Expansion Mansion Greenhouse
The 21' wide Expansion Mansion Greenhouse is one of our most versatile growing structures. Ideal for the new grower, it is easily expandable and upgradable with a variety of ventilation and mechanical system options. Its traditional arch design can be fitted with double poly film or polycarbonate sheeting. It can be constructed as a freestanding or gutter-connected greenhouse
- Expandable: Add additional gutter-connected bays as you grow.
- Poly-Vent® ventilation: Controlled, sidewall natural ventilation system.
- Double poly or polycarbonate: Choose double poly or polycarbonate structured sheeting for the covering.
Features
Freestanding or gutter connected
Available as a 21-foot wide single freestanding bay or in any number of gutter connected bays for widths of 42', 63', 84', or more.
Sidewall venting
Thermostatically controlled Poly-Vent natural venting system is a modern alternative to more expensive rack & pinion vents
Heavy-duty trussed frame sections
The Expansion Mansion features tough, 2-inch, 14 ga. Allied Gatorshield® steel frame for longevity you can count on. Load it up with confidence that it will stand up to the rain, snow and sun for years to come.

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Options
Wide range of options
Double inflated poly or polycarbonate sheeting.
Choose from a white or clear double polyethylene or several different types of long-lasting polycarbonate structured sheeting.
Variety of doors.
You can order your Expansion Mansion with a multitude of different doors for work flow and ventilation.
You can purchase just the Expansion Mansion frame or a complete package that includes poly covering, Poly-Vent sides, rain gutters, doors and more. You can even purchase a complete turnkey operation with our full line of options.
Choose the options you need and leave out those that you don't need. From fans to heaters to controls, we can configure a greenhouse specifically to your needs.
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Pricing
Frame only price includes: 2” O.D. 14 ga. galvanized frames, 3-part galvanized trusses on all intermediate hoops, diagonal struts in corners, 2” O.D. 14 ga. ridge purlin, ground stakes, rain gutter sections (on multiple bay configurations), heavy welded ring fittings, assembly hardware and setup manual.
Standard package includes: Everything included in frame only price and: Poly-Vent® III side ventilation system with 2-stage thermostats, clear, 8mm polycarbonate sheeting under side ventilation, double poly roof and end walls with inflation kit, (2) 3’-0” x 6’-8” swinging doors, and Wiggle-Wire™ poly fastener system.
21' Free Standing |
Frame only price: |
Stock# |
Size |
Square Feet |
Price |
Buy Now |
P01-EMG-F2148 |
21'W x 48'L |
1,008 |
Call for Price |
Call to Order |
P01-EMG-F2172 |
21'W x 72'L |
1,512 |
Call for Price |
Call to Order |
P01-EMG-F2196 |
21'W x 96'L |
2,016 |
Call for Price |
Call to Order |
P01-EMGF21120 |
21'W x 120'L |
2,520 |
Call for Price |
Call to Order |
P01-EMG-F21144 |
21'W x 144'L |
3,024 |
Call for Price |
Call to Order |
Standard package price: |
Stock# |
Size |
Square Feet |
Price |
Buy Now |
P01-EMG-C2148 |
21'W x 48'L |
1,008 |
Call for Price |
Call to Order |
P01-EMGC2172 |
21'W x 72'L |
1,512 |
Call for Price |
Call to Order |
P01-EMG-C2196 |
21'W x 96'L |
2,016 |
Call for Price |
Call to Order |
P01-EMG-C21120 |
21'W x 120'L |
2,520 |
Call for Price |
Call to Order |
