Sub-hire is an essential part of running a rental company. No fleet covers every eventuality. When a client needs a 30K laser projector and you own a 20K, you sub-hire the difference. When festival season hits and your entire lighting rig is out, you sub-hire to cover the corporate job that just came in. It's practical, it's common, and when managed well, it's profitable.
When managed badly, it's one of the fastest ways to erode your margins without realising it.
Why sub-hire management matters
Sub-hire introduces complexity that owned equipment doesn't. You're dealing with another company's stock, their availability, their pricing, their delivery schedules, and their terms. Every sub-hired item on a job represents a dependency on a third party - and dependencies create risk.
The financial impact is straightforward. If you charge a client your standard rate for an item you don't own, your margin is the difference between your rate and the sub-hire cost. That margin needs to cover: the administrative overhead of arranging the sub-hire, any delivery or collection costs, the risk of damage charges, and your profit.
Many rental companies don't track sub-hire costs at the project level. The sub-hire invoice comes in, gets paid from general expenses, and the project looks profitable on paper. In reality, the margin has been significantly reduced - sometimes eliminated entirely.
Building reliable supplier relationships
Your sub-hire suppliers are partners, not just vendors. The relationship you build with them directly affects your ability to serve your clients.
Key principles
- Reciprocity - the best sub-hire relationships are two-way. If you sub-hire from a company regularly, be willing to supply them when they need stock. This creates mutual dependency and better pricing.
- Advance notice - giving suppliers as much lead time as possible gets you better availability and often better rates. Last-minute sub-hire requests command premium pricing.
- Consistent payment - pay your sub-hire invoices on time, every time. Suppliers prioritise reliable payers when stock is tight.
- Honest communication - if a job cancels, let the supplier know immediately so they can re-allocate the equipment. Holding stock you don't need damages the relationship.
- Damage handling - return sub-hired equipment in the condition you received it. If damage occurs, report it honestly and promptly. Trying to hide damage destroys trust.
Tracking sub-hire costs properly
Every sub-hire cost should be recorded against the specific project it serves. This is non-negotiable for understanding true project profitability. Your system should capture:
- Supplier name and contact - who you're hiring from
- Item description and specification - what you're getting, in enough detail to confirm it matches requirements
- Hire period - start date, end date, any extension terms
- Cost - daily or weekly rate, plus any delivery/collection charges
- Client charge - what you're billing the client for this item
- Margin - the difference, calculated automatically
- Purchase order number - for reconciling supplier invoices
When you can see sub-hire cost alongside project revenue in a single view, decisions become clearer. Is this job actually profitable? Would it be cheaper to buy this item given how often we sub-hire it? Are we consistently sub-hiring from the most cost-effective supplier?
The buy-versus-sub-hire calculation
One of the most valuable outputs of good sub-hire tracking is the data to support purchase decisions. If you're sub-hiring the same item repeatedly, at some point it's cheaper to own it.
The break-even calculation:
- Annual sub-hire cost for the item (total of all sub-hires over 12 months)
- Purchase price of owning the equivalent item
- Annual ownership costs (maintenance, insurance, storage, depreciation)
If annual sub-hire cost exceeds the annualised ownership cost, buying makes financial sense - provided you believe the demand will continue. A moving head that you sub-hired 40 times last year at an average of 3 days each at 80 per day cost you 9,600 in sub-hire. If the purchase price is 6,000 and annual ownership costs are 1,500, you'd save 2,100 per year by owning it.
But this calculation only works with accurate data. If sub-hire costs are buried in general expenses, you can't make this analysis. You'll keep renting what you should be buying.
Sub-hire workflow best practices
Request and approval
Not every sub-hire should happen automatically. Establish approval thresholds: items under a certain value can be sub-hired by the project manager directly. Above that threshold, a second approval is required. This prevents unnecessary sub-hire on jobs where alternatives exist (substitution from your own stock, negotiating the specification with the client).
Supplier selection
Maintain a rated list of sub-hire suppliers for each equipment category. Rate them on: pricing, reliability, equipment condition, delivery flexibility, and ease of doing business. When a sub-hire need arises, check preferred suppliers first.
Collection and return
Sub-hired equipment needs to be distinguished from owned equipment in your warehouse. Tag it clearly. Store it separately if possible. The last thing you want is sub-hired equipment accidentally going out on a different job or, worse, getting lost in your own stock.
Process returns promptly. Sub-hire charges typically run until the equipment is back with the supplier. Holding sub-hired equipment in your warehouse for three extra days because nobody arranged the return costs you money for nothing.
Damage inspection
Inspect sub-hired equipment when it arrives and document its condition with photos. Do the same when it returns from your job. This protects you against being charged for pre-existing damage and ensures you have evidence if damage occurs during your hire period.
Managing sub-hire during peak periods
Peak season stress-tests your sub-hire relationships. When every rental company in the region needs the same equipment simultaneously, availability drops and prices rise. Strategies to manage this:
- Book early - reserve sub-hire equipment as soon as projects are confirmed, even if the exact spec isn't finalised
- Diversify suppliers - don't depend on a single source. Maintain relationships with three or four suppliers for your most commonly sub-hired categories
- National suppliers - look beyond your local area. Delivery costs for equipment shipped from another city may be less than the premium pricing from a local supplier during peak
- Negotiate seasonal agreements - for equipment you know you'll need every festival season, negotiate rates and availability in advance
- Track lead times - know how far in advance each supplier needs for different equipment types
Sub-hire and client transparency
Should clients know when equipment is sub-hired? In most cases, they don't need to and shouldn't care - they're hiring from you, and you're responsible for the equipment regardless of ownership. Your service commitment doesn't change.
The exception is when sub-hire affects the specification. If the client requested a specific brand or model and you're providing an alternative via sub-hire, that's a conversation to have upfront. Transparency builds trust; surprises on site destroy it.
Measuring sub-hire performance
Key metrics to track monthly:
- Sub-hire as percentage of project costs - is it growing or stable?
- Average sub-hire margin - are you maintaining acceptable margins on sub-hired items?
- Most frequently sub-hired items - candidates for purchase
- Supplier reliability rate - how often does each supplier deliver on time and to spec?
- Sub-hire return timeliness - are you returning equipment promptly or paying for extra days?
Sub-hire isn't a problem to eliminate. It's a capability to manage well. The companies that do it best treat sub-hire as a strategic function - tracked rigorously, managed proactively, and optimised continuously. The result is a business that can say yes to almost any job without the capital commitment of owning everything.