- Free Shipping Across mainland UK
Buying a greenhouse is one of those decisions that looks simple on the surface and reveals its complexity once you start looking closely. The range of options available — different widths, different shapes, different frame configurations — can feel overwhelming if you approach it without a clear framework.
The good news is that the decision is more straightforward than it appears, because the variables that actually matter are few and specific. This guide walks you through them in order. By the end, you will have a clear recommendation for which KLASIKA or BALTIC LT greenhouse suits your garden, your growing ambitions, and your practical situation — and you will understand exactly why.
Before looking at individual models, it helps to understand the four questions that genuinely determine which greenhouse is right for you. Everything else — colour, accessories, panel thickness — can be decided afterwards.
1. How much width do you have available, and how much do you want? Width is the most fundamental dimension. It determines how much you can grow side-by-side, whether you can fit raised seedbeds with a comfortable central path, and whether the greenhouse will fit in your intended location. The KLASIKA and BALTIC LT range offers four width options: 2m, 2.35m, 2.5m, and 3m.
2. What shape suits your garden and your growing style? The range includes three distinct profile shapes — arched/tunnel, teardrop, and house/apex — each with different internal headroom characteristics, different aesthetics, and different suitability for certain crops and garden contexts.
3. Do you want a built-in foundation skirt, or will you manage the base yourself? Some models include an integrated 10cm steel foundation skirt; others do not. This affects both installation and how the greenhouse sits on different surface types.
4. Do you want the flexibility to extend your greenhouse later? Every model in the range is modular and extendable — but the extension module sizes differ between models, and this affects how you plan your initial purchase.
Work through each of these in turn and the right model becomes clear.
Width is where to start, because it is the constraint most buyers can least change. Your garden has a certain amount of space. The greenhouse has to fit in it, leave room to walk around the outside, and ideally face the right direction.
The most productive orientation in the UK is with the longest side facing south, maximising sun exposure through the growing day. If that is not possible in your space, east-facing is preferable to west-facing, and west-facing is preferable to north-facing — though any position will grow crops productively if it receives at least five to six hours of direct light daily.
When measuring your available space, allow at least 50cm on each long side for access and ventilation, and at least 1m at each end for door clearance and comfortable entry.
Recommended for: Small gardens, narrow side passages, balcony edges, compact first greenhouses.
The KLASIKA SLIM is the most compact option in the range — 2m wide and 2.10m at the ridge — and it is specifically designed for gardeners who do not have space for a standard-width greenhouse or who want a smaller, focused growing space.
At 2m wide, the internal growing area is more modest than the wider models. There is room for a single bed down one side and a narrow path, or two very slim beds with a central path — this suits a tidy, focused growing setup rather than large-scale production. Where the KLASIKA SLIM earns its place is in situations where no other model would fit: a narrow side alley between house and fence, a compact urban garden where every square metre counts, or a first greenhouse purchase for someone who wants to learn before committing to a larger structure.
The SLIM starts at a base length of 2m and extends in 2m modules, so a buyer who starts with a 2×2m greenhouse can extend it to 2×4m, 2×6m, and so on as space and ambition grow.
It does not include a foundation skirt — the arches anchor directly into the ground approximately 35cm deep — which keeps assembly straightforward on most garden surfaces.
Key specs at a glance:
Recommended for: Gardeners who want an apex roof aesthetic, those growing tall crops like indeterminate tomatoes, and buyers who value the full use of the internal footprint.
The 2.35m house-shaped models are the most structurally efficient in the range in terms of usable floor area per square metre of footprint. An apex or house-shaped roof rises steeply from the eaves and peaks at the ridge, meaning the internal volume is almost entirely accessible rather than tapering away at the sides as it does in a rounded arch. You can stand at the edges of a house-shaped greenhouse. You can use the full width for beds or staging right to the walls.
At 2.35m width, these models comfortably accommodate two growing beds with a central walking path — a layout that is particularly practical for growing two different crops side by side (for example, tomatoes on one side and cucumbers on the other), or for staging and shelving on one side with ground planting on the other.
