3PL KPIs and SLAs: What to Put in a UK Fulfilment Contract
03/11/2026 | Share:
When you hand your orders to a fulfilment provider, you hand over a large part of your customer experience. Every parcel that leaves late, arrives with the wrong item or goes missing reflects on your brand, not on the warehouse that packed it.
That is why the performance measures in your fulfilment contract matter so much. Clear key performance indicators (KPIs) tell you whether your 3PL is doing its job. A clear service level agreement (SLA) turns those measures into commitments, sets out how they are reported and says what happens when they are missed.
This guide explains the KPIs that matter most for UK eCommerce fulfilment, how each one should be measured, what belongs in a fulfilment SLA, and how to use the numbers to manage the relationship rather than just argue about it. It is written by Ogden Fulfilment, a family-run 3PL in West Yorkshire that dispatches around 850,000 orders a year for more than 140 brands.
KPIs and SLAs: what is the difference?
A KPI is a measure. Order accuracy, dispatch on time and stock accuracy are all KPIs. They tell you how the operation is performing.
An SLA is an agreement. It takes the KPIs that matter most, sets a target for each, defines exactly how each is measured and reported, and says what happens if a target is missed. Without an SLA, KPIs are just numbers. Without good KPIs, an SLA is just words.
Most fulfilment contracts include an SLA as a schedule to the main terms. Whether you are signing your first 3PL contract or reviewing an existing one, it is worth reading that schedule as carefully as the price list.
The 3PL KPIs that matter most
There are dozens of warehouse metrics, but a handful tell you almost everything you need to know about an eCommerce fulfilment operation.
Order accuracy
Order accuracy is the share of orders sent with the right items in the right quantities. It is the KPI customers feel most directly, because a wrong item means a complaint, a return and often a lost customer.
Measure it as orders sent correctly divided by total orders sent, usually based on errors reported by customers and confirmed by the 3PL. Barcode-verified picking should keep accuracy very high; at Ogden Fulfilment, order accuracy runs at 99% or above.
Dispatch on time
Dispatch on time is the share of orders dispatched by the agreed deadline. The deadline should be defined precisely, for example: orders received before 1pm on a working day are dispatched the same day.
This KPI measures what the warehouse controls. Delivery speed after the parcel leaves depends on the courier, so keep dispatch and delivery as separate measures. Agree how weekends and bank holidays are treated. At Ogden, orders received before 1pm on weekdays and 11:30am at weekends are dispatched the same day, seven days a week.
Stock accuracy
Stock accuracy measures how closely the stock figures in the system match what is physically on the shelf. Poor stock accuracy causes overselling, cancelled orders and missed sales, especially if you sell across several channels from one pool of stock.
It is usually measured through regular cycle counts, comparing counted quantities with system quantities for a sample of SKUs. Agree how often counts happen, how differences are investigated and who bears the cost of genuine losses.
Receiving time (dock to stock)
Receiving time measures how quickly new deliveries are unloaded, counted, checked and made available to sell. If a container of new stock sits on the dock for a week, you lose a week of sales.
Define it in working hours or days from arrival on site to stock being available, and agree what the 3PL needs from you to hit it, such as advance notice of deliveries and correctly labelled cartons.
Returns processing time
Returns processing time measures how quickly returned items are received, inspected, graded and either restocked or set aside. Fast processing gets resaleable stock back on sale and lets you refund customers promptly. Our guide to returns management for eCommerce covers this in more detail.
Damage rate
Damage rate tracks orders that arrive damaged because of how they were packed. It overlaps with courier performance, so agree how damage claims are investigated and when packaging, rather than handling in transit, is judged to be the cause.
Response and resolution times
How quickly does your account manager reply to a query, and how quickly are problems actually fixed? Response times are easy to measure and say a lot about the relationship. Set separate targets for urgent issues, such as a stuck integration or a missed collection, and routine queries.
Invoice accuracy
Billing errors erode trust quickly. Track how often invoices need correcting, and make sure every charge on an invoice can be traced back to the rate card in your contract.
Measures that depend on more than the warehouse
Some measures matter to your customers but are only partly in your 3PL’s hands. Delivery on time depends on the courier once a parcel is collected. Customer satisfaction scores depend on your product, your website and your customer service as well as on fulfilment.
Track these, but do not build them into an SLA as if the warehouse alone controls them. A good 3PL will still help: choosing the right courier services, monitoring tracking data and raising problems with carriers on your behalf. Our automatic shipping tracking pushes tracking numbers back to your store so you and your customers can see where every parcel is.
What belongs in a fulfilment SLA
A strong SLA is specific. For each KPI it should say what is measured, how, how often and what the target is. It should also cover the following.
Definitions
Define every term that affects a measure. What counts as an order received? What time is the cut-off, and in which time zone? Is an order with one wrong item out of five counted as one error or as a failed order? Vague definitions are where most SLA disputes start.
Reporting
Agree how often performance is reported, in what format and who receives it. Monthly reporting is common, with live dashboards for day-to-day monitoring. You can see how we report on stock, dispatch and returns on our stock control, returns and reporting page.
Exclusions
A fair SLA recognises events outside the 3PL’s control, such as courier failures after collection, severe weather, stock arriving late or unlabelled, or a sudden spike far beyond the forecast you supplied. Make sure exclusions are listed and limited, not so broad that the SLA means nothing.
Your obligations
Your 3PL can only hit its targets if you do your part. Expect the SLA to set out what you must provide: accurate product data, advance notice of inbound deliveries, sales forecasts before peak and promotions, and correctly labelled stock. If you plan a big promotion without telling your provider, you cannot reasonably expect same-day dispatch on every order.
Remedies and service credits
What happens when a target is missed? Some contracts offer service credits, a reduction in fees when performance falls below an agreed level. Others rely on a corrective action plan with a deadline. Whatever the approach, it should be proportionate and focused on fixing the problem rather than punishing one bad week.
Liability and insurance
Check how liability for lost or damaged stock is calculated, whether it is capped and what insurance covers your stock while it is in the warehouse. Make sure the value used for claims reflects what the stock is actually worth to you.
Review and escalation
Agree regular review meetings, monthly or quarterly, and a clear escalation route for when problems are not being fixed. The best SLAs are used as a shared tool for improvement, not only as evidence in a dispute.
Notice and exit
Finally, check the notice period, any minimum term and how your stock and data will be released if you leave. You may never need these clauses, but they decide how much control you have if things go wrong. Our guide on how to switch fulfilment provider explains why these terms matter so much in practice.
Setting realistic targets
Targets should be ambitious but achievable, and they should reflect your business. A brand selling single, small items has a simpler operation than one shipping multi-item orders with personalised inserts, and its targets can be tighter.
Some practical rules:
- Base targets on measured performance, not on marketing claims. Ask a prospective provider for real figures from comparable clients.
- Agree how targets change at peak. If order volumes double in November and December, decide in advance whether dispatch targets stay the same, and what forecasting you must provide to make that possible. Our peak season fulfilment guide covers peak planning in detail.
- Allow a settling-in period for a new provider, typically the first few weeks, before targets are enforced strictly.
- Review targets at least once a year as your range, channels and volumes change.
Using KPIs to manage the relationship
KPIs are most useful when both sides look at them together and act on them. A monthly review that goes through each measure, looks at the causes of any misses and agrees actions will do more for your service than any penalty clause.
Look for trends rather than single bad days. A slow decline in stock accuracy, or response times creeping up month after month, is an early warning that something needs attention. Raise it early, while it is still easy to fix.
If problems keep recurring despite agreed actions, that is the point to review the relationship. Our guide to choosing a UK fulfilment company sets out what to look for if you decide to move.
How Ogden Fulfilment reports performance
At Ogden Fulfilment, performance reporting is part of the service, not an extra. Our 3PL services include:
- Barcode-verified picking, with order accuracy running at 99% or above.
- Same-day dispatch for orders received before 1pm on weekdays and 11:30am at weekends, seven days a week.
- Live stock levels and order status visible from your own dashboard.
- Monthly and on-demand reporting on order volumes, dispatch performance, stock levels and returns.
- Itemised invoices, no long-term contracts and no minimum order volumes.
Frequently asked questions
What are the most important KPIs for a 3PL?
For eCommerce fulfilment, the most important KPIs are order accuracy, dispatch on time, stock accuracy, receiving time and returns processing time. Response times and invoice accuracy are also useful measures of the relationship.
What is a good order accuracy rate for a 3PL?
Well-run fulfilment operations using barcode-verified picking typically report order accuracy of 99% or above. Agree exactly how accuracy is measured, as different definitions can produce very different figures.
What should a fulfilment SLA include?
A fulfilment SLA should define each KPI, its target and how it is measured, how performance is reported, any exclusions, your own obligations, remedies when targets are missed, liability and insurance, review meetings and escalation routes.
Should delivery times be part of a 3PL SLA?
Dispatch times should be, because the warehouse controls them. Delivery times after collection depend mainly on the courier, so they are usually tracked separately rather than included as a 3PL target.
Are service credits common in fulfilment contracts?
Some fulfilment contracts include service credits, which reduce fees when performance falls below an agreed level. Others rely on corrective action plans. Either can work, provided the approach is clear and proportionate.
Talk to us about service levels
If you are reviewing your current provider’s performance, or want to know what Ogden would commit to for your orders, contact our team for a no-obligation conversation, or call 0330 058 5621.
