12' x 8' Forest Timberdale 25yr Guarantee Tongue & Groove Pressure Treated Windowless Double Door Combination Apex Shed (3.65m x 2.52m)

Product Code: BFD26470
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  • Forest's Premier Shed - handcrafted in the heart of Worcestershire
  • Pressure-treated wood for complete maintenance freedom, with a market-leading 25-year anti-rot guarantee
  • Windowless design for enhanced security
  • Strongest shed in its category: 12mm tongue and groove throughout, a strapping 66 x 33mm internal frame, plus security-enhanced ledged and braced (Z-frame) doors
  • Premium wood flooring and roof - 12mm tongue and groove (plus pressure-treated floor bearers and 140g reinforced-polyester mineral felt roof cover)
  • Intelligent modular design for an easier assembly and versatile door configuration
  • White Glove Delivery Service straight into your garden, with optional professional installation service
  • For more information about our shed base options click here

Recommended if you do not have a solid, level base, such as concrete or paving, on which to place the shed floor bearers (floor and bearers included as standard).


Installation is typically within 2 - 3 weeks of delivery for this product. Our Shed Installation applies to the shed only. If you have purchased our wooden base for which you also require installation, you should select the Shed & Wood Base Install option which includes the shed and the base. Please note that we do not install plastic bases or other accessories. We will contact you after checkout to arrange your installation date.

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12' x 8' Forest Timberdale 25yr Guarantee Tongue & Groove Pressure Treated Windowless Double Door Combination Apex Shed (3.65m x 2.52m) Technical Drawing
Brand Forest Garden
Cladding Tongue and Groove
Cladding Thickness 12
Construction Type Tongue and Groove
Door Type Double Doors
Eaves Height 1851
Frame Type Smooth Planed All Round (PAR)
Framing Size 33x33mm
Size 12' x 8'
Ridge Height 2412
Roof Covering Premium Mineral Felt
Roof Style Apex
Material Wooden
Treatment Pressure treated
Guarantee 25 years
Depth at Base 3540
Depth including Overhang 3652
Width at Base 2360
Width including Overhang 2518
Door Width 1413
Locking System Rim Lock
Floor Material Tongue & Groove Boards
Floor Thickness 12
Roof Material Tongue & Groove Boards
Roof Thickness 12


Forest is Britain's leading manufacturer of wooden sheds and Timberdale is their premier line. It should be your go-to range of sheds when only the best will do. Beautifully handcrafted in the heart of Worcestershire and supplied with a market-leading 25-year anti-rot guarantee, this 12x8 Timberdale Windowless Double Door Combination Apex Shed (3.65m x 2.52m) makes an excellent choice if you require a top-quality wooden shed with compartmentalised garden storage space.

Intelligent Modular Design and Premium Build

Expertly built from superior 12mm tongue and groove cladding, on a strapping double 33mm frame (66 x 33mm), this garden shed simply oozes class. Its smart modular design means that it's delivered to you in smaller sections but you get more wood, so you'll find it far easier to assemble than other wooden sheds, and much stronger too. This modular design has the added benefit of allowing you to choose the door placements to suit your exact requirements.

Tongue and Groove Floor PLUS Roof

The floor is also built from premium 12mm tongue and groove, so is perfectly equipped to accommodate your heavier items and will easily cope with regular footfall. Pressure-treated bearers allow good air circulation underneath the shed, which prevents the wood getting damp, providing another layer of protection against rot and fungal decay in this key area.

The 12mm tongue and groove roof sports a traditional apex design. It is fitted with a superior 140g reinforced-polyester mineral felt cover for unbeatable weatherproof protection (roof felt colour may vary). The high roofline offers you ample headroom and increases your garden storage options, while 2 diamond-shaped finials add the finishing touches to the shed's incredibly attractive appearance.

Compartmentalised Garden Storage Space

You can gain very easy access to the larger storage area via generously-sized, ledged and braced double doors. They include exterior turn buttons, interior bolts and a key-operated lock, so rest assured that your valuable tools will remain completely safe.

Separated from the larger storage area by premium tongue and groove cladding, the smaller storage space comes with its own ledged and braced door. This is fitted with exterior turn buttons, interior bolts and a key-operated lock too, and can be hung for a left or right-hand opening.

The shed's windowless design provides yet another layer of security by deterring unwanted attention.

