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Alton Greenhouse
Cheltenham Cedar Half-Boarded Greenhouse
$29,150
Save $-29,150
Size : 16'8" L x 8'8" W
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Product Details
The Alton Cheltenham Wooden Greenhouse is a traditional, premium cedar greenhouse designed to combine classic garden aesthetics with practical growing performance. Its distinctive half-boarded Western Red Cedar construction, tall proportions, and steep 45° roof pitch give it a timeless appearance while creating a bright, open growing environment.
The greenhouse features Grade A, knot-free Western Red Cedar, selected for its natural durability, insulation properties, and resistance to moisture and rot. The natural variation in cedar means individual boards may differ slightly in tone and grain, gradually developing a characteristic silvery-grey appearance as the wood weathers.
A substantial aluminum base frame raises the cedar structure above ground level, helping reduce exposure to ground moisture. Precision joinery helps maintain a rigid, square, and accurately aligned structure over time, while aluminum capping and rubber seals protect important glazing points from weather exposure.
The 3mm tempered safety glass provides clear natural light throughout the growing area. The steep roof also provides additional internal height, with a 10-foot peak, making the greenhouse particularly suitable for taller plants, hanging baskets, climbing crops, and larger growing arrangements.
Ventilation is designed to operate without electricity. Roof vents with automatic wax openers respond to rising temperatures, while louver windows provide additional airflow and circulation. A lockable hinged door provides secure and convenient access, and the low threshold makes it easier to move pots, trays, tools, and other gardening equipment in and out.
What’s Included
The Alton Cheltenham greenhouse kit includes the principal structural, glazing, ventilation, access, and finishin components required to create the complete greenhouse structure.
Cedar Structure
Western Red Cedar greenhouse framing
Half-boarded cedar lower wall construction
Grade A, knot-free Western Red Cedar components
Precision-machined and joined cedar framework
Glazing
3mm tempered safety glass for roof glazing
3mm tempered safety glass for wall glazing
Aluminum glazing capping
Rubber sealing components for glazing points
Base & Structural Components
Integrated aluminum base frame
Aluminum exterior capping
Structural hardware and fixings
Doors & Access
Single hinged door
Lockable door with keys
Low-threshold access design
Ventilation
Roof vents with automatic wax openers
Louver ventilation windows
Vent quantities vary according to greenhouse size
Shelving
Shelving provision for one side of the greenhouse, including:
12" deep, 2-slat shelving
20" deep, 4-slat shelving
Exterior & Finishing Details
Victorian ridge cresting
Gutters
Downspouts
Hardware
The exact number of roof vents and louver vents depends on the selected greenhouse size.
Technical Specifications
Build and Materials
Brand: Alton
Distributed by: Exaco
Manufactured in: UK
Frame: Grade A, knot-free Western Red Cedar with a classic half-boarded design
Frame colors: Moss Green or Natural Wood
Wall glazing: 3mm tempered safety glass
Roof glazing: 3mm tempered safety glass
Roof pitch: 45°
Foundation: Integrated aluminum base frame that raises the cedar above ground to help reduce early rot risk
Ventilation
Roof vents: Automatic wax-driven openers provide hands-free ventilation as temperatures rise, with no electricity required
Roof vent quantity: Varies by greenhouse size
Louver windows: Provide lower-level airflow to improve circulation
Roof vent dimensions: 23" × 23"
Performance Ratings
R-value: 0.95 or 1.35 depending on glazing configuration
Rainwater collection: Integrated gutters with downspouts on both sides of the structure
Wind/snow load ratings: Not listed on the provided source
Other
Door: Single hinged, inward-swinging, lockable door with keys
Door dimensions: 28" × 79"
Threshold: Low threshold for easier access
Shelving: 12" deep 2-slat and 20" deep 4-slat shelving
Ridge detail: Victorian ridge cresting
Expandable: No
Warranty: 10 years on frame
Installation & Manuals
Assembly typically takes 2–3 days with a crew of 2–3 people — this isn't a same-afternoon build, largely due to the glass glazing work and the size of the larger models. Buyers should plan the timeline and labor accordingly, especially if they're coordinating with a foundation contractor beforehand.
Manual
Delivery & Prep
Free shipping to all 48 contiguous states
Delivery time: 8–13 business days
Ships via LTL freight (curbside): liftgate drops the pallet at ground level; plan on 2–3 people to move it from the curb to your install site
Outside the mainland US (Alaska, Hawaii, international)? Shipping terms need to be confirmed separately
Warranty & Returns
Warranty
Damages
Please inspect the packaging of your item(s) upon arrival. If you notice any damage, make note of it when signing for delivery. If your item(s) arrive damaged, please contact us with photos and we will process an insurance claim on your behalf.
