Castle Dunbar Greenhouse

Castle Dunbar 4ft 3in x 8ft 4in

The Castle Dunbar is a fantastic greenhouse where space is limited. At 4'3" wide, and with lengths available up to 12'4", it is ideal for smaller gardens. The double doors give ample access over the low threshold. This is a unique design which avoids the trip hazard of a metal base plinth found on many other types of small greenhouse.

The Dunbar has a range of other features as standard that you don't normally find...for instance it has a door lock, tubular bracing at the ridge for additional strength, diagonal bracing on the sides and the roof to keep it square and sturdy, and high eaves which make it a comfortable greenhouse for taller gardeners too! The downpipes are a standard feature which are generally an additional cost item with other greenhouses on the market.

Exclusively available from GBC in either plain aluminium finish or 'Old Cottage Green' coloured finish, please click on the 'where can I see one' tab on this page to find out where your nearest display site is.

Check out our package deals or follow the links through to buy this building on-line today.

Castle Dunbar 4ft 3in x 2ft 3in

This Castle Dunbar, shown in the 'Old Cottage Green' coloured finish, is the smallest size at only 2ft 3in deep. This is perfect for the smaller garden where space is limited, but you still want somewhere to grow those delicious herbs and vegetables throughout the year.

Dunbar 4'3 x 4'3 with integral staging

This 4'3 x 4'3 Dunbar in plain mill finish has a number of optional extras inluding the new Chartley integral staging and shelving.

In addition it has toughened safety glass, automatic vent opener, and a five blade louvre window

Chartley integral staging in mill finish

This built-in staging is a simple way to make best use of your greenhouse as it's designed specifically for the Castle range. You can adjust the height at the time of installation to suit you.

Shown here in plain mill finish  it's also available in 'Old Cottage Green'.

Chartley integral staging in green finish

This built-in staging is a simple way to make best use of your greenhouse as it's designed specifically for the Castle range. You can adjust the height at the time of installation to suit you.

Shown here in green it's also available in plain mill finish.

*Please note - all green finish buildings are now supplied in 'Old Cottage Green'. The previous 'Classic Green' colour has been discontinued*

Dunbar 4'3 x 4'3 in green

A very smart 4 x 4 Dunbar set in this pretty garden makes an attractive focal point

Pictured here with optional toughened safety glass, louvre window and freestanding staging.

*Please note - all green finish buildings are now supplied in 'Old Cottage Green'. The previous 'Classic Green' colour has been discontinued*

Dunbar 4'3 x 4'3 with integral staging

This 4'3 x 4'3 Dunbar has a number of optional extras inluding the new Chartley integral staging and shelving. In addition it has toughened safety glass, automatic vent opener, and a five blade louvre window.

*Please note - all green finish buildings are now supplied in 'Old Cottage Green'. The previous 'Classic Green' colour has been discontinued*

Dunbar 4'3 x 6'4 in green

Our customer writes:

'I had some concerns that the 6 x 4 greenhouse would be too small for my purposes (I'm an allotment holder). However, I was wrong. The greenhouse is excellent, both in usage and build quality.

A couple of points to mention, firstly, your delivery driver was helpful and informative about the company, taking the trouble to ensure that everything needed to build the greenhouse was there. Secondly, the men who I employed to build the greenhouse were also first class.

Thanks again to your company for the service and a good quality product.'

November 2013

*Please note - all green finish buildings are now supplied in 'Old Cottage Green'. The previous 'Classic Green' colour has been discontinued*

Double box section corner bars

The Castle range is sturdy, strong and will last a lifetime. Part of the reason for its strength is illustrated here - the corner bars ( uprights and eave slopes ) have a double box section arrangement which adds a huge amount of rigidity to each profile.

Compare this to the cheap aluminium framework on other greenhouses which may fold up in bad weather conditions.

Low threshold entry

Walk into most other suppliers' greenhouses and you'll have to step over a base plinth which restricts your ease of entry. This is because their metal bases are sold as an extra item for your greenhouse frame to sit on top of.

Not so with our Castle greenhouses where an integral 4 inch ( 100mm ) high base plinth is provided as part of the kit. This is suitable to install on any firm, level area. In the doorway, however, we use a threshold plate at ground level so that the doors are taller and you can walk in without restriction. This is a far better design feature than most other suppliers.

Shown here on a single door Castle greenhouse, the principle is just the same with our double door models.

Door lock

In this day and age, when garden tools and equipment cost so much ( not to mention the value of your plants ) it's important to provide some basic security with your greenhouse.

This lock is a standard feature of this model and is supplied with two keys.

