Call us on 01760 444 229
Van, Delivery & Installation included Delivery & installation included
Van, Delivery & Installation included
Delivery & installation
10-year guarantee
10-year guarantee
for peace of mind
50 Years Experience
Over 50 years'
Handmade to Order in Norfolk
Handmade to order
in Norfolk

Thornham Summerhouse

2.4 x 3.0m Thornham Summerhouse Pebble 3.0 x 4.2m Thornham in Exterior Sage 2.4. x 3.0m Thornham Summerhouse in Sage Holkham Hero4 Arts & Crafts Room - Interior image

With a modern-style pent roof, the Thornham stands apart from our other summerhouses, especially if you are looking for a contemporary design.

Whether you would like a simple summer refuge or a year-round garden office space, plenty of glazing will allow an abundance of natural light inside, and the roof overhang adds a touch of style.

To create your own Thornham Summerhouse, please click on the Create my Summerhouse tab below. 


Design your Summerhouse

Our aim at Crane is to help our customers to create a summerhouse that is perfect for their garden in terms of both looks and usability. That is why you can choose the style of window, the cladding type, whether you want double glazing and electrics, and a host of other options to suit your needs, because we make each building to order. 

We want you to be inspired to create your own Summerhouse, which you can do by clicking the Create My Summerhouse tab, and if you have any questions in the process, just call us or send us an online enquiry. 

Building Sizes

Our Thornham Summerhouses are available in a range of sizes.

From 1.8 x 2.4m (6 x 8ft) to 3.6 x 6.0m (12 x 20ft) and plenty of sizes in between.

For more bespoke sizes please call us on 01760 444229 to enquire.

Paint Options

Our Thornham Summerhouses come treated with light oak wood preservative as standard, which protects the timber from fungi and woodworm and gives the timber a natural looking sheen. We also offer two paint ranges to choose from: these are Exterior and Farrow & Ball to give the best possible paint options for your building.


Paint Range

  • High quality exterior paint.
  • Weather resistant and protective.
  • Fully opaque 2 coat system.
  • Inspired by nature and the soft neutral tones of traditional colonial buildings.




























Farrow & Ball

Exterior Paint

  • High quality exterior paint.
  • Water resistant and anti-fungal.
  • Rich, fully opaque colour.
  • Specially selected colours from the Farrow & Ball paint collection.


Green Smoke

Green Smoke

Old White

Old White

French Gray

French Gray

Light Gray

Light Gray

Mouse's Back

Mouse's Back



Manor House Gray

Manor House Gray

Down Pipe

Down Pipe



Roofing Options

The Thornham comes with a choice of roof covering: heavy duty felt is the standard option, and you have the choice of upgrading to an incredibly durable EPDM rubber roofing material. 

Heavy Duty Felt

This is our standard roofing material: it is an extreme wear, heavy duty, 35kg green mineralised felt that is a non-rip material and is applied with a propane torch to increase its longevity.

EPDM Roofing

For further durability, you can upgrade to our EPDM rubber roofing. EPDM is a rubber-based roof covering that is glued to the roof, and is manufactured in one piece, meaning there will be no joins, highly reducing the risk of leakage.

Lining & Insulation

The Thornham Summerhouse comes unlined as standard to create a purely summer use building, but you can choose to have the walls and ceiling lined and filled with insulation. This makes it a perfect all-season retreat and greatly enhances the finished look of the building, increasing comfort and decreasing noise levels. 

You can also choose to have the floor insulated, as an extra option. 


For the roof we have a 4 tier lining and insulation process; we insulate between the roof and the internal matchboard tongue and groove lining, and finish the building with heavy duty felt. For the walls, we insulate your building by trapping a breathable paper membrane between the studwork, which acts as a moisture trap before filling in with insulation. 

There are then 2 options for lining your Summerhouse: natural matchboarding, or painted matchboarding. To have the interior painted, you can choose our own Ivory internal paint colour, or choose from a range of 8 Farrow & Ball paint colours. There is also the option to have the ceiling painted.


