12 x 8 (3.64m x 2.95m) Mercia Helios Summerhouse

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12x8 Mercia Premium Helios Summerhouse - Angle View doors open
  • 12x8 Mercia Premium Helios Summerhouse - Angle View doors open
  • 12x8 Mercia Premium Helios Summerhouse - Angle View doors open
  • 12x8 Mercia Premium Helios Summerhouse - Angle View doors closed
  • 12x8 Mercia Premium Helios Summerhouse - White background Angle View
  • 12x8 Mercia Premium Helios Summerhouse - White background Front View
  • 12x8 Mercia Premium Helios Summerhouse - White background Side View with doors closed
  • 12x8 Mercia Premium Helios Summerhouse - Internal View
  • 12x8 Mercia Premium Helios Summerhouse - in situ top view
  • 12x8 Mercia Premium Helios Summerhouse - in situ top view
  • 12x8 Mercia Premium Helios Summerhouse - Dimensions
  • 12x8 Mercia Premium Helios Summerhouse - Footprint

12 x 8 (3.64m x 2.95m) Mercia Helios Summerhouse

Save £150.00
NEW - Guarantee - 10 year - gold

Product Code - 20040115


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Pick-A-Day home delivery from: Friday 24th May (subject to location)

excludes installation option

Your choices:

  • 12 x 8 (3.64m x 2.95m) Mercia Helios Summerhouse£1,249.99


            The 12 x 8 Premium Helios Summerhouse from Mercia is a contemporary summerhouse with a unique design that will complete the look of your garden. The pent roof and wide-opening double doors make the interior bright and airy. The fantastic look makes this the place to be on balmy summer evenings.  

            Choosing to buy a summerhouse is one of the best ways to improve your garden and make the most of your time outdoors. The Helios Summerhouse is perfect for family time and getting together with friends for BBQs and drinks. It’s a great outdoor room for entertaining, and a large overhang is on the front of the roof. It’s ideal for escaping rain showers and provides plenty of shade on hot days.

            The pent roof and double doors make the interior spacious and give the wooden summerhouse a relaxing atmosphere. The four windows let in lots of light, and the three-quarter glazed double doors offer excellent ventilation. Open up the room as the weather warms up, and as the night turns cooler, you can close them and stay cosy inside.

            Also available: 8 x 8 Premium Helios Summerhouse and 10 x 8 Premium Helios Summerhouse


            Guarantee - 10-year anti-rot

            Walls - 12mm tongue and groove interlocking cladding for maximum strength

            Floor - high-quality 12mm planed tongue and groove.

            Roof - curved pent roof constructed with 12mm tongue and groove and roofing felt provided

            Frame - 45mm x 27mm (2' x 1 1/3')

            Windows - styrene glazed windows

            Doors - semi-glazed double doors 

            Treatment - water-based base coat (application of preservative and waterproof coat required)

            Make the Most of Your Summerhouse

            The Helios is an ideal garden entertaining space; however, it is so versatile you can use it for much more. This large summerhouse's interior makes it a versatile outdoor room that you can use for whatever you like. Decorate with comfy furniture so you can relax with a good book. Add a table and seats inside to make an outdoor eating area that you can use most of the year. A summerhouse is also suitable for a summer garden office or a place to do your crafts. Whatever you choose to do with it, you’ll love every minute you spend in your new summerhouse.

            About Your Order:

            The Helios Summerhouse is made in Britain using FSC® certified timber. You get a top-quality summerhouse with a low carbon footprint. Made from ethically sourced materials, you can feel good when you buy a summerhouse from Mercia. This easy to assemble summerhouse includes all the fixtures and fittings required. The summerhouse includes a 10-year anti-rot guarantee and a 12-month manufacturer's warranty. 

            The summerhouse comes with hard-wearing fixings, high-quality roof felt, and the manufacturer's comprehensive assembly instructions. The premium Shiplap boards are fixed to a solid internal framing that produces a hard-wearing and weather-resistant panel. 