Ethically-Sourced Wood and Completely Maintenance Free

This 12x8 shed is built using FSC®-certified wood, which is the world's most trusted mark for sustainable forestry. It is pressure treated to prevent rot and supplied with an extraordinary 25-year anti-rot guarantee, which is the longest on the market. Retreatment is never required, saving you money and leaving you more time to enjoy your garden.

Britain's Best Range of Wooden Sheds

The Forest Timberdale range of tongue and groove, pressure-treated sheds consists of a number of different sizes and styles. What they all have in common is a smart modular design and superior build, achieved by using the same attention to detail and top-quality materials throughout.

Forest's White Glove Delivery Service

Free delivery is available to most UK postcodes using Forest's White Glove Service. This means the shed is delivered straight into your garden, with all of the product packaging removed.

Fixings and instructions are both included to help you achieve a straightforward assembly. If you'd rather the professionals do the work for you, we offer a competitively-priced installation service as an optional upgrade.

  • Forest's Premier Shed - handcrafted in the heart of Worcestershire
  • Pressure-treated wood for complete maintenance freedom, with a market-leading 25-year anti-rot guarantee
  • Windowless design for enhanced security
  • Strongest shed in its category: 12mm tongue and groove throughout, a strapping 66 x 33mm internal frame, plus security-enhanced ledged and braced (Z-frame) doors
  • Premium wood flooring and roof - 12mm tongue and groove (plus pressure-treated floor bearers and 140g reinforced-polyester mineral felt roof cover)
  • Intelligent modular design for an easier assembly and versatile door configuration
  • White Glove Delivery Service straight into your garden, with optional professional installation service
  • Shed consists of compartmentalised garden storage space
  • Double doors to larger storage area and single door to smaller storage area
  • FSC®-certified wood
  • High roofline for increased headroom and storage options
  • Choose a Timberdale Shed from a range of designs and sizes

Shed Base Options

Wooden Shed Base

Wooden Shed Base Kit

As an alternative to laying slabs or concrete, this shed base is a faster, more cost effective DIY solution.

The wooden shed base consists of a framework that is made from UC4 incised timber which has been pressure treated. The pressure treatment ensures that the framework is robust and is guaranteed to resist rot for an impressive 15 years.

Size of base: 7.5cm (h) x 241.6cm (w) x 354cm (d)




Plastic Shed Base

Plastic Shed Base Kit

Quick and simple to install, the 12x8 plastic shed base kit is ideal for avoiding the hassle of laying slabs or concrete when preparing a base for a new shed. Its interlocking design makes it easy to put together and, though lightweight, it provides a very strong and durable base for the shed. Made from 100% recycled plastic, this shed base is eco-friendly. Also, it can be reused if the shed is repositioned. The base allows for ventilation and drainage under the shed, helping to keep the shed floor dry.

To install the base, simply interlock the square grids together and lay onto a firm, level area of ground. We recommend using 15kg of 10mm pea gravel per square (gravel not included). Each square is 500 x 500 x 40mm. This pack contains 40 squares and heavy-duty, commercially-graded weed membrane.

Please be advised that we do not assemble plastic shed bases as part of our installation service. You must prepare the base yourself in advance of the installers' visit.

Why Choose a Forest Tongue & Groove Timberdale Shed?

Supplied with a market-leading 25-year anti-rot guarantee as standard, Timberdale Sheds are robust, durable and packed full of premium features. Their tight, interlocking tongue & groove construction forms an unbeatable weatherproof seal and makes for an exceptionally attractive appearance.



Why you need a Forest Timberdale Tongue & Groove Shed?


With their tongue & groove build, substantial framing and high-end features, Forest’s Premium Timberdale Sheds offer you robust, practical and exceptionally stylish garden storage. Also, although there’s a slightly higher initial outlay when purchasing one of these sheds, the wood’s pressure-treated protection saves you both time and money in the long run, 25 Year Life Anti-Rot Guarantee means no time-consuming, costly retreatments are required. 


1. Pressure Treated Fully Modular Design

Pressure treatment forces preservative deep inside the timber. The result is long-lasting protection against rot and fungal decay. With a market-leading 25-year anti-rot guarantee, there is no need to re-treat EVER, saving time and an estimated £200 in treatment costs compared to dip treated sheds. Interchangeable modular framed sections allow ease of assembly and flexibility of door and window positioning. Single doors can be hung to be left- or right-hand opening.

2. Traditional Finial & Barge Board

Attractive smooth planed finial & barge boards.

3. Doors with Double Z Framing

Far stronger and more secure than those found on other wooden sheds, Forest Timberdale Shed doors are reinforced with sturdy double-Z framing. This prevents them from warping, sagging or dropping. 

