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Annexe Style Bespoke

Regular price Price From: £49,995.00
Regular price Sale price Price From: £49,995.00
Sale Sold out

Why Rubicon

  • Multi-Award Winning
  • Trading Standards Approved
  • 20 Year Guarantees
  • Built to Housing Standards
  • Made To Measure
  • Full Turn-Key Solution
  • Fully Customisable
  • All Year Round Use

Full Specification

A bespoke garden Granny Annexe from Rubicon is truly a safe and comfortable home from home. It’s built to Housing Standards with exceptional levels of insulation, ensuring your loved ones will not only be super cosy, but the costs of heating will be minimised, even in the most extreme of winters.

Looking after an elderly relative these days is an expensive business with care home fees reaching extortionate levels. With residential care now costing anything from £40-£60,000 a year and the inherent health risks within communities of elderly residents (Covid risks etc), it makes sense to keep your loved ones close.

They can enjoy independent living, safe in the knowledge that a caring relative is just across the lawn in case of need. It makes sense economically too, with the cost of installing a luxury granny annexe in your garden often being recovered within 12-18 months of installation when compared to external residential accommodation.

For elderly relatives, selling the family home can be a traumatic and emotional experience. But when their home becomes too big to manage and with health deteriorating, liquidating this asset will free up substantial funds, enabling not only the purchase of the granny annexe, but also savings which can be banked for future security.

Furthermore, a bespke garden granny annexe is well known to add value to your property, so instead of wasting huge sums on residential care homes, your investment is not wasted as you retain the asset value.

Even a large 2 or 3 bedroom Granny Annexe of up to 20m x 6.5m can often be built in your garden without Planning permission, incorporating lounge/diner, double bedrooms, toilet, shower room and kitchen. PRICED FROM £49,995 (8m x 4m) everything can be made to your requirements with this model, but standard specifications include (model shown with cost optional front and side canopies):


  • Comfortable All-Year Round Living
  • Full Turn-Key Build & Installation (incl external services at extra cost)
  • True Zero Maintenance Wood Fibre Composite Exterior Cladding as standard
  • Natural Wood, or Coloured Render Cladding as cost options
  • Front or Side Canopies (incl Downlights) as cost options
  • French or Sliding UPVC Doors as standard
  • Fully Plasterboarded & Skimmed Interior as standard
  • Choice of Laminate Floors or Carpets included
  • Super Warm Insulated & Certified U-Values
  • Concrete Pile/Pad Base Included
  • 20yr Treated Timber Frame Guarantee
  • 20yr Composite Roof Guarantee
  • Fully Breathable & Ventilated Structure to avoid mould/damp
  • Fully Underboarded for Vermin Control
  • 28mm Triple Glazed UPVC Doors/Windows as cost option (Double Glazed as standard)
  • Comprehensive Electrical Package inc 2Kw Wall Heaters
  • High Specification Toilet/Shower and Kitchen
  • Prices Include Fitting & VAT
  • Built to Housing Standards it’s Like a House, Not a Caravan!


Fully transportable, prefabricated dismountable structure. Bespoke garden annexe, Made to Measure sizes available. Full Turn-Key Package. Top of the range specifications. UPVC French or Sliding Doors as standard. Aluminium Bi-Folds or Sliding Doors as a cost option. Fully insulated for year-round comfort with the equivalent of 300mm of fibreglass in the Roof and 200mm in the Walls and Floor.

Offered with optional front and/or side canopy. The top section incorporates a UPVC soffit and fascia board with Composite Cladding as standard. Cedar or Render cladding is a cost option. Final cost depending on customer specifications.


Made to Measure - built to fit your available space.  


Deduct 350mm from width and depth to establish approximate interior floor space.


This building can have normal housing ceiling heights under current Regulations.


Mounted on galvanised 6ton steel legs. Pre-installed fully adjustable pad base to suit ground conditions included.


Fully Insulated & Ventilated Cavity Walls comprising: Overall thickness 170mm (approx); 19mm Cedar (cost option), Wood Fibre Composite (included) or Self-Coloured Render Cladding (cost option); Ventilated Cavity; Du-Pont Tyvek (or similar) Breather Membrane; 11mm OSB3 Exterior Grade Sheathing for rigidity; 96mm x 47mm (approx) treated C16 or C24 structural grade timber frames; standard 100mm (approx 200mm fibreglass equivalent) Foiled Foam primary insulation layer; Vapour Control Membrane; 12.5mm Plasterboard and skim to interior walls; 3” White Skirting around base of interior walls.


