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Structure Details

garden rooms, garden offices, insulated garden rooms, fully insulated garden rooms, built to last garden rooms


Even the smallest of our Garden Buildings weighs in excess of 3 Tons - they are substantial structures, not insulated sheds, and are built to ensure that your Garden Office or Garden Room will last a lifetime in excess of 30 years. They are miniature houses, with proper 'breathing walls', ventilated roofs and damp proofing membranes, just like those you would find in a modern timber framed house in Scotland for example. Fully insulated for year round occupation, and fitted with our unique zero maintenance external cladding (timber and render options also available), they are designed to be eco-friendly and cost effective to run.

Consequently, they take around 8-10 days to build, not the 1-2 days some of our competitors quote (erecting a shed doesn't take as long as a properly built structure such as ours)

Please Note: We DO NOT USE SIPs. We build our garden rooms and offices using Traditional methods. Whilst SIPs do offer slightly improved insulation U-Values, they are sealed boxes which don’t breathe. While minimizing air leaks improves energy-efficiency, in ultra-tight SIP built garden rooms, proper mechanical ventilation is required to create a safe, comfortable, and healthy environment for building occupants. Understanding the proper sealing and ventilation requirements for SIP structures is imperative to create an efficient and comfortable building. House builders are subject to Building Regs and embody this. Garden Room builders do not..!

Timber Frames

Timber frame buildings are one of the most popular methods of construction worldwide. Over 70% of people in the developed world live in timber framed houses, whilst in the USA and Canada it accounts for 90% of single and double storey buildings.  In Scotland, timber frame is the most popular method of construction due to its suitability for cold climates and its inherent high energy efficiency. 

A RUBICON™ Garden Room or Garden Office is constructed from treated timbers to BS5589:1998 giving an expected life span in excess of 30 years.  The Wall frames for our Insulated Garden Buildings are built in factory controlled conditions, from a minimum of 96mm x 47mm C24 & C16 structural grade regulated timber, whilst our roof and floor uses the superior strength C24 grade of timber. This ensures the quality and precision of each component, whilst reducing on-site build time due to the "kit" format of assembly.

External Sheathing

To prevent the structural panels from deforming under wind-load and potentially collapsing (known as racking strength), the exterior walls of a RUBICON™ Garden Room or Garden Office are covered (sheathed) in structural grade sheets of Oriented Strand Board (OSB3) a high-quality exterior-rated, wood composite board or plywood. The sheathing also helps to reduce wind penetration through the external walls. This is the same construction method as used by well known Timber Frame House-builders from Scandinavian and Germany such as Scandia-Hus and Huf-Haus.

Under Boarding

Likewise, all our buildings are boarded underneath with 9mm Ply or OSB3 to protect against vermin attack. If not protected in this way, vermin can gain access to the insulating foam panels under the base.

Breather Membrane

To protect the interior timber structure from penetrating rain water, and to allow the building to breathe, a waterproof membrane to BS4016, is applied to the outside face of our Garden Rooms. This waterproof, but vapour permeable layer protects the internal timbers from any water ingress, such as wind driven rain, that may find its way across the cavity between the exterior cladding and the internal timber frame.  At the same time it allows any moisture vapour trapped in the panels to escape - hence allowing the structure of RUBICON™ Garden Room or Garden Office to "breathe" naturally.

Vapour Control Barrier

To prevent condensation occurring within the internal wall panels (called Interstitial condensation) a vapour control layer (VCL) to BS5250 is required between the insulation and the internal plasterboard. If a VCL is not fitted then moisture, in the form of vapour, can pass through the plasterboard, through the insulation, and it can then condense on the cold inside face of the outer sheathing, causing mould growth and timber rot.  A RUBICON™ Garden Room or Garden Office comes complete with an internal vapour control layer (membrane) to fully meet NHBC and TRADA specifications.


The gold standard specifications of our premium range Garden Rooms and Garden Offices  offer up to 6" (150mm) of PIR foil-foam insulation (where stated) equivalent to up to 12" (300mm) of fibreglass wool. This is installed as both primary and secondary layers. The primary layer of 50-100mm (depending on model) sits between the timber frames, whilst the secondary layer of 25-50mm sits across the frames preventing cold-bridging from the warm side of the room to the cold outside. If you are not using the room all year-round then, as an option, we can reduce the insulation and save you cost.

Ventilated Roof

Our roof construction follows TRADA and NHBC guidelines for the ventilation of moisture laden air through the roof structure by providing cross ventilation from front to rear of the building - just the same as eaves vents on your house. Our designs provide Eaves overhangs with a ventilation grille (giving a 25mm continuous gap along two opposite sides), together with a minimum 50mm clear void for airflow inside the roof cavities.


FIRESTONE Rubber Roofing

Our flat roof models have a Firestone EPDM one-piece Rubber covering to BS 747:2000 or BS EN 13707:2004 and a drainage fall of 1:80 from the front elevation to the rear gutters.

Flat Ceilings

On all our Garden Rooms and Garden Offices, apart from the Cabin Style models, we fit flat ceilings - there is no slope inside, our slope is on the top of the roof. This provides additional usable headroom inside the building, and gives a more 'house like' feel. Another advantage with this construction method is that we can fit ceiling LED downlights, unlike some competitor models which use composite metal roofing panels - these can only fit track lights or wall mounted lights due to the risks of overheating and resultant fire.

Windows and Doors

We can offer UPVC, Timber and Aluminium to suit most budgets. White UPVC is the cheapest followed by coloured UPVC, then timber with aluminium the most expensive. As standard our doors and windows are UPVC with grey exteriors and white interiors. They all have multi-point locking systems so security is not an issue, and they are fitted with double glazed, argon filled 'K' glass as standard with warm edge spacers, thereby meeting the latest Building Regulations.

Industrial Flooring

Until relatively recently, standard flooring grade chipboard was the automatic choice for most timber frame buildings. Chipboard is quite durable if it stays dry but if it remains wet or damp for long periods it can swell and lose strength. Moisture resistant chipboard (with better quality glue) is often  specified in houses for areas such as bathrooms and kitchens.  

In a RUBICON™ Garden Room or Garden Office an industrial grade, 22mm moisture resistant T&G composite board is used. This provides good protection during and after construction, even if the boards become wet, whilst also providing an excellent base for tiling, carpet or laminate.

Exterior Cladding

Our standard fit is now Wood Fibre Composite but we offer Western Red Cedar or treated European Redwood (details HERE) as a no-cost option. Cedar and Composite cladding materials are used extensively in North America, Scandinavia, and Australia, often in extreme weather conditions. The building is manufactured with a ventilated cavity to stop any driving rain or water vapour penetrating the building. This has the same venting effect as the cavity wall in a house between the internal block-work and exterior brick layer.  

A RUBICON™ Garden Room or Garden Office with vertical cladding offers a fully ventilated cavity wall, ensuring full compliance with NHBC and TRADA professional codes of practice.

Interior Finish

All our buildings are dry-lined and plaster skimmed to provide a 'house like' interior feel. All our ceilings are flat inside so you don't lose headroom even though the roof is sloping on the top. Skirtings and architraves (where applicable) are provided to complete the quality feel.

Electrical Package

All buildings come with a comprehensive package of electrical equipment as standard, with lights and sockets in a choice of chromed, satin or white finish. Sufficient spotlights in the ceiling, plenty of double sockets, twin exterior lights, 2.4Kw electric heater with timer and thermostat, exterior waterproof socket for your lawn-mower and a mains RCD consumer unit all being standard fittings.

Interior Options

If you need interior dividing walls and quality oak doors, or even a shower-room with toilet then we can do it, including all ground works for water and drainage.


What our Customers Say

"Please convey my thanks to everyone and we were very touched at your kindness. You were all an absolute pleasure to have around and it felt very quiet without you!! We are absolutely thrilled with the Garden Room and have now painted the walls and ceiling and the laminate wood flooring and skirting boards are being fitted tomorrow. Once the skirting boards are painted we can move in the furniture and will be like pigs in muck!!! Many, many thanks once again, we are absolutely delighted with our Garden Room. After you left Heather sat on the decking with a glass of wine, this is the life! Take care and you all have a safe journey tomorrow. Thank you once again."

Andrew and Heather - Ruthin, N.Wales

“We did an awful lot of research and found Rubicon online. We drove across to Deeside to have a look at their showroom, and all the different examples on display. We liked managing director John Lyon a lot and his approach gave us confidence to start the process. All in all, it took a couple of months from deciding that we would have a Garden Office until the team arrived on site as they were very busy and we needed to book a delivery slot well in advance. Then they were here for about three weeks for the installation which included drainage and water supplies for a toilet and mini kitchen. The team were lovely guys – no nonsense and very diligent, polite, hard-working people. Dave likes to cook a bit – mainly cakes and pastries – so he baked things for them, which always helps to keep the team happy..! We now have a beautiful extra Garden Office room, which Dave uses when he’s working at home. He has a 30 second walk to work in the morning, and it means we are no longer in the way of each other. I believe that the building is also a thing of great beauty and I would absolutely recommend Rubicon to anyone considering something similar.”

David and Rachel - Manchester

"We trawled through the internet and Rubicon sounded like the best bet for what we were after. We made an appointment and went down to the showroom on Deeside. There we met Managing Director John, spent time looking at the different examples on show and examining the products, and then had a good chat about what we needed. We never felt rushed or pressurised, and had time to think about what we wanted - his whole manner makes him such a good person to deal with. We felt that we were getting a good product. What Rubicon offered was perfect for what we wanted and, once we started the process with them, the work was done in just two to three weeks. The team turned up every day at the time John said they would, and were polite and very easy to get along with. Having them here working in the garden was no trouble at all and I would recommend Rubicon without a doubt - in fact some of the neighbours have already been round to see it and ask where we got it. I can say hand on heart that John and his the team from Rubicon were the nicest people we have ever had work for us."

Dennis and Val - Stockport

"Dear John, Thank you very much, all very professional from your company throughout the construction and installation. I cannot find anything, but if there is somewhere where I can place a review or recommendation on your web site I will be pleased to do so. Please just send me a link. As and when the garden, now under snow is complete, I will forward some photos, probably June the way the weather is. I have received a letter from Flintshire County Council asking for me to comment on your services. Just to let you know that I am returning it, highly recommending your company. All the very best to you and your company in the future. We are really pleased with our Garden Room and I would not hesitate in recommending you to any future customers. Just ask them to call me."

Mick and Barbara - Burnley

“I love my new garden room. Got to say this was one of the most enjoyable experiences of dealing with a company ive had for a long time. Finish is fab inside and out, its made such a difference, we use it all the time. Jake our son, won’t come out of there. Can’t thank John and his team enough of a great product at a great price….Thank you, etc etc.!”

Gill and Ben Henderson, Warrington

"We wanted to get a Garden Room that David could use as a separate office that was peaceful and quiet when he’s working from home. We liked what we saw at Rubicon’s showroom in Deeside straight away, and got on very well with the MD John Lyon – he immediately gave us the confidence that he would deliver what he promised, and he did. We took one of their standard Garden Offices and adapted it so that it would work for us, and nothing we suggested was a problem for Rubicon – they were really good to work with. They kept me posted all the time about what was going on, what stage they were at and who would be coming and what they would be doing the next day. They tidied up after themselves too, and really minimised any inconvenience. What was very important to me as well was that we had my elderly father staying with us at the time, he was 85, and they were so very respectful to him. Everyone from the young apprentice to the seasoned builders treated him brilliantly and talked to him about what they were doing every day while I was out at work. The Garden Office is lovely and warm as it’s fully heated, and so can be used all year round. I would most definitely recommend Rubicon Garden Rooms to anyone."

David and Kate - Frodsham

“Rubicon’s extension been fantastic, and it has really changed Ray’s life. It’s very warm and fully insulated, light and comfortable - it is easy to look after. We can get Ray in and out of bed and into his wheelchair much more easily, and it means that he has somewhere to go that’s his, for some quiet time. He loves sitting by the big window watching the birds and wildlife, or enjoying the views of the garden. The extension is very well made and went up quickly, and has changed our life. It means Ray has somewhere to sit, and we haven’t lost our lounge. When our three grandchildren come round, they love to go into his room and see him. I can’t thank Rubicon enough for the help their team have given us, they have been brilliant."

Ray and Josie - Mancot

“We had been looking for something to fill a big space at the bottom of our garden for some time and then Pat heard about a local Garden Room company through our friends at the golf club who had had one built for them. We went to have a look and were very impressed so contacted Rubicon for more details. I must admit that when we saw the showroom model we were so impressed that all logic went out of the window - we didn’t even consider the alternatives until after we had paid our deposit - not our normal way of doing things. But we needn’t have worried. I researched the internet and the price we had been quoted for what we had fitted represented excellent value for money. We could not be happier with our choice now and would like to thank Bill and Alan for doing such a great job - always smiling and nothing was too much trouble. We would highly recommend Rubicon Garden Rooms and are are actively passing on the message amongst family and friends. Good luck for the future”

Cliff and Pat Lovell, Llandudno

"Hi John, Just got back from a couple of days in London. I can confirm that invoice has arrived and has been paid. Many thanks for ALL your work. At our little garden party last Sunday all commented on the new Garden Studio - and one chap has examined it thoroughly (!!) and will contact you to arrange one for himself. All like the grey!! Hope you have a lovely Christmas, and hope we can keep in touch. Best wishes. PS Jan will send you photos with some plants in front!"

Stephen and Jan - Hawarden, Nr Chester

“This company may not be the biggest but they are surely the best. I drove my wife mad in my research for a building to run our business from after out-growing the spare bedroom I wanted something which could provide a distinct break between home live and work. To be frank there were not many companies within our locality, most of those i found were based down south and I wanted someone more local that I could put a face to ( and shout at if i needed!). A friend of mine had had some building work done recently and recommended I talk to them to see what they could do as he thought they also made garden offices. Best decision I ever made was to contact Rubicon the whole team are so professional and the product is fantastic. No complaints whatsoever apart from it did take a bit longer than I thought it would as they were very busy at the time. But the end result has been a triumph, exactly what I wanted at a competitive price and when i look at what i have saved by not renting an office it’s a no brainer…”

Phil Grayson, Northwich

"I saw Rubicon Garden Rooms online and wanted to find something that was nearby so that I could go and see what they were doing and talk to people face-to-face about it. I went along to the showroom in Deeside and I was very impressed with what I saw, and with the Managing Director John Lyon. I nearly ordered a conservatory but changed my mind at the last minute when I realised that one of these Garden Rooms would be nicer and much more use to me all year round. It was quite an investment so I took some time to think about it but eventually I decided to go for it and treat myself, as I was still working but also had my pension coming in. I went back for another chat and told them what I wanted and they just came and did it. They knocked down the old lean-to and started again and created this lovely room, leading on from my main living area. Rubicon Garden Rooms were just lovely to work with and did everything I asked. From the very beginning they gave me good advice and guidance and made it a really easy process throughout – I’d definitely recommend them to anybody else looking to extend their home simply and quickly."

Beryl - Talacre, N.Wales

"One of our disabled tenants required access to ground floor facilities, including a bedroom and bathroom. This need was urgent, so instead of a traditional build, which would be highly disruptive to the tenant, we approached Rubicon Garden Rooms who provided a high quality Garden Room attached to the property, which has the potential to be reused elsewhere in the future. We were delighted that Rubicon were able to quickly provide this essential modification to the property that met the council's rigorous standards for such work."

Cllr Helen Brown - Flintshire County Council

“We did quite a bit of research into companies that make them and chose Rubicon Garden Room as we thought a synthetic material would last better and we liked their range. Here in the Garden Room I can switch the laptop on and keep up with conference calls at any time, which is important as we have manufacturers in America and the Far East. Having this Rubicon room just gives us a bit extra space and lets me get away from the house when I need to. Their team were great, they cleared up after themselves every day and I couldn’t fault them at all. We’re very happy with what we’ve got, it’s a perfect, self-contained space with everything we need. and it makes a huge difference to my work-life balance.”

Nick and Paula - Halifax

"We had an office on a local business park, but being able to move into our own premises here has been a wise business move. We've got the perfect, self-contained space with everything we need. We can now open our French doors and have lunch on the patio in a lovely established garden, which is something most people would love. We did a lot of research and found that the prices were all very similar,” said Julian. “But what we liked about Rubicon was the fact that we could go and see their factory in Deeside and the examples they had on show. We also visited a few completed buildings and talked to the owners and we heard nothing but positive feedback so we decided to go with them. Most of the structure is prefabricated at Rubicon’s base and then they come and slot it together on site. They were great to work with – they were all very competent and everything I asked of John and his team, they delivered."

Julian and Kerry - Wirral

"Hi John, Hope you have enjoyed your weekend! Building is brilliant, we are extremely pleased with it, plaster is drying out nicely. I have sent over the last payment to your bank this evening.....On behalf of Clare & myself, I would like to thank You and the build team (Buster,Lee,Martin, Liam, Kurt & Dad), and not forgetting the window guys... for all your hard work and excellent eye to detail on our lovely pool room! Will let you know when everything is completed and you are welcome to visit with your Marketing PR person if you need any further photo’s. Look forward to meeting up for a cuppa soon :)"

Colin and Clare - Leicester

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