the Summit Extension Installed?

The Summit 4' Extension is designed to integrate with your existing Summit greenhouse structure. Installation uses standard hand tools and follows a step-by-step process to extend the frame and attach the new glazing panels. The extension ships in 1–2 weeks. Contact Grandio support if you have questions during installation.

Key Features

• Adds ~32 sq ft — 4 feet of additional greenhouse length
• Seamless integration — precision-engineered to match the Grandio Summit frame
• Four anchor options — wood, concrete, dirt (with base kit), or no anchor
• Premium materials — built to the same weather-resistant standard as the original Summit
• Summit exclusive — designed specifically for the Grandio Summit greenhouse model
• Grandio warranty included — backed by the Grandio greenhouse warranty

Why Extend Instead of Buying a New Greenhouse?

Extending your existing Grandio Summit greenhouse is significantly more cost-effective than purchasing a new, larger structure. You keep your existing foundation, glazing, and frame investment while adding exactly the space you need. The extension maintains the same structural integrity and appearance as the original, so there's no visual compromise — it looks and performs like a single, larger greenhouse from day one.

In stock — ships in 1–2 weeks.