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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

Spray Treated

Treated with a beautiful golden brown spray treatment which colours and protects the wood during transit. Designed to last through shipping and assembly, we do recommend treating the wood after installation to protect and preserve it, as well as annual maintenance.

Pressure Treated

An effective way of keeping the wood long-lasting and increasing the longevity of your building. In a pressurised tank, chemical preservatives are forced deep into the wood’s fibres to resist rot or decay. Upgrading to Pressure Treated means the guarantee is extended from 10 to 15 years. Please note Pressure Treatment gives your wood a slightly green hue to begin with, but over time this will age and turn to a beautiful warm brown colour.

2. Personalise your summerhouse

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?

Just Bearers

Designed to be used on top of an existing solid, level base such as concrete or slabs. Pressure treated bearers are a simple and affordable solution to keep your building raised off the ground and away from any standing water, which can cause your building to rot or decay prematurely.

Eze Base

A wooden frame made from pressure treated bearers, designed for soft ground such as soil or gravel. It has a spike in each corner to help secure it to the ground. This base ensures your garden building has a rigid, level base.

Eco Base

An alternative to using a concrete base or slabs. A grid system made from recycled plastic which can be filled with gravel to create a sturdy base for your building.

Shelving is a great way of increasing the usable space in your building by giving you another storage level. Whether your building is for tools, gardening equipment or your own personal workshop shelving will help you keep a tidy, organised space. Depending on which option you choose, your shelving will cover one side, two sides or all around. Each shelf is 21cm deep and can be placed at any height.
Keep rainwater away from the walls with one of our guttering systems. Protect your building from harsh weather conditions and water damage with these great yet simple solutions. Single sided guttering is great for smaller buildings or upgrade to dual gutters for increased protection on larger buildings. Collect the rainwater and use it to water your garden as a cheap and more economical option.

The padlock is a 65mm long shackle which is a high quality security lock with brass finish. The steel hasp and staple is 169mm and is made from electro hardened galvanised steel. It is also supplied with recessed and concealed fittings.

The Silicon and Gun Set uses a silicone sealant which prevents mould and fungal growth and comes complete with a skeleton gun as standard. This product is ideal for sealing in the windows of your garden building!

This is a low cost, convenient solution, perfect if you don't already have your own tools. This kit includes: Hard point saw, Safety goggles, Paint brush, Pocket level, Claw hammer, Rigger gloves.

This unique hasp & staple type shield offers a high level of security by reducing the exposed area of a padlock to the bare minimum. Specifically designed to prevent unwanted entry being gained to sheds, garages & workshops by protecting against break-ins.

Optional Extras:
Total Price:


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  • Traditional apex style
  • Strong 11mm Tongue and Groove walls
  • Wide-opening double doors
  • Traditional Georgian window crosses
  • 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

Solid Tongue and Groove Construction

Built using Tongue & Groove panels, the Harper has a secure and stable structure which is built to last. The interlocking Tongue and Grooves form strong panels, which create a strong structural strength.

Georgian Bar Door and Windows

The Harper has been designed with front Georgian bar windows with styrene glazing. The windows and doors allow lots of natural light to enter the building, which is great for spending long days inside relaxing.

High Strength SAN Styrene Glazing

Durable Single SAN glazing is included as standard. SAN is used for its UV properties, and the tougher finish avoids breakages.

Key features
Tall Eaves

The Harper features a tall Apex roof offering plenty of headroom. With 4”9” eaves head height, the Harper ensures convenience and mobility whilst inside the summerhouse and makes it feel fresh and airy.

Wide Double Doors

The 1.1m (3 ½ ft) wide opening double doors ensure ease of access in and out of the summerhouse and, on a summer's day, can be left open to allow the warm summer breeze inside.

Full Span Windows

The long windows of Harper provide natural lighting inside the summerhouse and enable you with fantastic views of your garden and create a spacious feel to the whole summerhouse.

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.

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 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.

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: