The Mercia Thoresby Premium Insulated Garden Room 4m x 3m

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The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - in situ, angle view
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  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - in situ, angle view
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  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - uPVC
  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - insulation
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  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - felt
  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - roof and floor
  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - internal view
  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m - dimensions
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Key Features

Bespoke and Made to Measure


Contact our Sales Teams for more information on our bespoke service

£11,439.99
NEW - UPVC Mercia
NEW - Guarantee - 10 year - gold
NEW - Installation - Free Installation
NovunaFlexible Finance
More Info

Product Code - 20040172

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Usually delivered: 3 - 6 Weeks.

excludes installation option
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Choose additional extras
Protek Wood Presever Plus for Mercia Products
Low Stock - Protek Wood Preserver++ 5 Litres for Mercia Products

Give your building that extra layer of treatment with Protek's Wood Preserver Plus.  Whilst containing all the great properties of a wood preserver its extra advantage is that it's effective against wood destroying fungi, blue stain, wood boring insects and controls and provides a resinous surface against water.  The key features include:

  • Dry in 4-6 hours
  • Provides the ideal surface to apply a finishing Paint such as Protek Royal Paint
  • Suitable for rough sawn and smooth timber
  • Easily penetrates inner layers of the building
  • After drying it is odourless
£59.99
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Protek Royal Exterior Superior Wood Finish for Mercia Products
Protek Royal Exterior Superior Wood Finish 5 litres - Golden Oak

A light, natural, golden tone that is consistently a bestseller, Golden Oak Protek Royal Exterior is perfect for lovers of a natural, wood look for their timber products. Protek Royal Exterior is a water-based treatment. This gives it a number of advantages over other types of treatment. Because water is the “carrier” in Protek, this means that when the paint dries it is water that evaporates, not oil or white spirit. This gives Protek a low VOC (Volatile Organic Compound) rating and a low odour.  The key features include:

  • Manufactured to be as environmentally friendly as possible
  • Quick-drying and safe for use around children, pets and plants
  • Complies with EN71 parts 2 and 3 relating to child toy safety and flammability
  • UV protection provides a rich, long lasting colour while still allowing the natural appeal of the wood grain to show through
  • Protek also use a biodegradable fungicide to minimise the impact of its products on the environment.
  • Adds excellent water resistance as well as fantastic protection from mould, fungus, rot and weathering

Delivery:   Your treatment is delivered separately to your main product.  The delivery times for treatment is up to 10 Working Days.  Towards the end of your timescale, you will be sent an email (where an email address has been supplied) from the courier APC to confirm your delivery date.  Delivery is between 7am and 7pm. Your order must be checked upon delivery and any discrepancies should be noted on the delivery note for the driver. 

Important Note on Colour

Although the colour we show with each product is as close as possible but because of the colour you see on your screen, or even if you print out our product information page, it may vary from how the colour of the treatment appears in reality.  

£49.99
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Protek Royal Exterior Superior Wood Finish 5 litres - Sage Leaf

Sage Leaf Protek Royal Exterior is one of the most popular colours in the range and it’s easy to see why. An attractive and natural-looking shade of muted green. Protek Royal Exterior is a water-based treatment. This gives it a number of advantages over other types of treatment. Because water is the “carrier” in Protek, this means that when the paint dries it is water that evaporates, not oil or white spirit. This gives Protek a low VOC (Volatile Organic Compound) rating and a low odour.  The key features include:

  • Manufactured to be as environmentally friendly as possible
  • Quick-drying and safe for use around children, pets and plants
  • Complies with EN71 parts 2 and 3 relating to child toy safety and flammability
  • UV protection provides a rich, long lasting colour while still allowing the natural appeal of the wood grain to show through
  • Protek also use a biodegradable fungicide to minimise the impact of its products on the environment.
  • Adds excellent water resistance as well as fantastic protection from mould, fungus, rot and weathering

Delivery:   Your treatment is delivered separately to your main product.  The delivery times for treatment is up to 10 Working Days.  Towards the end of your timescale, you will be sent an email (where an email address has been supplied) from the courier APC to confirm your delivery date.  Delivery is between 7am and 7pm. Your order must be checked upon delivery and any discrepancies should be noted on the delivery note for the driver. 

Important Note on Colour

Although the colour we show with each product is as close as possible but because of the colour you see on your screen, or even if you print out our product information page, it may vary from how the colour of the treatment appears in reality.  

