Detailed Specification

Please note: all imperial measurements are approximate and Mercia products are made from metric measurements. We would recommend that the base is at least 50mm bigger in each direction.

Product Name: 20 x 10 (5.96m x 3.06m) Mercia Premium Shiplap T&G Modular Workshop - Pressure Treated
Footprint: 5.96m x 3.06m (19'7" x 10'1")
Height to Ridge: 2.50m (8'2")
Height to Eaves: 1.79m (5'11")
Walls: 12mm Shiplap Tongue and Groove
Framing: 45mm x 28mm (2" x 1")
Door: Double Doors + extra single door
Door Opening (Height x Width): Double doors: 1.67m x 1.20m (5'5" x 3'11")
Door Lock: Hasp and Staple
Roof Type: Apex/Reverse Apex (choose at time of construction)
Roof: 12mm Tongue and Groove
Roofing Felt: Included
Floor: 12mm Tongue and Groove
Floor Joists: -
Floor Joists Direction: N/A
Window(s): 3 Opening Windows
Window / Wall Panels: Fully modular building, all panels interchangeable
Window Glazing Material: Styrene
Windowless Option Available: N/A
Treatment: Pressure Treated
Portabases Available: N/A
Manufacturer's Guarantee: 15 Year Anti-Rot Guarantee
FSC Certified: Yes
Free Delivery: Yes*
Assembly Available: Optional
EAN Number: 5029442075594
Recommended Treatment: Protek Range (please click here)
Manufacturer: Mercia


Made in the UK, from FSC® certified timber, the Mercia 20 x 10 Premium Pressure Treated Shiplap Modular Workshop is one of the largest workshops on the market. Despite its size, there has been no compromise on quality, and it provides ample room for large pieces of equipment, workbenches and tools. This size also comes with the added advantage of an extra window and an extra single door compared to the smaller sizes in this range, useful features that aid accessibility and ensure the interior is a bright, pleasant space. Boasting a unique modular design, this workshop is perfect for those looking for something a little more flexible. Whether you want to swap a window panel with the door or have both windows on one side, simply pick your desired size and construct the building in the way that suits you. This way, you can also choose whether your workshop has the traditional apex layout, with double doors located in the gable end, or you can opt for the “reverse apex” layout with your double doors located on the building’s depth. You will be able to see examples of different layouts in our product images.

This 10 x 20 colossus of a garden workshop contains enough room for a number of storage shelves, pieces of garden equipment, work benches, or supplies that can be stored outdoors. Three windows that each open make the workshop a perfect environment for working, mounted high enough on the wall to make sure there is plenty of space beneath for a work bench. The workshop’s primary set of double doors open wide and ensure that any bulky items can be easily accessed from the building. A 12mm tongue and groove construction used in its floor, roof, and all four of its walls, provides the strength and sleek appearance expected in a premium outdoor building.

When it comes to increasing your available space, it is often better to be safe than sorry. If you need to be certain you will have enough storage and workshop space in your garden building, the 10 x 20 Mercia Premium Shiplap Modular Workshop is a cost-effective solution with an excellent build quality you can trust to last.


The spectacular size of this 10 x 20 workshop is, without a doubt, its selling point. The workshop is made in the UK, using ethically sourced, FSC® certified timber. Because we understand longevity is key when it comes to investing in a premium garden building, this workshop has walls constructed with shiplap tongue and groove cladding. The cladding uses tightly interlocking 12mm timber, to help protect against bad weather over the years, while providing a pleasing and low-profile finish to the walls that looks and feels better than the overlapped timber often found on cheaper sheds. The workshop’s roof and floor are quality tongue and groove boards, creating a great barrier to the elements and a stable base for heavier items like benches or shelves.

The building’s strength and durability are supplemented by other features, such as three windows made from robust styrene. This material is shatterproof, making it a safer alternative to glass when it comes to the potential accidents that occur in a bustling garden environment – especially when younger family members are around. A raised window allows ample natural light to enter while you work, and leaves room underneath for any work benches or shelves you want to position against the same wall. For improved security, your own padlock can be attached to the hasp and staple on the doors.

High grade mineral felt and robust fixtures and fittings are supplied as standard, alongside detailed instructions, to ensure as straightforward a build as possible. We recommend that you build your workshop with one or two helpers, or simply add the option to have your building professionally assembled by our team when you order. This building benefits from a 15-year anti-rot guarantee, as well as a 12-month manufacturer’s warranty. You must treat the building with a waterproof top coat once installed and annually thereafter. The manufacturer recommends Protek Wood Treatments, available to purchase through elbec at a fantastic price.

Additional Details about Your Order

If you think that a Mercia Premium Shiplap T&G Modular Workshop would be perfect for you, take a look at our delivery information. If you would like any extra details, feel free to email us to discuss your order and our full range of product options, or better still, give us a call so we can find the perfect product to suit your needs.

Alternatively, why not visit us at our Brookfields Garden Centre showsite near Nottingham? One of our helpful advisors will be on hand to show you around or to help guide you through your order in person. Though if there is a particular garden building you would like to see, we recommend contacting us in advance to find out if we have it, or one similar, on site.

