Bespoke GRP & Steel Enclosures
by Hill Grwp Ltd
We design, manufacture, and deliver fully bespoke GRP and steel enclosures for critical infrastructure, utilities, and industrial applications across the UK.
From compact kiosks to large multi-section plant rooms, every enclosure is engineered around your exact specification, including structure, base, access, ventilation, and internal equipment integration.
Whether you're delivering a substation, sprinkler pump room, or specialist housing, we provide a complete, coordinated solution designed to reduce site work, minimise risk, and improve programme certainty.
More Than an Enclosure – A Complete System
We don’t just supply enclosures, we deliver fully integrated solutions designed to simplify your project from start to finish.
Each unit is engineered as a complete package, incorporating structure, base, access, and service integration. This reduces on-site coordination, minimises installation time, and ensures consistent quality across every project.
Our approach allows contractors and project teams to deal with a single, coordinated supplier rather than managing multiple trades and interfaces.
What’s included:
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Integrated steel base systems
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Ventilation systems (natural or forced)
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Cable and pipe entry provisions
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Electrical integration and internal services (lighting, small power, containment, and connection points)
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Internal layout coordination around equipment
The result: a faster, safer, and more predictable installation on site.
Where elevated access is required, we design and supply bespoke external steel platforms and staircases to suit your enclosure and site conditions.
All access systems are engineered to provide safe, durable, and compliant access for operation and maintenance.
Each solution is tailored to your layout, ensuring correct positioning, usability, and integration with the enclosure.
Typical features include:
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Anti-slip flooring for safe access in all conditions
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Handrails and guardrails compliant with safety standards
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Custom stair configurations based on site constraints
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Hot-dip galvanised or C5 painted finishes
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Designed for long-term external use
By delivering access systems as part of the overall package, we eliminate the need for additional on-site fabrication and coordination.
Our enclosures can be supplied with fully engineered steel base systems, designed to support both the structure and the internal equipment.
By integrating the base into the overall design, we reduce the need for complex on-site steelwork and ensure all service interfaces are pre-planned and accurately positioned.
Bases are tailored to suit your foundation design and project requirements, whether installed onto concrete plinths, slabs, or other structural supports.
Key features:
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Hot-dip galvanised or C5 painted finishes
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Integrated cable entry and pipework penetrations
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Lifting points for safe handling and installation
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Open or enclosed base configurations
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Designed to align with your civils and foundation layout
This approach improves installation efficiency and reduces risk during the construction phase.
Ventilation Designed Around Your Equipment
Effective ventilation is critical to the performance and longevity of housed equipment.
We design ventilation systems as part of the complete enclosure solution, ensuring that airflow, heat dissipation, and environmental protection are all properly considered.
Each system is tailored to suit the equipment inside the enclosure and the operating conditions of the site.
Options include:
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Natural ventilation using high and low-level louvres
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Forced ventilation systems with mechanical extraction
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Weatherproof louvre systems with vermin protection
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Layouts designed to maintain required IP ratings
Our experience across infrastructure projects ensures reliable and compliant ventilation solutions.
Fully Bespoke Sizes and Configurations
Every enclosure we deliver is built to suit your specific project requirements.
We do not work from standard sizes, each unit is designed around your equipment, access requirements, and site constraints.
From compact kiosks to large multi-section plant rooms, we ensure that layout, access, and functionality are considered from the outset.
We can accommodate:
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Small single-unit enclosures
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Multi-bay and multi-room configurations
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Modular designs for restricted access sites
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Split units for difficult delivery conditions
This flexibility allows us to support a wide range of applications across multiple sectors.
Finishes Built for Long-Term Performance
All enclosures are manufactured using materials and finishes selected for durability, performance, and minimal maintenance.
We understand that many installations operate in harsh or exposed environments, so long-term protection is built into every design.
Available finishes include:
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Specialist textured GRP finish
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GRP gel coat for gloss finishes in a range of colours
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Hot-dip galvanised or C5 painted steel components
This ensures your enclosure continues to perform throughout its service life with minimal upkeep.
From Design to Installation
We support your project at every stage, from initial concept through to delivery and installation.
Our team works closely with contractors, consultants, and project managers to ensure that each enclosure is fully coordinated before it reaches site.
This reduces delays, avoids clashes, and ensures a smooth installation process.
Our process includes:
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Design development and technical support
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General arrangement (GA) drawings and approvals
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Manufacture and factory assembly
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Delivery as complete units or split sections
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Installation support or full installation where required
By managing the process end-to-end, we help reduce risk and improve overall project efficiency.
Frequently Asked Questions (FAQs)
What type of foundations are required for your enclosures?
Enclosures can be installed onto concrete plinths, slabs, or other prepared foundations. We provide base designs and loading information to ensure compatibility with your chosen foundation solution.
Are access platforms and staircases designed as part of the project?
Yes. All external access systems are bespoke and designed alongside the enclosure to suit site conditions, equipment layout, and safe maintenance access requirements.
How is ventilation determined for each enclosure?
Ventilation is designed based on the equipment inside the enclosure and its heat output. We assess airflow requirements and provide suitable natural or mechanical solutions.
What finishes are available for different environments?
We offer textured or gloss GRP finishes, as well as galvanised or C5 painted steel options, depending on environmental exposure, durability requirements, and project specifications.
Can you accommodate specific service entry requirements?
Yes. Cable entries, pipe penetrations, and service interfaces are all incorporated into the design to align with your equipment and site layout.