4. Traditional Rim Lock Door Latch

Heavy-duty hinges, interior bolts and a rim lock add even greater security, keeping your valuable tools safe from unwanted attention.

5. Sturdy Floor

The robust and stable 12mm tongue and groove floor is elevated by pressure-treated joists for extra protection from ground moisture. Due to its thickness, a tongue and groove floor improves the shed’s level of insulation and will neither buckle under the weight of heavier items nor regular footfall.

6. Premium Safety Glass

Providing ventilation and light for a pleasant working and storage space, the opening windows are made from premium 4mm toughened safety glass and are secured with high-quality latches. To suit your garden, the windows can be placed on either side of the apex models. The windowless versions are designed for even greater security, as they deter unwanted attention.

7. 12mm Tongue & Groove Construction

Timberdale sheds are built from interlocking 12mm tongue & groove boards, which are robust, durable and supremely weathertight. Completely resistant to warping too, these sheds come with a 66mm x 33mm frame, which is 30% thicker than most wooden sheds. This extra framing ensures even greater strength and stability.

8. High Quality Roof with Superior Felt

The premium Timberdale shed range roofs are made from 12mm tongue and groove wood, fitted with a superior 140g reinforced-polyester mineral felt cover for complete weatherproof protection and a stylish finish. Don’t underestimate the importance of a top-quality roof as it’s your shed’s first line of defence against the elements.

Premium Modular


Premium quality, high strength, Tongue & Groove modular framed design.

Modular panels - add more timber with the framing around each panel increasing overall shed strength.


Strong and long-lasting construction - made with 30% more timber than conventional sheds.

Window Panels

Window panels can be interchanged with other panels of the same size and can be placed on either side of the shed, see example of the 8x6 Timberdale Shed above.

Door Positions 

Doors that can be fitted in different ways to suit your needs.





Pressure Treatment Process Explained

The Pressure Treatment process for timber has been applied to products for a number of years; the key benefit of this process is that the preservative is forced under vacuum pressure right deep into the heart of the wood and the grain structure. The preservative becomes an integral part of the wood; giving a long life and protection against rot.


This process also means that you never have to apply preservatives to your garden shed, and it allows the natural colours of the timber to show through and so your shed blends easily within your garden. Surprisingly, our Pressure Treated Sheds are only slightly more expensive than Dip Treated Sheds.


Timber is loaded into chamber and a vacuum empties timber cells of air.


Cylinder is flooded under vacuum with preservative.


Preservative is forced deep into timber using hydraulic pressure.


Another vacuum extracts excess preservative.



Timber draws in surface excess of preservative under low pressure, then is left to dry.



Timberdale Range by Forest

What makes a Forest Timberdale Shed unique?

What makes a Forest

Shed unique?

For over 50 years we have been the UK's leading manufacturer and distributor of high quality hand built sheds with over 2 million made!

We are proud to be a Carbon Neutral British company using sustainable British Timber. Excellent customer service is at the heart of our operation, backed up by an industry leading distribution.

A Forest Shed: 25 year guarantee, the longest on the market

Other sheds on the market: 10 year guarantee

A Forest Shed: Maintenance free, no need to ever treat

Other sheds on the market: Must be treated straight away and then annually

A Forest Shed: Solid timber floor

Other sheds on the market: OSB floor

A Forest Shed: White Glove Delivery service into your garden

Other sheds on the market: Pallet left on your drive

A Forest Shed: All your packaging removed

Other sheds on the market: All your packaging left and a trip to the recycling centre needed!

Trustpilot Reviews

Forest Timberdale Tongue and Groove Shed Features

From The Supplier: Forest Garden


"We're proud to be the largest and most trusted manufacturer and distributor of garden timber products in the UK" - Forest Garden

Making British Gardens Great


At Forest, we know a fair bit about fences. And sheds for that matter. In fact, we've been one of the UK's most trusted manufacturer and distributor of quality wooden garden products for over 50 years.


With two sawmills in the UK processing locally-sourced timber, and a Head Office in Hartlebury, Worcestershire, you’ll find our range of garden buildings, fencing, decking and decorative structures for sale across many sites online and in over 3,000 retail stores. From the forest to the doorstep, we are involved every step of the way to ensure we bring you the best product and service.