This product is supplied flat packed with instructions and all the fixings necessary to complete construction. The timber used is pressure treated, meaning that preservative has been forced into the timber under high pressure, which ensures a longer life and less maintenance. Colour may vary from images shown. You must make sure to follow all the manufacturer’s care instructions in order to maintain the validity of your guarantee – these guidelines will be outlined in the instructions delivered with your product. This will include instructions for periodically treating your timber – many manufacturers recommend Protek Paint, available to purchase from elbec in over 60 stains and colours.

Please note: some images may show the workshop decorated with accessories/furnishings for display purposes only. These are not included with your purchase.

Key Features

  • 12 month manufacturer's warranty
  • Quality shiplap 12mm tongue and groove cladding
  • Tongue and groove boards used for roof and floor
  • Great improvement on durability compared to sheds with overlapped timber
  • Ethically sourced FSC certified timber
  • Pressure treated timber that comes with a 15-year anti-rot guarantee*
  • Heavy duty roofing felt included as standard
  • Double doors secured by hasp and staple
  • Extra single door
  • 3 opening windows glazed in shatterproof styrene
  • Assemble at home by yourself or using our professional installers
  • Modular panels, meaning windows and doors can be located wherever you wish
  • Build in reverse apex or apex layout (see product images)
  • All fixtures and fittings included


ALL DELIVERIES ARE DELIVERED TO KERBSIDE OR DRIVEWAY. All of our Mercia products are delivered flat packed other than fence panels (which are delivered fully constructed), direct to your home, and are supplied with a set of instructions to support assembly.


Booking Delivery

You will be required to book your delivery date at the time of placing your order. Our 'Request a Delivery Date' service is available to the majority of areas and you'll find that the majority of the UK postcodes are FREE but some areas may incur a delivery surcharge and some postcodes are not covered at all. Select a 'requested delivery date' by entering your post code in the 'Request a delivery date' section above. You will also be notified at this time if your area incurs a surcharge or delivery is not covered in your area.

Prior to Delivery

On the morning of your delivery date, you'll be sent an update by text with an estimated 2-hour delivery slot (this update can only be provided where a mobile number has been supplied on the billing address section at the time of checkout) together with a link to the manufacturer Mercia's delivery portal where you'll be able to track your order.

Please note: Mercia Metal and Mercia Plastic Sheds ONLY - your order is delivered by a courier you will not be notified prior to the delivery. If you are not in on the day of the delivery you will be carded and asked to contact the courier to arrange a new mutual delivery date. The estimated delivery lead time for Mercia's Metal and Plastic sheds is identified on the product page above. Lead times are in working days (Monday - Friday) excludes Bank Holidays. These estimated lead times are provided by the manufacturer. Some remote areas will take a little longer.

Upon Delivery

Your order is delivered either kerbside or driveway and will be delivered on either a 3.5T, 7.5T or 18T Lorry. Unfortunately due to health and safety and insurance liabilities the driver will not be able to take your goods around to the back of your property but may upon request place the product at the side of the house if there are no access or restriction issues. We would not risk damaging your property whilst delivering a product to an un-safe location. Unfortunately, we will not be able to go through your property.

We would recommend against arranging for a third party to install the building before it's been delivered and checked that all parts are present, as we cannot be held liable for any third-party costs.

20 x 10 (5.96m x 3.06m) Mercia Premium Shiplap T&G Modular Workshop - Pressure Treated

rrp £3029.99
save £430.09
NEW - Guarantee - 15 year - gold

Product code - 20010076


Description Information

The Pressure Treated 20 x 10 Mercia Premium Shiplap T&G Modular Workshop is a premium garden building with a huge footprint, perfect for DIY enthusiasts, full-scale workshops or for anyone with serious storage requirements. It also boasts a modular design, meaning that every panel is interchangeable to suit your needs. Key features include:

  • Modular panels, meaning windows and doors can be located wherever you wish; this can also be utilised to give you a “reverse apex” style building layout (see product images)
  • Pressure treated timber that comes with a 15-year anti-rot guarantee for your peace of mind
  • Three opening styrene windows, wide-opening double doors, and an extra single door included
  • Quality shiplap tongue and groove cladding for a sturdy build and excellent weather protection for the interior

View full specification Delivery

Choose additional options
Protek Wood Stain and Protector for Mercia Products
Protek Wood Stain and Protector 5 litres - Teak£27.99
Protek Wood Stain and Protector 5 litres - Chestnut£27.99
Protek Wood Stain and Protector 5 litres - Silver Fir£27.99
Protek Wood Stain and Protector 5 litres - Sky Grey Blue£27.99
Protek Wood Stain and Protector 5 litres - Gun Metal Grey£27.99
Protek Royal Exterior Superior Wood Finish for Mercia Products
Protek Royal Exterior Superior Wood Finish 5 litres - Clear£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Sage Leaf£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Slate Grey£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Golden Oak£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Mendip Mist£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Silver Grey£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Eggshell Blue£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Anthracite Grey£59.99

Your choices:

  • 20ft x 10ft Mercia Premium Shiplap Tongue and Groove Apex Workshop£2,599.90
        email me when in stock

        unavailableCurrently out of stock with no in stock date confirmed. Please use the EMAIL ME WHEN BACK IN STOCK button to be notified.

        info Interest Free Finance available on this product