Brands that manufacture in-house spend an average of 34% more per unit on production at volumes below 500 units than those using contract manufacturers — yet McKinsey’s State of Fashion research consistently identifies in-house production as the preferred long-term model for brands that achieve significant scale.
That apparent contradiction is the heart of this decision. Contract manufacturing and in-house production are not competing philosophies. They are different tools for different stages — and choosing the wrong one at the wrong stage is one of the most expensive structural mistakes a clothing brand can make.
Summary
- Contract manufacturing means outsourcing production to an external factory; in-house production means owning or leasing the manufacturing infrastructure yourself
- Contract manufacturing is almost always the right model for startup and early-growth brands — lower capital requirement, faster setup, no fixed overhead
- In-house production only becomes commercially viable at sustained volumes above 500 to 1,000 units per style per season for most product types
- The decision is not permanent — most successful UK clothing brands begin with contract manufacturing and evaluate in-house only when volume and margin justify the capital investment
- Hidden costs on both sides — factory onboarding, quality management, and IP risk for contract; equipment, labour, and space for in-house — must be fully modelled before a decision is made
Contents
- 1 Defining the Two Models
- 2 The Economics of Contract Manufacturing
- 3 The Economics of In-House Production
- 4 Quality Control: Contract vs In-House
- 5 IP and Confidentiality: A Real Risk in Contract Manufacturing
- 6 When to Consider Moving From Contract to In-House
- 7 Common Mistakes Brands Make When Choosing Between the Two Models
- 8 FAQ
- 8.1 At what volume does in-house production become cheaper than contract manufacturing?
- 8.2 Can a startup clothing brand do in-house production from day one?
- 8.3 Does contract manufacturing mean I lose control of quality?
- 8.4 What happens to my tech pack and patterns if I end a contract manufacturing relationship?
- 8.5 Is hybrid production — some in-house, some contract — a realistic model for a growing brand?
- 9 Making the Right Call at the Right Stage
- 10 Citations and Sources
Defining the Two Models
Most beginner resources describe contract manufacturing as “using a factory” and in-house production as “making it yourself.” Both descriptions are accurate and almost entirely useless for making a commercial decision.
Contract manufacturing means engaging an external manufacturer — a factory with its own equipment, workforce, and production infrastructure — to produce your garments to your specification. You own the design. The factory owns the means of production.
In-house production means owning or leasing the production infrastructure yourself — sewing machines, cutting tables, pressing equipment, quality control stations — and employing or contracting the workforce to operate it.
| Factor | Contract Manufacturing | In-House Production |
|---|---|---|
| Capital requirement | Low — no equipment purchase | High — £50,000–£500,000+ setup |
| Fixed overhead | None — cost is per unit | High — rent, equipment, labour |
| Flexibility | High — scale up or down | Low — fixed capacity |
| Quality control | Indirect — via factory relationship | Direct — full control |
| IP security | Moderate — factory sees your spec | High — spec stays internal |
| Speed to first production | Fast — weeks | Slow — months to years |
| Viable from | 1 unit (POD) to 30+ (CMT) | 500+ units per style |
What guides get wrong: in-house production is frequently presented as the “premium” option — more control, better quality, stronger brand story. Control and quality are real advantages. They come at a capital and operational cost that most early-stage brands cannot sustain and should not attempt.
The Economics of Contract Manufacturing
Contract manufacturing converts fixed production cost into variable cost. You pay per unit produced — no more, no less.
UKFT manufacturing data shows UK contract manufacturers now accommodate small-batch production from 30 units for CMT work on jersey styles — a significant reduction from the 100-unit floors that were standard a decade ago.
At the early stage, this variable cost structure is a structural advantage. Your cash is not locked into equipment, rent, or a permanent workforce. Every pound of capital can go into product development, stock, and marketing.
| Volume | Contract Unit Cost (Jersey, UK CMT) | Equivalent In-House Unit Cost | In-House Saving |
|---|---|---|---|
| 50 units | £14–£18 | £22–£30 | None — in-house is more expensive |
| 100 units | £10–£13 | £16–£22 | None — in-house still more expensive |
| 500 units | £7–£9 | £9–£13 | Marginal — 10–20% |
| 1,000 units | £6–£8 | £6–£9 | Breaking even |
| 2,000+ units | £5–£7 | £4–£6 | In-house starts to win |
The in-house cost model assumes: rented production space in the UK at £15–£25 per sq ft annually, equipment depreciated over five years, and skilled machinists at UK Living Wage rates. It does not include management overhead, quality control staff, or the capital cost of equipment purchase.
The crossover point — where in-house production achieves lower unit cost than contract manufacturing — sits at approximately 1,500 to 2,000 units per style per season for most UK product types.
Our guide to low MOQ and private label clothing manufacturers UK covers how to structure contract manufacturing relationships at low volume to maintain quality and margin while you build toward that scale.
The Economics of In-House Production
In-house production converts variable cost into fixed cost. Below a certain volume, that fixed cost is a drag on margin. Above it, the fixed cost is spread thinly enough to produce a meaningful unit cost advantage.
