​Capacity Planning For Growth. What Should You Make And What Should You Buy?

by | Nov 12, 2026

How To Balance Cost Control And Flexibility Before Committing To More Internal Capacity

A bigger order book is good news. It can also create pressure to add people, equipment and internal capacity before the business has had time to understand what that growth will really require. 

That pressure is understandable. No leadership team wants to miss an opportunity because it moved too slowly. But decisions made in a hurry can commit cash, inventory, suppliers and specialist skills for years. 

Capacity planning is therefore only part of the picture. Leadership teams also need to ask: what do we need to own to deliver well, and where could we remain more flexible? 

​Look Beyond The Traditional Make Or Buy Calculation

In our work with clients, make or buy decisions are rarely just about the relative cost of internal production and an external supplier. They affect the wider supply chain strategy and the way the operating model works. 

Some capabilities clearly belong inside the business. They may protect intellectual property, security, product quality or continuity of delivery. They may also depend on knowledge and experience that people within the organisation have built up over many years. 

Other capabilities may be better accessed through suppliers, partners or flexible manufacturing capacity. This can help a manufacturer respond to demand without immediately committing to more fixed cost. 

We are not advocating outsourcing manufacturing by default. Our role is to help the people making these decisions develop a clear, shared view of where ownership creates a genuine advantage and where external capability could provide better economics or greater flexibility. 

A traditional insourcing versus outsourcing assessment may focus heavily on unit cost. A decision made in response to growth needs to consider the full commitment: 

  • What capital and working capital will be required? 
  • How quickly can the internal and external options scale? 
  • Do suppliers have the capability and incentive to support the plan? 
  • How difficult would the decision be to reverse if demand or the product changed? 
  • What new risks would each option create? 

The lowest-cost answer today may not be the best choice over the life of the product or contract.

 

Four Questions To Test Before Adding Capacity

Before committing to permanent capacity, leadership teams should be able to answer four questions. 

What must we control? 
Identify the capabilities where ownership is essential because of intellectual property, security, quality, customer commitments or supply risk. 

What could we access externally? 
Consider where suppliers, strategic partners or flexible manufacturing capacity could provide expertise, scale or responsiveness without a permanent internal commitment. 

How reversible is the decision? 
Understand whether equipment, people and inventory could be redeployed if demand, technology or product requirements changed. 

When will growth generate cash? 
Test how much working capital the business must commit before the additional revenue begins to produce a return. 

These questions will produce different answers across procurement, operations, engineering, commercial and finance teams. That is to be expected. Each function sees a different part of the risk. 

The important step is to bring those perspectives together early, using the same facts and assumptions. When people can see the whole picture, the trade-offs become clearer and the business is more likely to reach a decision it can put into practice.

Make Growth A Deliberate Operating Model Choice

Growth should not automatically lead to more internal capacity. Nor should manufacturers outsource capabilities simply to avoid investment. 

The right answer depends on where the business needs control, where suppliers can add value and how much flexibility is worth under different demand scenarios. 

These decisions are best made with the people who understand the products, customers and operation. We work alongside them to consider cost, capacity and supply risk together. We do not arrive with a predetermined answer; we help the team make a choice that works commercially and can be delivered in practice. 

As part of the FourCentric group, we can draw on wider expertise across procurement, supply chain and operations when decisions cross functional boundaries. Jeremy Smith, our Managing Director, takes a broader look at the subject in a longer article on the FourCentric website. He considers how product strategy, supply chain design and investment decisions need to work together as manufacturers prepare for growth. 

​​

Nov 11 2026

Autumn Budget Review

The Government’s 2026 Budget puts efficiency, strategic procurement and public sector productivity firmly in focus. Explore what the...
Nov 11 2026

Black History Month – Colleague Spotlight

Born in Lagos, Nigeria, and raised partly in the UK, Serena Adebisi shares her journey of embracing her Nigerian heritage, celebrating...
Nurses walking in hospital
Nov 04 2026

NHS Devolution 2.0: Five Questions Leaders Can’t Afford to Ignore​

NHS devolution is reshaping the future of health and care. Discover five critical questions NHS leaders should address to strengthen...
Nov 03 2026

Beyond The Build: Is The Nuclear Supply Chain Ready For What Comes Next?

The UK’s nuclear ambitions are growing, but is the supply chain ready to deliver? Explore the challenges facing the nuclear sector,...
Oct 20 2026

What Is Your Inventory Trying To Tell You?

Inventory is more than stock on hand. It reveals how supply chain decisions, planning policies and operational behaviours affect service,...
consultants talking
Oct 14 2026

7 Signs Your Procurement Team Needs Additional Capacity

Discover seven warning signs that your procurement team may be overstretched and learn how to increase procurement team capacity before...
Oct 13 2026

The Reconfiguration Journey: Data First, Tools Second, Agents Last

Discover why successful AI transformation starts with trusted data. Learn why procurement leaders should prioritise data, tools and then...
Oct 13 2026

The Data Centre Gold Rush 

The global data centre boom is creating unprecedented demand for infrastructure, but constrained supply is putting pressure on both cost...
Oct 13 2026

In The News: How Weight-loss Drugs Are Changing What The UK Buys

Weight-loss drugs are reshaping UK consumer habits, creating new challenges and opportunities for retailers, food manufacturers and...
Oct 12 2026

In The News: How Banks Can Turn Cost Savings Into AI Investment

Discover how banks can turn cost savings into AI investment. Sebastian Kay explores how cost optimisation, zero-based thinking and...

Get in touch to see how we can transform challenges into results