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BillyOh Tongue and Groove Tall Sentry Box Grande

Perfect for a smaller garden, the Sentry Box Grande is ideal for storage. Whether it's for Gardening tools, DIY equipment, or simply clearing up space in your garden. With a high apex roof, tall door and strong tongue and groove panelling, it’s ideal for easy access and storage. Complete with Floor, Roof and Felt as standard.

3 x 2 Sentry Box Large

3. Add Extras

Complete your building with optional shelving, guttering, base options, assembly kits and more.

Do you need high quality padlocks, paint, silicone and assembly kits?

Optional Extras:
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  • Compact footprint ideal for small gardens
  • Sturdy Tongue and Groove walls
  • Convenient corner shelves included
  • Increased roof and door height for easy access
  • Floor and Roof as standard
  • Complete with felt, fixtures and fittings
  • Base Coat Treated for Transit
Overall Dimensions (Includes Roof Overhang)
  • (A) Width: 1.13m (3ft8)
  • (B) Depth: 0.65m (2ft1)
  • (C) Height: 1.90m (6ft3)

Why buy the Tall Sentry Box Grande?

BillyOh<br/> Guarantee

Protects the wood on your building against rot and decay.

UK<br/> Manufactured

Over 20 years of experience in design and production.

Easy To<br/> Assemble
Easy To

Made of pre-assembled tongue and groove panels, this shed is simple to assemble yourself.

Complete<br/> Building

Floor, Roof, Felt and Fixings all included as standard.

Key Features

European Sourced Timber

Our carefully sourced timber is purposely selected to ensure dependable quality, creating a robust and reliable building.

Durable Tongue & Groove

The Tongue and Groove boards interlock with one another to form a tight seal offering high quality weather protection.

Green Mineral Felt

Quick and easy to apply, our premium mineral felt is durable and protects your building against harsh weather.

Key features
Windowless Design

To keep your belongings safe, secure and out of sight.

Galvanised Ironmongery

Heavy duty hinges and latches included, galvanised for maximum weather protection.

Shelves Included

Compact corner shelves included as standard to maximise your storage space.

Sentry Box Grande Customer Testimonials


Frequently Asked Questions


The BillyOh guarantee covers this building against:

  • rot
  • decay
  • insect infestation

Please note: The guarantee does not cover timber splits or warping which may occur naturally over time.

Duration of Guarantee:

  • Tongue and Groove Buildings - up to 10 years
  • Log Cabins - up to 10 years
  • Pressure Treatment Buildings - up to 15 years

For more information about BillyOh Guarantee, please visit our terms and conditions

    11mm Tongue and groove wall

    11mm Tongue and groove floor

    11mm Tongue and groove roof

    Boarded single door

    Green mineral roof felt

    All fixtures and fittings

    Comprehensive assembly instructions

Spray Treated: Our sheds and summerhouses get a beautiful golden brown spray treatment before leaving the factory in order to preserve the quality of the wood up until the delivery. As this only lasts through the transit stage, we do advise treating the wood after installation to protect and preserve it, as well as annual maintenance.

Yes, all garden buildings should be assembled on a firm and level base. A base will ensure your building has a solid, long-lasting and well-drained foundation.

If your building is shorter than 2.5m you should not require planning permission, (unless it’s more than 50% of your garden or will be placed in your front garden). Planning permission rules can vary by area so we would strongly recommend checking your local council rules before purchasing a garden building from us.

We do not offer an installation service on any of our buildings, as they are designed to be easy and simple to assemble. Using the digital assembly instructions included in your order confirmation and with a team of at least 2 people, the handy pre assembled panels mean you will have your BillyOh building up in no time!

Our sheds and summerhouse are delivered in easy to assemble panels. For your convenience the panels are no wider than 4ft so they can be easily maneuverable and fit through a standard doorway. Glazing and any additional wood is delivered in separate, clearly labeled packages.

Your order can be tracked through the account section on our website or by contacting us directly. You will be contacted after your order via your online account, email or text to provide updates on delivery dates.

We offer a pay by finance option on any purchase over the value of £560.

Our simple finance options allow you to spread the cost of your purchase over 24, 36 or 48 months.Read more about our Pay by Finance option here.

