Larger Growing Footprint
Available in 17 x 10 ft or 21 x 10 ft to give you room for plants, benches, pathways, and storage.
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5.0 | based on 9 reviews
$30,250
Save $-30,250
Size: 16'8" L x 10'9" W
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Product Details
The Alton Lancing Glass-to-Ground Greenhouse combines premium materials, spacious design, and traditional UK greenhouse craftsmanship to create a long-lasting growing environment. Built from knot-free Western Red Cedar, the structure offers natural insulation and a warm, timeless appearance. The cedar is specially treated to help resist water absorption while allowing it to age gracefully, while the glass-to-ground design maximizes natural light and creates a seamless connection between the greenhouse and garden.
The Lancing features 3mm clear tempered glass and substantial timber glazing bars measuring 1.73" × 1.73" and 1.73" × 2.71", providing strength and stability throughout the structure. Its high-eave design creates additional headroom and usable growing space, making it easier to arrange plants and move comfortably inside. The overlapping roof glass is designed to improve water management and help reduce the potential for leaks, while the aluminum foundation frame and capping provide a durable base for the greenhouse.
Ventilation is built into the design with five automatic roof windows measuring 24" × 19" and four louvre windows measuring 31" × 41", allowing air to circulate and helping regulate temperature and humidity. The greenhouse also includes one lockable hinged door measuring 2'5" × 6'7", along with integrated guttering and downpipes for effective rainwater management. An optional alternative to wood capping is available for those looking for a lower-maintenance, highly durable finish.
Designed as a long-term investment, the Lancing is built for an expected 30–40 years of use when properly maintained and includes a 10-year frame warranty. Its insulation performance is supported by an R-value of 0.95 for the glass and 1.35 for Western Red Cedar, helping moderate temperature changes within the growing space. Combining durable cedar, tempered glass, aluminum components, generous ventilation, and over a century of UK greenhouse craftsmanship, the Lancing is suited to gardeners looking for both practical performance and a refined architectural addition to their outdoor space.
What’s Included
- Premium Western Red Cedar framing
- 3mm clear tempered glass glazing
- Aluminum foundation/base frame
- Aluminum capping
- Guttering and downpipes
- 1 lockable hinged door — 2'5" × 6'7"
- 5 automatic roof windows — 24" × 19"
- 4 louvre windows — 31" × 41"
- Timber glazing bar
- Greenhouse framing, glazing, and hardware
- 10-year frame warranty
Technical Specifications
Build and materials
Brand: Alton, manufactured in the UK
Frame: Premium, knot-free Western Red Cedar with aluminum components
Glazing: 3mm clear tempered glass
Glazing bars: Thick timber glazing bars, 1.73" × 1.73" and 1.73" × 2.71"
Foundation: Aluminum base frame with aluminum capping
Roof: Overlapping glass panels designed to help reduce water leakage
Design: Glass-to-ground construction with high eaves for increased headroom and growing space
Expected lifespan: 30–40 years with proper care
Ventilation
Automatic roof windows: 5 × 24" × 19"
Louvre windows: 4 × 31" × 41"
Ventilation system: Combination of automatic roof ventilation and louvre windows for airflow and temperature management
Performance ratings
Glass R-value: 0.95
Western Red Cedar R-value: 1.35
Durability: Cedar and aluminum construction designed for long-term outdoor use
Roof drainage: Guttering and downpipes included
Other
Door: 1 lockable hinged door, 2'5" × 6'7"
Capping: Optional replacement for traditional wood capping for lower maintenance and increased durability
Warranty: 10 years on frame
Origin: Imported from the UK
Craftsmanship: Over 100 years of UK greenhouse manufacturing experience
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 Alton Lancing Sizes
Find the Alton Lancing size that fits your space, growing goals, and garden layout.
Alton Lancing 10 x 16
From $30,250
- Dimensions 20'10"L 10'9"W
- Grow Space 179 sq. ft.
- Doors 1 lockable hinged door
- Roof vents 4 automatic roof vents
- Louvered window 3 manual included
- Misting system Not Included
- Best for Balanced growing space
Alton Lancing 10 x 18
From $30,250
- Dimensions 18'L 10'9"W
- Grow Space 202 sq. ft.
- Doors 1 lockable hinged door
- Roof vents 5 automatic roof vents
- Louvered window 4 manual included
- Misting system Not Included
- Best for Smaller garden layouts
Alton Lancing 10 x 20
From $30,250
- Dimensions 20'10"L 10'9"W
- Grow Space 224 sq. ft.
- Doors 1 lockable hinged door
- Roof vents 6 automatic roof vents
- Louvered window 5 manual included
- Misting system Not Included
- Best for Largest plant collections
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 Lancing should be installed on a flat, level, and stable foundation. A properly prepared base supports the weight of the Western Red Cedar frame, 3mm tempered glass, and aluminum foundation frame while keeping the structure stable as the ground naturally settles and changes with the seasons. Because the Lancing has a glass-to-ground design and substantial glazing, the foundation needs to remain consistently level across the entire footprint. Taking the time to prepare a solid, even base before assembly helps prevent issues such as door and window misalignment, uneven glazing, and unnecessary stress on the frame 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.