Rainwater pipes and outlets

All that precious rainwater going to waste ?

Castle greenhouses have a downpipe set as a standard feature, something found generally on only the more expensive greenhouses.

Freestanding greenhouses have two stop ends for the integral gutters, two 90 degree outlets, downpipes, retaining clips and a 45 degree knuckle to turn the pipe towards a barrel ( not included ) or just to direct the water away from the framework.

Lean-to models have one downpipe and the associated components.

You will need to provide adequate storage vessels ...plastic barrels for instance. At GBC we can supply these for you, just ask for details of prices!

Tubular roof braces

Castle greenhouses have diagonal bracing in the sides and roof to keep the framework square and sturdy but they also have additional tubular roof bracing which gives extra strength and rigidity to the whole structure.

Roof vents and automatic openers

All of our Castle greenhouses include at least one manually operated roof vent and, the bigger the greenhouse gets the more we supply !  Our catalogue details how many are supplied with each model but, if you feel you need more, this isn't a problem either as we can add additional vents on most sizes.

The picture shows an automatic opener which can be supplied at additional cost.

Automatic vent openers come in many shapes and sizes but the 'Classic' shown is a good,sturdy and well proven opener.

Imagine getting up on a hot summer morning to find everything in your greenhouse has keeled over from the heat ... this is what an automatic opener will help prevent.

As the temperature rises the roof vent will open to ventilate the greenhouse and protect your valuable plants.

5 blade louvre window

An optional, and very useful, accessory is our Castle 5 blade louvre window which is glazed with toughened safety glass.

We recommend fitting them at a low level to draw air up through the greenhouse roof vents thus preventing stale air causing mildew..

Automatic openers are available, also at an additional cost, for the louvre window(s).

Available in plain mill aluminium finish or in 'Old Cottage Green'.

Nut caps

Every detail of the Castle Greenhouse range has been carefully thought out to ensure the greenhouse performs well and looks good.

One of the finishing touches which you'll generally see only on much more expensive buildings are the nut caps as pictured. ( a standard feature with Castle models )

These are in white on the aluminium finish models and black on the green ones.

Castle staging

Castle staging is available to fit all models in the range or, given that is freestanding, it can be used in any greenhouse or other garden building.

Four widths are available : 12" (31cm) , 18" (47cm),  24" ( 57.5cm) and 30" ( 75cm)

We have a choice of two tier (31", 77 cm high )or three tier (37", 93 cm high )in each width.

Framework can be mill finish as pictured or 'Old Cottage Green'.

2ft (57.5cm ) and 4ft ( 113.5 cm ) long packs are available for the 3 smaller widths. The 30" wide staging is available 4ft long only.

Using a combination of different lengths and widths you can optimise the use of the space inside your new greenhouse.

If bought at the same time as your new Castle or Peak greenhouse there is no delivery charge but if you wish to buy the items separately there will be a small charge to pay per delivery.

Bar capping optional upgrade

The pictures here illustrate the option of PVC bar capping which is available in green or white.

It replaces the stainless steel clips which are the normal method of securing the glass.

It makes cleaning much easier and keeps the glass very secure in the framework.

Winter Insulation

Insulating aluminium greenhouses to retain heat for overwintering tender plants and starting off new seedlings can be accomplished by using bubblewrap. This is usually pegged to the frame on the roof as well as the sides and gables but a customer sent in this picture of his solution to the pegging problem :

I have fixed the bubble insulation using three lengths of 13mm aluminium tube cut to length and suspended at the ends from the roof. The bubble wrap then just feeds up and over and down in one piece. It doesn’t require any pegging at all. It then just requires about eight pegs only, to fix the cut and shaped two end pieces. The tube can remain insitu throughout the year .

His building is a 6 x 5 Castle Balvenie but the principle would apply for any other model. Don't forget to disconnect autovents before you fit the bubblewrap or you'll lose all that lovely warm air !

Waterbutt and stand

This is a great way to conserve precious rainwater. Castle greenhouses have a built in gutter and downpipes which can be connected to any rainwater butt.

We sell water butts in two sizes : a slimline 100litre butt as pictured or a 210litre butt. Each has an optional stand which is also shown in the picture.

The pictured greenhouse is from our Peak range which you can view on this website or at our branches.

GBC...here to help you

GBC have branches all over the country displaying our buildings and offering help and advice to our customers.
Established in 1986, we are real people with our feet on the ground and with a real investment in and commitment to our buildings.
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Please give us the opportunity to assist you in buying the building of your choice ... contact us by freephone, email, our live website chat or call our branches direct. You will find all of these contact opportunities in this website. We look forward to speaking to you