Riga Door Frame Extension Kit
Riga Door Frame Extension Kit – +20" Height | Riga IIs, IIIs & IVs
The Riga Door Frame Extension Kit adds 20 inches of height to the door frame of your Riga IIs, IIIs, or IVs greenhouse when the structure is mounted on a raised foundation. It fills the gap above the door opening that results from elevating the greenhouse, eliminating the need to build a custom step-over or workaround for the raised door frame.
*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, standard shipping rates apply.
Key Features
- Adds 20" of height to the Riga door frame
- Designed for raised foundation installations — fills the gap above the door opening
- Compatible with Riga IIs, Riga IIIs, and Riga IVs greenhouse models
- Eliminates the need for a custom step-over or workaround at the door
- Purpose-built Riga accessory — no modifications required
Specifications
| Height Added | 20 inches |
| Compatible Models | Riga IIs, Riga IIIs, Riga IVs |
| Use Case | Raised foundation installations |
| SKU | RIGA-DOOR-FRAME-EXT-234S |
| Price | $379 |
| Shipping | Free when purchased with a Riga greenhouse; standard rates apply when ordered separately |
When Do You Need This Kit?
When a Riga greenhouse is installed on a raised foundation — such as a concrete pad, timber base, or elevated platform — the door frame sits higher than the standard ground-level installation. This creates a gap above the door opening between the top of the door frame and the greenhouse structure. The Door Frame Extension Kit fills this gap cleanly and professionally, restoring the door to its intended appearance and function without custom fabrication.
If your Riga greenhouse will be installed at ground level on a standard base kit, you do not need this extension kit.
Which Extension Kit Do I Need?
Riga offers two door frame extension kits — make sure you order the correct one for your model:
| Kit | Compatible Models | Price |
|---|---|---|
| This kit | Riga IIs, Riga IIIs, Riga IVs | $379 |
| Other kit | Riga III, Riga IV, Riga V | $439 |
The "S" suffix models (IIs, IIIs, IVs) are the smaller variants within each Riga size tier. If you are unsure which model you have, check your greenhouse documentation or contact us with your model number.
Frequently Asked Questions
Which Riga models is this kit compatible with?
This door frame extension kit is compatible with the Riga IIs, Riga IIIs, and Riga IVs greenhouse models — the smaller "S" suffix variants. It is not compatible with the standard Riga III, IV, or V models (those use a different kit priced at $439), or the Riga XL. If you are unsure which model you have, contact us with your greenhouse model number before ordering.
What is the difference between the Riga "S" models and the standard models?
The "S" suffix (IIs, IIIs, IVs) denotes the smaller length variant within each Riga size tier. For example, the Riga IIIs is shorter than the standard Riga III. Both share the same width and arch profile but differ in length. The door frame extension kits are model-specific, so it’s important to order the correct kit for your exact model.
Do I need this kit if I’m using the standard Riga base kit?
Not necessarily. The standard Riga base frame raises the greenhouse by 6 inches. Whether you need the door frame extension depends on the total height of your foundation. If you are installing on a raised concrete pad, timber platform, or other elevated foundation that significantly raises the greenhouse above ground level, this kit is recommended. Contact us with your foundation height and we’ll confirm whether the extension kit is needed.
Why is free shipping only available when purchased with a greenhouse?
The door frame extension kit ships free when ordered together with a Riga greenhouse because it can be included in the same shipment. When ordered separately, it ships as a standalone item and standard shipping rates apply.
Can I install this kit myself?
Yes — the extension kit is designed for straightforward installation without specialized tools. It attaches to the existing Riga door frame. Contact us if you need installation guidance specific to your model.