£49.99
updown
Protek Royal Exterior Superior Wood Finish 5 litres - Silver Grey

Silver Grey Protek Royal Exterior is an enchanting light grey colour with a silvery hue that is reminiscent of a forest bustling with the shimmering bark of silver birch trees.  Protek Royal Exterior is a water-based treatment. This gives it a number of advantages over other types of treatment. Because water is the “carrier” in Protek, this means that when the paint dries it is water that evaporates, not oil or white spirit. This gives Protek a low VOC (Volatile Organic Compound) rating and a low odour.  The key features include:

  • Manufactured to be as environmentally friendly as possible
  • Quick-drying and safe for use around children, pets and plants
  • Complies with EN71 parts 2 and 3 relating to child toy safety and flammability
  • UV protection provides a rich, long lasting colour while still allowing the natural appeal of the wood grain to show through
  • Protek also use a biodegradable fungicide to minimise the impact of its products on the environment.
  • Adds excellent water resistance as well as fantastic protection from mould, fungus, rot and weathering

Delivery:   Your treatment is delivered separately to your main product.  The delivery times for treatment is up to 10 Working Days.  Towards the end of your timescale, you will be sent an email (where an email address has been supplied) from the courier APC to confirm your delivery date.  Delivery is between 7am and 7pm. Your order must be checked upon delivery and any discrepancies should be noted on the delivery note for the driver. 

Important Note on Colour

Although the colour we show with each product is as close as possible but because of the colour you see on your screen, or even if you print out our product information page, it may vary from how the colour of the treatment appears in reality.  

£49.99
updown
Protek Royal Exterior Superior Wood Finish 5 litres - Slate Grey

Slate Grey Protek Royal Exterior has the attractive and prominent boldness of slate. A striking shade of dark grey with subtle blue tones, much like traditional slate, it is a very popular choice with customers for its versatility.  

Protek Royal Exterior is a water-based treatment. This gives it a number of advantages over other types of treatment. Because water is the “carrier” in Protek, this means that when the paint dries it is water that evaporates, not oil or white spirit. This gives Protek a low VOC (Volatile Organic Compound) rating and a low odour.  The key features include:

  • Manufactured to be as environmentally friendly as possible
  • Quick-drying and safe for use around children, pets and plants
  • Complies with EN71 parts 2 and 3 relating to child toy safety and flammability
  • UV protection provides a rich, long lasting colour while still allowing the natural appeal of the wood grain to show through
  • Protek also use a biodegradable fungicide to minimise the impact of its products on the environment.
  • Adds excellent water resistance as well as fantastic protection from mould, fungus, rot and weathering

Delivery:   Your treatment is delivered separately to your main product.  The delivery times for treatment is up to 10 Working Days.  Towards the end of your timescale, you will be sent an email (where an email address has been supplied) from the courier APC to confirm your delivery date.  Delivery is between 7am and 7pm. Your order must be checked upon delivery and any discrepancies should be noted on the delivery note for the driver. 

Important Note on Colour

Although the colour we show with each product is as close as possible but because of the colour you see on your screen, or even if you print out our product information page, it may vary from how the colour of the treatment appears in reality.  

£49.99
updown

Your choices:

  • The Mercia Thoresby Premium Insulated Garden Room 4m x 3m£11,439.99
            Total
            updown
            £11439.99

            Description

            The Mercia Thoresby 4m x 3m Insulated Garden Room with veranda is a modern space with a spacious design. The reverse apex roof, double glazed windows, and double doors also double glazed make this feel like a luxurious garden room. Free installation is included; place your order, and get ready to enjoy your new garden building.

            This modern timber garden room with a veranda will fit many gardens. The open-plan room allows you to furnish it in any way you want. Make it your luxury garden escape with comfy sofas, use bedroom furniture to make it a spare room for guests, or use it as a garden office. Classed as both modern and traditional, the reverse apex design provides a sheltered veranda on the front, perfect for rainy days. The walls are designed with a panel to conceal any electrics you may want to add. Mercia produces some of the best wooden garden rooms you can buy; you will enjoy this new addition for many years.

            The french double glazed doors and double-glazed windows make the luxury garden room bright and light. The reverse apex roof creates an elevated ceiling ridge, making the inside area feel big, and you can add feature lights. The roof is protected by an EPDM waterproof rubber membrane designed to last 50 years. 

            The premium finishing touches and traditional design of the Mercia Thoresby make this one of the best insulated garden rooms. Come and see the incredible build quality for yourself by visiting our Nottingham showroom, where you can take a walk around a Mercia garden room.

