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: 10 x 12 (3.17m x 3.62m) Mercia Premium Reverse Apex Shiplap Workshop - Pressure Treated
Footprint (Depth x Width): 3.17m x 3.62m (10'5" x 11'11")
Height to Ridge: 2.48m (8'2")
Height to Eaves: 1.77m (5'10")
Walls: 12mm Shiplap Tongue and Groove
Framing: 45mm x 28mm (2" x 1")
Door: Double Doors
Door Opening (Height x Width): 1.66m x 1.10m (5'5" x 3'7")
Door Lock: Hasp and Staple
Roof Type: Reverse Apex
Roof: 12mm Tongue and Groove
Roofing Felt: Green Mineral Felt
Floor: 12mm Tongue and Groove
Floor Joists: -
Floor Joists Direction: Front to Back
Window(s): 1 Opening Window
Window / Wall Panels: Interchangeable
Window Glazing Material: Styrene
Windowless Option Available: N/A
Treatment: Brown Base Pressure Treatment
Portabases Available: N/A
Manufacturer's Guarantee: 15 Year Anti-Rot Guarantee
FSC Certified: Yes
Free Delivery: Yes*
Assembly Available: Optional
EAN Number: 5029442089522
Recommended Treatment: Protek Range (please click here)
Manufacturer: Mercia


This workshop is well suited to anyone looking for a flexible and spacious garden building they can trust to last. If you have always dreamed about making the most of your garden by having a dedicated workshop away from the clutter and restrictions of your house, this 10 x 12 model in Mercia’s range of Premium Reverse Apex Shiplap Workshops is a perfect place to realise your DIY ambitions and creative projects. 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 10 x 12 Premium Reverse Apex Shiplap Workshop is designed for use that goes beyond storage, featuring an opening window for refreshing natural light and air circulation which makes the workshop feel a world away from a gloomy, windowless shed. A reverse apex roof is preferred by many customers for its more contemporary look over the traditional apex roofed shed, and 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 window, this transforms your garden workshop into the place you want to be for hours at a time.


The 10 x 12 Mercia Premium Reverse Apex Shiplap Workshop’s greatest asset is without a doubt its high quality 12mm timber cladding, constructed with a shiplap tongue and groove design whose timber tightly interlocks. This protects the workshop against the ingress of water 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.

Pressure Treatment - This shed comes pressure treated in an attractive, brown colour. Pressure treated timber has undergone a process where preservatives are forced into the timber under high pressure. This provides extra longevity and an unbeatable level of protection for the wood against rot, insects and fungus. This also means the building comes with a 15 year anti-rot guarantee.

Though pressure treated timber is well protected, customers should carefully read and follow all care guidelines supplied by the manufacturer with your building. This usually involves regular treatment with a water based treatment. The manufacturer recommends Protek Wood Treatments, available to purchase through elbec at a fantastic price.

The styrene pane used in this building’s window is shatterproof, making it safer for a busy garden environment or one where 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.

All our sheds are supplied pre-treated with a base coat to both sides in a golden brown water based industrial product (colour can vary from the picture shown) for protection during manufacture and transit. You must apply a water based top coat of your choice in order to receive the full 10-year anti-rot guarantee. Many manufacturers recommend Protek wood treatment, available from elbec in a wide variety of different colours. This will protect the timber from weathering, making it last longer. The timber treatment will need to be repeated periodically in line with the manufacturer's instructions.

What is included?

  • 15 year anti-rot guarantee*
  • Great improvement on durability over sheds with overlapped timber
  • Ethically sourced and dip treated 12mm timber
  • Heavy duty roofing felt included as standard
  • Double doors secured by hasp and staple
  • Ledged and braced door with strong ‘Z’ shaped bracing for added security
  • Assemble at home by yourself or using our professional installers



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.

You'll be contacted on the morning of your delivery date either by text or email with a 2 hour delivery slot. You will also be contacted by the driver 30 minutes before the delivery location.

Please note: for 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.

Delivery Leadtimes

The estimated delivery lead time for this product 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 and are not guaranteed - due to fluctuation in demand - but are provided in good faith and are representative of delivery at that time. Some remote areas will take a little longer.

Upon Delivery

Your order is delivered either kerbside or driveway and will be delivered on a 17 ton lorry (the size of a Refuse Cart). 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.

Installation Option

The leadtime for our installation option around 8 weeks.  With the installation option, some orders will have delivery and installation on different days, and some orders will have installation and delivery on the same day.  You will be advised by the manufacturer's installation team which category your order falls in to.

Within 3 working days of placing your order, you will be sent an installation questionnaire to complete and subsequently contacted with an installation date.

10 x 12 (3.17m x 3.62m) Mercia Premium Reverse Apex Shiplap Workshop - Pressure Treated

rrp £1320.00
save £160.01

Product code - 20010162


Description Information

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

  • A window that opens and has room beneath for a work bench
  • Double doors with hasp and staple, which can be opened wide for easy access or secured by attaching your own padlock
  • 15 year anti-rot guarantee on our pressure treated timber
  • High quality 12mm timber used for strong shiplap tongue and groove wall cladding

View full specification Delivery

Choose additional options
Protek Royal Exterior Superior Wood Finish for Mercia Products
Protek Royal Exterior Superior Wood Finish 5 litres - Sage Leaf£46.00
Protek Royal Exterior Superior Wood Finish 5 litres - Golden Oak£46.00
Protek Royal Exterior Superior Wood Finish 5 litres - Slate Grey£46.00
Protek Royal Exterior Superior Wood Finish 5 litres - Mendip Mist£46.00
Protek Royal Exterior Superior Wood Finish 5 litres - Silver Grey£46.00
Protek Royal Exterior Superior Wood Finish 5 litres - Spring Green£46.00
Protek Royal Exterior Superior Wood Finish 5 litres - Anthracite Grey£46.00
Protek Wood Stain and Protector for Mercia Products
Protek Wood Stain and Protector 5 litres - Teak£20.00
Protek Wood Stain and Protector 5 litres - Ebony£20.00
Protek Wood Stain and Protector 5 litres - Chestnut£20.00
Protek Wood Stain and Protector 5 litres - Dark Oak£20.00
Protek Wood Stain and Protector 5 litres - Silver Fir£20.00
Protek Wood Stain and Protector 5 litres - Sky Grey Blue£20.00
Protek Wood Stain and Protector 5 litres - Clear Top Coat£26.00
Protek Wood Stain and Protector 5 litres - Gun Metal Grey£20.00
OUT OF STOCK - Protek Wood Stain and Protector 5 litres - Soft Sage£20.00
OUT OF STOCK - Protek Wood Stain and Protector 5 litres - Cornflower£20.00

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  • 10 x 12 (3.17m x 3.62m) Mercia Premium Reverse Apex Shiplap Workshop - Pressure Treated£1,159.99
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