Opening Hours:
Mon-Thu: 7.30am – 4.30pm
Friday: 7.30am – 4pm
Exciting new website coming soon!
Plastics, Doors & More
Trusted by the Trade
Backed by decades of industry experience through our parent company, Capital Garage Doors (est. 1978), and our specialist sister brand Sparesmaster, Capital Building Plastics is your dedicated trade supplier of high-quality building plastics, doors, windows, and essential consumables. With a well-established distribution network, on-site warehousing, and strong trade relationships, we supply installers, builders, and developers across the South East of England with the products they need — when they need them.
Welcome to Capital Building Plastics – Trade Specialists in Quality Building Products
Whether you’re sourcing durable UPVC trims, fascias, soffits or looking for composite doors, aluminium windows, roof lanterns or trade tools, we provide dependable, expert service and an ever-growing product range designed to meet the demands of modern construction and renovation.
Building Plastics
High-Quality UPVC Building Plastics for the Trade
We stock a wide selection of low-maintenance, weather-resistant UPVC building plastics including trims, fascias, soffits, cladding, gutters and downpipes – perfect for any installation or renovation project. Designed for longevity and ease of fit, our building plastics are sourced from trusted UK manufacturers and available in a variety of finishes and colours to suit all property styles.
UPVC Trims
Flexible and durable UPVC trims ideal for finishing internal and external edges, window reveals, and joints. Available in a range of profiles, sizes and colours for a professional finish.
Fascias
Robust UPVC fascia boards that protect roof edges while enhancing kerb appeal. Choose from a variety of styles, finishes, and widths for any application.
Soffits
Ventilated and solid soffit boards that promote roof airflow and protect rafters. Lightweight, easy to install, and low maintenance.
Cladding
Decorative and protective UPVC external cladding ideal for both domestic and commercial buildings. Enhance insulation and aesthetics with a modern, clean look.
Rainwater
A full range of rainwater systems including guttering, downpipes, brackets and bends – all engineered for performance and built to last.
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Doors & Windows
Doors and Windows Built for Performance and Style
From secure composite and steel front doors to energy-efficient aluminium windows and all types of garage doors, we supply a wide range of high-performance products ideal for new builds and refurbishments. Designed with the trade in mind, our doors and windows offer fast installation, superior thermal efficiency, and long-term reliability.
Composite, Steel and Aluminium Doors
Secure, stylish entrance doors with excellent insulation and customisable finishes. Choose from contemporary or traditional styles in composite, steel, or aluminium.
All Types of Garage Doors
A full range of garage doors from leading brands, available in various finishes and materials to suit any property, all with reliable security, smooth operation, and professional-grade performance.
UPVC & Aluminium Windows
Sleek, energy-efficient windows in a variety of opening types and styles. Made to last and engineered for thermal and acoustic performance.
Consumables, Tools & Accessories
Trade Essentials to Get the Job Done
We stock the consumables, fixings, tools and accessories professional installers rely on every day — from sealants and adhesives to screws, silicones, hand tools and PPE. All competitively priced and in stock for fast trade supply.
Consumables
Silicones, sealants, adhesives, cleaning agents and everything else needed for finishing and fitting.
Tools
A curated range of reliable tools for professional fitters and builders — from basic hand tools to specialist gear
Accessories
From ventilation grills to fixings and fitting aids, we supply the extras that keep projects moving.
Your dedicated trade supplier of high-quality building plastics, doors, windows, and essential consumables.
© 2025 Capital Building Plastics All Rights Reserved.
Contact
Tel: 01293 843 434
Eml: sales@capitalbuildingplastics.co.uk
Genesis House
Priestley Way
Crawley
RH10 9PR
West Sussex