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BillyOh Expert Pent Growhouse

The BillyOh Mini Expert Pent Growhouse is perfect for smaller gardens and patios. Designed to fit down a walkway at the side of your house, or at the bottom of the garden, the dual entrance design means that you get to your plants from either end. The adaptable roof allows you to have your Growhouse lean up against another building or stand-alone. Mineral felt included with pressure treatment available.
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Discover our range of BillyOh accessories that allow you to customise your very own garden building to very last detail.

Do you need high quality padlocks, paint, silicone and assembly kits?

This multipurpose wood stain is designed to provide protection to and weatherproof all types of timber, ideal for a garden building. With a number of different colour options available you can choose the perfect colour to compliment your garden. The wood stain is high quality and can be used on all types of timber products, such as furniture and buildings.
Cost-effective and waterproof wood stain that enhances the natural beauty of the wood. It is used and recommended by professionals as, unlike a lot of competitor brands, it can be applied to old surfaces, planned (finished) and rough sawn timber.
Please note the colours are not pre-painted on the product before delivery, and are supplied in a tub of paint.
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  • 11mm strong Tongue & Groove construction
  • Adaptable roof - build a lean-to or pent
  • Dual entrance with a door at either end
  • High eaves height
  • Designed to fit down the side of the house
  • Floor and roof included as standard
  • Complete with felt, fixtures and fittings
  • Base Coat Treated for Transit
Overall Dimensions (Includes Roof Overhang)

Why buy the Mini Expert Pent Growhouse?

BillyOh <br/> Guarantee

Protects the wood against rot and decay.

UK <br/> Manufactured

Over 20 years of experience in design and production.

Complete<br/> Building

Floor, Roof, Felt included as standard.

Easy to <br/> Assemble
Easy to

Comprehensive assembly instructions and fixings included for a stress-free installation.

Key Features

Adaptable Roof Style

This mini greenhouse can be built with a pent or lean-to style roof, with a space-saving design that’s ideal for fitting down the side of the house.

Tall Design

The Mini Expert greenhouse has an internal height of 1.3m at its lowest point and 1.4m at its tallest point when built, offering ample space for plenty of plants.

Dual Entrance

Easy access in and out, perfect for organising your space, or working with a friend!

BillyOh Expert Pent Growhouse
Shatterproof Styrene Glazing

Durable Single SAN glazing included as standard. A clear durable and strong plastic, a safer alternative to traditional glass.

European Sourced Timber

Our carefully sourced timber is purposely selected to ensure dependable quality, creating a robust and reliable greenhouse.

Durable Tongue & Groove

The Tongue and Groove boards interlock with one another to form a tight seal offering high-quality weather protection.

Frequently Asked Questions


The Mini Expert Growhouse can be built in two ways.

If built as a lean-to the structure is designed to rest against the side of another structure to save space and give it support. This takes advantage of an existing structure to save you time and money over a standalone building.

If built as a pent greenhouse, the roof would be flat meaning

This mini greenhouse gets a beautiful golden brown spray treatment before leaving the factory in order to preserve the quality of the wood up until the delivery. As this only lasts through the transit stage, we do advise treating the wood after installation to protect and preserve it, as well as annual maintenance.

For an extra level of protection, you can opt for a pressure treated building which is an effective way of keeping the wood long-lasting. This is an extra step in the manufacturing process where the wood is treated in a pressurised tank. Chemical preservatives are forced deep into the wood’s fibres to resist rot, decay and termites. When you upgrade to Pressure Treatment, the guarantee is extended from 10 to 15 years.

The BillyOh Mini Greenhouse is designed with shatter-resistant plastic (SAN). SAN is used for its UV properties and the tougher finish avoids breakages when compared to the properties of glass shattering.

The BillyOh guarantee covers this building against:

Rot Decay Insect infestation

Please note: The guarantee does not cover timber splits or warping which may occur naturally over time.

For more information about BillyOh Guarantee, please visit our terms and conditions.