This is the standard option, to give you a building to use just in the summer months.

Natural Matchboard Lining

We can line with our highest grade solid pine tongue and groove matchboarding (15mm) offering a natural, warm feel.

Painted Matchboard Lining

We use a channelled, secret-nailed, tongue and groove matchboarding (15mm) with 3 coats of Ivory or Farrow & Ball paint, which achieves a bright, clean and airy look.

Year Round Use

If you choose to have full insulation, along with the matchboard lining and double glazing, you will be able to use your building in comfort all through the year.

Interior Colours

Our Thornham Summerhouse is unlined as standard, but you can upgrade to natural matchboard lining or painted matchboard lining in either our interior Ivory or in a choice of 8 Farrow & Ball colours. 

The Farrow & Ball colours have all been specially chosen to contrast pleasingly with our external paint colours, and will allow you the flexibility to choose a neutral colour, or a shade with a bit more colour to it to really bring the inside of your summerhouse alive. 

These colours become particularly special when they are paired with one of our four engineered flooring types. 

Pointing | Slipper Satin

Ammonite | Elephant's Breath

Shadow White | Old White

Purbeck Stone | Manor House Gray

Farrow & Ball Shadow White paired with Heritage Oak engineered flooring

Wall & Ceiling Colour Combinations

As well as choosing a paint colour from our selection of interior colours for the walls, you can also choose to have your ceiling painted. You can choose the same colour for the ceiling as the walls, or if you would like to add an extra splash of colour, you can choose a seperate, contrasting colour. 

For the Thornham, these are our favourite Farrow & Ball colour combinations: 

Neutral = Walls - Shadow White + Ceiling - Pointing. Engineered flooring suggestions - Shade Oak, Heritage Oak, Dark Oak.

Warm Neutral = Walls - Old White + Ceiling - Pointing or Slipper Satin (depending on the level of contrast you want). Engineered flooring suggestions - Shade Oak or Dark Oak. 

Warm Grey = Walls - Elephant's Breath + Ceiling - Slipper Satin. Engineered flooring suggestions - Shade Oak or Heritage Oak. 

Manor House Gray walls and Ammonite ceiling

Elephant's Breath walls and Natural ceiling

Ivory painted walls and ceiling

Floor Options

Our standard (ex 19mm thick) and robust floorboards are set on closely spaced tanalised floor joists, but we can also offer heavy duty (ex 38mm thick) flooring if you are planning on storing particularly heavy items or if there's going to be a lot of movement inside your new Garden Building.

As well as choosing between floorboard thickness, you can also choose to have either a lacquered finish on your floor, or you can add engineered flooring.

Lacquered Floor

Having a lacquered floor is an additional option that can be chosen with our Summerhouses. The lacquer is applied to the floorboards in either Natural or Light Oak to help protect the timber, as well as giving it a nice sheen.

Engineered Flooring

This option can be chosen as an alternative to a lacquered floor. There are four different colours to choose from, and the engineered flooring offers a chance to further personalise your new garden building, whether you’re aiming for a traditional, rustic or contemporary style. 

Our engineered floorboards sit on top of the existing floorboards, with a layer of underlay in between the two, providing further insulating and sound absorbing benefits.

Heritage Oak Engineered Floor

Dark Oak Engineered Floor

Shade Oak Engineered Floor

Chalk White Engineered Floor

Natural or Light Oak Lacquered Floor


All our buildings require a level, solid concrete base of the correct size.

The single most important part of installing a garden building is the base. Bases must be:

  • Level within a 6mm tolerance to ensure the longevity of your building
  • Of the correct size (please follow the base plan we send you)
  • Square i.e. have right angled corners

A concrete base supports your building in the best possible way, adding longevity, as well as creating a substantial distance between your building and surface water.

Concrete base in a customer's gardenWe can supply a 100mm deep reinforced concrete base ready for your building, laid by our professionals, in advance of your building being installed by us. The site must be clear and level within 100mm for us to do this.