            Also available:

            Mercia Thoresby 5m x 3m Insulated Garden Room with Veranda

            Features:

            Installation - Included in the price

            Guarantee - 10-year anti-rot

            Wall - 100mm Double skinned walls insulated (with internal 12mm tongue and groove + 72mm framing + external 16mm Shiplap+ and EcoQuilt Insulation)

            Floor - 16mm Tongue and groove floor with Air Tec Insulation between the bearers

            Roof - reverse apex roof 158mm (including framework) tongue and groove roof with EcoQuilt Insulation covered with EPDM rubber roof

            Windows - 4 double glazed windows include 2 top opening windows

            Doors - Double glazed French doors 

            Treatment - untreated (application of preservative and waterproof coat required)

            Make the Most of Your Garden Room:

            The Mercia Thoresby 4m x 3m Insulated Garden Room with Veranda lets you add more space that you can use in a variety of ways. This year-round garden room is versatile and comfortable for all seasons, thanks to the insulated walls, roof, and floor. The high ceiling of the reverse apex roof makes the inside feel spacious, so it’s a great place to work out or use as a garden yoga room. The bright interior makes it a luxury garden office. There is plenty of room for adding a bed and other furniture for a guest room. If you want an outdoor entertainment space for all weathers, add some chairs and a dining table. It’s a space you and the whole family can enjoy.

            About Your Order:

            The Mercia Thoresby is a UK-made garden room that features sustainably sourced timber. High-quality timbers are used throughout the construction of the garden building. A team of professional installers installs Mercia timber garden rooms. The garden room is supplied untreated and will need an application of wood preservative immediately after installation. 

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

            Professional Home Installation – Included as Standard

            From start to finish, we make the process effortless. Our expert installation service is included in the price of your building, so you can simply sit back and watch your new retreat take shape.

            On the day, our skilled installers will arrive ready to build your garden room with precision and care. Once complete, they’ll leave everything spotless – so all that’s left for you to do is step inside and enjoy your beautiful new space.

            Fully Insulated Design

            This Insulated Garden Room is built with fully insulated walls, roof, and floor to ensure year-round comfort keeping the space warm in winter and cool in summer.

            The Sherwood Range features 100mm thick walls which are double skinned with EcoQuilt insulation layered between the timber cladding. The same high-performance EcoQuilt insulation is also used in the roof. Made in the UK, EcoQuilt is a multi-foil insulation that incorporates an effective vapour control layer, protecting your garden room from damp and moisture.

            For the floor, we use AirTec insulation, designed with a bubble structure that traps air, reducing heat loss by up to 50%.

            EPDM Rubber Roof

            Enhance the durability and weather resistance of your Mercia garden room with our high-quality EPDM roofing solutions. The building comes with EPDM roof covering as standard. Designed to provide superior protection, EPDM is a versatile and long-lasting material that ensures your timber structures remain secure against the elements. Its strong waterproof properties, combined with resistance to UV rays and temperature fluctuations, make it an ideal choice for outdoor use.

            Customisable to Suit Your Style

            Designed with flexibility in mind, The Sherwood garden room is available in a range of sizes and style, that can be tailored to suit your exact needs. Prefer extra windows for more natural light? Need an extra single or double door? No problem. Speak to our friendly team, we’ll work with you to create a layout that’s just right for you. Your perfect garden room, your way.

            Garden Room Aftercare

            The timber insulated garden room is supplied untreated. You must apply a preservative and waterproofing topcoat immediately after installation. Using the treatment after installation, followed by consistent annual treatment of the garden room, will maintain the high-quality finish and is a requirement of the 10-year anti-rot guarantee. A 1-year manufacturer's warranty is included as standard.

            To treat the garden room, elbec recommends Protek wood treatment. Browse our Protek Royal Exterior Wood Finish Paint range to find the best paint colour to add your own personalised finish.  We have selected some of the best-selling Protek Royal Colours as an option on this page, as well as the highly recommended Protek Wood Preserver++

            Does A Garden Room Require Planning Permission?

            The garden building designs have been created to adhere to planning permission guidelines. However, we cannot guarantee that you will not need planning permission for a garden room.  We advise checking with your local authorities before constructing your garden buildings. 

            What Garden Room Base Do I Need?

            A flat, level solid base made of either concrete or concrete slabs is required for the installation of your Insulated Garden Room. You can purchase the Mercia Elite Timber Base With Ground Screws.  For more information on how to build a garden room base, you can contact us.

            Prior to the Garden Room installation, be sure to check the base is level in all directions. If the base is not level, it will cause the building to twist and warp with the natural movement of the timber. It’s essential to adjust your base accordingly to achieve this before the installation process begins.

            Delivery And Installation?

            Since this building includes free professional installation, there’s hardly any effort required on your part!

            You will need to ensure there is a 24” clearance all the way around the building and have the area cleared and ready on the day.  This will allow for the building to be assembled and for you to be able to treat the building.

            Note: The installation team will not dismantle or remove any old buildings.

            Once your order is placed, the manufacturer’s installation team will be in touch with a short pre-installation questionnaire. This helps us confirm that the site for your new Insulated Garden Room is ready, making sure everything runs smoothly on installation day.

            After the foundation is set and access to your garden is clear, our installers will take care of the rest!

