9' x 9' Mercia Premium Corner Summer House (2.9m x 2.9m)

Product code:

From £1,579.00 Regular Price £1,779.00

To £1,804.99 Regular Price £2,004.99

Beautifully designed for a corner of the garden, this summer house for sale boasts a premium wooden build and extensive shatterproof glazing, making it ideal for family get-togethers, alfresco dining and more.

  • 10-year anti-rot guarantee
  • 12mm shiplap tongue and groove cladding on a 28 x 28mm frame
  • 12mm tongue and groove floor and roof with weatherproof cover
  • Lockable double doors with full-length glazing
  • 4 additional styrene windows
Size & Specification

Summer House Only
9' x 9' Mercia Premium Corner Summer House (2.9m x 2.9m)   + £1,579.00
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.

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  • 3. Optional Extras


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 2000
Framing Size 28 x 28mm
Size 9' x 9'
Ridge Height 2146
Roof Covering High Quality Mineral Roofing Felt
Roof Style Flat
Treatment Dip treated
Guarantee 10 years
Depth at Base 2799
Depth including Overhang 2913
Width at Base 2800
Width including Overhang 2913
Door Height 1726
Door Width 1211
Glazing Material 2mm Styrene
Locking System Lock & Key
Number of Windows 2 windows
Floor Material Tongue & Groove
Floor Thickness 12
Packaged Weight 287kg
Roof Material Tongue & Groove
Roof Thickness 12


With its unusual pentagonal design, extensive glazing and top-quality build, the 9' x 9' Mercia Premium Corner Summer House (2.9m x 2.9m) is the perfect fit to turn an unused corner of the garden into an attractive venue for family get-togethers and alfresco dining.

This beautiful summerhouse is constructed in the UK from 12mm shiplap tongue and groove cladding, supported by a 28 x 28mm wooden frame, making for a strong, long-lasting and very attractive garden retreat. The floor and roof are both built from premium 12mm tongue and groove. The former is easily able to accommodate heavier garden furniture and withstand regular footfall, while the latter is fitted with a mineral felt cover for complete weatherproof protection. The wood used to build this summer house is FSC®-certified, so only sourced from sustainable, well-managed forests.

Wide, fully-glazed double doors offer comfortable access to the interior. They are fitted with sturdy handles, turn buttons, and a key-operated lock to keep valuables safe. With 4 additional large windows, the summerhouse’s interior is bathed in natural light. All of these windows are made from styrene, which is completely shatterproof and far safer than conventional glass. It is UV resistant too, so will neither fade nor discolour in the sun.

This garden summerhouse is dip treated and supplied with an excellent 10-year anti-rot guarantee, as well as an additional 1-year parts guarantee. The anti-rot guarantee is dependent on the customer annually retreating the wood with a high-quality preservative and waterproofing treatment.

Fixtures, fittings and clear instructions are all included for a straightforward assembly.

This summerhouse for sale is also available with a side shed.

Delivery is free to most UK addresses.

  • 10-year anti-rot guarantee
  • 12mm shiplap tongue and groove cladding
  • 28 x 28mm wooden framing
  • 12mm tongue and groove floor
  • 12mm tongue and groove roof with weatherproof cover
  • Glazed double doors with key-operated lock
  • Plus 4 large styrene windows
  • Made in the UK
  • FSC®-certified timber
  • Dip treated – annual retreatment required
  • Also available with a side shed
  • Free delivery to most UK addresses

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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Representative Example
  • Purchase Rate 21.9% p.a. (variable)
  • Representative 21.9% p.a. (variable)
  • Assumed Credit Limit £1200