BillyOh Harper Tongue and Groove Apex Summerhouse

The BillyOh Harper tongue and groove summerhouse is designed with interlocking cladding panels and Georgian bar windows, giving it a traditional look and a strong build. The apex design allows for increased headroom inside this summerhouse, making mobility extremely easy. Available in a range of different sizes, the Harper can fit in all types of garden styles and sizes.

1. Select Size

Size measured in feet

2. Select Treatment

2. Personalise your summerhouse

3. Add optional extras

Discover our range of BillyOh accessories that allow you to customise your very own garden building to very last detail.

Optional Extras:
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  • Traditional Apex Style
  • Strong 11mm Tongue and Groove walls
  • Wide Opening Double Doors
  • Classic Georgian Window Crosses Design
  • Floor and roof included as standard
  • Complete with felt, fixtures and fittings
  • Base Coat Treated for Transit
Overall Dimensions (Includes Roof Overhang)
  • (A) Width: 2.60m (8ft6)
  • (B) Depth: 2.41m (7ft11)
  • (C) Eaves: 1.49m (4ft11)
  • (D) Ridge: 2.10m (6ft11)

Why buy the Harper Summerhouse?

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<br/> Construction

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

Complete<br/> Building

Floor, Tongue and Groove roof and roof felt as standard.

Key Features

European Sourced Timber

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

Galvanised Ironmongery

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

Durable Tongue & Groove

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

BillyOh Harper Tongue and Groove Apex Summerhouse
Green Mineral Felt

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

Wide Opening Double Door

Giving you easy access in and out of your Summerhouse, great for relaxing.

Shatterproof Glazing

Durable Single SAN glazing included as standard.

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 & Groove Wall panels

  • 11mm Tongue & Groove Roof

  • 11mm Tongue & Groove Floor

  • 2 Georgian style single glazed windows

  • Georgian style single glazed double doors

  • 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.

Pressure Treated: For an extra level of protection, you can opt for a pressure treated building which is an effective way of keeping the wood long lasting. This is an extra step in the manufacturing process where the wood is treated in a pressurised tank. Chemical preservatives are forced deep into the wood’s fibres to resist rot, decay and termites. When you upgrade to Pressure Treatment, the guarantee is extended from 10 to 15 years.

With the Harper an 11mm tongue and groove floor and roof is included but you can upgrade to 19mm to suit more intensive use.


11mm: Our standard roof option, this interlocking roof provides a reliable covering for any building. The Tongue and Groove not only gives your building a stronger roof but also a premium look and feel.


11mm: Our Standard flooring option which provides a durable, solid foundation and underfoot to the building. The 11mm option is ideal for less demanding and frequent usage, suitable for lighter intensity purposes like summer houses and other living spaces containing light furniture. The 11mm tongue and groove timber makes this a solid yet suitable, economical option.

19mm: A premium floor is the perfect choice for higher intensity usage. The construction uses thick 19mm tongue and groove timber, which gives you not only the strength, but better insulation against the cold weather. This specific floor is the perfect option if you’re planning on using the building as an everyday use office, gym or games room with heavy objects.

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 you want to build your own base, from a sturdy material such as concrete or flagstones, you can find minimum dimensions for each size of this building in the tech specs. In order to protect your building from moisture, you should leave a 2ft gap around the exterior of your building, so remember to take this into consideration when laying any sort of base.

Our robust and simple to use EcoBase provides you with a firm, long-lasting foundation with suitable drainage for your garden building. It is quick and easy to install through the use of snap connectors that link the grids to each other.

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.

BillyOh Harper Apex Summerhouse

The Harper is a classic summer house with crossed Georgian style windows and a beautiful apex roof. The tall windows which cover the front of this summerhouse give you excellent access to natural light, creating an open, relaxing environment to work, chill out or play. This garden room comes in multiple sizes, offering you a range of options to suit your garden.

An 11mm tongue and groove floor and roof are included along with green mineral roof felt to complete your building. A 19mm flooring upgrade is available for a more robust construction, fantastic for garden offices and summerhouse bars. Pressure treatment is also available to strengthen your building and increase your BillyOh guarantee to 15 years.

