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Precision-built GRP tanks, made to last.

Established in 1973, we are a leading manufacturer of GRP water storage tanks, producing sectional, one-piece, two-piece, and bespoke tanks, as well as high-quality GRP housings.

A rectangular grey water storage tank with a flat lid and side access point
One Piece Tanks

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Two grey reusable block storage tanks stacked together
Two Piece Tanks

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Sectional GRP Tanks

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Open container showcasing a water storage unit with visible piping and equipment inside
Combination Units

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Green storage unit with an open door and a plain interior
Housings

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Ball valve with tank connector
Fittings

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Featured Products.

A selection of our most popular GRP water storage tanks, manufactured in Preston and built for reliable, long-lasting performance. View all products, click here.

About Our Manufacturing Capability.

We design, mould, insulate, deliver and install our own tanks. Very few of our competitors can say the same, and it is the reason a Decca tank arrives built to the specification we quoted rather than to someone else's.

Step One

British Manufacturing

Established in 1973, every Decca tank is moulded in the UK at our own works. We are a manufacturer, not a factor, so the specification, the tolerances and the lead time are ours to control rather than something we pass on from a third party.

Step Two

Precision Hot-Press Moulding

Our sectional tank panels are hot-press moulded for consistent wall thickness and a smooth finish on both sides. This precision allows the panels to be bolted together on site and helps the assembled tank retain its shape under load.

Step Three

One and Two Piece Tanks

Our one-piece tanks have no panel joints to seal or maintain. Where access allows, we supply a single moulding. For restricted access, our two-piece tanks can be transported in sections and assembled in the plant room. Both options are produced using the same tooling and method.

Step Four

Insulation and Protective Housings

We fit insulation in-house, with a choice of 18 mm, 25 mm or 50 mm thicknesses. We also mould GRP housings and walk-in enclosures to protect tanks installed outdoors, ensuring the tank and its enclosure are built to work together.

Step Five

Installation and Commissioning

Our own installation team manages every stage, from site survey through to commissioning. With Decca handling both manufacture and installation, you have clear responsibility throughout and a team equipped to resolve issues directly on site.

Why choose Decca?

For over 50 years, Decca Tanks has been delivering high-quality GRP water storage solutions to customers across the UK. Combining industry expertise, dependable products and a dedicated in-house team, we provide a complete service from design and manufacture through to installation, maintenance and refurbishment. Our focus on quality, compliance and customer support ensures every project is delivered with confidence.

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Team members posing with GRP water storage tanks in a workshop setting

Friendly
Experienced Staff

Fast Nationwide
Delivery

Dedicated
Installation Team

British Made
Products

12 Months
Full Warranty

Nationwide
Installation
Services.

Expert in-house team delivering installations across the UK and Ireland.

With nationwide delivery and installation coverage across the UK and Ireland, Decca Tanks supports projects of every size and complexity. Our experienced team works closely with customers, contractors and consultants to ensure products arrive on time, installations run smoothly, and every project is completed to the highest standards.

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Our Accreditations.

We have been manufacturing high quality products though out vast history, To expand upon and formalise this quality we work closely with the following accreditation agencies to make sure our products are at the forefront and the current standard applicable:

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