The setup cost of a genuine in-house production operation in the UK:
| Item | Low Estimate | High Estimate |
|---|---|---|
| Industrial sewing machines (per unit) | £1,500 | £5,000 |
| Cutting table and equipment | £2,000 | £8,000 |
| Pressing and finishing equipment | £1,500 | £6,000 |
| Production space (annual, per 1,000 sq ft) | £15,000 | £35,000 |
| Pattern cutting software and hardware | £2,000 | £8,000 |
| First year workforce cost (2 machinists) | £40,000 | £60,000 |
| Total Year 1 (minimum viable setup) | £62,000 | £122,000+ |
British Fashion Council research on UK manufacturing investment identifies undercapitalisation as the primary reason in-house production attempts by early-stage brands fail — the operation is set up too small to cover its fixed costs at realistic first-year volumes.
A brand producing 200 units per style per season with a £70,000 annual fixed cost base is carrying £350 in fixed overhead per unit before a single thread is sewn. At 2,000 units, that drops to £35 per unit. The economics are brutally volume-dependent.
“We have worked with brands who moved to in-house too early — usually after one strong season convinced them they had outgrown contract manufacturing. Without exception, the ones who moved before they were ready spent 18 months unwinding the decision and its costs. In-house is right for some brands. It is right at the right time, not the right ambition.” — Silk Routes Manufacturing Team
Quality Control: Contract vs In-House
Quality control is the most frequently cited reason brands consider in-house production. The logic is straightforward — if you own the factory floor, you control what happens on it.
The reality is more nuanced.
Textile Exchange research on garment quality management shows that contract manufacturers with structured QC processes — mid-production checks, sealed sample standards, final inspection protocols — achieve defect rates comparable to in-house operations at equivalent volumes.
The quality advantage of in-house production is real. It becomes decisive when:
- Your product has highly complex construction where factory communication consistently fails to translate
- Your brand’s reputation rests on a precision standard that cannot be specified in a tech pack
- Your volume justifies the overhead of a dedicated QC team embedded in production
For most brands below 1,000 units per style, structured contract manufacturing QC — sealed sample, mid-production check, final inspection — delivers comparable quality outcomes at a fraction of the overhead cost.
| QC Factor | Contract Manufacturing | In-House Production |
|---|---|---|
| Mid-production access | Requires factory cooperation | Direct |
| Defect correction speed | 1–3 days (factory schedule) | Immediate |
| Sealed sample standard | Factory holds reference | Internal reference |
| QC team cost | Included in unit price | Additional headcount |
| Oversight of subcontractors | Indirect | Direct (if no subcontracting) |
If you want to know how Silk Routes structures quality control on contract runs from 30 units upward, speak to our manufacturing team about our production process.
IP and Confidentiality: A Real Risk in Contract Manufacturing
In-house production has one unambiguous advantage over contract manufacturing: your design, pattern, and construction spec never leave your building.
In contract manufacturing, your tech pack — which contains your full product specification — is shared with the factory. For most products and most factories, this is not a significant risk. For products with genuinely novel construction, proprietary materials, or design elements that cannot easily be replicated, it is worth addressing directly.
UK intellectual property law protects registered trademarks, registered designs, and patents. Unregistered design rights also apply automatically in the UK for original designs. But legal protection after the fact is slower and more expensive than contractual protection before it.
Three practical steps to protect IP in a contract manufacturing relationship:
1. Non-disclosure agreement before briefing Have the factory sign an NDA before you share your tech pack. Most reputable UK manufacturers will sign without hesitation. Resistance to an NDA is itself a signal.
2. Registered design for distinctive visual elements If your product has a distinctive shape, silhouette, or surface pattern, register it as a UK design at the UKIPO before sharing with any factory. Registration costs £50 and takes four to eight weeks.
3. Ownership clause in the purchase order Your purchase order should explicitly state that all patterns, tech packs, and design documentation remain the intellectual property of the brand. Most factories accept this as standard. It creates a clear contractual basis if a dispute arises.
When to Consider Moving From Contract to In-House
The transition from contract to in-house production is a capital investment decision, not a quality decision or a brand identity decision.
The conditions that justify evaluating in-house:
| Condition | Threshold |
|---|---|
| Consistent volume per style | 1,000+ units per season |
| Reorder frequency | 4+ runs per year per style |
| Product complexity | Beyond standard contract capability |
| Quality failure rate on contract | Consistently above 3–5% per run |
| Margin compression from contract | 5%+ margin lost to unit cost premium |
| Geographic concentration | All production in one location (risk) |
Meeting two or three of these conditions simultaneously is the signal to model the in-house business case. Meeting one of them is not.
The transition model that works most reliably: hybrid production. Contract manufacturing handles standard styles and reorders. In-house handles new development, complex construction, and speed-to-market for reactive drops. The in-house operation starts small — two or three machines, two machinists — and scales as volume justifies the additional fixed cost.
Our guide to low MOQ and private label clothing manufacturers UK covers how to structure your contract manufacturing relationships to retain flexibility as your volume grows toward the in-house threshold.