The house shape also suits gardens where aesthetics matter. The pitched roof and vertical side walls give a more traditional, cottage-garden character than a rounded tunnel, making it a natural fit for walled gardens, kitchen gardens, and settings where the greenhouse is a visible feature.
There are two models at this width, and the choice between them comes down to a single key variable: whether you want a foundation skirt, and how fine-grained you want your extension options to be.
The KLASIKA HOUSE includes a 10cm steel foundation skirt as standard — a continuous perimeter base that provides a soil-containment edge, a clear ground-level boundary between inside and outside, and additional structural stability at the base of the greenhouse. For buyers who want to create a defined internal floor — whether paving slabs, gravel, or soil beds — the foundation skirt makes this straightforward and neat.
The KLASIKA HOUSE starts at a base length of either 2.12m or 3.17m and extends in 2m modules. The two starting lengths give flexibility for plots where an even-numbered metre length would not fit as well.
The arch spacing on the KLASIKA HOUSE is 50cm — the tightest in the range — which contributes to a particularly solid, rigid structure.
Key specs at a glance:
The KLASIKA BERNARD is the newer addition to the house-shaped family — the same 2.35m width and 2.35m ridge height, the same practical internal shape, but with two meaningful differences from the KLASIKA HOUSE.
First, it does not include a foundation skirt. This suits buyers who are placing the greenhouse on an existing hard surface — a patio, a prepared concrete base, or pre-laid paving slabs — where a skirt is unnecessary and its absence simplifies both installation and the eventual repositioning of the structure if needed.
Second, its extension modules are 1m rather than 2m. This is a significant practical advantage for buyers who want precise length control — you can build a KLASIKA BERNARD at 2m, 3m, 4m, 5m, and so on, rather than being limited to even-numbered lengths. For gardens where an odd-metre length would make better use of available space, this flexibility is genuinely useful.
The KLASIKA BERNARD also has wider arch spacing at 99cm, giving a more open internal feel for the same footprint.
Key specs at a glance:
Recommended for: Gardeners wanting a distinctive teardrop profile, those who need significant internal height, and buyers for whom maximum interior volume is a priority.
The 2.5m teardrop-profile models are the tallest in the range. The STANDART KLASIKA reaches 2.45m at the ridge — the greatest internal headroom of any model — making it the natural choice for growing very tall indeterminate tomatoes, climbing cucumbers trained to significant height, or any crop where vertical growing space matters. If you have ever lost the top of a tomato plant to a too-low greenhouse ridge, the STANDART KLASIKA solves that problem.
The teardrop or drop-shaped profile also creates a distinctive visual character — narrower and steeper than a rounded arch, with a sharper apex — that suits certain garden styles very well. It reads as purposeful and well-proportioned, and the slightly narrower base compared to the arched 3m models means it can fit into spaces where a full 3m width would not.
At 2.5m wide, there is comfortable room for two growing beds with a generous central path, or for one wide bed with staging along one wall. The extra width over the 2.35m house-shaped models is useful but not dramatic — the more significant difference is the height.
The STANDART KLASIKA is the original and most complete version of the teardrop profile. It includes a 10cm steel foundation skirt, giving a defined base perimeter and soil containment, and incorporates sunroofs as standard — the number of which depends on the greenhouse length. This is the only model in the range that includes sunroofs as a standard feature rather than an optional addition, making it particularly well-suited to gardeners who know they will need active ventilation management in summer.
Arch spacing is 67cm — close-set for a rigid, solid structure — and the base starts at 2m or 4m with 2m extension modules.
Key specs at a glance:
The KLASIKA DROP shares the teardrop profile of the STANDART KLASIKA but is positioned as the more accessible entry point to this shape family. It does not include a foundation skirt, and sunroofs are ordered as optional additions rather than being included as standard.
Arch spacing is wider at 100cm, which gives a more open feel internally and reduces the overall weight of the frame — appropriate for buyers placing the greenhouse on a prepared surface where the perimeter skirt is not required.
