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Garden room SIPs kits - Trade customers only

We service businesses across England in the garden build sector, providing them with bespoke kits which are all manufactured in our New Forest workshop, utilising specialist SIP materials. Our in-house design and manufacturing capabilities allow us to deliver a high-quality product to support your business and client needs – including the option of structural calculations on larger projects where applicable.


Our design experts will produce a set of SIPs construction drawings to assist you and/or your site team with the SIPs installation.


We only sell garden kits to trade customers and we have a high demand with a limited amount of accounts that we accept at any point. This is reviewed quarterly whenever additional spaces become available. We keep our accounts to a set number to guarantee the level of service we are renowned for as well as lead times. If you would like to register your interest in becoming one of the Garden Room accounts we supply please email:

What is included for our SIPs accounts:

  • Rapid quoting for bespoke jobs - quotes for bespoke kits will be returned within 24 hours.

  • Large suite of standard off-the-shelf design options

  • Lead time - for our core accounts we guarantee a 4-6 week lead time. 4 weeks if no structural engineering is required, 6 weeks if there is.

  • Access to a private online store to order off-the-shelf kits

  • Project Management - you will have a dedicated account and project manager

  • Marketing material - we strive to provide as environmentally friendly product as possible, we also manufacture all of our panels in the New Forest. We have lots of marketing information you can use to highlight this to your end clients so they can take pride in the materials their new garden room is being made from. 

Delivery or collection is available on all services.

For self-builders looking to build your own SIPs kit please see our helpful information section. If you are looking for a turn key garden room we have a great list of amazing garden room companies who share our values for quality and sustainability, please email with your address and we will gladly put you in touch.

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What’s included?

  • Manufacture of SIP panels for walls, roof and floors (if requested)

  • SIPs design and structural engineer calculations (if requested)

  • Cutting, rebating, processing, and packaging of SIPs & associated parts

  • Sole and wall plates, timber fixing splines and joining timbers

  • Glulam or steel beams if specified by our structural engineer

  • Window and door apertures pre-cut and structurally framed with timber

  • Weather-resistant breather membrane to wrap your walls and roof

  • Specialist SIPs screw fixings, adhesives, and sealants

  • Professional haulage and delivery to site or curbside

  • Comprehensive SIPs kit construction pack for easy assembly

What do you need to provide? 

  • Prepare your foundations – see below for more info

  • Windows and doors

  • EPDM roof or similar

  • Gutters and downpipes

  • External and internal finish (cladding, plasterboard etc.)

  • Electrics and water (if required)

SIPs vs Timber Frame or Masonry

  • SIPs can be erected up to 60% faster than with traditional construction methods

  • Shorter time-on-site means you can complete more projects per year

  • Unlike traditional construction methods which rely on good weather, SIPs are erected regardless of the conditions

  • Our SIPs kits are manufactured within our controlled workshop environment which provides guarantees of quality and tolerances

  • Our EPS insulation is 98% air and just 2% plastic, it’s 100% recyclable and provides an incredible U-value of 0.31 (120mm panel)

  • A SIPs lightweight shell reduces the need for machinery and concrete production on-site (lowering your CO2 emission)

Design process

Design Stage (from deposit paid)
Approval Required
Stage 1 - elevations and floorplan*
Week 1 - 2
For comment (within 2 days)
Stage 2 – elevations and floor plan sign-off
Week 2 - 3
Adobe E-sign (within 2 days)
Stage 3 - production drawings for manufacturing
Week 3 - 4

*  showing the location panel timbers within the SIPs floor (this will inform ground workers where to install screws or pads)

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Our SIPs kit construction packs make assembly and installation both efficient and quick. We will provide you will all the details required to build your own SIPs structure, and you will have the option to approve any plans ahead of manufacturing in our workshop.


Design Changes

One round of design changes for free prior to Stage 2. Further changes will be charged at £200 ex VAT per change, including minor and major.

After stage 2 is completed and your drawings have been signed-off and approved, we are unable to make design changes as this will already be in production. The client is to pay in full for the aborted project, and/or a new order will need to be placed, subject to the lead times at that point.


We recommend one of three types of foundation to be in place ahead of the SIPs structure installation, simply let us know which type you are using and we will send you a detailed drawing of the floor section for you to share with the groundworks company.  Please note: our SIPs kits do not include foundations.

Want a SIPs floor?

Ground screws are galvanised screws that are wound into the ground with precision to create a strong and level platform for your garden room, office or leisure building. Environmentally, ground screws offer a huge reduction of emitted carbon compared to a traditional concrete base. We recommend the Great British Ground Screw Company as our preferred supplier.

Pads offer another innovative solution, especially where the rocky ground makes digging really difficult. Environmentally, the pads can also be a great way to reduce your carbon impact. That’s why we’ve teamed up with a preferred supplier that produces its pads from 100% recycled plastic – we recommend Jackpad.

Without a SIPs floor?

Concrete slabs can also be used as the base for your SIPs structure, you will just need to ensure you build a small masonry dwarf wall out around the perimeter of the base for your SIPs to be built upon. Take a look at our 3D SIPs detailing guide to see this build-up.

  • Can I use SIP's for the Ground Floor?
    This is certainly common in smaller garden room type buildings in SIPs and technically possible in a full-scale house build also. SIP floors should always have a minimum of 50mm airflow gap below. The ground beneath SIP floor buildings should be graded with a permeable membrane and/or Type 1 MOT/gravel cover or alike. We also recommend treating the underside face of SIP floor panels with a bituminous primer prior to assembly.
  • Can Services be installed between the SIP walls?
    No. The SIP panel is a thermally-efficient airtight product that works best without services running through. We recommend the use of a counter batten to create a service void for electrical wiring and fixtures to be installed. If required on external walls, they can be surface mounted and then boarded over. Internal walls are timber stud and services follow a standard installation. Posi-Joists allow easy installation between floors.
  • How much faster can I build with SIP's?
    SIP homes go up much faster than traditionally framed buildings. The nature of the panel system enables a fast-track building process which helps to reduce construction time. A typical two-storey 200m2 house takes approximately 10 days to fabricate in the factory and 15 days to erect on site.

Panel Options

Panel Options
Garden Office (-30m2)
Garden Annex (+30m2)
Wall Panel Weight (3m)
Roof Panel Weight (3m)
Roof Panel Weight (2.4m)
Wall Panel Weight (2.4m)
Walls SIP panel thickness
Roof SIP panel thickness
Floors U-Value (thermal resistance)
Walls U-Value (thermal resistance)
0.18 *with membranes
Roof U-Value (thermal resistance)
0.11 *with membranes
Floors EPS insulation thickness
Walls EPS insulation thickness
Roof EPS insulation thickness
OSB skins thickness
Max panel width
Max panel length
1.2m or 3m
1.2m or 3m
Floor SIP panel thickness
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