MRP - Materials Requirement Planning - sounds like something only large factories need. The acronym conjures images of SAP consultants, six-figure implementation budgets, and 18-month rollout timelines. For a workshop owner with 15 employees, it feels like overkill. And frankly, in its traditional form, it is.
But the core problem MRP solves - knowing what materials you need, when you need them, and how much to order - is universal. Whether you're running a 5-person joinery shop or a 50-person kitchen manufacturer, running out of board mid-job or drowning in excess stock costs real money. The question isn't whether you need materials planning. It's how much of it you need.
In this guide
What Is MRP and Why Small Manufacturers Need It
At its simplest, MRP answers three questions: What materials do I need? How much do I already have? What do I need to order? It does this by looking at your open orders, calculating the materials required to fulfil them, comparing that against your current stock, and telling you what's missing.
For small manufacturers, this matters because material costs are typically 40-60% of total job costs. Getting materials planning wrong means either tying up cash in excess stock or halting production because a critical board or component isn't available. Both scenarios directly hurt your profitability and your ability to deliver on time.
The Small Manufacturer's Dilemma
Most small workshops manage materials by gut feel and experience. The purchasing person "just knows" what to order. This works until they go on holiday, leave the business, or the order book changes faster than their mental model can keep up. MRP replaces gut feel with data.
Enterprise MRP vs. Right-Sized MRP
Traditional enterprise MRP systems (SAP, Oracle, Epicor, SYSPRO) were designed for large factories with complex multi-level bills of materials, hundreds of product lines, and dedicated planning departments. They're powerful, but they come with serious drawbacks for small manufacturers:
Enterprise MRP
- -£50,000-500,000+ implementation cost
- -6-18 month rollout timeline
- -Requires dedicated IT staff or consultants
- -Hundreds of configuration options you'll never use
- -Complex interfaces that discourage adoption
- -Designed for mass production, not bespoke
Right-Sized MRP
- £2,000-6,000/year - all inclusive
- Up and running in days, not months
- No IT staff needed - designed for workshop teams
- Only the features you actually use
- Simple interface anyone can learn quickly
- Built for bespoke manufacturing workflows
The Essential MRP Features for a 5-50 Person Workshop
Strip away the enterprise complexity, and here are the MRP features that actually matter for a small manufacturer:
1. Demand Calculation
The system looks at your open orders and calculates the total materials needed. For a kitchen manufacturer, that means knowing exactly how many sheets of 18mm MFC, how many metres of edging tape, and how many sets of hinges you need across all your active jobs. This replaces the mental arithmetic or manual spreadsheet tallying that most workshops rely on today.
2. Stock Level Tracking
You need to know what you have before you can know what to order. A good system tracks your current stock levels, records when materials are received, and deducts usage as materials are allocated to orders. For workshops with limited warehouse space, this is especially important - you don't want to order materials you can't store.
3. Purchase Order Suggestions
The most valuable MRP feature for small manufacturers is automatic purchase order suggestions. The system compares demand against stock and tells you: "You need to order 15 sheets of Cashmere Grey 18mm to cover your orders for the next two weeks." This eliminates guesswork and prevents both stock-outs and over-ordering.
4. Low Stock Alerts
Set minimum stock levels for your most-used materials, and get alerted when stock drops below the threshold. This is your safety net - even if you're not running full MRP calculations, low stock alerts prevent the worst-case scenario of discovering you're out of a critical material on the morning it's needed.
5. Supplier Management
Track which suppliers provide which materials, their lead times, and their pricing. When the system suggests a purchase order, it should know which supplier to recommend based on your established relationships and delivery timeframes. This streamlines the purchasing process and helps you make better decisions about when to place orders.
That's It. Five Features.
Enterprise MRP has hundreds of features. You need five. Demand calculation, stock tracking, PO suggestions, low stock alerts, and basic supplier management. Everything else is either a nice-to-have or actively unnecessary for a small workshop.
What You DON'T Need (And What Adds Unnecessary Cost)
Enterprise MRP vendors will try to sell you features designed for automotive factories and pharmaceutical companies. Here's what you can safely ignore:
Multi-level Bill of Materials (BOM) explosions
If you're making bespoke furniture, each order is different. You don't have standardised product structures with sub-assemblies and components. A simple materials list per order is far more practical than nested BOMs.
Capacity planning and scheduling algorithms
Enterprise MRP includes complex capacity planning engines that model machine availability, shift patterns, and resource constraints. For a small workshop, a visual production board where you can see and move jobs is far more intuitive and practical.
Lot tracking and serial number management
Essential for pharmaceutical and food manufacturing, but unnecessary for most furniture and kitchen workshops. Unless you have regulatory requirements for material traceability, this adds complexity without value.
Master Production Scheduling (MPS)
MPS is used in factories that produce standardised products in planned batches. Bespoke manufacturers work to order, not to forecast. You need order-driven demand, not forecast-driven planning.
Advanced warehouse management
Bin locations, zone management, and wave picking are designed for large warehouses with thousands of SKUs. If your materials storage is a racking system and a corner of the workshop, you don't need a warehouse management module.
Every unnecessary feature adds cost - both in software licensing and in the time it takes to configure, learn, and maintain. The right MRP for a small manufacturer is one that gives you the essentials without burying you in complexity.
How to Evaluate MRP Software for Your Workshop
When evaluating MRP options, use these criteria to separate the right-sized solutions from the enterprise overkill:
Can you get started in under a week?
If the vendor quotes an implementation timeline measured in months, the system is too complex for your needs. You should be entering real orders and tracking real stock within days.
Is materials planning integrated with order management?
Standalone MRP that doesn't connect to your orders is just another data silo. The whole point is that demand is calculated automatically from your order book - not entered manually into a separate system.
Does it handle bespoke/variable products?
If the system requires you to define rigid product structures before you can plan materials, it's designed for standardised manufacturing. Bespoke manufacturers need flexible materials lists that can change per order.
Is the pricing transparent and predictable?
Beware of per-user pricing that scales unpredictably, or implementation fees that dwarf the annual subscription. Look for flat-rate or simple tiered pricing that you can budget for.
Does the vendor understand your industry?
Ask the vendor to show you how their system handles a real scenario from your workshop. If they can't demonstrate it fluently, they're selling you a generic tool, not an industry solution.
The right MRP solution for a small manufacturer isn't a stripped-down version of an enterprise system. As Make UK (the manufacturers' organisation) consistently advocates, small manufacturers need tools built for their scale, not watered-down enterprise software. It's a purpose-built tool that gives you exactly what you need - materials visibility, stock tracking, and purchase order suggestions - integrated into the order management and production workflows you already use every day.