The KLASIKA DROP starts at a 2m base and extends in 2m modules, making it a natural choice for buyers who want the teardrop shape and height of this profile family but prefer to manage their own base arrangement.
Key specs at a glance:
Recommended for: Serious growers, those wanting maximum growing space, buyers who will use the greenhouse as a principal food-growing structure.
At 3m wide, the arched models are the workhorses of the range. They provide the greatest internal footprint of any model, comfortably accommodating two generous growing beds on either side of a central path wide enough to work in comfortably — typically a 70–80cm path with approximately 100cm beds on each side, or raised seedbed sets of the dimensions designed specifically to fit the 3m interior width.
The structural strength of a steel-framed galvanised greenhouse at 3m width is significant. The frame can support the full weight of the glazing, snow load on the roof, and any internal equipment — shelving, hanging baskets, plant binding systems, irrigation pipework — without compromise. The galvanised steel profiles are strong enough to tie climbing tomatoes, cucumbers, and beans directly to the frame, which is one of the most practical advantages of a steel structure for this type of growing.
Four models are available at 3m width, and the differences between them are meaningful.
The KLASIKA ARCHED is the flagship of the range — the most complete, fully specified 3m greenhouse. It includes a 10cm steel foundation skirt, 67cm arch spacing for maximum structural rigidity, and 2.18m ridge height that provides ample working headroom.
The omega-profile arches are closely spaced at 67cm, giving this model excellent resistance to wind racking and snow load — the right choice for exposed garden positions or sites in regions with heavier winter snowfall. The arches anchor 35cm into the ground, and the foundation skirt provides perimeter integrity and soil containment.
This is the model for buyers who want the best-specified 3m greenhouse — maximum structural rigidity, a defined base, and the confidence of a fully engineered growing structure designed to perform for the full length of its 10-year panel warranty and beyond.
Key specs at a glance:
The BALTIC LT is one of the most popular greenhouses in the entire range — and its popularity is well-deserved. At 3m wide and 2.10m ridge height, it delivers the full benefit of the 3m growing width in a slightly lower-profile structure that works well in gardens where visual bulk matters or where planning considerations favour a lower ridge height.
The BALTIC LT does not include a foundation skirt — the arches anchor directly into the ground — which suits buyers placing the greenhouse on level ground, grass, or prepared soil where a perimeter skirt would add complexity without benefit. Arch spacing is 100cm, giving a slightly more open internal feel than the closely-spaced KLASIKA ARCHED while still providing a robust and stable structure.
For buyers who want the serious growing capacity of a 3m-wide greenhouse at the most accessible price point in this width category, the BALTIC LT is the natural answer. It offers excellent price-to-quality ratio without compromising on the fundamentals — galvanised steel frame, Brett Martin polycarbonate panels, CE-certified construction.
Key specs at a glance:
The KLASIKA TUBE is the 3m model that stands apart from the others in the range through its square tubular profile — 20×20mm square steel tubes rather than the omega profile used across the rest of the KLASIKA family. The arches are connected using a special KRAB clip system rather than screwed joints, creating a framework of distinct structural character.
The square tube profile gives the KLASIKA TUBE a noticeably different visual quality — the clean lines of square section steel are more angular and contemporary than the pressed omega profile, and the KRAB system means cleaner-looking joints throughout.
Structurally, the KLASIKA TUBE is a highly rigid greenhouse. The foundation skirt is included as standard, arch spacing is 67cm, and ridge height is 2.18m — matching the full specification of the KLASIKA ARCHED. For buyers who appreciate the square tube aesthetic, or who want the distinctive character this model brings to a kitchen garden or formal growing area, the KLASIKA TUBE is an excellent choice.
Key specs at a glance:
The KLASIKA EASY is the newest addition to the 3m family — specifically designed around an assembly experience that is faster and more accessible than any other model in the range. Like the KLASIKA TUBE, it uses a square tubular profile (20×20mm), but the connecting system is designed for rapid tool-minimal assembly: the tubes connect using a dedicated fitting that allows quick, secure joins without welding or complex tooling.
