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Trade & DIY supply across South Wales

Windows, Doors & Home Extensions South Wales

A clear starting point for made to measure uPVC windows, uPVC doors, aluminium bifold doors, composite doors and LEKA Xi modular home extensions from Building Plastics Wales. Choose your project route, send your sizes and get a fast, competitive quote.

Made to measureManufactured to your sizes and specification.
Competitive pricesGood value for trade and DIY customers.
Fast serviceQuick quotations with practical product advice.
Fast deliveryHelping keep South Wales projects moving.
Choose your project

Four project routes, one helpful supplier

Whether you need windows for a full property, a wide-opening bifold door, a replacement front door or a warmer modular extension, start with the section that matches your job.

Made to measure uPVC windows and doors

uPVC Windows & Doors

For homeowners, installers, builders and DIY customers looking for uPVC products supplied to size.

  • Casement, flush sash and tilt & turn windows.
  • Residential, French, patio and uPVC bifold doors.
  • Colour, glazing, hardware, cills and trim options.
Aluminium bifold doors for extensions and kitchens

Aluminium Bifold Doors

Wide-opening aluminium bifold doors for extensions, kitchens, garden rooms and renovation projects.

  • Flexible panel configurations and folding directions.
  • Slim aluminium profiles for larger glazed areas.
  • Colour, glazing, threshold, handle and security options.
LEKA Xi modular home extension

LEKA Xi Home Extensions

Modular base and wall systems for warmer conservatories and home extension spaces.

  • Installed in days, not weeks on many projects.
  • Insulated GRP base, wall and roof options.
  • Designed to reduce heavy excavation and mess.
Designer composite door on a modern home

Composite Doors

Secure, thermally efficient composite doors with traditional, contemporary and designer styles.

  • Made to measure entrance doors.
  • Choice of style, colour, glazing and hardware.
  • Low-maintenance finish with weather protection.
What we can help with

Products for homes, extensions, renovations and trade jobs

Use this page to route customers quickly to the most relevant product information before they request a quote.

uPVC Casement Windows

A practical, popular choice with flexible opening options and made to measure sizing.

Residential & French Doors

Made to measure entrance, back and French doors for a wide range of property styles.

Aluminium Bifold Doors

Slim aluminium profiles, wide openings and flexible configurations for open-plan living.

LEKA Xi Extensions

Modular base and wall systems for conservatory upgrades and new living spaces.

uPVC Patio & Bifold Doors

Sliding and folding options to connect indoor and outdoor spaces.

Composite Doors

Traditional and contemporary entrance doors with colour, glass and hardware choices.

Colours & Finishes

Choose frame colours, glazing, hardware, thresholds and finishing trims.

Related Products

Ask about trims, sealants, fixings, roofline, guttering and cladding for the same job.

Fast quote checklist

Send the right details and we can price the job faster

For made to measure products, a few clear details help the team quote the correct specification first time.

Sizes and quantities

Overall width and height, number of items required and whether supply only is needed.

Product style

Window type, door type, bifold configuration, extension size, opening style or roof style where required.

Finish and specification

Frame colour, door colour, glazing choice, handles, threshold, cills, trims, roof and wall finish.

Delivery location

Town or postcode in South Wales, plus access notes that may affect delivery or installation.

South Wales supply area

Window, door and extension product supply across South Wales

Building Plastics Wales supplies trade and DIY customers across South Wales, including the following areas.

BlackwoodNewportCardiffCaerphillyPontypoolCwmbranMerthyr TydfilBridgendSwanseaSouth Wales Valleys

Ready for a fast quote?

Call the windows and doors quote line on 01495 533631, or email your measurements, photos and preferred specification to info@buildingplastics.co.uk.

Head Office: Unit 1-3, Block E, Penmaen Industrial Estate, Pontllanfraith, NP12 2DQ. Blackwood Shop 01495 221630 | Newport Shop 01633 893291 | Online Store 0333 050 0585. Product images, colours, specifications and lead times should be confirmed at quotation stage before ordering.