            Please note: Images may depict furnishings and accessories; these are for illustration purposes only and are not included with your order. 

            Summerhouse Aftercare:

            The summerhouse has a base coat on both sides; this is a water-based golden brown product for protection during transport. To ensure you enjoy your summerhouse for many seasons, you must apply a preservative and waterproofing topcoat immediately after installation. Using these treatments after installation, followed by consistent annual treatment of the summerhouse, will maintain the high-quality finish and retain the 10-year anti-rot guarantee. A 1-year manufacturer's warranty is included as standard. All you have to do is assemble and enjoy!

            To protect the summerhouse, elbec recommends Protek wood treatment. Browse our Protek Royal Exterior Wood Finish Paint range to find the best summerhouse paint colour to add your own personalise finish.  We have included some popular Protek paint colours on this page. 

            About Mercia:

            Mercia is one of the best UK garden building manufacturers. They have over 140 years of experience, so you get a summerhouse of the highest quality when choosing Mercia. Mercia combines the latest manufacturing techniques with the best hardwearing materials to produce British-made sheds and summerhouses built to the highest standards.

            Every product Mercia produces is made with safety and exceeding your expectations in mind. You will immediately see why this is one of the best summerhouses and shed manufacturers when you receive your order. All products are made with ethically sourced materials, FSC® certified timber, and a 10-year anti-rot guarantee.



            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 7 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.


            Please note: all imperial measurements are approximate, and the Mercia Summerhouses are made from metric measurements. We would recommend that the base is at least 50mm bigger in each direction.

            Product Name:
            12 x 8 (3.64m x 2.95m) Mercia Premium Helios Summerhouse
            Footprint Depth:
            2.35m (7'9")
            Footprint Width:
            3.51m (11'6")
            Ridge Height:
            2.16m (7'1")
            Eaves Height:
            1.84m (5'11')
            Tongue and Groove
            Cladding Thickness:
            Treatment Type:
            Golden Brown Base Coat Dip Treatment
            Recommended Treatment:
            Protek Range (please click here)
            Manufacturer's Guarantee:
            10 Year Anti-Rot Guarantee
            Framing Size:
            27mm x 44mm (11 /16" x 13 /4")
            Roof Type:
            Roof Material:
            Tongue and Groove
            Roof Thickness:
            Roofing Felt:
            Green mineral
            Floor Material:
            Tongue and Groove
            Floor Thickness:
            Floor Joists:
            27mm x 44mm (11 /16" x 13 /4")
            Floor Joist Direction:
            Front to Back
            Door Type:
            Double doors
            Door Height:
            1.71m (5'7")
            Door Width:
            1.19m (3'11")
            Door Lock System:
            Mortice lock (keys supplied)
            Number of Window(s):
            Front Width: 2 x fixed windows
            Depth: 2 x fixed windows
            Window Material:
            Window/Door Panel(s) Interchangeable:
            Optional Assembly:
            FSC Certified:
            Free Delivery*:
            Optional Wooden Base:
            Manufacturer's Product Code:
            EAN Number:
            Mercia Garden Products Ltd
            Country of Origin:
            United Kingdom


            The 12 x 8 Mercia Helios Summerhouse has an elegant design perfect for adding a touch of luxury to your garden. The modern summerhouse is spacious with multiple windows and an eye-catching curved pent roof. The key features include:

            • Unique curved pent roof
            • Large fixed styrene glazed windows
            • Semi-glazed double doors secured with a lock and key
            • 12mm shiplap tongue and groove construction
            • 10-year anti-rot guarantee

            Key Features

            • Free UK mainland delivery

            • Pick your date of delivery when ordering

            • 12mm shiplap tongue and groove used for walls, roof, and floor

            • Stylish curved roof to encourage run-off of rainwater

            • Semi-glazed double door allow sunlight to flood into the interior

            • Clear styrene used in all glazing, a shatterproof alternative to glass

            • 10-year anti-rot guarantee from the manufacturer

            • FSC certified timber 

            • Mineral roofing felt included

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