            About Mercia:

            Mercia Garden Products is proud to be a British business with over 140 years of 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 sustainably sourced timber, ethically sourced materials in their products and the most advanced manufacturing techniques. Mercia focuses on innovating and improving its products whilst maintaining customer satisfaction, including ensuring safety for both customers and staff.

            Delivery

            Delivery & Professional Installation

            Your new building includes complimentary installation, which means the hard work is taken care of for you.

            Your order is delivered on either a 3.5T, 7.5T or 18T Lorry.  You will be contacted within the delivery timescale and given a date for assembly.

            Once your order is confirmed, we’ll send you a quick pre-installation questionnaire. This helps us confirm that the space where your Insulated Garden Room will be placed is suitable so that everything runs smoothly on installation day.

            Before our team arrives, you’ll just need to ensure there’s a solid, level base ready. If you’ve chosen to prepare your own base, we recommend either a poured concrete foundation or sturdy concrete slabs. Alternatively, you can opt for our Elite Timber Base upgrade, and we’ll handle that for you.

            After confirming that the base and access to your garden meet requirements, we’ll get in touch to schedule a convenient delivery and installation date.

            Delivery Timescales

            These depend on the postal code and confirmation that the base is suitable.

            Specification

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

            Product Name:
            The Mercia Thoresby Premium Insulated Garden Room 4m x 3m
            Installation:
            Included
            Optional Installation:
            Supplied as standard
            Width:
            4.23m (13'11")
            Depth:
            3.96m (12'11")
            Footprint Width:
            4.19m (13'9')
            Footprint Depth:
            3.19m (10'8") - garden room
            0.49m (1'7") - Veranda Depth
            3.68m (12'1") - overall
            Footprint Width (Internal):
            4.00m (13'1")
            Footprint Depth (Internal):
            3.00m (9'11")
            Height to Ridge:
            2.68m (8'11")
            Height to Eaves:
            2.26m (7'7")
            Walls:
            100mm Double skinned walls insulated (with internal 12mm tongue and groove + 72mm framing + external 16mm Shiplap+ and EcoQuilt Insulation)
            Floor Material
            16mm Tongue and groove floor with Air Tec Insulation between the bearers
            Floor Thickness:
            64mm (including framework)
            Floor Joists:
            44mm x 125mm (1 3/4" x 5")
            Floor Joist Direction:
            Front to back
            Roof Type:
            Reverse apex
            Roofing Felt:
            EPDM Roof (50 Year lifespan)
            Roof Material:
            Tongue and groove roof with EcoQuilt Insulation
            Roof Thickness:
            158mm (including framework)
            Roof Joists:
            44mm x 150mm ( 1 3/4" x 6")
            Door:
            1 x timber framed double door (optional exterior uPVC colours in anthracite, oak or white)
            Door Height:
            1.97m (6'6") - door frame
            1.85m (6'1") - door aperture
            Door Width:
            1.62m (5'4") - door frame
            0.76m (2'6" - One door open) - aperture
            1.53m (5' - Both doors open)
            Door Lock System:
            Door Handle and Mortise Lock (Keys Provided)
            Number of Windows:
            2 x top opening windows
            2 x fixed windows
            Window(s) and Door location:
            Window(s) and door location can be personalised with the installer on the day of installation
            Window Material:
            14mm Double glazing, argon-filled, toughened safety glass
            Window Height:
            1.97m (6'6") - window frame
            1.71m (5'7") - window glazing
            Window Width:
            0.76m (2'6") - window frame
            0.60m (1'12") - window glazing
            Optional Roofing Felt Tiles:
            ×
            Optional Base (to be used instead of a concrete base)
            Treatment:
            Untreated (application of preservative and waterproof coat required)
            Recommended Treatment:
            Protek Range (please click here)
            Manufacturer's Guarantee:
            10 Year Anti-Rot Guarantee
            Sustainably Sourced Timber:
            Free Delivery*:
            Product Code:
            20040172
            Manufacturer Code:
            ThoreW4D3
            EAN Number:
            5029442009155
            Manufacturer:
            Mercia Garden Products
            Country of Origin:
            United Kingdom
            Click to View Alternative Sizes:
            5m x 3m

            Quickview

            The 4m x 3m Mercia Thoresby Insulated Garden Room with Veranda is designed for all-year use, making it perfect for a garden office or guest space.  It is made with insulated walls containing EcoQuilt multi-foil insulation for comfort in any weather. The key features include:

            • Free home installation
            • Part of the Premier Sherwood Collection – timeless Nordic luxury
            • Configurable doors and windows – you decide!
            • Double-glazed windows and doors
            • Insulated walls, roof, and floor with EPDM roof covering
            • Customisable design
            • 10-year anti-rot guarantee