BillyOh Tall Sentry Box Shed Grande

If you want to make the most of your outdoor space without giving up your whole garden, or have limited room to work with, the BillyOh Grande is the ideal small storage shed for you. This tall storage unit offers plenty of space with a compact 3x2ft footprint to help you tidy up garden clutter. An apex-roof design also provides extra vertical space in this tall garden storage model, allowing extra vertical storage for gardening tools as well as loads of headroom.

Tongue and Groove Sentry Box

Whether it's for any combination of garden tools, camping equipment, or outdoor equipment this compact garden essential offers ample storage space to help you keep your garden tidy. You'll be surprised at how much internal space the Sentry Box Grande offers, with sufficient space for power tools, spades or brushes, and even collapsable garden furniture! Install a handy storage shelf for even more capacity!

The extra height and lockable doors on this secure space is more than enough for a small lawn mower, garden equipment, and even smaller garden furniture. Get maximum storage capacity with a minimum amount of space taken up, with the ample floor space offered by the BillyOh Grande. Plus, tongue and groove boards for the floors, groove cladding for the walls and even a tongue & groove roof offer protection and stability at every point of this building.

Weather Resistant

Make sure your belongings safe in even harsh British weather with a storage shed made from a high-quality and durable material like our European-sourced timber. T&G cladding also creates a tight seal to make the BillyOh Grande even more weather-resistant.

Roof Overhang and Style

The apex roof of this tall sentry box has a height of 1.90m (6ft3). Not only does this offer increased headroom when inside, but the max eaves height fall under 'permitted development' for planning permission.

Installation and Assembly

We don't offer an installation service on the BillyOh Tall sentry box because it's so simple to put together! Whilst assembly is required, you and a friend with some basic tools can easily follow the assembly instructions to have your Grande sentry box up in a matter of hours.


We suggest investing some time in base preparation before your sentry box is delivered. With a sturdy tongue and groove floor, simply construct your storage shed onto a level base like the timber bearers or Ecobases that we sell, or level paving slabs to give this building a solid foundation.

Garden Buildings Direct - Delivery Times

With a fast and free mainland delivery service to most of the UK, simply enter your delivery address and postcode to get started! We can have your BillyOh tongue and groove sentry box with you in as little as 1 - 4 weeks.

For that extra bit of additional storage in your garden, you can't go wrong with the BillyOh Sentry Grande - an effective-yet-stylish storage solution.

Width 113cm
Depth 64.6cm
Eaves Height (Inc Floor) 166.5cm
Ridge Height (Inc Floor) 190.1cm
Width (Internal) 87.4cm
Depth (Internal) 58.6cm
Eaves Height (Internal) 166.5cm
Ridge Height (Internal) 182cm
Door Opening Size (w x h) 73cm x 160cm
Door Height 163.5cm
Door Width 72.8cm
Floor Material Tongue & Groove
Roof Material Tongue & Groove
Roof Covering Material Felt Roofing
Roof Style Apex
Cladding Style Tongue and Groove
Factory Basecoat Treatment Optional - Dip Treated or Pressure Treated
Material Wood
Supplied with Fixtures and Fittings Yes
Locking System Turn Button
Pre-Assembled Side Panels Yes
Please Note: This product has been designed as an affordable solution to most popular light domestic uses. All products supplied self assembly flat packed unless otherwise stated.

Videos & Guides

Our resource library offers step by step instructions, explanation videos and customer content to help you to plan, buy and build your garden building.


We do not offer an installation service on any of our buildings, as they are designed to be easy and simple to assemble. Using the digital assembly instructions included in your order confirmation and a team of at least 2 people, the handy pre-assembled panels mean you will have your BillyOh building up in no time!

See just how easy our buildings are to assemble in this video:

Sentry Box Grande Customer Testimonials

We love to catch up with our customers to see how they’re getting on with their garden buildings. Check out how some of our customers have decorated their garden building and read what they had to say about it.


"Garden Buildings Direct offered exactly what I was looking for following a Google search. Erecting was very straightforward with all parts fitting well."


"Delivery was smooth and I liked that there was no packaging that we needed to get rid of. There were more than enough nails, screws etc so you didn’t have to chase after them (like with some other flat-packed stuff)."