Large insulated garden room - choose how warm you need it to be!
Large insulated garden room - choose how warm you need it to be!
Large insulated garden room - choose how warm you need it to be!
Large insulated garden room - choose how warm you need it to be!
Large insulated garden room - choose how warm you need it to be!
Large insulated garden room - choose how warm you need it to be!
Large insulated garden room - choose how warm you need it to be!

Large insulated garden room – choose how warm you need it to be!

£9371.89
The Kingston log cabin is mainly one large space which is ideal for a large garden games room, an open plan office, extra room for your house, a meeting room or clubhouse. We can add extra windows and doors as well as a small box room in the rear corner…
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Garden Cabin Model: 3022-10535

  • Log Cabin Width: 10.5m
  • Log Cabin Depth: 3.5m

    • Building Canopy: 1.5m
    Building Wall Height: 2.4m
    Building Ridge Height: 2.5m
    4 x 710mm(w) x 1230mm(h) Window
    1 x 1565mm(w) x 1855mm(h) Double Door

    Large insulated garden room – choose how warm you need it to be!

    £9,371.89

    CHOOSE YOUR LOG CABIN WALL THICKNESS: Which one is best for me?

    Which wall thickness and cabin specification is best for you?

    Insulating the roof and floor of a single skin cabin dramatically improves their usability (warmer in the winter and cooler in the summer), but a Twin Skin is far superior. The table below shows the values achieved with Hortons log cabins (the lower the U value, the better it is).

    Cabin Specifications U-value of Building (W/m²K)
    28mm log cabin, no insulation 2.56
    45mm log cabin, no insulation 2.28
    28mm log cabin, with just roof insulation - no floor insulation 1.78
    45mm log cabin, with just roof insulation - no floor insulation 1.48
    45mm log cabin with roof and floor insulation 0.84
    70mm log cabin with roof and floor insulation 0.81
    Hortons Insulated Twin Skin Log Cabins
    35+35mm Twin Skin log cabin with standard fiberglass insulation kit 0.6
    35+35mm Twin Skin log cabin with standard Celotex insulation kit 0.35
    45+45mm Twin Skin log cabin with standard Celotex insulation kit (50mm wall cavity) 0.34
    45+45mm Twin Skin log cabin with non-habitable UK Building Regulations Celotex insulation kit (90mm wall cavity) 0.23
    45+45mm Twin Skin log cabin with UK Building Regulations Celotex insulation kit (105mm wall cavity) 0.21
    70+70mm Twin Skin log cabin with UK Building Regulations Celotex insulation kit (105mm wall cavity) 0.2

    lower the U value, the better it is) -

    For realistic comparison purposes, this is a table showing the U values required by UK Building Regulations for homes over

    the years, so you can see how the insulation of our cabins compare with houses built through the decades -

    Year 1965 1970 1980 1990 2000 2010 2016 2016 2022
    Whole Building U-value (W/m²K) 1.95 1.81 1.59 0.99 0.63 0.37 0.25 0.25 0.23

    We also offer upgrades for windows and doors, glazed areas, and cold spots. Upgrading these makes a big difference as well.

    • 35mm Single Skin
    • 45mm Single Skin
    • 60mm Single Skin
    • 70mm Single Skin
    • 35mm Twin Skin = 120mm Thick Walls
    • 45mm Twin Skin = 140mm Thick Walls
    • 60mm Twin Skin = 170mm Thick Walls
    • 70mm Twin Skin = 190mm Thick Walls
    Kingston 35mm 10.5 x 3.5m

