Custom GRP Mouldings

Sui Generis: unique, one of a kind

We manufacture a widely diverse range of GRP moulded products for a range of architecture, automotive and industrial customer requirements, but also regularly work on unusual projects that don't fit within these categories.

As our latin name "Sui Generis' suggests, we also manufacture unique, bespoke products to customers specification.

As leading manufacturers of GRP mouldings, we can provide you with high quality fibreglass products and a complete service that transforms your designs into the polished, final product.

Your custom specification, our bespoke GRP solution

Whether you have standard parts you'd like us to manufacture on a regular basis, or you need to commission a single item, you can rely on us to create the right GRP moulded product for your requirement.

Recent custom-made products

The examples here are just some of our recent custom made GRP fibreglass moulded projects.

From large TV scenics and props, to storage, we can mould it

We have created giant sized soup bowl props and scenic components for television production studio sets, outer shell moulded giant burger shapes for mobile catering vans, to acid-resistant battery storage boxes.

We can create almost any shape, size and colour in a range of finishes. Your project can benefit from the protection, longevity, low maintenance costs and unique shape of GRP fibreglass.

Ask for a FREE quote today

Call 01206 798 798 now to discuss your unique requirement with our technical team, we can manufacture the right solution for you.

Sui Generis International provide bespoke FRP components for first-in-the-UK railway footbridge solution on behalf of Network Rail

Network Rail have led a new innovative project to develop and deliver the UK’s first fully modular, FRP (Fibre Reinforced Polymer) footbridge. Officially opened in January 2023.

Turning traditional methods on their head, the vision for the FLOW bridge was modernised by using a modular system made from FRP composites, a polymer matrix (typically a resin) reinforced with fibres made of glass, carbon, or aramid.

Following design and development, Sui Generis manufactured and supplied the main bridge structure, including the modules that form the bridge walkways, the stair inlays, and sidings...

Read Case Study

FRP modules manufactured off-site.

Modules manufactured off-site

The modularised system also allows for most of the materials to be manufactured off-site, reducing the pressure on installation teams and disruption of passenger services and track closures.

Rail bridge installation in half the time.

Installation in half the time

Installation of the footbridge can be done in half the amount of time it would take for a traditional in-situ produced steel structure.

FRP Fibre Reinforced Polymer is lighter and highly cost effective.

Lighter and highly cost effective

Composites are up to 70% lighter than steel and have a high strength-to-weight ratio. This considerably reduces transportation and installation costs, making FRP an ideal solution for a rail footbridge.

More custom made GRP fibreglass moulded projects...

GRP Concierge desk & halo

Custom moulded reception desk

We were delighted when the contractor assigned with the task of fitting out Barclays Bank branch approached us to produce GRP outer shells for a concierge desk and halos…

Read Case Study

GRP building facade signage

GRP building façade signage

For this large format sign for exterior use GRP fibreglass was perfect. Long lasting, maintenance free, weather risistant solution, and looks great when installed on London residential area.

GRP battery storage boxes

GRP acid-resistant storage boxes

Sui Generis specialise in making custom GRP storage and equipment boxes to suit specific customer requirements.

View GRP Containers, GRP Battery Boxes, Storage and Equipment Boxes

Bespoke moulded planter inserts.

Bespoke moulded planter inserts.

Custom made, tough composite moulded liners or troughs that are positioned into a container or existing planter to make them watertight. Ideal for raised beds, large garden landscape displays.

View Custom Planter Inserts

5 good reasons to choose Sui Generis Fibreglass bespoke mouldings...

  • Economy – cost-effective
  • Quality – weather and impact resistant
  • Design – we can realise your uniqiue specification
  • Longevity – indefinite lifespan
  • Service – 90% repeat custom rate

GRP fibreglass bespoke mouldings – a Sui Generis guide

Glass-reinforced plastic (GRP) is a versatile material that can be moulded into almost any shape. Because it's corrosion-resistant, impact-resistant and hard-wearing, it's the ideal material for a wide variety of applications – industrial, architectural and commercial.

The chemical resistance of fiberglass makes it great for manufacturing storage tanks and tank lids, while its hard-wearing nature makes it a long-lasting cover for pits and machinery.

Read more.

