Octagonal Summerhouses


Octagonal Summerhouses

From £8,057

Enjoy entertaining all year long in the traditional octagonal-shaped Prima summerhouse measuring 3m, the perfect size summerhouse for the smaller garden.

The size can be increased in half metre increments and the doors, windows and colours changed as you please. Take a look at some popular design examples or talk to the team about a completely bespoke summerhouse.

4.8/5 Based on 109 reviews



See details & spec for more information on available sizing.

*All prices include VAT. For assembly between 50-75 miles from BA14-0DT add 20%. For 75-100 miles, add 30%. Within M25 and over 100 miles, add 40%.

Size guide Enquire

Included as standard

  • 3m Summerhouse
  • 19mm Tongue & groove floor
  • 28mm Thick walls
  • 2x Decorative copper cap
  • Choice of five roof shingle colours
  • Delivery to the UK via articulated lorry - delivery charges for a smaller vehicle will apply where access is restricted

Optional extras

*Only available with Garden Affairs assembly

Total cost:

Building Cost


Summerhouse Features

28mm / 44mm Thick Walls

The high-quality summerhouse can be built in 28mm or 44mm slow-grown Nothern European Spruce.

Available for DIY Assembly

The Summerhouse can be installed as a DIY project, complete with fittings and instructions, or assembled by our team of experts.

Fully Customisable Design

The Octagonal Summerhouse might be the summerhouse for you. But if not, the building can be fully customised to suit.

Traditional Pitched Roof

The classic pitched roof allows for extra internal height and comes finished in a choice of five popular shingle colours.

Double Glazed Doors & Windows

The doors & windows are all timber-framed and double-glazed as standard. Add timber glazing bars to add to the traditional design.

  • Details & Spec
  • Custom Options
  • Advice & Resources
  • FAQs

Details & Spec

The Prima Octagonal has a premium quality, bitumen felt shingle roof in a choice of five attractive colours: Black, Blue, Red, Green or Brown. Alternatively, a cedar shingle roof or a traditional slate-effect roof is offered on installed summerhouses.

The Prima Octagonal is double glazed as standard and has two top-hung windows and a single three-quarter glazed door as standard, all with handy detachable Georgian glazing bars, making it easy to paint and clean your doors & windows. 

This octagonal summerhouse is constructed from premium quality, kiln-dried, Northern European pine (tongue & groove, 28mm timber) a 19mm tongue & groove timber floor is included, and doors & windows are made from laminated timber to minimise warping.

Specifications Size
Wall thickness 28mm or 44mm
Roof height 2800mm - 3500mm
Eaves overhang 250mm
Base dimensions From 2.5m to 4m
Doors 1x Double door
Windows 2x Double casement windows

Custom Options

The Octagonal Summerhouse is a fully bespoke product. Choose between the following custom options to make a summerhouse that suits your garden.


Change the size in half metre increments between 2.5m to 4m.

Doors & Windows

Choose between a wide range of timber-framed, double-glazed doors and windows. Add timber glazing bars to create a traditional aesthetic.


Pick between five factory-painted colours for the doors, windows and walls, or have the building unpainted, ready for the colour of your choice.


The standard Bitumen felt shingles are available in a choice of five colours. Cedar and Cambridge Extreme shingles are also offered as an upgrade.


What if I don't see a garden building that suits my needs?

All our garden buildings can be modified to suit your needs. You can choose from a wide variety of door and window options and create your own size and layout. Alternatively, you can start from scratch with a made-to-measure design.

What are the benefits to insulation?

Insulation ensures that a garden building is warm in winter and cool in summer - offering the perfect environment for all-year-round use. We use high specification insulation similar to that used in modern loft conversions offering the maximum insulation property without affecting the interior appearance of your building. 

Design your own Summerhouse

Use the configurator design tool to create your dream Summerhouse!

Design tool

Example Designs

Below are some examples of alternative designs and configurations for the Octagonal Summerhouse.

Let's create your perfect garden summerhouse

Our team are on-hand to answer any questions and help design the garden summerhouse that's right for you.

Sharon Knight profile image

Sharon Knight

(1 year ago)

Excellent customer service. Delighted with the quality and build of our new garden office.

David Metcalfe profile image

David Metcalfe

(3 years ago)

Everyone we met and spoke to at Garden Affairs was helpful, patient and clear when we were working out what we wanted in the first place, and as thing... Read more

Tracey Hutchins profile image

Tracey Hutchins

(5 years ago)

Garden Affairs installed our log cabin in 2013 and it has been fault free ever since. However i managed to brake the window latch. so I rang them up t... Read more

4.8/5 Based on 109 reviews

What our customers say…

“ I am thrilled with the building. Your team were wonderful, so pleasant, efficient, polite and super professional. ”

Mrs Millin - Bristol

"We are really pleased with our summer house. Your team worked really hard, as it was a very hot day. Will recommend garden affairs to anyone needing a garden building. From our first… Read more

“ Our beautiful garden building is installed in our garden and it looks wonderful! Your team of fitters were extremely efficient and pleasant and we are delighted with the whole installation.… Read more

Mr & Mrs Bale - Bristol

Contact us about our Summerhouses

Please include as much information about the size and style of building you would like.

Alternatively - you can visit our showroom to see some of our garden buildings.

01225 774566
4.8/5 Based on 109 reviews

Send an enquiry

Optional file upload: You can upload up to three files, in JPG, PNG or PDF format, less than 2MB.

Optional product news and feedback

We may occasionally send email-updates with special offers or other product news. If you’d like to receive these updates please check the box below. You may also use this form to indicate you no longer wish to receive product news. Please note Garden Affairs WILL NOT share your details with any other company or organisation.

Send my enquiry