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BillyOh Petra Tongue and Groove Reverse Apex Summerhouse

The BillyOh Petra reverse apex summerhouse is a great companion during the summer months and provides a cosy, relaxing space throughout the rest of the year. The large windows and glazed doors fill the comfortable interior with natural light, creating an ideal place to relax or entertain. Available in 6 different sizes, all constructed from strong tongue & groove panelling and with customisable door placement.

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

11mm Tongue and Groove

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 Tongue and Groove

1.7 times thicker than our standard 11mm flooring, our 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.

Mineral felt

Quick and easy to apply, Mineral felt is durable and protects the building against the elements. The mineral felt is also more durable than traditional sand felt, meaning that it does not need to be regularly replaced, making it a long term, cost effective option.

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:

£0.00

Finance from ... a month
Finance Calculation for your £1,439.00 order

Deposit Amount of 10% = ...

I would like to pay over 24 months

Total Cash Price £00.00
Total Amount of Credit £00.00
Deposit £00.00
Interest Rate 14.9% p.a.fixed
Total Amount Payable £000.00
Total Charge fo Credit £00.00
APR representative 14.9%
Monthly Repayment( ) £00.00

Dimensions

  • Strong 11mm Tongue & Groove walls
  • Tall reverse apex design with generous headroom
  • Long, styrene glazed windows for natural light
  • 4ft wide opening double doors for ease of access
  • 28x28mm framing for added strength and stability
  • Timber floor joists to provide a sturdy support on your shed base
  • Premium 11mm Tongue & Groove floor & roof
  • Variable door positioning to suit your needs
  • Mineral roofing felt for added protection
  • Base Coat Treated for Transit
Overall Dimensions (Includes Roof Overhang)
image
  • (A) Width: 3.00m (9ft10)
  • (B) Depth: 2.60m (8ft6)
  • (C) Ridge: 2.34m (7ft8)
  • (D) Eaves: 1.73m (5ft8)

Why buy the Petra Summerhouse?

BillyOh<br/> Guarantee
BillyOh
Guarantee

Protects the wood on your building against rot and decay.

UK<br/> Manufactured
UK
Manufactured

Over 20 years of experience in design and production.

Complete<br/> Building
Complete
Building

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

Extra<br/> Head Height
Extra
Head Height

Crouch free design, giving you the ultimate space.

Key Features

Solid Tongue and Groove

Built using Tongue & Groove panels, the Petra 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.

Generous Height

With a ridge height of 7.6ft or 8.1ft (depending on size), the Petra features the highest headroom amongst the range for added convenience and mobility whilst inside the summerhouse.

High Specifications

The Petra is complete with premium mineral felt that protects your building against harsh weather. High-strength SAN Styrene glazing is used for its impressive UV properties and durable finish that can withstand breakages.

Key features
Panoramic Windows

The Petra is a bright building with windows across the front and double side windows. The tall windows and doors are glazed with shatter-resistant SAN giving you fantastic views and natural light without the worry of glass.

Wide Double Doors

Featuring a 4ft wide central double door entrance, you can conveniently move any of your larger furniture or items with ease.

Stable Structure

The strong 28x28 framing surrounds each rigid panel, creating a robust and stable structure. At seams between panels and corners of the building, this framing will effectively double the same strength as 56x28.

Customer Images

Petra Customer Testimonials

Damian

Frequently Asked Questions

EXPAND ALL COLLAPSE ALL

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 Floor

  • 11mm Tongue & Groove Roof

  • Green mineral roof felt

  • All fixtures and fittings

  • Comprehensive assembly instructions

Spray Treated: Spray treatment comes as standard. Your building will get a beautiful golden brown spray treatment before leaving the factory in order to preserve the quality of the wood up until 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. The Pressure Treatment gives your building a slightly green hue, to begin with, but over time this will age and turn to a beautiful warm brown colour..

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

Roof:

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.

Floor:

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 Petra Summerhouses

The Petra is a bright building with windows across the front and double side windows. The tall windows and doors are glazed with shatter-resistant SAN giving you fantastic views and natural light without the worry of glass.


