Greenhouses That Grow with You: Our Top Picks for Every Size and Budget

If you’re looking to create the optimum growing conditions for your plants and flowers, then you’ll want to add a greenhouse to your garden wishlist. Greenhouses mean an extended growing season, turning home growing into an all-year-round hobby. They allow you to control the environment, including aspects like moisture levels, air circulation and light levels. And with a greenhouse, your plants will no longer be at the mercy of the fickle British weather.

There are lots of options to choose from, so it can be helpful to focus on key elements like size, type, features, material and cost. In this article we’ve rounded up some of our top picks for every size and budget – check them out below!

Best Mini Greenhouses

Mini greenhouses are about the smallest you’ll find on the market and can hold a select number of plants. Here at B&M Garden Buildings, our mini greenhouses are between 4’ x 2’ and 4’ x 4’ in size and offer a variety of contrasting features.

4’ x 4’ Palram Canopia Plant Inn Raised Bed Small Mini Greenhouse – £299.99*

Easy to assemble, maintenance-free and backed by a 5-year limited guarantee, this unique mini greenhouse from Palram Canopia packs a lot of features into its small frame.

An aluminium frame, galvanised steel base and polycarbonate panels combine to provide structure and durability. Two planters, ten plant hangers and a water drainage system keep the soil in optimum condition. Two adjustable lids provide easy access to your plants, and you’ll find a handy storage compartment for gardening tools and equipment underneath the planting level. And all for under £300!

4’ x 2’ Forest Wooden Mini Greenhouse – £309.99

If you prefer your greenhouses with a wooden frame, then you have to check out the Forest Wooden Mini Greenhouse. With two shelves you get loads of growing room and double doors plus independently opening lids ensure speedy and easy access. The structure itself is built from pressure-treated wood, which means it comes with a whopping 15-year guarantee against rot and decay – and there’s no need to spend precious time and money on re-treatments.

All told, you get a lot for your money with this mini greenhouse and its small footprint means it will slot neatly into any garden.

Best Small Lean To Greenhouses

Lean to greenhouses, otherwise known as wall greenhouses, are designed to be positioned next to a wall or fence line. They tend to be taller than mini greenhouses and often have a sloping pent or apex roof. Here are a couple of our top picks!

3’9 x 1’6 Forest Georgian Tall Wall Lean to Greenhouse with Auto Vent – £439.99

Slim and tall, the 3’9 x 1’6 Forest Georgian Tall Wall Lean To Greenhouse with Auto Vent has been designed to tuck neatly against a wall but also has a back panel to give you more flexibility when it comes to deciding where it should live in your garden.

The greenhouse features shatterproof styrene glazing, a lockable door that can be fitted with a right or left opening, an auto vent and two removable shelves, so that you can grow both tall and short flowers, fruit and veg with ease.

5’ x 2’ Forest Victorian Tall Wall Greenhouse – £539.99

The 5’ x 2’ Forest Victorian Tall Wall Greenhouse is equally as streamline and will bring a touch of Victorian style to your garden. You get two planting levels and a collapsible middle shelf to accommodate taller plants, while pressure-treated wood and a 15-year anti-rot guarantee ensure that this is a greenhouse you and your plants can enjoy for years to come.

Best Small Standalone Greenhouses

We start to see the classic greenhouse shape emerging with these small standalone greenhouses, which include the popular 6’ x 4’ size. There are loads that we could have chosen to include, but here are a few of our favourites to whet your appetite.

6’ x 4’ Palram Canopia Harmony Silver Polycarbonate Greenhouse – £329.99

The Palram Canopia Harmony Silver Polycarbonate Greenhouse is one of the cheapest 6’ x 4’ greenhouses that we offer (and actually, one of our best value greenhouses full-stop). For under £350, you get an aluminium frame with a galvanised steel perimeter base and polycarbonate glazing with Fine Shield Technology^TM.

If that’s not enough, you also get integral guttering, a roof vent and a lockable door that can be fitted with a left- or right-hand opening. Plus, a five-year limited warranty. Plus, it’s available in other sizes and colours too. What’s not to love?