We do not offer an installation service on any of our buildings as our buildings are designed & made to be easy and simple to assemble. Using the assembly instruction included and with a team of just 2 people and a bit of DIY knowledge you can expect to have your mini greenhouse within 3-4 hours with some of our smaller buildings.
This mini greenhouse is delivered in easy to assemble panels. For your convenience, the panels are no wider than 4ft so they can be easily manoeuvrable and fit through a standard doorway.

More About the Mini Expert Pent Growhouse...

The BillyOh Mini Expert Pent Growhouse with Dual Entrance

The BillyOh Expert Growhouse is the perfect way to leap into insulated gardening without buying a bulky or expensive traditional greenhouse.

Perfect for gardens with limited space, the Expert Growhouse is a small outdoor greenhouse constructed with a sturdy wooden frame. The space inside is ideal for two potting benches, with large windows to let in sunlight and two openable doors to provide easy access and sufficient ventilation. The adjustable roof lets you decide whether to construct it as a free-standing structure or as a lean-to greenhouse. And, at such as small size, the Expert Growhouse is virtually maintenance-free!

The BillyOh Expert is the perfect growhouse for vegetables, fruits, vines, flowers - and anything else you might want to grow! If you've got green fingers but a small garden, then this is the perfect greenhouse for you!

Greenhouse, Growhouse, Cold Frame - What's The Difference?

We sell freestanding greenhouses made from a range of durable and high-quality materials. Across our wide range of products, you can find a regular greenhouse made from wood, aluminium, or even a polycarbonate plastic greenhouse.


Green houses are shed-like structures that allow plants that thrive in regulated conditions to grow. By controlling the temperature and atmosphere within your greenhouse - you can grow favourite plants year-round!

Mini Greenhouses

But if you want to save on space (and money!) without giving up on growing, then a wooden mini greenhouse is the perfect fit. Bigger than a cold-frame (sort of like a glass-topped box, built low to the ground), a growhouse will allow taller plants to thrive.

Made from high-quality and durable wood, the tongue and groove panels of the Mini Expert growhouse slot together to prevent water ingress. Resistant to harsh weather and winds, uncoated models will still require regular treatments - so why not opt for a pressure-treated model? Simply check the product dimensions in our handy tech specs to find the perfect size for you.

Space, Cover, and Protection for Plants

The Mini Expert Growhouse is one of our newest and most innovative protective structures, designed to provide secure cover to whatever you decide to grow!<.p>

Store Other Items

And if you've got your eyes set on more than seed trays, there's plenty of extra space to store gardening products and tools. Or, kit out your greenhouse with shelves to make the most of the vertical space.

Plenty Of Light

With toughened safety glass (made from SAN glazing) featured on each of the double doors, access is made easy and you'll have plenty of light to work by when seed planting.

A Wooden Greenhouse - The Seed of Something Great!

Open up a whole new world with a hobby that'll last you a lifetime. From growing delicate plants and harvest-to-table veggies to transplanting plant pots, the BillyOh Growhouse will be with you for years to come. In fact, we're so confident that we provide our very own BillyOh guarantee against rot, decay, and insect infestation!

Easy Assembly

Provided with easy-to-follow and comprehensive instructions, the compact design of this grow house is easily put together by two people with some basic tools. So start making the most of your outdoor space now.


With fast delivery times and free shipping at no extra delivery charge to most of mainland UK, you can get growing sooner rather than later. Simply checkout now or get in touch with our customer service team for more information about the Mini Expert growhouse.

Dimensions 8x3
Width 237cm
Depth 93cm
Width (Internal) 229cm
Depth (Internal) 85cm
Eaves Height (Inc Floor) 135cm
Ridge Height (Inc Floor) 142cm
Eaves Height (Excl Floor) 130cm
Ridge Height (Internal) 148cm
Minimum Base Width 237cm
Minimum Base Length 91cm
Features 8x3
Greenhouse Style Lean-to Greenhouse
Please Note: This product has been designed as an affordable solution to most popular light domestic uses. All products supplied self assembly flat packed unless otherwise stated.