For buyers who are building their greenhouse alone, or who want the simplest possible assembly process, the KLASIKA EASY delivers the full growing capacity of a 3m greenhouse with a notably more straightforward build experience. It does not include a foundation skirt, and its arches are driven into the ground at 67cm spacing — close enough for good structural rigidity, quick enough to assemble efficiently.
Key specs at a glance:
Once you have identified the right width for your space, the shape question often resolves itself — but it is worth thinking through deliberately.
Arched/tunnel profile (KLASIKA ARCHED, BALTIC LT, KLASIKA EASY, KLASIKA SLIM): The rounded arch is the most space-efficient shape per unit of steel, and the curved profile sheds rain and snow naturally. The trade-off is that internal headroom tapers toward the side walls — you will stand comfortably in the centre but crouch slightly at the edges. This is a minor issue for most growing tasks and not a concern at all if you are working primarily with beds.
House/apex profile (KLASIKA HOUSE, KLASIKA BERNARD): The pitched roof and vertical side walls maximise usable volume. You can stand upright at any point inside the greenhouse, which matters if you are working in it regularly. The shape also suits certain garden aesthetics more naturally.
Teardrop/drop profile (STANDART KLASIKA, KLASIKA DROP): The steepest internal profile of the three. Maximum ridge height for the width, excellent self-draining roof geometry, and a distinctive visual character. The tall, narrow peak is particularly suited to growing very tall crops.
Square tube profile (KLASIKA TUBE, KLASIKA EASY): These are the only models with a non-omega frame profile. The clean square section steel gives a different aesthetic quality to the greenhouse interior and exterior — more angular and contemporary. The structure is equally strong; the choice is partly functional and partly visual.
This question is more practical than it might appear.
Models with a 10cm foundation skirt included: KLASIKA ARCHED, STANDART KLASIKA, KLASIKA HOUSE, KLASIKA TUBE.
Models without a foundation skirt: BALTIC LT, KLASIKA BERNARD, KLASIKA DROP, KLASIKA SLIM, KLASIKA EASY.
The foundation skirt matters in two situations. First, if you are placing the greenhouse on open ground and want to create a defined internal boundary — preventing soil from spilling out, keeping grass and weeds from creeping in underneath, and giving a clean finished edge to the greenhouse perimeter. Second, if you want to lay an internal floor surface — gravel, paving, or bark path — that is contained by the perimeter.
If you are placing the greenhouse on an existing hard surface — paving, concrete, decking — the foundation skirt is largely unnecessary. The hard surface already provides the boundary and containment function, and the skirt would simply sit on top of the paving. In this case, one of the foundation-free models is typically more practical.
If you are placing the greenhouse on grass or bare soil and want a neat internal arrangement, a model with a foundation skirt makes setup easier and looks more finished.
Every model in the range is designed to be extended — this is one of the most buyer-friendly features of the KLASIKA and BALTIC LT range and one that is genuinely worth planning for at the point of purchase.
Standard 2m extension modules are available for all models except the KLASIKA BERNARD. This means a greenhouse can grow in 2m increments: 2m, 4m, 6m, 8m, and so on.
1m extension modules are unique to the KLASIKA BERNARD, allowing increments of 1m and making odd-metre lengths — 3m, 5m, 7m — straightforward rather than requiring a custom solution.
The practical advice: buy a greenhouse that fits your available space now, but buy the frame size that will still be the right width in five years when you want more length. Width cannot be changed by extension — it is fixed by the frame you buy. Length can always be added. If you are choosing between a 2m-wide slim model that fits your current space and a 3m-wide model that would require some preparatory work to the garden, the 3m model is almost always the better ten-year decision.
Garden: Small city or suburban garden, limited footprint, perhaps a side passage or compact rear garden. Growing goals: Year-round salads, early tomatoes, overwintering herbs and tender plants. Recommended model: KLASIKA SLIM — the only 2m-wide option in the range, purpose-built for tight spaces. Start at 2×2m and extend to 2×4m when you catch the growing bug.