This wooden summer house lends itself to customisation, and with the range of sizes, you can choose the best one to suit your garden. With only one side having windows, it couldn’t be easier to place your Petra to the side of a garden or patio, making it a fantastic corner summerhouse. Due to the natural light and views given by the windowed front wall, the Petra has many uses and would work great as a home office, summerhouse bar, garden studio or decorate it with all your home accessories to create a relaxing home away from home.


The Petra comes with a beautiful golden spray treatment which can be upgraded to pressure treated for longevity. Your Petra can also be painted as many of our customers have done to match your chosen aesthetic. Please see our customer images for inspiration on what you could do with your garden summer house.


Sizes


This BillyOh building comes in a selection of sizes from 10x8 to 20x10. Our wide range of base sizes for the Petra reverse apex summerhouse is designed to be suitable for all types of gardens and budgets.


Design


The reverse apex design offers increased head height and lends itself to an everyday use office or relaxation room. Apex and reverse apex roof styles are typical in more traditional summerhouses and offer excellent water runoff.


We believe the Petra offers the perfect space for use as a home office or a cosy space to relax at the end of the day. Whatever you use it for, make the most of your outdoor space with a BillyOh Petra summerhouse.


Double Doors


Perfect for opening up during summer parties or on hot days, this traditional take on a contemporary summer house offers wide-opening double doors. There are a whole host of other customisable options including treatment and roofing upgrades.


Treatment


Our garden buildings feature options for trim colours for personal preference - for an alpine shade, opt for a light green, perhaps. We also offer pressure treatment as an optional wood treatment on the Petra summerhouse. This will increase its longevity and your BillyOh guarantee to 15 years against rot, decay, and insect infestation. Green mineral roof felt is included as standard.


Tongue and Groove Cladding


We use high-quality European-sourced summerhouse timber constructed in tongue and groove panels for this model. The Petra is designed for summer but also to stand up to even harsh weather conditions, where tongue and groove timber offers dependable quality and a tight seal.


Tongue and groove construction also gives you the option, for example of varying floor cladding thickness. You can customise your Petra and create an even more weather resistant garden building with sturdy construction, courtesy of our tongue and groove panelling.


Guarantee


On non-pressure treated models, we offer our BillyOh 10-year guarantee against rot and insect infestation. Summer house moisture and ability of moisture to rising in the form of damp make pressure-treating even our high-quality European sourced timber a worthwhile investment.


Planning Permission


Always make sure to double-check your local council rules, but generally planning regulations will allow you to build your Petra summerhouse without permission, if:


  • It is not intended for use as permanent living quarters
  • The eaves height after under 2.5m (the Petra's are 1.73m)
  • The ridge height is under 4m (the Petra's is 2.34m)
  • It is not two-storey
  • It isn't larger than 50% of the area of your garden
  • It isn't built past the front wall of your house

With some basic tools and the assembly instructions provided with your order, you and a friend can have your Petra built in no time. We always suggest mounting your garden building on a sturdy and level footing, like a concrete base.


Customers


And if you want to see how other Garden Buildings Direct customers got on with their Petra summerhouse, check out our customer stories for summer house ideas.


Delivery


Get your Petra wooden summer house with our fast and free delivery service to most of mainland UK in just 1 - 4 weeks. And if you have any more questions, check out our FAQs or get in touch with our friendly team today.