Our standard supply is a Zero Maintenance Wood Composite cladding material with a manufacturers 10 year guarantee offering true ZERO maintenance, unlike timber cladding (see FAQs for explanation).  Self-Coloured Render or Cedar cladding is offered as a cost option if preferred.


Fully Insulated Floors comprising: (minimum) 125mm tanalised treated C24 Floor Joists; Double Joist Perimeter; Adjustable 6 Ton rated Steel Galvanised Legs; 100mm (approx) Composite Foil Foam Insulation, under-boarded with metal skins for rodent protection; Heavy Duty Damp Control Visqueen Membrane; 22mm Industrial Grade Moisture Resistant Floor Boards. Composite Laminated floor finish or carpets


Fully Insulated Roof comprising: 20 year guaranteed Composite Roof Panel; 150mm (approx 300mm fibreglass equivalent) Composite Metal skinned Roof Panel with 12.5mm Plasterboard and skim.


Black plastic gutters and downspouts connected to Water Butt with integral tap. Black and Grey UPVC Fascias 


Secured by Design (SBD) specifications for extra security; 28mm Double Glazed (Triple Glazing as cost Option) twin or single doors (Sliding Doors extra cost option) in Grey outside/white inside (other standard RAL colours no cost option, special colours at cost) UPVC (aluminium available as a cost option); Insurance Rated Multipoint security locking system; Pilkington's Reflective 28mm 'K' Glass as standard. 


28mm Double Glazed (Triple Glazed cost Option) in Grey outside/white inside (other standard colours no cost option, special colours at cost) UPVC (aluminium available as a cost option). Pilkington's 'K' 28mm Reflective Glass as standard; SBD Insurance standard Security Locks.


All assembled with stainless steel, galvanized or green coated exterior fixings (screwed together, NOT nailed).


Minimum 6 Gang RCD protected Consumer Unit; LED Ceiling Spotlights to suit size of room; minimum 10 Double Switched Sockets; interior Light Switches; all fascias in brushed or chromed steel; Exterior Water-Proof Socket; 2 Exterior Wall Lights and canopy downlights (where canopy specified); 2KW Electric Convector Heaters to main living areas with Timer and Thermostat; external Connector Box for incoming SWA electrical cable - connection of Granny Annexe to incoming services by others or priced upon application


All Structural Floor, Roof and Wall Timbers pressure preservative treated for minimum 30 year life expectancy


Your fully transportable Granny Annexe Building will arrive with our trained installers ready for full site assembly by us on our own base pads (excludes armoured electrical mains supply cables and connection of incoming services, priced extra if required due to variable site requirements). 


We primarily operate across the Chester, Cheshire, Wrexham, Wirral, Deeside, Flintshire, Denbighshire, North Wales, Manchester, Lancashire, Liverpool, Warrington, Crewe, Nantwich and Shropshire areas, but welcome enquiries within around 70 miles of our Deeside base.

Purchase Options

FULLY ASSEMBLED OPTION - Your Garden Building will arrive at your chosen address with our trained installers. We will provide specialist pile foundations and will fully assemble your building, including internal plaster skim and electrical wiring to our RCD electrical consumer unit. Please note, we will not provide any interior painting nor an external electrical supply from your house to your new Garden Building unless contracted to do so separately. Click HERE for a list of areas which incur extra delivery charges.

Base Recommendations


In order to ensure that your RUBICON™Garden Building is installed in the correct manner it is important that the following Requirements are understood:

1) Ground conditions must be suitable for the installation of concrete pile foundations or cast in-situ concrete pads unless a suitable existing concrete slab is already in place. We can advise on this during our FREE site survey

2) Our quoted price for your RUBICON™Garden Room assumes that the area where the Building is to be fitted is reasonably flat. Although the feet of the building are adjustable by up to 18" there are limits which can incur additional costs. We will identify if this is the case during our FREE Site Survey.

3) From a Planning Permission perspective, most of our buildings can be fitted right up against your neighbouring walls or fences. However, we normally require a minimum of 600mm (2') clearance to three sides (unless you have permission from your neighbour for us to access via their land) and usually 2m to the front elevation of the building to facilitate access for assembly, and to allow us to take the necessary Health and Safety precautions on behalf of our fitting teams.

