Made in Birmingham
Every product we sell is manufactured at our facility in Sparkhill, Birmingham. From raw material compounding to finished goods, we control the entire process in-house.
9
Extrusion Lines
24/7
Production
100%
UK Made
324+
Employees
Why UK Manufacturing Matters
This isn't just about patriotism—though we're proud to support British manufacturing and the 324+ jobs we provide in the West Midlands. It's about quality control, responsiveness, and reliability.
When you manufacture products yourself, you control the materials, the processes, and the standards. When you import, you're trusting someone else's quality systems, someone else's consistency, and someone else's priorities.
Since founding in 1993, we've progressively brought every stage of production in-house. The final step came in 2012 when we began compounding our own raw materials—making Kalsi one of the few truly vertically integrated plastic building product manufacturers in the UK.
Integrated Production Capabilities
What makes Kalsi different is how much of the manufacturing process we control. From powder to pallet, it's all under one roof.
In-House Compounding
Since 2012, we manufacture our own PVC compound from raw materials—complete control over formulations, quality, and cost. Our compounding facility processes thousands of tonnes annually, giving us independence from external compound suppliers.
Extrusion Lines
Our 9 state-of-the-art extrusion lines run 24/7, producing gutters, downpipes, fascia boards, soffits, cladding panels, and wall panelling. Each line is optimised for specific product profiles and runs continuously to meet demand across the UK.
ROMI Injection Moulding
Our fleet of ROMI injection moulding machines produce precision fittings, brackets, connectors, unions, and accessories. These Brazilian-engineered machines deliver exceptional accuracy and repeatability for complex geometries and tight tolerances.
Quality Laboratory
Our in-house testing laboratory performs impact testing, dimensional verification, colour matching, and material analysis at every production stage. From raw material intake to finished goods, nothing leaves without being verified.
Our Equipment
ROMI Injection Moulding Machines
Multi-tonnage fleet for fittings and accessories
From small rainwater brackets to large inspection chamber bases, our ROMI machines cover the full range. Precision servo-hydraulic systems ensure consistent shot weights and minimal material waste.
Twin-Screw Extrusion Lines
9 lines running 24/7 across all product ranges
Each line is configured for specific profiles—from small 21mm overflow pipe to 400mm wide fascia boards. Quick-change die systems allow efficient product changeovers.
High-Speed Compounding Plant
In-house since 2012, processing raw PVC resin
Our compounding facility blends PVC resin with stabilisers, pigments, and modifiers to our proprietary formulations. This vertical integration gives us total supply chain control.
Automated Packaging Lines
Bespoke packaging and labelling systems
Products are automatically measured, cut, printed, and packaged. Barcode tracking ensures full traceability from raw material batch to finished pallet.
ROMI Injection Moulding
Our fleet of ROMI machines produce the thousands of fittings, connectors, and accessories that complete our product systems.
Quality Control at Every Stage
Manufacturing in-house means quality control happens at every stage, not just at goods-in inspection when containers arrive from overseas.
- 1Material Testing
Raw materials tested before compounding begins
- 2Compound Verification
Every compound batch tested for consistency and performance
- 3In-Process Monitoring
Continuous dimensional and visual checks during production
- 4Finished Product Testing
Final verification against BS EN standards before dispatch
Capacity & Reliability
Our Birmingham facility runs 24/7 with multiple production lines providing built-in redundancy. If one machine requires maintenance, production continues on others. There's no single point of failure.
We don't have to wait for shipping containers or worry about port delays. When we say a product is available, it's available—usually from stock in our warehouse.
£54M
Group Turnover
30+
Years Manufacturing
Continuous Investment
As a family-owned business, we reinvest profits back into the company. Recent and ongoing investments include:
9 energy-efficient extrusion lines
ROMI injection moulding fleet
In-house compounding plant
Automated quality testing
Warehouse expansion
Solar panel installation
Visit Our Facility
Customers and specifiers are welcome to visit our Birmingham facility. See our manufacturing operation firsthand and understand the Kalsi difference.
Arrange a Visit