6’ x 6’ Palram Canopia Hybrid Green Polycarbonate Greenhouse – £419.99

A step up in size, this 6’ x 6’ greenhouse from Palram Canopia is a classic green shade that will blend beautifully into any garden. The twin-wall polycarbonate roof panels and crystal-clear polycarbonate side panels are UV protected and shatterproof, and the glazing diffuses direct sunlight and provides excellent insulation for an even temperature. The greenhouse is also snow-load tested to 75kg/m² and wind resistant to 90km/hr, making it virtually unbreakable and keeping your prized plants safe!

The Hybrid series shares many of the same features as the Harmony series and is also available in multiple sizes and colours, so it’s easy to find the perfect match for you.

Best Medium-Sized Greenhouses

Medium-sized greenhouses – sometimes referred to as ‘walk in’ greenhouses – offer that balance between more planting space and a larger footprint. There are some great options available, so if you have room in your garden for 6’ x 8’ greenhouses and above, then it may be worth considering an upgrade.

4’ x 8’ Forest Wallscape Lean To Greenhouse with Glazed Back – £749.99

Part of the Forest Wallscape range, this lean to greenhouse looks great, has been built to last and is available in a variety of designs and sizes. What all these varieties share is pressure-treated wood, an excellent 15-year anti-rot guarantee, shatterproof and scratch-resistant acrylic glazing, a large opening roof vent and 12mm shiplap cladding on a 28mm frame.

And if you like the look of the 4’ x 8’ Forest Wallscape but need the door to be on the other end then you’re in luck! You can choose which end to install it on, opening up twice as many layout options.

8’ x 6’ Forest Vale Modular Wooden Greenhouse – £2,499.99

The 8’ x 6’ Forest Vale greenhouse may be the most expensive entry on this list, but you really do get a luxury product that combines premium materials with an elegant design and expert craftsmanship. The beautifully solid timber frame has been pressure treated and comes with a 15-year guarantee; the windows are made from 4mm toughened safety glass; and the greenhouse comes complete with two full-length shelves, a black press lock and an automatic opening roof vent.

Installation by professional experts is included in the price, for a premium service along with a premium product.

Best Large Walk-In Greenhouses

Greenhouses that measure 8’ x 12’ and above are a must for keen gardeners who want to spend their days inside the structure, nurturing a wide range of plants. While they may require a significant amount of space to install, in return you can fill your greenhouse with potting benches, shelving units and irrigation systems while still having plenty of room to move comfortably around. Let’s check out a few top recommendations.

8’ x 12’ Palram Canopia Balance Large Walk In Aluminium Framed Greenhouse – £614.99

The generous 8’ x 12’ Palram Canopia Balance greenhouse enjoys lots of the features that are common to Palram Canopia greenhouses, such as an aluminium frame, polycarbonate glazing with Fine Shield Technology^TM, lockable double doors and integral guttering.

In addition, extra support beams help to give the structure rigidity and two roof vents can be opened to regulate the temperature. A pair of wide double doors crown the front of the greenhouse and they, along with the low threshold, make moving a wheelbarrow in and out a breeze.

8’ x 16’ Palram Canopia Bella Large Walk In Silver Aluminium Framed Greenhouse – £1,439.00

While not quite the largest greenhouse that we offer here at B&M Garden Buildings, the 8’ x 16’ Palram Canopia Bella is certainly impressive. The eye-catching curved shape is reminiscent of a poly tunnel, but offers so much more thanks to its rust-resistant aluminium frame, galvanised steel perimeter base, and 6mm twin-wall polycarbonate roof and wall panels. Three of the roof panels include vents and the wide double doors have a padlock fixing for extra security.

If you’ve got the space, this is a greenhouse that any serious gardener would be proud to put to good use!

As you can see, there are lots of high-quality greenhouses with thoughtful features to consider here at B&M Garden Buildings. You can find our full range online, along with a great selection of grow-your-own products like planters, raised beds, potting benches and more.

Don't forget you can get free delivery** and pick your delivery date!

Have you got your eye on one of our greenhouses? Whatever size you need, we'd love to see what you'll be growing in yours! Share your photos with the B&M Community on Facebook, X & Instagram.

*Prices accurate as of 15/05/2025. **Please note that there are delivery surcharges for a few remote postcodes. T&Cs apply.