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50 years experience
Manufactured in Great Britain
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Pressure Treated Diplomat Grandmaster Pavilion

Free Anti-Rot Treatment - Guaranteed for 15 years*
  • Extra STRONG
  • EXTRA TALL
  • UK Manufactured By Us
  • Multiple Design Options
  • Assembly time is 4x faster than a log cabin!
  • Fully Pressure Treated*
  • Free UK Delivery*
  • Shatter Resistant Styrene Glazing
  • Upgrade to Glass Double Glazing

From £108.42 / month

I Choose your treatment

  • Standard Dip Treatment
  • FREE PRESSURE TREATMENT
    WORTH
In stock
Mortice lock and lockable windows
Extra tall inside
Stronger and taller double doors
16mm cladding upgrade
15 year anti rot guarantee
Fully opening windows

Disclaimer : Painted buildings are for illustration purposes only. All buildings are in their standard or pressure treated colour upon delivery. A distance of 1m must be kept between the boundary and your building to allow access for annual treatment and to comply with the anti-rot guarantee*.

Grandmaster Summerhouse

Looking for a bigger, more luxurious garden summerhouse that’s practically a home away from home? Then look no further than the Pressure Treated Diplomat Grandmaster Pavilion. There’s plenty of space for you and your guests to enjoy the warm UK summer from the comfort of your garden. Wide spacious windows will allow plenty of sunlight to enter the building, and the extra tall inner structure will make you feel like you’re right at home. With lots of customisable options, your new summerhouse will be perfectly suited for your outdoor space.

High quality materials

Made with quality in mind, we only select the best materials.

15 Year anti rot guarantee*

Our pressure treated timber prevents rot and protection from the elements.

Longer lasting

Strong and durable design for a building that lasts.

Thicker and doubled up framing

Our doubled up framing gives your building extra strength and rigidity .

11mm and 16mm Shiplap options available

Upgrade to 16mm for an even stronger building.

Extra high ridge and eaves height

Designed to give you maximum headroom.

Pavilion Included

A 5ft deep spacious pavilion with decking included.

Double summerhouse half glazed doors

For a more traditional look to your building.

Pressure treated as standard for a longer lasting building

Our pressure treated timber gives you increased weather protection and is easier to maintain.

Traditional style roof with an overhang

Giving you a place to relax in view of your garden.

15ft and 11ft gable sizes available

Get the most from your building with our larger sizes.

Single or double glazing options

For all year round use, upgrade to double glazing.

Full boarded 11mm tongue and groove roof as standard

Stronger and longer lasting roof with heavy duty full length purlins.

3 tongue and groove floor thicknesses available

Upgrade to a thicker heavy duty floor for those larger items.

Multi purpose interior

Ideal for all kinds of uses.

Our signature mineral felt is included as standard

For basic weather protection, our mineral felt is included.

All weather protection. Upgrade to shingles or rubber roof

For extra longevity of your building upgrade to a rubber roof.

Pre-assembled panels that fit through your door

Made from modular panels reducing the need for heavy lifting.

Fixings and Instructions

All fixings and stage by stage instructions included

Select Size
Select Measurements
Metric
Imperial
Overall Dimensions
Overall Width
Value
Overall Depth
Value
Width Internal
Value
Depth Internal
Value
Eaves & Ridge
Eaves Height Inc. Floor
Value
Eaves Height Excl. Floor
Value
Ridge Height Inc. Floor
Value
Ridge Height Excl. Floor
Value
Eaves Height Internal
Value
Ridge Height Internal
Value
Features
Windows
Value
Shed Type
Value
Project Timber Range
Value
Roof Style
Value
Fixtures & Fittings
Value
Cladding Style
Value
Locking System
Value
Interchangeable Windows
Value
Basecoat Treatment
Value
Pre-Assembled Side Panels
Value
Select options
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  • Size
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  • Wall Thickness
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  • Window Fixings
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  • Glazing
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  • Floor
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  • Roof Cover
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  • Paint Colour
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  • Colour Trim
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