Triangle House, West Sussex. - CDI
Triangle House, West Sussex.

It isn’t very often that you get involved in something truly off the wall and out there. With this new timber framed “triangle” shaped house in West Sussex we certainly had that.

Due to the shape of the site, the proximity of a railway line to the rear of the property, and not to mention the main sewer line that runs through the site the new house was designed to be triangular, not just in plan but also the walls and roof. Luckily the person taking on this stunning project was up to the task.

Done as a true self-build the timber frame was built in just a few weeks meaning that we were able to supply the Lewis Deck only 6 weeks from starting on site.

In total we supplied 120m2 of deck, which were then laid on the top 2 floors of the house, along with both of our flanking and rubber resilient strips to maximise the acoustic performance through the two floor zones.

With no straight-walled rooms and a dramatic sloping zinc roof that touches the ground on one side, their eye-catching home was featured on the Channel Four programme Grand Designs where presenter Kevin McCloud described it as one of the trickiest plots ever seen on the show and the resulting home as a ‘giant 3D geometrical puzzle.’


The house, as it is very close to a railway line, needed to be as acoustically sound as possible. The Lewis Deck with screed allowed us to do this as well as stopping any vibration. It also meant we didn't have to compromise on the quality of the build.


As this was such a “one off” project it has been featured in a number of media publications. As well as Channel 4’s Grand Designs the links below are to The Times and Great British Life articles.

Billingshurst | Grand Designs

The Grand Designs Triangle house in Billingshurst, Sussex (

How we built our amazing triangle house in West Sussex (

Meet the Sussex couple who built a triangular house | Great British Life


Ask CDI a Question

  • Q

    What are the Lewis Deck sheet sizes?


    Q: What sheet sizes are held in stock for delivery within a few days after order? A: We stock 2500mm and 1300mm sheets.  These are all 630mm wide and 16mm deep.  Deliveries are made via the pallet network directly to site.  The smaller sheets are aimed at small bathroom renovation projects and can be supplied in small numbers via TNT. 2.5* and 1.3m sheets allow for the 100mm overlap to occur over a joist, with joist centres being either 300mm, 400mm, 600mm, 800mm*, 1200mm and 2400mm*. (*2.5m sheet only) For larger projects we are able to produce bespoke sheet sizes if required, please get in contact to discuss other options for sheet sizes.

  • Q

    Why don't my Lewis sheets interlock like they do in the video?


    Q: Why don't my sheets interlock like they do in the video? A: The sheets have two sides (one printed, one plain), the dovetails on either side are different widths, it is then necessary to alternate the sheets print up and then print down.


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Triangle House, West Sussex. - CDI