Well made in Britain


The majority of the timber we use is grown and felled from managed UK forests across Scotland and Wales. After felling, the timber is cut and processed in one of our nearby sawmills and taken to our manufacturing operation in the heart of Britain. It is here our skilled workforce proudly produce the widest range of garden buildings, fencing and structures available in the UK.


All of the products that we sell are dispatched from this site. The final part of their journey is managed by our dedicated delivery department who are responsible for distribution direct to customers' homes by our fleet of vehicles.


Home Grown


We're proud to say that the majority of the timber we use is cut in our very own sawmill from trees grown in the UK.


Not only that, but our range is certified by the Forest Stewardship Council and the majority of our products carry the FSC logo - so you know that our timber is ethically sourced from well-managed, sustainable forests that are replanted for future generations.


(Certification number TT-COC-001790, Issue date 5 March 2015)


Helping Everyone Thrive


We like to do our bit for charity and are proud to support Thrive. Thrive uses gardening as therapy to bring about positive changes in the lives of people living with disabilities or ill health, or those who are isolated, disadvantaged or vulnerable.





"We are excited and proud to be a carbon neutral business. We work with Carbon Neutral Britain, the UK’s leading offsetting initiative provider to offset our environmental impact."

- Forest Garden

We Are Now Carbon Neutral!


We believe that a successful business is also a responsible business. This includes being dedicated to playing our part in protecting the environment, supporting our community and making sustainable choices. It also means that we value our colleagues and their welfare, putting policies into practice to make sure we are an employer of choice in our field. For us, this is a passionate commitment that runs through everything we do.


All of us who work with Forest Garden can be proud of what we do and this is embodied in the 3 fundamental principles - Keeping It GreenSupporting Our Colleagues and Supporting Our Community.

Forest Pro-Installation Service


We offer our Pro-Installation Service on a wide range of our garden products. To add installation for this product, please select it from the Installation Options drop-down box at the top of this page.


What happens after I order?


The manufacturer will contact you via email and send you a base preparation document. This contains important advice on preparing a base and information about the installation process.


Once a delivery date has been booked, the installation team will contact you to arrange an installation date. They aim to book this as close to your delivery date as possible, so it is important you check your delivery and contact them in the rare event anything is missing or damaged.


When will we install your garden building?


We aim to carry out your installation within 2 - 3 weeks of delivery. If you were able to choose your delivery day when you placed the order, we will contact you if we need to change this date.


Either way, the team will call you the week before installation to finalise details and help ensure a successful installation on the day.




Forest DDH Delivery
Forest DDH Delivery

Delivery is FREE to the majority of UK mainland postcodes. For all fencing and decking orders, we offer FREE delivery for all orders over £100 (£24.99 for orders under £100). To check you qualify for Choose Your Delivery Day, please use the postcode checker above or within checkout to check delivery is available to your area. If a delivery day is not specified, we will contact you to arrange one.


Choose Your Delivery Day is NOT available for CO, CT, EX, IP, ME, NR, PL, TN, TQ, TR and Scottish postcodes. Here, delivery is 2-3 Weeks from the order date.


A delivery surcharge applies to the following postcodes:  £19.99 - BH, BN, CT, PO1-22, SO31,40-45, TN.  £29.99 - DT3-9.  £39.99 - SA, TA.  £59.99 - DD, DG, EH, EX, FK, G, KY, PL, ML, TD, TQ, TR1-20,26-27.  £69.99 - KA1-26,29-30, PA1-19,21-38, PH1-40,49-50.  £79.99 - AB.  £99.99 - IV1-40,63-99, KW1-14.


We aim to deliver within the advertised lead-time however for the postcodes listed above it can take up to 5-10 days extra.


Please note that delivery is NOT available to Northern Ireland (BT1-99), the Channel Islands (GY1-9 and JE1-5), Isle of Wight (PO30-41,49), Isle of Man (IM1-9), Isles of Scilly (TR21-25) and Scottish Islands (HS1-9, IV41-56, KA27-28, PA20,41-80, PH41-44, KW15-17).


Two days before delivery, you will receive a 4-hour time slot via text message. You are able to respond to this text and we welcome any helpful delivery instructions to ensure a successful delivery. Then, on the morning of delivery, you will receive a 2-hour ETA via email. This includes a link to track your driver’s progress.


Upon arrival, the friendly driver will deliver your order to a place of your choice - as long as it is a reasonable request and it is safe to do so - within your garden. Please ensure they have unrestricted access, which does not involve passing through your home or garage. We would not risk damaging your property whilst delivering a product to an un-safe location. All product packaging will be removed and taken away with the driver!

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