P01-EMG-C21144 |
21'W x 144'L |
3,024 |
$20,764.00 |
Call to Order |
42' Twin Span |
Frame only price: |
Stock # |
Size |
Square Feet |
Price |
Buy Now |
P01-EMG-F4248 |
42'W x 48'L |
2,016 |
Call for Price |
Call to Order |
P01-EMG-F4272 |
42'W x 72'L |
3,024 |
Call for Price |
Call to Order |
P01-EMG-F4296 |
42'W x 96'L |
4,032 |
Call for Price |
Call to Order |
P01-EMG-F42120 |
42'W x 120'L |
5,040 |
Call for Price |
Call to Order |
P01-EMG-F42144 |
42'W x 144'L |
6,048 |
Call for Price |
Call to Order |
Standard package price: |
Stock # |
Size |
Square Feet |
Price |
Buy Now |
P01-EMG-C4248 |
42'W x 48'L |
2,016 |
Call for Price |
Call to Order |
P01-EMGC4272 |
42'W x 72'L |
3,024 |
$21,756.00 |
Call to Order |
P01-EMG-C2196 |
42'W x 96'L |
4,032 |
Call for Price |
Call to Order |
P01-EMG-C42120 |
42'W x 120'L |
5,040 |
Call for Price |
Call to Order |
P01-EMG-C42144 |
42'W x 144'L |
6,048 |
Call for Price |
Call to Order |
63' triple span |
Frame only price: |
Stock# |
Size |
Square Feet |
Price |
Buy Now |
P01-EMG-F6348 |
63'W x 48'L |
3,042 |
Call for Price |
Call to Order |
P01-EMG-F6372 |
63'W x 72'L |
4,536 |
Call for Price |
Call to Order |
P01-EMG-F6396 |
63'W x 96'L |
6,048 |
Call for Price |
Call to Order |
P01-EMG-F63120 |
63'W x 120'L |
7,580 |
Call for Price |
Call to Order |
P01-EMG-F63144 |
63'W x 144'L |
9,072 |
Call for Price |
Call to Order |
Standard package price: |
Stock # |
Size |
Square Feet |
Price |
Buy Now |
P01-EMG-C6348 |
63'W x 48'L |
3,042 |
Call for Price |
Call to Order |
P01-EMG-C6372 |
63'W x 72'L |
4,536 |
$31,282.00 |
Call to Order |
P01-EMG-C6396 |
63'W x 96'L |
6,048 |
Call for Price |
Call to Order |
P01-EMG-C63120 |
63'W x 120'L |
7,580 |
Call for Price |
Call to Order |
P01-EMG-C63144 |
63'W x 144'L |
9,072 |
Call for Price |
Call to Order |
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Specifications
» Width: 21'-0"
» Length: starting at 18' with increments of 6'Expansion Mansion Greenhouse
» Sidewall height: 6'(Standard ) 7' or 8'
» Height to apex: 11'-4" (6-for sidewall)
» Frame spacing: 6'
» Truss height: Approx. 8'-6"
» Truss System: 3-part truss made of 1" and 1.66" galvanized tubes
» Roof Cover: clear or white 6 mil UVI treated polyethylene or polycarbonate
» End wall cover: Clear or white 6 mil. UVI treated polyethylene or polycarbonate
» Frame: 3" o.d. 14-gauge galvanized steel tubing
» Structural purlins: (1) run of 2" x 14 ga. galvanized steel tube
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Support
If you need additional technical support or have a question, we can be reached 8:30 AM to 5:30 PM central time, Monday through Friday at:
Phone: 800-531-4769 (toll-free US and Canada) or 251-471-5238
FAX: 251-471-5465
E-mail: info@gothicarchgreenhouses.net
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Accessories
Poly Film: Choose from 1-year or 4-year, 6mil poly covering. Available in clear or white.
Call for volume purchases.
>> More information
Poly Patch Tape: Poly Patch is the leading film repair tape in America. A complete first-aid kit for greenhouses, this easy-to-use patching tape bonds aggressively to polyethylene film.
Call for volume purchases.
Galvanized End Frame Packages: Optional galvanized end frame kit speeds set up and eliminates the need for any lumber. Heavy-duty swinging door includes 8mm clear polycarbonate sheeting.
Galvanized End Frame Package
Galvanized end frame with door: 14' (3' x 6'-8") 16', 18' or 20' (4' x 6'-8")