Harper Tongue and Groove Wooden Summerhouse Garden Room

The traditional apex roof offers increased headroom as well as a long-lasting style suitable for any garden space. The windowed front windows with the windowless side walls offer you a range of lighting options within your building, giving you cool shaded areas to relax, keeping you cool during the warmest part of the day but still having space to sit in direct sunlight.

The smallest 4x8 summerhouse offers you a great small, secure seating area with great access to natural light. This could fit perfectly onto a patio space or at the bottom of a garden giving you great space to sit no matter the weather. The larger sizes offer more space for bigger furniture sets which can be great for hosting or a family room.

Your Harper apex summerhouse can be a cosy space for relaxation or even some extra space for storage or entertaining - there are a multitude of purposes.

Pressure Treatment

With our wide range or summer houses we like to offer pressure-treatment where possible. This will better protect your building against rot and even harsh British weather as well as insect infestation. It's just one of plenty of options to customise your garden building for use beyond the summer months.

Timber and Guarantee

At Garden Buildings Direct, we strive to offer cheap summer houses that are low on price but not quality. Our BillyOh summer houses use high-quality European-sourced timber and tongue and groove cladding to protect your outhouse against even harsh weather conditions. A tongue and groove summerhouse provides sturdy construction and a tight seal against water ingress.


We don't offer an installation service on our BillyOh products. Instead, simply follow the assembly instructions provided with your order and construct your Holly summerhouse with Georgian window design onto a level base in as little as a few hours!

Garden Buildings Direct

Pick your dream wooden summer house today at an affordable price. Simply enter your delivery address to see our fast and free delivery to mainland UK*. And if you have more questions about your BillyOh building check out our FAQs or even get some audience insights from our customer stories.

Otherwise, you can always get in touch with our customer service team.

Dimensions 4 x 8 8 x 8 10 x 8 8 x 8 Pressure Treated 12 x 8
Width 260cm 260cm 260cm 260cm 260cm
Depth 123.8cm 241cm 299.6cm 241cm 358.2cm
Width (Internal) 234.4cm 234.4cm 234.4cm 234.4cm 234.4cm
Depth (Internal) 111.6cm 228.8cm 287.4cm 228.8cm 346cm
Ridge Height (Inc Floor) 210cm 210cm 210cm 210cm 210cm
Eaves Height (Inc Floor) 149cm 149cm 149cm 149cm 149cm
Ridge Height (Internal) 205cm 205cm 205cm 205cm 205cm
Eaves Height (Internal) 151.1cm 151.1cm 151.1cm 151.1cm 151.1cm
Door Opening Size (w x h) 111.6cm x 169.1cm 111.6cm x 169.1cm 111.6cm x 169.1cm 111.6cm x 169.1cm 111.6cm x 169.1cm
Door Width 55.4cm 55.4cm 55.4cm 55.4cm 55.4cm
Door Height 169.6cm 169.6cm 169.6cm 169.6cm 169.6cm
Minimum Base Width 242cm 242cm 242cm 242cm 242cm
Minimum Base Length 119cm 237cm 295cm 237cm 354cm
Features 4 x 8 8 x 8 10 x 8 8 x 8 Pressure Treated 12 x 8
Door Style Double Doors Double Doors Double Doors Double Doors Double Doors
Windows 2 windows (all fixed) 2 windows (all fixed) 2 windows (all fixed) 2 windows (all fixed) 2 windows (all fixed)
Factory Basecoat Treatment Red Cedar Water Based Red Cedar Water Based Red Cedar Water Based Pressure Treated Red Cedar Water Based
Material Wood Wood Wood Wood Wood
Roof Style Apex Apex Apex Apex Apex
Cladding Style Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove
Locking System Turn Button Turn Button Turn Button Turn Button Turn Button
Pre-Assembled Side Panels Yes Yes Yes Yes Yes
Supplied with Fixtures and Fittings Yes Yes Yes Yes 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.

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