premium range

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: 18 x 10 (5.47m x 3.23m) Mercia Premium Shiplap Reverse Apex Workshop
Footprint (Width x Depth): 5.36m x 3.06m (17'7" x 10'0")
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
Door Opening (Height x Width): 1.67m x 1.20m (5'6" x 3'11")
Door Lock: Hasp and Staple
Roof Type: Reverse Apex
Roof: 12mm Tongue and Groove
Roofing Felt: Included
Floor: 12mm Tongue and Groove
Floor Joists: Awaiting information
Floor Joists Direction: Awaiting information
Window(s): 2 Opening Windows
Window / Wall Panels: Option 1
1 window on the front width (left, middle or right), (the door can then be located on the (left, middle or right depending on the window location) and the 2nd window on the left-hand side depth
Option 2
1 window on the front width (left, middle or right), (the door can then be located on the (left, middle or right depending on the window location) and the 2nd window on the right-hand side depth
Option 3
Both windows on either the left-hand side or the right-hand side depth
Option 4
1 window on the left-hand side depth and  the 2nd window on the right-hand side depth 
(the location of the windows and door can be decided at the time of assembly)
Window Glazing Material: Styrene
Windowless Option Available: N/A
Treatment: Dip Treated
Portabases Available: N/A
Manufacturer's Guarantee: 10 Year Anti-Rot Guarantee
FSC Certified: Yes
Free Delivery: Yes*
Assembly Available: Optional
EAN Number: 5029442006369
Recommended Treatment: Protek Range (please click here)
Manufacturer: Mercia Garden Products Limited


The 18 x 10 Premium Shiplap Modular Reverse Apex Workshop from Mercia is ideal if you’re looking for a shed spacious enough to be used for storage and as a workshop. The high quality tongue and groove construction protects from the elements and keeps water out. The reverse apex design means the door is on the wider side of the shed, so allows better access, with wide double doors for storage of larger items. The modular design means that the window and door panels can be placed in a position of your choosing.


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 two 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 10-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. 

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

Additional Details about Your Order

If you think that a Mercia Premium Reverse Apex Shiplap 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 shed 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.


The shed is supplied untreated except for a factory applied base coat.  This base coat may differ in shade across parts. This dip-treated product requires treatment immediately after assembly, and thereafter annual re-treatment to protect against rotting. There is a 10 year anti-rot guarantee from Mercia, dependant upon the building being treated annually with a wood preservative and a waterproof topcoat.  Our manufacturer recommends Protek Royal Exterior wood paint to protect your shed, you can select your colour choice from the paint options on this page.  Alternatively, if you don't see a colour you like, elbec offer the full range of Protek paints to personalise your garden building.  Click here for the full range of Protek Royal colours.

About Mercia

Mercia Garden Products pride themselves as a British business with over 140 years’ experience. They offer a variety of products ranging from traditional summerhouses and log cabins to greenhouses and fencing and garden storage solutions. All their products are manufactured in the UK using FSC® certified and ethically sourced materials in their products. Mercia focuses on innovating and improving their products whilst maintaining customer satisfaction, including ensuring safety for both customers and staff.

Key Features

  • Modular panels, meaning windows and doors can be located wherever you wish
  • Comes with a 10-year anti-rot guarantee
  • Ethically sourced FSC certified timber
  • Quality shiplap 12mm tongue and groove cladding
  • Great improvement on durability compared to sheds with overlapped timber
  • 12 month manufacturer's warranty
  • Tongue and groove boards used for roof and floor
  • Heavy duty roofing felt included as standard
  • Double doors secured by hasp and staple
  • 2 opening windows glazed in shatterproof styrene
  • Assemble at home by yourself or using our professional installers
  • 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 (except for Metal Shed). 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 postcode 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 delivery portal where you'll be able to track your order.

Please note: Mercia Metal 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 sheds is identified on the product for the metal shed. Lead times are on 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 unsafe 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.


Orders with Assembly 

The lead time for our installation option is around 12 weeks from the date of order. With the installation option, the majority of orders will have their delivery and installation on separate days; there will be a small number of orders which will have delivery and installation on the same day. You will be advised by the manufacturer's installation team which category your order falls into.

Depending on the installation option for your order, you will be contacted within the delivery timescale and given a date for either delivery/assembly on the same date or a separate date for delivery and assembly.

18 x 10 (5.47m x 3.23m) Mercia Premium Shiplap Reverse Apex Workshop

NEW - Guarantee - 10 year - gold

Product code - 20010191


Description Information

One of the larger models, the 18 x 10 Mercia Premium Shiplap Modular Workshop is the perfect choice for those wanting a workshop or craft space with plenty of storage room. The modular design means during assembly the windows and doors can be placed in the position that best suits your garden. Key features include:

  • Attractive and practical reverse apex style
  • Comes with a trusty 10-year anti-rot guarantee
  • Quality shiplap tongue and groove cladding for a sturdy build and excellent weather protection for the interior
  • Two opening styrene windows and wide-opening double doors

View full specification Delivery

Pick-A-Day home delivery from: Friday 15th July (subject to location)

excludes installation option
Choose additional options
Protek Royal Exterior Superior Wood Finish for Mercia Products
Protek Royal Exterior Superior Wood Finish 5 litres - Golden Oak£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Sage Leaf£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Silver Grey£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Clear£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Eggshell Blue£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Slate Grey£59.99
Protek Royal Exterior Superior Wood Finish 5 litres - Mendip Mist£59.99

Your choices:

  • 18 x 10 (5.47m x 3.23m) Mercia Premium Shiplap Reverse Apex Workshop£2,699.99