    General options (popular options to choose for our log cabins)
    I want to modify the size/design of this building
    Design options
    Fixing Kit - includes enough nails and screws to build this cabin
    Extra partition walling (extra charges will apply if factory painting and/or installation is also required)
    Column corners - fully boxed in log ends
    Protect your cabin corners and upgrade your wind bracing
    Column corners - fully boxed in log ends
    Timber base kit
    Planning rules dictate that garden buildings are under 2.5m from ground level if within 2m of any boundary INCLUDING the base. Otherwise planning permission will be required.
    Weed and damp-proof membranes
    Roof & floor insulation kit for single skin cabin
    Floor Upgrade
    Veranda (the roof canopy measurement remains as listed in the building specifications)
    The handrail returns 0.7m in from either side as standard, regardless of the door position
    Roofline options
    EPDM rubber roofing, easy self-installation
    Guttering
    NB - if you choose water butts please bear in mind that you will also need an extra hard standing area - they cannot be installed onto grass or dirt
    Guttering
    Guttering
    Guttering
    Windows and doors
    Glazing upgrade (for standard windows and doors only)
    Upgrade standard side-hung windows to inward opening tilt & turn
    (Georgian bars are not a free option with these windows)
    3000 sq mm Trickle Vents (brown)
    Face fitting - require simple on site installation (air holes are pre-drilled)
    3000 sq mm Trickle Vents (brown)
    Not required
    Georgian bars (require fitting over standard glass panes)
    Upgrade to house quality 68mm glulam wood windows and doors
    Inward opening tilt & turn windows & external outward opening doors, all with multipoint keyed locks
    Upgrade your log cabin with uPVC windows and doors
    uPVC handle and hinge colour
    Paints and treatments (Factory painting or self-application options)
    Fire protection coating Class B - s1,d0 (ie better than UK Building regulations Class 0)
    Fire protection coating Class B - s1,d0 (ie better than UK Building regulations Class 0)
    Factory painting - timber is planed, not sanded before treatment is applied
    (NB you will need to order extra tins of paint if you intend to paint your ceiling/roof overhangs/canopies to match the walls)
    Colour choice for Teknos Aquatop factory applied treatment
    Please type your colour choice from the Teknos colour chart in the text box
    Click to open Teknos colour chart
    XTeknos Colour Chart
    Colour choice for Remmers treatment
    Please choose if you have opted for Remmers factory or self applied
    Click to open Remmers colour chart
    XRemmers Colour Chart
    Self application paints - Sadolin Classic / Superdec / Remmers - long lasting protection
    Sadolin Classic & Remmers = translucent, Superdec = semi-opaque - enough in tins for 2 coats to the external walls
    Colour choice for Sadolin product (self applied only)
    Please choose if you have opted for self applied Sadolin
    Click to open Sadolin colour chart
    XRemmers Colour Chart
    Danish Oil Internal Timber Treatment and sealer (self-application)
    Floor Varnish For Log Cabin (self application)
    Gold star base coat (self-application)
    Bundled discount paints deal! Big savings - save over 15%!
    Sale price - discounts available with our paints and timber treatments bundle
    Bundled discount paints deal! Big savings - save over 15%!
    Installation service for log cabins and timber buildings
    Cabin images on our website may also show optional extras (roof coverings, verandas etc). The paint colour images on our website may vary to the colour of treatment you purchase. You should try a sample pot first - paints & stains are non-returnable.
    All surfaces (internal and external) of your log cabin must be painted with an appropriate timber treatment or sealer
    Installation service for log cabins and timber buildings
    Installation service for log cabins and timber buildings
    Other items that you may want to enquire about
    Other items that you may want to enquire about
    Kingston 45mm 10.5 x 3.5m

    Kingston 60mm 10.5 x 3.5m

    Kingston 70mm 10.5 x 3.5m

    Kingston Twinskin 35 + 35mm 10.5 x 3.5m

    Kingston Twinskin 45 + 45mm 10.5 x 3.5m

    Kingston Twinskin 60 + 60mm 10.5 x 3.5m

    Kingston Twinskin 70 + 70mm 10.5 x 3.5m

    Large insulated garden room

    This 10.5m x 3.5m large insulated garden room has various options including -
    • Single skin
    • Single skin with an insulated roof and floor
    • Fully insulated Twin Skin (insulated walls, roof and floor). 
    However, there are also various levels of Twinskin insulation available for this cabin as well. We can even insulate it to fully comply with 2022 Building Regulations for a dwelling. This means it will easily comply with UK Building Regulations required for a garden annexe making sure everyone inside is warm and cosy in the winter with minimal heating. Not only that, but insulation works both ways - it will also be cool in the summer.

    Design the garden building you need

    Once you have decided on which wall thickness and specification that you want for your large insulated garden room. We offer a myriad of other options as well. This then allows you to specify the cabin to your own requirements and needs. All you need to do is start scrolling down the page and tick any of the options that you require and then "Add to cart" for your running total.

    Custom and bespoke garden room options 

    We offer the biggest range of building options but there is always room for more! If you can't see what you want or we don't quite offer the option that you need - then please contact us! We can custom build any of our garden rooms. Including this large insulated garden room, to any shape, design, size or specification...all you need to do is ask.

    Does this cabin comply with building regulations?

    There is a misconception that UK Buildings Regs will be needed of a building over 30sqm. This is not quite true - it is the internal size that counts and not the overall building size. This cabin is right on the cusp as it depends which wall thickness you opt for as to whether it is greater than 30sqm internally. If you opt for the fully insulated Twin skin, then it is less than 30sqm. But if you opt for a single skin wall then it is just over. However, this is not the be all and end all!... We can reduce the depth, width or both measurements such that is is less than 30 sqm if required. We have a solution for every occasion!

    We make all Hortons log cabins from slow grown spruce timber. Double glazed windows and doors are standard for all Hortons Log Cabins of wall thickness 35mm and above. 28mm Log cabins come with single glazing as standard ( Upgrade is available). We fit your glass for free before delivery, unlike some of our competitors. Hortons cabin doors come with special security hinges which are also adjustable. It is not possible to unscrew our log cabin doors from their frame to gain access - we use special security hinges which are also fully adjustable. We can add extra doors and windows to any Hortons Log Cabin, call us for details & quotes. Minimum purlin size for Hortons log cabins is 70x140mm and no greater than 600mm apart for a very strong roof

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