UK Manufacturers of High-Quality GRP Tanks & Pumping Stations
Designing and manufacturing durable fibreglass solutions since 1978.
Bespoke underground storage tanks, packaged pumping stations, kiosks and custom GRP fabrications manufactured in the UK for civil, industrial and commercial applications.
Built for Real-World Installation Conditions
At Castle Mouldings GRP Ltd, we manufacture robust GRP tanks and pumping stations designed for long service life, straightforward installation and dependable performance.
From standard underground storage tanks to fully bespoke packaged pumping stations, every system is manufactured to suit the requirements of the project — not forced into a one-size-fits-all solution.
With decades of practical manufacturing experience, we understand the demands of civil engineering, utilities, wastewater and construction environments
Why Choose Castle Mouldings?
Established Manufacturing Experience
Designing and manufacturing GRP products since 1978.
Bespoke Manufacturing
Custom sizes, pipework, access arrangements and internal fit-outs manufactured to your specification.
UK Manufactured
All products manufactured in the UK by our experienced GRP fabrication team.
Fast, Practical Support
Direct access to knowledgeable staff who understand the products and the installation process.
Built for Demanding Applications
Products designed for wastewater, surface water, chemical storage and industrial environments.
Quality Construction
Heavy-duty GRP construction with reinforced laminates, structural ribs and durable corrosion-resistant materials.
GRP Tanks & Storage Systems
We manufacture a wide range of GRP tanks for underground and above-ground applications, including:
Sewage tanks
Septic tanks
Pump chambers
Rainwater harvesting systems
Attenuation tanks
Chemical storage tanks
Water storage tanks
Bespoke process tanks
Available in diameters from 1000mm to 2500mm and capacities from 100 litres to 50,000 litres+, our tanks can be supplied in horizontal or vertical configurations with bespoke access, pipework and structural options.
Packaged Pumping Stations
Castle Mouldings manufactures packaged pumping stations for surface water and wastewater applications across commercial, industrial and residential projects.
Systems can be supplied complete with:
Internal pipework
Guide rail systems
Pumps and valves
Access covers
Control panels
Bespoke inlet and outlet arrangements
Each chamber is manufactured to suit the specific requirements of the installation, helping simplify installation on site and reduce modification work.
Engineered GRP Solutions for Civil & Industrial Projects
Our products are used across a wide range of sectors including:
Civil engineering
Construction
Utilities
Agriculture
Commercial developments
Industrial processing
Water and wastewater infrastructure
We work closely with contractors, engineers and merchants to deliver practical GRP solutions that are built for long-term reliability.
GRP Tank Manufacturers UK
Castle Mouldings GRP Ltd are UK manufacturers of fibreglass (GRP) tanks, pumping stations and custom composite products. We manufacture underground and above-ground GRP tanks for wastewater, sewage, rainwater, attenuation and industrial storage applications.
Our product range includes
GRP storage tanks
GRP pump chambers
Packaged pumping stations
Water tanks
Septic tanks
Cesspools
Attenuation tanks
Bespoke GRP fabrications
GRP kiosks and enclosures
All products are manufactured in the UK using high-quality composite materials designed for strength, corrosion resistance and long service life.
Need a Bespoke GRP Solution?
Whether you require a standard tank or a fully custom-built system, our team can help.
Speak to us about your project requirements today.