Principality Plastics Ltd


We are a specialist plastic building supplies merchant for both trade and DIY customers. We have been trading for over 26 years, and in that time have built a reputation for affordable but high quality building products that improve the inside and outside of your homes.

Our focus as a plastic building supplies merchant is on supplying low maintenance products that look great and stand up to the rigors of everyday use.

We sell our building materials through our 3 stores, which are located in Cardiff, Gloucester, and Swansea, as well as online. We’re delivering nationwide from Monday to Saturday. No matter where you are in the UK or Ireland we’ve got you covered.


We offer high quality plastics and hardware for use inside and outside the home. We stock essentials such as bathroom wall & ceiling panelsguttering systems, fascias, soffits, durasid exterior wall cladding as well as specialist luxury items like Composite Decking, Balustrades and Fencing as well as integral window blinds.

The products available here are easy to install for professional fitters, builders and amateurs alike. If you’re performing DIY take a look at our easy to follow installation instructions for a wide range of wall and ceiling panels.

Our bathroom, kitchen, wall and ceiling panels are easy to fit, quickly establishing a protective barrier against moisture.


As a plastic building supplier we have long standing partnerships with outstanding brands like Swish and Deeplas. We trust the quality of their products and the expertise behind them, and offer the advantages of quality products at competitive prices, this because we often source directly from the manufacturers themseleves.

We have over 27 years experience in the plastic building supply industry and our customers are in the forefront our mind. Find out about the history of the business on our about us page.

Benefit from FREE delivery on orders over £180 (inc. VAT) and regular special offers for more great savings. Orders are dispatched quickly, usually on the same day when placed before 11pm. And don’t forget to talk to one of our team members to receive our online prices in store.