4) Some components of our buildings are very large and heavy, such as the panel assemblies which can be up to 10' x 4' and 200mm thick weighing in excess of 60 kilos. Consequently, it is important that access to site is unencumbered and free of obstruction. Please note: Access to site via an internal route through an existing building is not usually practical or permissible - check with us first.

5) Vehicular access to the front of the property at which the Garden Room is to be installed needs to be suitable for a large delivery vehicle, with adequate space for unloading large quantities of material. Talk to us if you think this may be a problem - we can usually find a solution...!

6) The area where your Garden Room is to be assembled should not be overgrown by hedges, trees, vegitation or other material obstructions or debris such that would impede our installation team, cause them potential physical harm (hawthorn hedges etc), or undue delays in having to clear the site and surrounding area prior to starting work.

7) You will need to ensure that there are no overhead or underground services such as electricity, water, telephone, gas or drainage which will impair our ability to install your Garden Room on the proposed site. Again, we can help to confirm this during our FREE Site Survey visit.

8) We will require access to a suitable 240v 50Hz mains electricity supply and mains running water for our staff during normal working hours, typically from 8:00am to 6:00pm each working day.

Delivery Info

We now only supply/install within approx. 60-70 mile radius of our Deeside base (CH5). Delivery is FREE within this area.

Specifically, we NO LONGER supply to the following areas due to the distances and logistics involved:

  • All areas outside of the UK mainland
  • London
  • Greater London
  • South & SE beyond London
  • South beyond Stoke on Trent
  • Birmingham/Coventry
  • North beyond Preston and Manchester
  • Hastings, Dover etc
  • Lincolnshire
  • Norfolk Broads
  • Wiltshire & SW
  • Devon
  • Cornwall
  • Northumberland
  • Scotland & Isles
  • The Borders beyond Shrewsbury
  • Mid-Wales beyond Welshpool
  • South Wales
  • Northern Ireland

On average your Rubicon Garden Room will be completed within a 10-15 day period, depending on complexity.

The Small Print

Whilst our Garden Room specifications are very comprehensive there are a couple of items NOT included in our standard range prices for the reasons stated below. However, these services can be priced for on an individual basis and included at extra cost if the Customer so wishes:

1) Supply, routing, trenching and connection of armoured cabling required to facilitate the electrical connections between any existing 240v supply (from your House for example) and the Garden Building's Consumer Unit.

Reason: As every installation varies, it is impossible for us to provide a standard price for this service but can quote following survey.

2) Supply, routing, trenching and connection of any Water, Drainage, Gas, Telephone, Internet or other such Utilities.

Reason: As every installation varies, it is impossible for us to provide a standard price for this service but can quote following survey.

3) Clearing of ground and/or removal of debris and any other physical ground or overhead obstacles, other than light surface soil and vegetation, needed to enable the efficient and timely installation of your Garden Room

Reason: As every installation varies, it is impossible for us to provide a standard price for this service.

4) Painting and decorating of interior walls, ceilings and woodwork.

Reason: It takes plaster skim about 7 days to dry (may be longer in colder weather) and for us to return to site to carry-out this work would cost more than either doing it yourself, or employing a local firm to do it for you. This helps us to keep the costs of our standard products down.

5) Carpet, Tile, Laminate or other types of floor coverings.

Reason: Our standard fit is an industrial grade P5 water resistant rated 22mm thick interlocking floor system. This is a perfect subsurface for any type of floor covering, including ceramic tiles, laminates or carpets. As the types and colours of floor coverings vary so much, it is impossible for us to provide a standard price, as you will most likely want to make a personalised choice. It will be more cost effective for you to contract a local supplier for this service, although we will do it for you if you wish.

Please also click the ‘Base Recommendations’ tab for information on Delivery and Access requirements.

  • Materials, Labour & VAT inc.

  • Concrete & Steel Pile Foundations

  • Premium Honeycomb Insulation

  • Professional Installation

  • Fully Treated Timber Frame

  • Fully Ventilated Structure

  • Comprehensive Electrical Package

  • Metal Composite or EPDM Rubber Roof

  • Fully Plastered & Skimmed Interiors

  • Choice of Composite, Cedar or Natural Wood

  • UPVC or Aluminium Double Glazed Door/Window Sets

  • Kitchens, Toilets & Shower Rooms Available

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  • Inside north wales business leaders awards 2018 shortlisted.
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  • Daily post business awards achievement wales 2013.