Common Mistakes Brands Make When Choosing Between the Two Models
1. Moving in-house after one strong season One strong season does not confirm sustainable volume. It confirms one season. The fixed cost of in-house production requires sustained volume across multiple seasons to justify.
Fix: Require three consecutive seasons of consistent volume above 1,000 units per style before modelling an in-house business case. One season is data. Three seasons is a pattern.
2. Underestimating in-house workforce cost Equipment is the visible cost of in-house production. Workforce — skilled machinists, a production manager, a QC lead — is the larger ongoing cost and the harder one to scale down when volume drops.
Fix: Model workforce cost at three scenarios: target volume, 30% below target, and 50% below target. If the model fails at 30% below target, the fixed cost base is too high.
3. Treating contract manufacturing as temporary Brands that treat contract manufacturing as a stepping stone — something to endure until they can afford in-house — consistently underinvest in the contract relationship. They get worse service, worse quality, and worse terms than brands who treat it as a permanent and valued partnership.
Fix: Invest in your contract manufacturing relationship as if it is permanent. Give clear briefs. Pay on time. Provide feedback. The brands that get priority slots and flexible MOQs are the ones the factory wants to keep.
4. Ignoring the hybrid model The choice is not binary. Contract manufacturing for standard production and in-house for development and reactive production is a viable structure for mid-scale brands that want speed and control without full fixed cost exposure.
Fix: Model the hybrid option before committing to either extreme. A small in-house development capability combined with contract production for scale is often the most commercially efficient structure at 300 to 800 units per season.
5. Not protecting IP before sharing with contract factories An NDA and a registered design are inexpensive compared to the cost of a competitor producing a copy of your core product with the same factory.
Fix: Register distinctive design elements before briefing any contract manufacturer. Have every factory sign an NDA before receiving your tech pack.
FAQ
At what volume does in-house production become cheaper than contract manufacturing?
For most UK clothing product types, the unit cost crossover point sits between 1,500 and 2,000 units per style per season. Below that volume, in-house fixed costs — space, equipment, workforce — produce a higher effective unit cost than contract manufacturing. The crossover varies by product complexity, UK labour rates, and the specific contract manufacturer’s pricing structure.
Can a startup clothing brand do in-house production from day one?
Technically yes. Commercially, almost never. The minimum viable in-house setup in the UK costs £60,000 to £120,000 in Year 1 including space, equipment, and workforce. A startup producing 50 to 200 units per style cannot distribute that fixed cost at a unit price that competes with contract manufacturing. In-house from day one makes sense only for founders with production skills, owned equipment, and a business model where handmade or artisan production is the core brand proposition.
Does contract manufacturing mean I lose control of quality?
Not if the contract relationship is structured correctly. A sealed pre-production sample, a mid-production QC check, and a final inspection protocol before payment give a brand significant quality control over a contract run. The control is indirect compared to in-house — but the outcome, for most product types at most volumes, is comparable.
What happens to my tech pack and patterns if I end a contract manufacturing relationship?
Your tech pack and patterns remain your intellectual property regardless of who produced them — provided your purchase order includes an explicit IP ownership clause. Without that clause, the legal position is less clear. Always include IP ownership language in your purchase order and recover all physical patterns from a factory at the end of a relationship.
Is hybrid production — some in-house, some contract — a realistic model for a growing brand?
Yes, and it is often the most commercially efficient structure for brands at 300 to 800 units per season. A small in-house development and sampling capability reduces the cost and time of the development stage. Contract manufacturing handles production scale without requiring the full fixed cost of an in-house operation. The model works when the brand has enough volume to justify the in-house development overhead and enough production consistency to keep contract slots filled.
Making the Right Call at the Right Stage
Contract manufacturing and in-house production are not a quality hierarchy. They are a volume and capital hierarchy.
The brand that chooses contract manufacturing at 100 units and in-house at 2,000 units has made two correct decisions at two different stages. The brand that chooses in-house at 100 units has made one expensive mistake that will constrain its growth for the next two years.
The decision framework is simple: model the full unit economics of both options at your current volume and your projected volume in 18 months. If contract manufacturing delivers comparable quality at lower total cost — which it will for most brands below 1,000 units per style — it is the right model. Review the decision at every significant volume milestone.
For the full picture on how to structure your contract manufacturing relationships in the UK — from first run to reorder — our guide to low MOQ and private label clothing manufacturers UK covers everything you need before you place your first order.
Ready to discuss how contract manufacturing works at Silk Routes for your specific product and volume? Find out how we work with brands from first sample to full production.
Citations and Sources
[1]. McKinsey & Company — The State of Fashion 2024. https://www.mckinsey.com/industries/retail/our-insights/state-of-fashion-2024
[2]. UKFT — UK Fashion & Textile Industry: Facts and Figures 2024. https://ukft.org/facts-and-figures24/
[3]. British Fashion Council — Reports and Research. https://www.britishfashioncouncil.co.uk/About/Reports
[4]. Textile Exchange — Materials Market Report 2023. https://textileexchange.org/knowledge-center/reports/materials-market-report-2023/
[5]. UK Government — Intellectual Property: Trade Marks and Design Registration. https://www.gov.uk/how-to-register-a-trade-mark
