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: 12 x 10 (3.68m x 3.23m) Mercia Premium Shiplap Reverse Apex Workshop
Footprint (Width x Depth): 3.57m x 3.06m (11'9" 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: Window configurations:
Option 1
1 window on the left-hand side front width (the door can then be located on the right-hand side front width) and the 2nd window on either the left-hand side or right-hand side depth
Option 2
1 window on the right-hand side front width the door can then be located on the left-hand side front width) and the 2nd window on either the left-hand side or 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: 5029442006321
Recommended Treatment: Protek Range (please click here)
Manufacturer: Mercia Garden Products Limited


This workshop is well suited to anyone looking for a flexible and spacious garden building they can trust to last. This 12 x 10 model in Mercia’s range of Premium Reverse Apex Shiplap Workshops allows you to make the most of your garden by having a dedicated workshop away from the clutter and restrictions of your house. A step up from the smaller 10 x 10 model, with an additional two feet of length, this workshop offers a large and useful interior space while keeping a footprint that will be appropriate for many suburban or town gardens.

The 12 x 10 Premium Reverse Apex Shiplap Workshop is designed for usage that goes beyond storage, featuring two opening windows for refreshing natural light and air circulation, a perfect place to realise your DIY ambitions and creative projects. A reverse apex roof has the door on the wider side, and is preferred by many customers for its more contemporary look and better front access. The headroom provided by the generous height of its ridge and eaves also means that the building is comfortable to work in. Alongside the opening styrene window, this transforms your garden workshop into the place you want to be for hours at a time.


The 12 x 10 Mercia Premium Reverse Apex Shiplap Workshop uses high quality 12mm timber cladding, constructed with a shiplap tongue and groove design with tightly interlocking timber. This prevents water getting into the workshop and ensures the building’s strength. The workshop’s floor and roof match this tongue and groove construction, giving the entire interior of the workshop a sleek, low profile finish while providing excellent structural stability.

The styrene pane used in this building’s window is shatterproof, making it safer for a busy garden environment or one where a young family are nearby. Heavy duty roofing felt is also included as standard, which works with the sloped angles of the reverse apex roof to divert rainfall away from your workshop. If security concerns you, the hasp and staple included on the double doors can easily fit a padlock.

This building is supplied flat packed with detailed instructions and all the fixtures needed to complete assembly by yourself. We recommend that you build your workshop with one or two trusted friends, or simply add the option to have your building professionally assembled by our team when you order.

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.

What is included?

  • Great improvement and durability over overlap sheds
  • 12mm cladded walls using ethically sourced timber
  • Heavy duty roofing felt included as standard
  • 10 year anti-rot guarantee dependant on care guidelines being followed
  • Double doors secured by hasp and staple with your own padlock
  • Ledged and braced door with strong ‘Z’ shaped bracing for added security
  • Assemble yourself at home or using our professional installers


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.

12 x 10 (3.68m x 3.23m) Mercia Premium Shiplap Reverse Apex Workshop

NEW - Guarantee - 10 year - gold

Product code - 20010187


Description Information

The 12 x 10 Mercia Premium Reverse Apex Shiplap Workshop has two opening windows and a set of double doors, ideal for those who want a  more comfortable garden building to spend time in than the average garden shed. Whether you are a DIY enthusiast or simply require the ample storage space offered by this 12 x 10 workshop, this is a garden building that offers a premium build quality at a reasonable price. Some of its features include:

  • Wide double doors for easy access with hasp and staple that can be secured by attaching your own padlock
  • 10 year anti-rot guarantee
  • Reverse apex design, suitable for many different garden sizes
  • High quality 12mm timber used for strong shiplap tongue and groove wall cladding

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:

  • 12 x 10 (3.68m x 3.23m) Mercia Premium Shiplap Reverse Apex Workshop£1,999.99