The base should always be a minimum of 50mm out of the ground to prevent surface water or puddles affecting your building i.e. rotting it.

The base you have must be made to the plans we give you when you order your building, whether we install the base, or you get a trusted builder to do it for you. 

Bases for larger buildings, and in particular garages, need to be built to exact dimensions - we create special base drawings for our garages, since they sit directly on the concrete base and must be anchored into place.

Please note: If you intend to fully or partially surround the building base with hard paving we strongly suggest the installation of a French drain between the paving and base to prevent rain bouncing off the hard surface and driving up under the building, which in turn could cause damp and rot. A French drain is a simple small trench, dug around your building and filled with aggregate that will allow surface water to drain away.

Always get your garden building base laid by a professional, whether that is us, or a local builder you trust.

We constantly strive to ensure all our materials and techniques are the best that we can source and provide. We lead the market in producing exceptional quality timber buildings. Couple this with our personal and bespoke service and you will be totally delighted with your building.

Side Walls - ex 19 x 125mm shiplap or weatherboard cladding on ex 38 x 75mm planed framing, all using high grade Scandinavian Redwood. 

Doors - 1 pair of joinery-made double doors 1830mm high x 1100mm wide, 3/4 glazed with 4mm leaded, toughened safety glass, fitted with a mortise lock and polished brass or chrome fittings.

Door Frame - ex 75 x 75mm planed. 

Windows - 2 or 4 sets of fixed windows fitted with 4mm toughened safety glass in the front gable and 1 set of double, opening windows on each side. With joinery made frames and finished in polished brass or chrome furniture.

Floor - ex 19 x 125mm tongue and groove floorboards on ex 38 x 75mm tanalized planed floor joists set at no less than 450mm centres.

Roof - ex 19 x 125mm tongue and groove match boarding, on ex 38 x 75mm planed framing covered with mineralised 35kg roofing felt.

Height - 2.0m to eaves.

Electric Pack - The electric pack is an extra option, but if you choose it, it will consist of 4 double 13 amp switched MK sockets, a gang light switch, a waterproof double external 13 amp MK socket, an 8 way consumer unit: the main switch takes 2 slots - 63 amp MCB - 16 amp and 6 amp blanks, spotlight sets are fixed into the ceiling of all our Thornham Summerhouses, and there is also the option of having a thermostatic 2kva wall heater.

Paint - Externally, your Thornham will come in our Light Oak preservative, which protects the timber from fungi and woodworm, or you can choose between two paint systems: Exterior or Farrow & Ball. Both paint systems offer an opaque coverage and have long re-decoration cycles with a wide range of natural colours to choose from. For more information, please see the Paint Ranges section on the Options tab.

Our experienced and professional fitting team deliver and install all our buildings to anywhere on the UK mainland free of charge.

As our business is very much dependant on our reputation in providing an excellent product and service, our customer care is exceedingly important to us and you will find that we very much pride ourselves on this. From the design stage, right through to installation, providing the best possible service is our number one priority.

Crane Garden Buildings delivery vans, ready to deliver and install your bespoke timber building

Each building we make is designed and built to order, which means that we can make the building in such a way that it will fit through restricted access areas and be installed exactly where the building is required; however, if you have any concerns about the access to your garden, please contact us and we will be able to advise you.

Please also note that our installation team requires a flat, solid and level base to install your building on. If you have any questions about this at all, we will be more than happy to help if you call us on 01760 444229.

29 Customer reviews

Our Customers Have Rated Our Thornham Summerhouse

4.6 Out Of 5 Stars

Looking for a different roof shape?

Take a look at our Holkham 


Looking for an octagonal design?

Take a look at our Wiveton 


Looking for a traditional shape?

Take a look at our Cley


Would you like a corner summerhouse?

Take a look at our Weybourne 


Would you like a veranda?

Take a look at our Morston 


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