Cancellations & Refunds
Orders cancelled after 48 hours are subject to a $20 administration fee, whether or not the order has shipped. If the order has already shipped, the buyer is also responsible for actual return shipping charges. Refunds are issued only to the original credit card used at the time of purchase.
Many of our items are large and heavy, and cannot be returned for buyer's remorse. In these cases, all sales are final.
Returns (RMA)
In certain situations, we will accept a return through our RMA department. The buyer is responsible for full return shipping costs. All returns must be pre-approved by our RMA department before being shipped back.
Cambridge Features
Classic Cedar Style With A Stately T-Shaped Design
The Cambridge T-Shaped Cedar Half-Boarded Greenhouse brings warm Western Red Cedar, toughened glass, and a tall orangery-style layout together for a beautiful, practical backyard growing space.
Spacious Grow Area
Choose from 154 sq. ft. or 194 sq. ft. of floor space for larger plant collections and flexible growing plans.
Tall usable space
The taller design gives you better headroom, more comfortable movement, and extra room for growing.
T-shaped orangery design
The stately T-shaped layout adds a strong focal point to your backyard and creates a more elevated garden feature.
Western Red Cedar frame
Natural cedar helps insulate the greenhouse, reduce temperature swings, and create a more stable growing environment.
Rot-resistant construction
Western Red Cedar naturally resists rot, handles moisture well, and offers long life with minimal maintenance.
Built-in Details
Designed for airflow, drainage and everyday use
Features for ventilation, durability, insulation, and a better greenhouse experience.
Automatic roof vents
24" x 24" roof vents open and close without electricity to help control airflow and temperature.
Manual louver windows
31" x 41" louver windows add side airflow when plants need extra ventilation.
Sealed roof glass
Aluminum roof caps create a tighter seal for better insulation and added weather protection.
Lockable hinged door
A single lockable hinged door with a low threshold makes entry secure, simple, and easy to use.
Toughened glass panels
3mm toughened glass sits tightly in the cedar frame for a clearer, stronger build with less rattling.
Protected aluminum base
The aluminum base keeps the wood off the ground to help reduce early rot and long-term wear.
Compare models
Compare Cambridge T-Shaped Sizes
Find the Cambridge size that fits your space, growing goals, and garden layout.
Cheltenham 9 x 13
From $24,200
- Dimensions 12'6" L x 8'8" W
- Grow Space 109 sq. ft.
- Doors 1 lockable hinged door
- Roof vents 4 automatic roof vents
- Louvered window 2 manual included
- Misting system Not Included
- Best for Balanced growing space
Cheltenham 9 x 17
From $24,200
- Dimensions 16'8" L x 8'8" W
- Grow Space 145 sq. ft.
- Doors 1 lockable hinged door
- Roof vents 4 automatic roof vents
- Louvered window 3 manual included
- Misting system Not Included
- Best for Smaller garden layouts
Cheltenham 9 x 19
From $24,200
- Dimensions 18' L x 8'8" W
- Grow Space 163 sq. ft.
- Doors 1 lockable hinged door
- Roof vents 5 automatic roof vents
- Louvered window 4 manual included
- Misting system Not Included
- Best for Largest plant collections
Cheltenham 9 x 21
From $24,200
- Dimensions 20'10" L x 8'8" W
- Grow Space 181 sq ft
- Doors Single sliding
- Roof vents 5 automatic roof vents
- Louvered window 4 manual included
- Misting system Not Included
- Best for Compact gardens
15-year Janssens frame warranty
Every Royal Victorian greenhouse is backed by Janssens' 15-year frame warranty, with durable powder-coated aluminum construction made for long-term outdoor use.
Optional Additions
Build out your Greenhouse for the way you grow
Additions can help tailor your greenhouse to your needs.
Our team can help you choose what makes sense for your setup.
Cooling and airflow
Shadecloth, exhaust fans, and fly screens can help manage heat, airflow, and pests.
Growing and storage
Seed trays, shelves, and work surfaces help organize plants, tools, and supplies.
Entry and access
Threshold, door, ramp, and stem wall options can make entry easier based on your site.
Seasonal growing
Heaters, thermostats, and winter covers can help support colder-weather growing.
Planning Ahead
Prepare Your Site Before Your Cambridge Greenhouse Arrives
The Cambridge T-Shaped Cedar Greenhouse features cedar, glass panels, and a porch entry. Prepare the site, foundation, and water access for installation.
