12' x 8' Mercia Premium Corner Summer House with Side Shed (3.6m x 2.6m)

Product code:

From £1,799.00 Regular Price £2,029.00

To £2,575.98 Regular Price £2,805.98

Transform that tired, old corner of your garden into a sheltered oasis of tranquillity and light, while wrapping up your storage needs too, with this impeccably-built summer house plus side shed.

  • Superb 10-year anti-rot guarantee
  • 12mm shiplap tongue and groove cladding on a robust 28 x28mm wooden frame
  • 12mm tongue and groove floor and roof fitted with premium mineral felt cover
  • Summerhouse has glazed double doors and 2 additional extra-large windows
  • Shed comes with separate double doors
Size & Specification

Summer House Only
12' x 8' Mercia Premium Corner Summer House with Side Shed (3.6m x 2.6m)   + £1,799.00
Optional Plastic Base

Recommended if you do not have a solid, level base such as concrete or paving slabs.

The interlocking design of the plastic base kit makes it easy to put together and, though lightweight, it provides a very strong and durable base for the summerhouse. Made from 100% recycled plastic. Heavy-duty membrane included.

Each square is 500 x 500 x 50mm.

Optional Installation

Please allow 6 - 8 weeks for delivery if adding installation. Unless you have purchased one of our wooden base kits, please ensure a solid, level base is constructed before your installation date. Please note that we do not install plastic bases or other accessories. Should you choose the installation option it will supersede the 'Pick a day' date. We will contact you to arrange an installation date after checkout.

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  • 3. Optional Extras


From as little as £ per month at %APR
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In stock

Pick a day Delivery
  • Specification
  • Description
  • Trustpilot Reviews
  • Delivery


Brand Mercia
Cladding Shiplap Tongue and Groove
Cladding Thickness 12
Construction Type Shiplap
Door Type Double Doors
Eaves Height 1993
Framing Size 28 x 28mm
Size 12' x 8'
Ridge Height 2121
Roof Covering High Quality Mineral Roofing Felt
Roof Style Flat
Treatment Dip treated
Guarantee 10 years
Depth at Base 3575
Depth including Overhang 3683
Width at Base 2430
Width including Overhang 2542
Door Height 1726
Door Width 1205
Glazing Material 2mm Styrene
Locking System Lock & Key
Number of Windows 2 windows
Floor Material Tongue & Groove
Floor Thickness 12
Packaged Weight 357kg
Roof Material Tongue & Groove
Roof Thickness 12


Perfect for your family get-togethers and alfresco dining, the 12 x 8 Mercia Premium Corner Summer House with Side Shed (3.6m x 2.6m) features an eye-catching pentagonal design, which makes it the ideal summerhouse to rejuvenate a tired, old corner of your garden.

This garden summerhouse is expertly crafted in Great Britain from 12mm shiplap tongue and groove cladding, supported by a 28 x 28mm wooden frame, so it has the strength and durability to be a much-loved feature of your garden for many years to come. The timber used to build this summer house is FSC®-certified, which is the only wood-certification scheme endorsed by all of the major environmental charities.

The floor and roof are both constructed from 12mm tongue and groove, renowned for its superior strength and weathertight qualities. The floor will comfortably accommodate your heavier garden furniture, while the roof is fitted with a premium mineral felt cover to provide you with complete weatherproof protection.

You can gain comfortable access to the summer house via glazed double doors, which are fitted with chunky handles, exterior turn buttons and a key-operated lock, so rest assured that your valuables will remain safe from unwanted attention.

Two additional extra-large windows ensure the interior is bathed in natural light. These windows are made from styrene, so are completely shatterproof and far safer than conventional glass – ideal when you’ve got a busy, family-orientated garden. What’s more, as they’re UV protected, they will neither fade nor discolour in the sun.

The storage shed comes with its own set of double doors, which are fitted with a pad bolt, so you can rest assured that your expensive tools and equipment will stay safe from unwanted attention (padlock not supplied). This shed contains ample storage space for tools, bicycles or garden furniture.

Supplied with a superb 10-year anti-rot guarantee, plus additional 1-year parts guarantee, this summer house is dip treated to guard against rot. You must retreat the wood, on an annual basis, with a high-quality preservative and waterproofing treatment, in order to keep the summerhouse looking pristine and validate the anti-rot guarantee.

We supply fixtures, fittings and clear instructions to help you achieve a straightforward assembly. You can also purchase a model of this beautiful summerhouse for sale without the side shed.

Free delivery is available to most UK postcodes.

  • Superb 10-year anti-rot guarantee
  • 12mm shiplap tongue and groove cladding on a 28 x 28mm wooden frame
  • 12mm tongue and groove floor
  • 12mm tongue and groove roof includes premium mineral felt cover
  • Summerhouse has glazed double doors fitted with key-operated lock
  • 2 additional extra-large windows
  • Shed comes with separate lockable double doors
  • Made in Great Britain
  • FSC®-certified wood
  • Dip treated – must be retreated annually
  • Available with or without a side shed
  • Free delivery to most UK postcodes

Trustpilot Reviews


Windsor Delivery

Windsor Delivery 

We offer FREE delivery to the majority of mainland UK postcodes but some areas may incur an additional carriage charge (see below) and some postcode areas are not covered at all. Please use our postcode checker above to check delivery is available to your area.

£69.99 - BT, CF, DD, DG, DT6-8, EH, EX, FK, G, KA, KY, LD, LL, ML, PA1-19, PH1-20, PL, SA, SY, TA, TD, TQ, TR

£109.99 - AB, PA21-38, PH21-41

£129.99 - IV, KW

£249.99 - GY, Isle of Wight, Isle of Man, JE


Our 'Pick a Day' service is available to the majority of postcode areas, however some exclusions apply. 'Pick a day' is available on delivery only orders. Should you choose the installation option (if available) it will supersede the 'Pick a day' date. A delivery and installation date will be arranged with you by the delivery team.

Delivery to every area of the UK cannot be made every day. Some postcodes fall into an extended delivery lead time area. The extended delivery lead time will be in addition to the typical lead time stated. If your postcode falls into one of the extended lead time areas then the delivery team will be contacting you to arrange an appropriate delivery date.

If you will be unavailable on the day of delivery the driver can attempt to leave your order in a safe place, please indicate this when selecting your delivery as re-delivery charges may be levied if delivery fails on the agreed date. If you haven't already selected your delivery day, our delivery team will contact you to arrange an acceptable delivery date based on the typical lead time stated for the product.

Please allow 6 - 8 weeks for delivery if adding installation.

Upon Delivery:

Delivery of this item is typically made by a 7.5 ton flat-bed (similar size to a council refuse lorry) up to an 18 ton lorry (similar size to a removals lorry). Delivery is typically between 7am and 7pm. Unfortunately, we are unable to specify a timed delivery.

The delivery drivers are only insured to deliver to kerb side or driveway. 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. Please note that some buildings will not pass through standard doorways in houses. Please call to seek advice if there are any access concerns.

This product is delivered in a flat packed, sectional format direct from the manufacturer to your home with full instructions ready for DIY assembly.

Please Note - delivery is NOT available to the following locations: Isles of Scilly & Scottish Islands


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