Welcome to JSI Timber Frame Limited

JSI Timber Frame Ltd based in Pembrokeshire, South Wales is run by Nathen Houston, a time served carpenter with more than 20 years experience within Pembrokeshire, Carmarthenshire, Ceredigion and South Wales.


The last 10 years, Nathen has spent erecting timber frames locally and further a field, from your 2 up 2 down timber frames, to new schools and flats for both private and commercial customers. JSI Timber Frame is the natural progression from frame erecting to manufacture and erecting. With a 3350sq ft workshop and computer aided design, JSI Timber Frame Ltd can produce a quality product delivered and installed to a high quality.

About us

At JSI Timber Frames, we employ computer aided design to engineer roof trusses and SpaceJoist open web joists to exacting standards of quality and high value. Recent investment in our Pembrokeshire manufacturing plant has grown floor space to 5500 sq ft to accommodate higher roof truss and SpaceJoist production capacity.

Additionally, with over 25 years of experience in carpentry on site, JSI provide a skilled installation service and advice where required

Why choose JSI Timber Frame?

    Why choose JSI Timber Frame?
  • We have procedures in place, to ensure that from ordering, to completion of your timber frame, runs efficiently.
  • Qualified, competent, friendly staff with knowledge of our product, coupled with more than 10 years timber frame erecting experience.
  • We take pride in our product and service.

Mission Statement
We ensure that we will supply a quality product manufactured & installed accurately and efficiently.

Ian Michael

I&R Properties

We feel that we need to express our gratitude for the project for which you have carried out at Broadchalet View, Broadhaven. We are extremely impressed with the quality of work and service.

We feel that we are extremely fortunate that you have not only produced and erected the frame but that you also liased with the Pembrokeshire National Parks in relation to the additional works that you carried out, ie, guttering work, handrails and spindles, internal partitions, dry-lining and the organization and steady flow of the project with the periphery contractors.

Please feel free to pass my details onto any perspective customers where I will only be too happy to share my experiences with. Hopefully, as discussed, there are future projects in the pipeline and if you can retain the competitive rates as on this project I am sure that we will have a long term future relationship.

C.A.T.G RegisteredTruss Mark Registeredtrussed Rafter Association