Dimensions 10 x 8 12 x 8 12 x 10 16 x 8 10 x 8 Pressure Treated 16 x 10 12 x 8 Pressure Treated 12 x 10 Pressure Treated 16 x 8 Pressure Treated 20 x 10 16 x 10 Pressure Treated 20 x 10 Pressure Treated
Width 299.6cm 358.2cm 358.2cm 475.4cm 299.6cm 475.4cm 358.2cm 358.2cm 475.4cm 592.6cm 475.4cm 592.6cm
Depth 259.8cm 259.8cm 318.3cm 259.8cm 259.8cm 318.3cm 259.8cm 318.3cm 259.8cm 318.3cm 318.3cm 318.3cm
Width (Internal) 287.4cm 346cm 346cm 463.2cm 287.4cm 463.2cm 346cm 346cm 463.2cm 580.4cm 463.2cm 580.4cm
Depth (Internal) 234.4cm 234.4cm 293cm 234.4cm 234.4cm 293cm 234.4cm 293cm 234.4cm 293cm 293cm 293cm
Ridge Height (Inc Floor) 234cm 234cm 247cm 234cm 234cm 247cm 234cm 247cm 234cm 247cm 247cm 247cm
Eaves Height (Inc Floor) 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm 173.2cm
Ridge Height (Internal) 229.3cm 229.3cm 242.4cm 229.3cm 229.3cm 242.4cm 229.3cm 242.4cm 229.3cm 242.4cm 242.4cm 242.4cm
Eaves Height (Internal) 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm 175.4cm
Door Opening Size (w x h) 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm 114.8cm x 163.9cm
Door Width 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm 58.3cm
Door Height 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm 164.5cm
Minimum Base Width 300cm 358cm 358cm 476cm 300cm 476cm 358cm 358cm 476cm 593cm 476cm 593cm
Minimum Base Length 260cm 260cm 319cm 260cm 260cm 319cm 260cm 319cm 260cm 319cm 319cm 319cm
Glazing Thickness 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm 0.18cm
Materials 10 x 8 12 x 8 12 x 10 16 x 8 10 x 8 Pressure Treated 16 x 10 12 x 8 Pressure Treated 12 x 10 Pressure Treated 16 x 8 Pressure Treated 20 x 10 16 x 10 Pressure Treated 20 x 10 Pressure Treated
Glazing Material Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene
Floor Material 11mm Tongue and Groove 11mm Tongue and Groove 11mm Tongue and Groove 11mm Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Pressure Treated Tongue and Groove
Roof Material 11mm Tongue and Groove 11mm Tongue and Groove 11mm Tongue and Groove 11mm Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Tongue and Groove 11mm Pressure Treated Tongue and Groove 11mm Pressure Treated Tongue and Groove
Roof Covering Material Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt Green Mineral Felt
Features 10 x 8 12 x 8 12 x 10 16 x 8 10 x 8 Pressure Treated 16 x 10 12 x 8 Pressure Treated 12 x 10 Pressure Treated 16 x 8 Pressure Treated 20 x 10 16 x 10 Pressure Treated 20 x 10 Pressure Treated
Windows 6 Windows All Fixed 6 Windows All Fixed 6 Windows All Fixed 8 Windows All Fixed 6 Windows All Fixed 8 Windows All Fixed 6 Windows All Fixed 6 Windows All Fixed 8 Windows All Fixed 10 Windows All Fixed 8 Windows All Fixed 10 Windows All Fixed
Factory Basecoat Treatment Red Cedar Water Based Treatment for Transit Red Cedar Water Based Treatment for Transit Red Cedar Water Based Treatment for Transit Red Cedar Water Based Treatment for Transit Pressure Treated Red Cedar Water Based Treatment for Transit Pressure Treated Pressure Treated Pressure Treated Red Cedar Water Based Treatment for Transit Pressure Treated Pressure Treated
Material Wood Wood Wood Wood Wood Wood Wood Wood Wood Wood Wood Wood
Roof Style Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex Reverse Apex
Cladding Style Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove Tongue and Groove
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.

Assembly

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:

Petra 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.

Damian

"We chose the Petra for the size and also for the windows overlooking the garden and pond. It’s just allowed us to enjoy the garden more and to relax - with all the windows it makes it bright."

Read more

Damian
We’re using it as a summer house for in the evenings watching TV. And also a bbq area to enjoy the garden. I’ve painted the beams grey and the walls white and my favourite thing is the size and how much room inside there is.
We chose it for the price for the size of the building. Our experience was fine, we had 1 split panel which was resolved and sent a new one out straight away. I’d say just make it how you want it - I'm going to be insulating it at some point.

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