All three of these greenhouse brands are imported and distributed by Exaco, and we carry all three lines — but they're built differently, look different, and suit different kinds of gardeners. Here's how to think about which one fits your yard.

Janssens: Classic Glass, Belgian Craftsmanship

Janssens of Belgium has been making high-end glass greenhouses for over 30 years, and it's the line most people picture when they imagine a proper English glasshouse — a Victorian roofline, real glass panes, and a 15-year manufacturer warranty. The range spans the compact Junior Victorian up through the Royal Victorian in four sizes, its Retro and Orangerie variants, and modern options like the Modern Pent Roof.

Best for: gardeners who want the classic glasshouse look and prioritize aluminum-and-glass construction.

See the full Janssens Greenhouses collection.

Alton: Western Red Cedar, English Character

Alton UK has been building Western red cedar greenhouses since 1921. The Alton line trades aluminum-and-glass construction for half-paneled cedar walls on an aluminum base frame — a warmer, more traditional look, with the natural rot-resistance and insulation cedar provides, backed by a 10-year warranty on framing. Sizes range from the Octagonal and Cheltenham up through the T-shaped Durham and Cambridge Orangeries, plus the dual-purpose Fusion greenhouse/shed combo.

Best for: gardeners who want a wood structure with real curb appeal, or who plan to use it as a garden room as much as a growing space.

See the full Alton Cedar Greenhouses collection.

Hoklartherm: Modern German Engineering

Hoklartherm, out of Germany, takes a different design direction entirely — clean architectural lines and anthracite gray framing, with an emphasis on insulation and ventilation engineering over classic ornamentation. The line spans the long-running RIGA and Riga Black, the slide-opening Arcus, and modern options like the Linea II, the triple-wall-insulated Santini II, and the Rondo Garden Pavilion.

Best for: modern or urban backyards, and gardeners who want to extend the growing season with heavier insulation rather than a purely decorative structure.

See the full Hoklartherm Greenhouses collection.

Side-by-Side Comparison

	Janssens	Alton	Hoklartherm
Origin	Belgium	United Kingdom	Germany
Primary material	Aluminum & glass	Western red cedar & aluminum	Aluminum & glass/polycarbonate
Style	Classic Victorian	Traditional cedar cottage	Modern architectural
Starting price	From ~$8,000	From ~$19,000	From ~$4,400
Warranty	15 years	10 years (framing)	Varies by model

Not Sure Which One Fits Your Space?

We're a greenhouse specialist, not a general retailer — call or text us at 732-806-7959 and we'll help you figure out which brand and size fits your yard, your climate, and your budget.