Santa Barbara | Montecito Aluminum Lean-To Greenhouse / Sunroom Kit With 8mm Twin-wall Polycarbonate Glazing

Santa Barbara


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Before You Purchase

Before you Purchase has several things to consider before ordering a large greenhouse or building. You should also review our Refund Policy.

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The Santa Barbara Montecito 6 ft or 9 ft Wide Lean-To Greenhouse is built with a ruggedized, heavy-duty, exclusive “Insalume” frame. This provides added durability and insulation. It is available in a wide range of sizes to fit any yard and growing capacity.

The strong aluminum frame is highly insulated with 8mm twin-wall polycarbonate panels that slip perfectly into the pre-cut channels in the frame, to create dead air spaces that serve as insulation. No bar caps or gaskets are needed because of this smart design, and everything is bolted together with hefty 16 gauge steel plates to create a sturdy and durable structure.

The lean-to greenhouse can fit into a narrow space against your house or garage. If located against your house, it will reduce heating costs. If placed over a door or window, the heat from your home can be utilized to maintain growing temperatures throughout winter. Another advantage is the easy access from your home into your greenhouse. Locate your greenhouse where it will receive the most sunlight possible November through January.

The Santa Barbara Montecito Lean-To Greenhouse Kit is designed for ease of assembly. Depending on how much help you have, it can be erected in just 2 or 3 days. All parts are pre-cut and pre-drilled at the factory and all the hardware is sorted for your convenience.

Clear and fully-illustrated directions are included, and technical support is available direct from the manufacturer if needed. The Santa Barbara Montecito Lean-To Greenhouse is sure to bring your family many years of use and enjoyment.

The Santa Barbara Greenhouses/Sun Rooms are made entirely in America.

Optional Complete Package

You can select our Complete Package when ordering.

Everything You Need for a DIY Greenhouse

The Montecito greenhouse with our complete package will provide a safe haven where you can grow beautiful plants year-round no matter the climate, and our aluminum greenhouse benches elevate your plants so they’re surrounded by warm, humid air that helps them grow – and keeps them off the ground, where crop-killing cold can leak in.

Our complete package is a one-stop solution for constructing a DIY greenhouse. You’ll receive:

  • Our durable, heavy-duty Montecito “Insalume” frame
  • Our 8mm double-wall polycarbonate side and roof panels to insulate your greenhouse
  • Sturdy, durable aluminum benches - one bench in 6ft models. Two benches in 9ft models.
  • Automatic mist system
  • Exhaust fan sized for your greenhouse
  • Thermostat
  • Heavy duty 5000BTU heater - 20ft and 24ft models include 2 heaters. Upgrade to 220V 19kBTU heaters available for an added $241 each.
  • Automatic intake shutter - 20ft and 24ft models include 2 shutters
  • Sunscreen shade cloth sized for your greenhouse


  • CUSTOM ORDERS, NO RETURN - Santa Barbara greenhouses are built to order and so it cannot be returned. Please call us if you have any questions or concerns.
  • BUILDING RESTRICTIONS - Please check with your Home Owner Association and local zoning office for any required permits and issues pertaining to zoning, setbacks, or restrictive covenants.
  • IMAGE DISCLAIMER - Some images may not be to scale and/or show building with optional contents or accessories such as furniture or shelving that are not included.
  • SEALING NEEDS - No gaskets are needed though foam or rubber weather stripping can be use along with color-matched caulking to create a watertight seal against the attached structure.
  • Frame: Aluminum, All Bolt Construction
  • Frame Color: Mill Finish or Bronze Powdercoat
  • Rafter Ties for Extra Strength
  • Side Wall Height: 6 ft
  • Peak Height:
    6ft wide greenhouse: 8ft 2in
    9ft wide greenhouse: 9ft 3in
  • Glazing: Commercial grade 8mm twin-wall polycarbonate side walls with polycarbonate roof. It filters harmful UV-rays and allows about 80% light transmission
  • Panel width: 4ft
  • Door: Hinged Dutch door with upper and lower half.
  • Door Dimensions:
    6ft wide greenhouse: 24 inches wide, 75 inches tall
    9ft wide greenhouse: 36 inches wide, 81 inches tall
  • Small plants can be hung from rafters
  • All necessary heavy-duty galvanized hardware is included
  • Includes steel brackets and lag bolts for attaching to a home; customer will supply expansion bolts if needed
  • All parts are pre-cut and pre-drilled. The kit is designed for simple assembly in 2-3 days
  • Detailed installation guide with pictures and step-by-step instructions
  • Friendly technical support available from Santa Barbara Greenhouses for installation help
  • Proudly made in the U.S.A.
  • Financing available through Affirm or PayPal.
  • Exterior Dimensions:
    6ft wide and 8, 12, 16, or 20 ft long
    9ft wide are 8, 12, 16, 20, or 24 ft long
  • Peak Height:
    6ft wide greenhouse: 8ft 2in
    9ft wide greenhouse: 9ft 3in
  • Side Wall Height: 6ft
  • Panel Width: 4ft
  • Door: Hinged Dutch door with upper and lower half.
  • Door Dimensions:
    6ft wide greenhouse: 24 inches wide, 75 inches tall
    9ft wide greenhouse: 36 inches wide, 81 inches tall

10 year limited warranty on polycarbonate
1 year limited warranty on parts
Santa Barbara Greenhouses guarantees against defects in manufacturing and workmanship

7 Great reasons to buy from us:

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  • Image of 7 topreasons No Sales Tax
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  • Image of 7 topreasons Price Match
  • Image of 7 topreasons Live Customer Service
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Questions & Answers

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  • Like the design and price. Concerning about installation. Do you have local partner to help installation? How much cost? OR, if DIY, is it difficult and need handyman?

    We don't have local recommendations for installers for this brand in particular. This is a high-quality brand, and the 'fit and finish' of the milled parts and glazing pieces is very impressive. Most of our customers install these themselves and find that everything fits beautifully. The foundation is important, as you are connecting two structures together and the greenhouse needs to be on a flat and level serface, and laying a nice concrete foundation might be outside some homeowners skill set. We do an an installation services page that might help you get started finding a local installer. As for cost, this will vary widely but we often find a good rule of thumb is to expect to pay 1/3 to 1/2 the cost of the greenhouse for a quality installation.

  • Do the Santa Barbara lean-to anchor to the wall in any way?

    Yes, all the Santa Barbara lean-to's must be anchored to a wall for wind and sealing. 

    For the deluxe redwood models, we provide ledger boards and lag bolts for this. 
    With the Montecito we provide lag bolts and steel 90 degree brackets.

    Depending on your siding type and wall type, you may need to provide expansion bolts or other methods so that you have a good fit and seal.