Garden: Medium suburban garden, grass or prepared bed area, wants the best combination of growing space and sensible investment. Growing goals: Tomatoes, cucumbers, peppers, early seed starting, extended season. Recommended model: BALTIC LT — the range’s best price-to-performance greenhouse at 3m wide. No foundation skirt means clean, straightforward installation on grass or prepared ground. Excellent structural quality at the most accessible price in the 3m category. Start at 4m base and extend later.
Garden: Dedicated growing area, committed to maximising production, wants a structure that matches the ambition. Growing goals: Full-season tomatoes, cucumbers, aubergines, year-round salads, propagation from January, overwintering tender crops. Recommended model: KLASIKA ARCHED — the fully-specified 3m flagship with foundation skirt, 67cm arch spacing, and maximum structural integrity. Pair with 6mm Brett Martin panels for the best thermal performance. Plan the length based on your growing list: tomatoes and cucumbers alone warrant a 6m minimum.
Garden: Kitchen garden, walled garden, or any setting where aesthetics and structure quality both matter. Growing goals: Productive growing with a structure that looks as good as it performs. Tall crops, full standing headroom throughout. Recommended model: KLASIKA HOUSE — house-shaped profile with 2.35m ridge height, 10cm foundation skirt, and 50cm arch spacing for a solid, well-proportioned structure. The tightest arch spacing in the house-shaped family gives this model a satisfyingly substantial feel. Choose the 6mm panel option.
Garden: Any size, but with an available length that doesn’t divide neatly into 2m increments — or simply someone who plans to extend gradually. Growing goals: Flexible and expansive growing space that can grow alongside ambition. Recommended model: KLASIKA BERNARD — the only model in the range with 1m extension modules, allowing any length in 1m steps. Same 2.35m house shape, no foundation skirt for clean placement on a hard base. Ideal for carefully measured plots.
Garden: Any size with adequate headroom clearance, growing indeterminate tomatoes or very tall cucumbers. Growing goals: Maximum headroom — growing varieties that reach 2m+ and do not want to be pinched out prematurely. Recommended model: STANDART KLASIKA — the tallest greenhouse in the range at 2.45m ridge height, with sunroofs included as standard. The teardrop profile channels vertical space to maximum effect. Everything about this model is designed for the serious grower of tall crops.
Garden: Modern garden design, or any setting where the square-section steel aesthetic of a tubular frame suits the surroundings. Growing goals: All standard growing applications, with the addition of a frame aesthetic that is more angular and structured than the omega profile models. Recommended model: KLASIKA TUBE — square tube 20×20mm profile with KRAB connection system, 10cm foundation skirt, and the same CE-certified galvanised steel specification as the rest of the range. Visually distinctive, structurally excellent.
Garden: Any size, but solo build or minimal DIY experience. Growing goals: A quality 3m greenhouse without the complexity of a multiple-fastener assembly process. Recommended model: KLASIKA EASY — the newest model in the range, designed specifically for fast, accessible assembly using a quick-connect tube system that requires no welding and minimal tooling. Full 3m width, Brett Martin polycarbonate panels, and the same galvanised steel quality throughout.
Whatever model you choose, buy the longest greenhouse that fits your space and budget. Every experienced greenhouse grower says the same thing: they bought too small the first time, and they wish they had started bigger. The plants always expand to fill the space — and beyond.
Length is the one dimension you can always add. Width cannot be changed. If you are hesitating between a 3m × 4m greenhouse and a 3m × 6m greenhouse, choose the 6m. If you are hesitating between the 2.35m-wide KLASIKA HOUSE and the 3m-wide KLASIKA ARCHED, and your garden can accommodate either, choose the 3m. The regret of too little space arrives in the first season. The value of extra space compounds across every growing year that follows.
4mm or 6mm polycarbonate? A practical guide to choosing the right panel for your greenhouse
Our team is here to help you find the perfect growing solution.
