In modern industrial and commercial buildings, the point where mechanical and electrical services penetrate the roof is frequently overlooked during early design. Yet roof penetrations are one of the biggest contributors to leaks, thermal loss, and compliance failures across the UK construction sector. Improvised timber housings, site-cut openings, and hastily applied weatherproofing leave long-term performance to chance. 

Choosing the right GRP (Glass Reinforced Plastic) enclosure is essential for protecting valuable equipment, maintaining site safety, and ensuring long-term reliability in demanding industrial environments. While many GRP manufacturers produce good-quality composite enclosures, very few are able to integrate fully engineered steel doors into their GRP buildings. 

We’re excited to share our latest pre-packaged pump room, designed with both functionality and safety in mind. This particular unit features a specially attached access lid, complete with a high-quality gas strut to hold it securely open.

Across this multi-site project area, our client required a series of reliable and compliant rooftop entry system to safely house critical equipment. Every location was different - varying roof layouts, equipment footprints, and operational needs - which made TopBox the ideal solution.  TopBox is our fully customisable GRP roof entry system, developed to give facilities teams the flexibility, safety, and durability they need… without disruption to ongoing operations. 

From design → manufacture → logistics, our team handled every detail to ensure safe delivery and smooth installation on site. - Heavy-duty industrial equipment - Harsh outdoor environments - Compliance and long-term access needs

Our TopBox GRP roof entry system now installed at a UK Police firing range, providing secure, weatherproof access while maintaining a clean and low-profile finish.

At Hill Grwp, we design and deliver fully integrated electrical layouts, tailored to your exact specifications. Inside each substation, you’ll find pre-installed switchgear, transformers, control panels, and protection systems, all factory-tested for smooth, fast commissioning.

In modern industrial and construction settings, materials must perform under pressure — offering strength, protection, and longevity. One material that consistently meets these standards is GRP (Glass Reinforced Plastic). At Hill Grwp, we design, and manufacture precision-built GRP enclosures and modular buildings engineered to protect essential equipment across the UK’s infrastructure, utilities, and energy sectors. 

From Our Factory to the Skyline! Another set of TopBox roof entries, freshly completed and waiting for dispatch. Right now they’re standing ready on the factory floor — but soon they’ll be lifted into place on rooftops, providing safe, compliant entry and long-term protection for critical services.

We recently designed, manufactured, and delivered a bespoke GRP substation with a C5 Corrosion Resistant painted steel base. Engineered for durability, safety, and operational efficiency, this unit demonstrates our capability to combine GRP technology with structural steel elements to meet complex site requirements.

We designed, manufactured, and supplied 2no. GRP TopBoxes specifically for a UK police firing range. Each unit was engineered to house ductwork and electrical containment in a safe, secure, and weather-protected environment. Key features include: - Integrated Access Hatches - Water-Sealed Construction - Durable GRP Fabrication - Custom Design These TopBoxes demonstrate our ability to provide specialist GRP solutions for challenging environments.

What does it take to get a rooftop entry system ready for delivery? For our latest Hill Grwp TopBox project, the answer is precision engineering, careful planning, and teamwork at every stage. This custom-built TopBox roof entry enclosure has just left our facility and is heading to site, where it will provide a safe, reliable, and cost-effective solution for controlled roof entry. At Hill Grwp, we design and manufacture TopBox GRP enclosures to make roof entry safer, simpler

Hill Grwp has successfully designed, manufactured, and delivered another bespoke GRP substation enclosure, fully pre-fabricated in-house to meet our client’s precise specifications. This solution demonstrates our commitment to delivering safe, reliable, and high-quality enclosure solutions for industrial and infrastructure projects:

In modern industrial and commercial construction, roof entry enclosures are a critical but often underestimated requirement. Whether it is for ductwork, pipework, or cable entry systems, the way services are routed through a building envelope has a direct impact on safety, compliance, and long-term operational performance. 

Behind every ⚡ “Danger of Death – Keep Out” sign is a responsibility:  - To protect the public  - To secure critical assets  - To support the industries that power our everyday lives. At Hill Grwp Ltd, safety isn’t just a feature of our GRP buildings—it's our promise.  

Our custom galvanised steel staircases provide a reliable, long-lasting access solution for a wide range of industrial and commercial environments — from utility facilities to power and energy infrastructure.  Each staircase is built to integrate seamlessly with GRP enclosures, prefabricated pump rooms, switchgear housings, and other modular building systems supplied by Hill Grwp.