Hill Grwp is a trusted Welsh engineering company based in Swansea, established in 1980. We specialise in the design and manufacture of custom industrial GRP enclosures and prefabricated utility housings for commercial, industrial, and energy infrastructure across the UK.

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Our core product range includes:

• Pre-packaged sprinkler pump rooms

• Modular GRP switchgear substations

• Oil & gas metering housing solutions

• GRP weatherproof and fire-rated enclosures

• The TopBox roof access system – a secure and compliant rooftop entry kiosk

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All systems are engineered for performance, longevity, and UK regulatory compliance. Our fire-rated GRP enclosures, acoustic kiosks, and composite switchgear housings are designed to withstand harsh environments while reducing installation time and site disruption.

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The TopBox GRP roof access unit is our innovative rooftop entry solution, purpose-built for the safe installation of pipework, ducting, and cabling in commercial and industrial buildings. It's ideal for HVAC, mechanical, and electrical applications, offering a weather-resistant and secure access point for contractors and engineers.

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From factory-built GRP housing units to bespoke enclosures with integrated HVAC and lighting, Hill Grwp provides fully assembled, pre-tested systems that meet the needs of today’s fast-moving infrastructure projects. Whether you need GRP substations for energy networks, roof access systems for industrial buildings, or low-maintenance GRP kiosks, we deliver nationwide with consistent quality and expert support.

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As a UK leader in industrial GRP enclosures, we combine technical expertise with hands-on experience to support utilities, renewables, fire protection, and industrial sectors. From our Swansea headquarters, we serve clients throughout Wales, England, and beyond.