Its light weight and high strength make it handy for auto parts and it can be finished to resemble traditional materials like stone or ceramic for architectural purposes.

Increasingly, it is being used to create modern, colourful furniture both for offices and outdoor areas.

Sui Generis can mould almost any shape from standard or custom designs and give it the colour and finish you want.

What kinds of structure have you moulded in GRP?

We've moulded everything from a regular supply of cab roofs for Luton Transports to a bespoke architectural moulding for a Victorian building. These are just a few examples of the structures we can create from GRP moulds:

  • Replica chimneys, funnels stone cornicing and turrets
  • Cab roofs, spoilers and cab fittings
  • Tank roofs and covers
  • Storage tanks
  • Enclosures, cabinets and standalone housing
  • Desks and fascias
  • Benches, chairs and garden planters.

Why use fibreglass mouldings?

Because they offer strength durability and resistance – which means they're safer, more secure and will last longer, saving you money over time.

When you order a fibreglass moulded storage tank or tank roof, it will be chemical-resistant, corrosion-resistant and weather-resistant – and can even be customised to suit its contents.

Likewise, the colour and vibrance of our moulded seating and furniture won't fade, crack or perish – making every piece a low-maintenance investment purchase you'll use for years.

With all these great benefits, no wonder more and more structures being moulded out of GRP fibreglass.

Are there other benefits to moulded fibreglass?

There are many. These are just some of the properties of GRP moulds:

  • Corrosion Proof
  • Chemical resistant
  • Leak free
  • Impact resistant
  • Indefinite lifespan

Do your fibreglass mouldings conform to regulations?

Yes. All our fibreglass moulded products are manufactured to strict quality standards and use only high quality materials.

Because they need to be ready to house chemicals, oil and other liquids, our storage tanks comply with current Pollution Prevention Guidelines (PPG2) and SEPA (Scottish Environment Protection Agency) regulations.

For more details, take a look at the individual pages dedicated to our fibreglass products, or give us a call – we'll give you all the information you need.

Can you give me advice about fibreglass mouldings?

Of course. We'd be delighted to help you solve your problems with fibreglass moulding.

Just call us on 01206 798 798 today and we'll send one of our site inspectors to give you a free quote and all the information you need to get started.


  • "Sui Generis fabricated the seating beautifully...They provided us with an in-depth overview to the products on offer and case studies to show how it would work in situ. They understood what was needed and refined the seating to match our requirements. The fibreglass seating was delivered on promised production schedule and the colours were just as described with a perfect finish."

    R Peckham, Sui Generis fibreglass bespoke seating manufacture

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  • "Communication was good throughout the design and pre-installation stages."

    M Gaedke, Sui Generis GRP Wave Canopy

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  • "Your quotation, as always, is very competitive (but it's your professionalism and superb build quality that sells it to us!)"

    P Hawtin, Sui Generis bespoke Red Cabinet

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  • "On a personal note, I think suigeneris has some of the nicest and most polite staff I have ever dealt with in all my years of business.

    You have all been absolutely lovely and a credit to your organisation."

    D Moy, Sui Generis bespoke GRP Bund

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ISO 14001
Our accreditationsArmed Forces Silver Covenant


Sui Generis: The market leader in fibreglass mouldings

Sui Generis quality guaranteeQuality guarantee

Our highly competitive work gives you the best quality results every time – every one of our operatives is highly skilled, well trained and takes exceptional pride in what they do. With Sui Generis, you can rely on effective, long-lasting work.

About Sui Generis.

Sui Generis fully CompliantCompliance and accreditations

Entrust your project to Sui Generis, a company with sector wide recognition and approval for being compliant with industry standards. Accredited under schemes such as Link Up, Achilles and Constructionline your work is in more than capable hands.

ISO 9001:2008 and accreditations.

Sui Generis health & safety promiseOur health & safety promise

We take your safety seriously, and that of all our people, whether we're at a small factory or a nuclear plant. We always adhere to stringent health and safety procedures at every stage – and comply with your own Heath and Safety policies.

Health & Safety.

Sui Generis satisfaction assuredSatisfaction Assured

Every job we undertake is completed with your satisfaction in mind. We work hard to be the best at every task we tackle – and that's why over 90% of our customers return to us time after time.

Customer Testimonials