Foundation prep
The Alton Cheltenham should be installed on a flat, level, and stable foundation that can properly support the integrated aluminum base frame and the greenhouse structure above it. A solid, accurately prepared base helps keep the cedar framing square and aligned, while providing consistent support for the tempered glass, door, vents, and other components throughout the life of the greenhouse. Because the aluminum base raises the cedar above ground level, the foundation should provide a firm, continuous surface beneath the base and help prevent movement caused by settling or uneven ground. Taking the time to establish a properly level foundation before assembly is essential, as an uneven base can lead to alignment problems with the frame, door, glazing, and ventilation components later on.
Anchoring
Once the foundation is ready, the greenhouse needs to be anchored securely to it. Use the manufacturer-recommended hardware for your region's wind and snow load — anchoring requirements aren't one-size-fits-all, and what holds a structure firmly in a low-wind, low-snow region may not be adequate somewhere with heavier seasonal loads. Matching your anchoring hardware to local conditions is part of making sure the greenhouse stays put and performs as expected through the seasons it's actually going to face.
Water and power
If you're planning to run water or electricity to the greenhouse — for irrigation, misting, heating, lighting, or anything else — those utility runs need to be planned before your site work is finished, not after. Coordinate with your electrician and plumber early so water and power lines can be brought to the greenhouse footprint as part of the same site preparation, rather than trenching or rerouting once the structure is already in place.
DIY & Installer support
Whether you're a confident DIYer or you'd rather bring in a professional, there's a path for either approach. For those installing it themselves, the groundwork above (foundation, anchoring, utilities) is the core of what to plan for. For those who'd prefer help, support is available to connect you with vetted installers so the greenhouse goes up correctly the first time.
Need help planning ahead?
We can help you think through foundation, utilities, delivery access, and installer support before your greenhouse ships.
Delivery
What to expect when your greenhouse ships
Before delivery, you'll receive tracking details and guidance so you know what's coming, where to place it, and how to store the parts before assembly.
Freight delivery
Your greenhouse ships by LTL freight and is delivered curbside. Greenhouses typically arrive in about 8 to 13 business days, including packing and transit time.
Plan for large crates
The Cambridge includes cedar frame sections, toughened glass panels, aluminum capping, and long components, so plan enough space for drop-off and temporary storage.
Unload safely
The driver will unload the freight shipment curbside. Have help available to move long cartons, glass panels, frame sections, and cupola components after delivery.
Store parts dry
Store all greenhouse components in a garage or covered dry area until assembly. Keeping everything protected helps prevent packaging, frame, and glass issues before install.
Frequently Asked
Quick answers around choosing, ordering, delivery, and setup.
The Cambridge works well for year-round growing, plant collections, seed starting, garden-room use, and relaxed outdoor living.
Your VI46 ships with the greenhouse frame, glazing, and the hardware needed for assembly, along with setup guides. See the specifications above for a full parts breakdown, or reach out to our team with any questions.
Yes. The VI46 supports a range of optional additions—including shelves, shade cloth, and fans—so you can tailor it to your setup at any time. Explore the add-ons above to build out your greenhouse.
Permit requirements vary by location. Some areas require a permit for a structure of this size, so we recommend checking with your local building department before installation.
Yes. Built with durable powder-coated aluminum and backed by a 15-year frame warranty, the VI46 is made for long-term outdoor use. With added insulation and optional heating, it supports growing through cold-weather months.
Our greenhouses use rust-resistant aluminum frames paired with tempered safety glass or twin-wall polycarbonate, so they stay durable and beautiful through every season.
Absolutely. With proper insulation, ventilation, and optional heating, our greenhouses support growing through every season.
Most greenhouses can be assembled over a weekend with two people. Larger models may take a little longer, and clear step-by-step guides are included with every kit.
Yes. A level base such as a concrete slab, paving, or a purpose-built base kit keeps the structure stable and square over its lifetime.
We offer free curbside freight delivery on greenhouse orders within the contiguous US. Any surcharges for remote areas are shown clearly at checkout.
In-stock greenhouses typically ship within 3–5 business days, with freight delivery arriving 1–2 weeks later depending on your location.
Our greenhouses are backed by manufacturer warranties, including up to a 15-year warranty on Janssens frames. Full coverage details are listed on each product page.
Reach out with your order number and a quick photo, and we'll arrange a replacement part right away at no cost for qualifying issues.
Financing Now Available!
Explore low-rate financing options for qualified customers, including greenhouse structures, accessories, and foundation costs.
Need help planning?
Not sure which model, size, glazing, or setup makes sense for you? Our team can help you compare options, plan your site, and understand the steps before you order.
