Answer extracted from the Glazing Insider podcast — listen to the full episode below.
How did a hardware distributor transition into composite door manufacturing without internal manufacturing expertise?
The company started by selling PVC door panels as an agent rather than a manufacturer, then shifted to prep slabs—adding hardware to door frames without building complete sets. When a supplier cut them off during the 2008 financial crisis, they doubled down on this prep slab model and eventually invested in CNC machinery around 2017-2018, allowing them to move into full door set manufacturing while learning the equipment themselves.
The prep slab strategy: staying in distribution, not manufacturing
In the early 2000s, AMK Hardware recognized that selling PVC door panels as an agent had a fundamental problem: limited shelf life meant inventory risk and profit erosion. Rather than attempt to build a manufacturing operation from scratch, the company pivoted to an intermediate model that kept them firmly in their distribution comfort zone.
Greg Kelly explains in the Glazing Insider episode that they began preparing slabs—essentially taking door frames and adding hardware components installers needed, then letting them fit the frames into their own pre-prepared slabs. This avoided the capital expense and complexity of setting up a full composite door manufacturing line while still offering value-added service to their customer base.
This model worked because it required only modest investment in assembly and hardware stocking, not tooling or production machinery. For a company born from hardware distribution, it was a natural extension of what they already knew: sourcing, inventory management, and customer relationships.
Crisis and focus: 2008-2009 turns prep slabs into a core business
When the financial crisis hit in 2008-2009, a major supplier cut them off, forcing a painful strategic reckoning. Rather than chase new suppliers for the product categories they'd been representing, the company refocused entirely on the prep slab operation they'd already built.
This forced focus became their competitive advantage. They owned the customer relationship, understood the assembly process, and could control quality without relying on external manufacturers. The crisis, in retrospect, eliminated distraction and clarified their direction.
The 2017-2018 pivot: investing in CNC and full manufacturing
By 2017-2018, demand had grown enough to justify full door set manufacturing. AMK invested in CNC machinery to begin cutting composite door slabs in-house, a dramatic step up from prep assembly. Critically, Kelly himself learned to operate the equipment—a decision that reflected both his hands-on leadership and a hard lesson about avoiding over-dependence on a single skilled operator.
This self-education served the remote-managed business well. With operations split between Northern Ireland and the UK mainland, having the owner able to troubleshoot and operate the machines reduced bottlenecks and gave the team flexibility when staffing challenges arose.
"We're not the cheapest, we're not the most expensive, but we offer good value for money and a nicely made product for the price that we charge."
Greg Kelly — Owner and Director, AMK Hardware & Entrance Composite Door Solutions. Born into the hardware trade after his father founded a distributor in Northern Ireland in 1980, Kelly joined the family business in 2000 and led its evolution from hardware distribution into composite door manufacturing, now managing 58 staff across three sites and producing 60–80 door sets per week.
The full story of how remote management and Brexit shaped their supplier strategy, as well as the specific customer wins that accelerated their move into manufacturing, are explored in depth in the full episode on Listenly.
See also
What were the major business milestones marking growth from startup ownership to current scale?
Key milestones included acquiring Jade and owning their own facility again after operating in a rented engineering workshop, marking significant steps in scaling the business.
How has Jade Engineering positioned itself within the broader window fabrication supply chain?
Jade Engineering has positioned itself in the middle of the window industry with reach to many different places, maintaining portfolio information and deep integration across the supply chain.
What role does consulting add to a tooling and fabrication supplier's value proposition?
Customers often come with a problem or requirement but don't know what the outcome needs to look like—consulting expertise helps design and define solutions tailored to each client.
Key takeaways
- Prep slabs were a bridge model: adding value without requiring full manufacturing capability, keeping risk and capital investment low.
- The 2008 financial crisis forced strategic focus, turning a transitional product into a sustainable core business.
- CNC investment in 2017-2018 marked the move into full door set production, enabled by the owner learning the machinery himself to reduce operational dependency.
- Starting from distribution rather than manufacturing meant learning the fabrication business incrementally, without the capital shock of a greenfield plant.