Clients want to know when they'll hear back and what happens if you're late. Here's how a service level agreement handles both, with an agency example.
Definition
A service level agreement (SLA) is a written agreement between a provider and a client that sets the response times, turnaround, and quality the client can expect, and what happens if those promises are missed.
Why it matters
An SLA turns "we're always available" into a promise the client can check. Clients stop guessing when they'll hear back, and your team stops answering to whoever emails loudest.
Here's the concrete cost of skipping one. Without a response time agreement, a client who emails twice in a day assumes they're being ignored. Your team then drops real work to chase and reassure, and the second email becomes the thing everyone remembers. One line saying "first reply within one business day" would have settled it.
An SLA is also a planning tool. Once you've promised a turnaround, you can count how many requests you can take on before you break it. That's the math behind growing without hiring another account manager. Fast first replies are the hardest promise to keep by hand, so some teams give that job to an AI account manager that acknowledges requests and asks for missing details.
Remedies matter too. CIO describes an SLA as defining the service expected from a vendor, the metrics it's measured by, and the remedies if service falls short. For an agency, a remedy can be small, like a priority slot on the next request. Trust survives a miss when the fix was agreed in advance.
The idea isn't only for IT contracts. An SLA for agencies is a service promise: how fast you reply, how long standard work takes, and how much quality control is built in. It works best when clients can see it, for instance in a branded portal that shows where each request stands.
How it works
An SLA works by naming a few measurable targets, saying who owes what, and agreeing on a consequence for a miss. Wikipedia notes that SLAs often include service-level objectives such as uptime, mean time to repair, and first-call resolution. Those are examples, not a required list. For client work, the metrics are usually simpler.
Most SLAs have these parts:
| Component | What it says | Agency example |
|---|---|---|
| Service description | What's covered | Logo, social, and web design requests |
| Metrics | Measurable targets | First reply in 1 business day, standard turnaround in 3 |
| Exclusions | What isn't covered | Brand overhauls, rush work, new channels |
| Client responsibilities | What you need from them | Complete briefs, feedback within 5 business days |
| Remedies | What happens on a miss | Priority slot on the next request |
| Review | When it gets revisited | Every quarter |
An illustrative SLA for a design studio
This is an example, not a recommendation. Your numbers should come from your own capacity.
- First response within 1 business day
- Standard request turnaround of 3 business days
- Two feedback rounds included
- Client feedback within 5 business days
- If the studio misses turnaround, the client's next request goes to the front of the queue
Notice that the client has obligations too. A turnaround promise only holds if the brief is complete and feedback arrives on time. You can turn client emails into requests so replies are logged from the first message, and use client approvals with auto-approval so a silent client doesn't stall the clock forever.
Writing a client SLA in four steps
- List what you do and what's out of scope. Write down the services the SLA covers and the ones it doesn't.
- Pick two or three measurable targets. First response time and standard turnaround are enough to start.
- Spell out what you need from the client. Timely feedback and complete briefs belong in the document.
- Decide what happens on a miss, then set a review date. A quarterly check keeps the numbers honest.
Resist the urge to write ten metrics with penalty clauses. A long SLA you can't measure is another document nobody reads, and it invites disputes instead of preventing them. Two or three promises you can track beat a dozen you can't.
How to set the numbers
For 30 days, record the time from each client request arriving to your first reply, and from request to delivery. Compare those actuals to the targets you're thinking of promising. Set the SLA at a level you hit most of the time, then recheck after a quarter. Weekly client summaries are a handy way to report against it without writing updates by hand.
Types and legal weight
SLAs usually come in three flavors. A customer-based SLA is tailored to one client. A service-based SLA covers one service offered the same way to many customers, as AWS describes it. A multi-level SLA layers several of these together.
Is it legally binding? Often, yes, because an SLA is typically a binding contract. Enforceability depends on jurisdiction and wording, though, and internal SLAs are usually operational rather than enforceable. If you want yours to carry legal weight, ask a lawyer. Template sites like SLA Template offer downloads in PDF and Word, but a template isn't legal advice.
Related terms
- Client portal: the place where a client sees status against the promised turnaround, so they don't have to ask.
- Service-level objective (SLO): the target for a metric, such as "reply within one business day."
- Service-level indicator (SLI): the metric you actually measure, such as the real time to first reply.
- Operational-level agreement (OLA): an internal agreement between teams that helps you meet the SLA, like design agreeing to review copy within a day.
- Scope of work: defines what's covered, which tells the SLA what it applies to.
- Change request: the route for work outside scope, so extra asks don't quietly eat your turnaround promise.
Often confused with
Service level agreement (SLA) vs operational-level agreement (OLA)
An SLA is client-facing: it's the promise your client can see. An OLA is between your own teams, like account management and design, and it exists so the SLA can be kept. ConnectWise draws the same line between an external client-facing SLA and internal agreements.
An SLA also isn't the same as a full contract or scope of work. It's the service-level part: how fast and how well. The contract covers fees, ownership, and terms, and the scope covers what you're building.
Frequently asked questions
What should be included in a service level agreement?
Start with a service description, then measurable targets like response and turnaround time. Add exclusions, what you need from the client, what happens if a target is missed, and a review date. IBM describes an SLA as a contract that outlines the terms and expectations of the service.
Is an SLA legally binding?
Often it is, as a contract, but it depends on jurisdiction and wording. Internal SLAs between departments are usually operational, not enforceable. Check with legal counsel before relying on one.
Does a small agency or freelancer need an SLA?
A light one-page version helps. Write two or three promises on response time and turnaround, plus what you need from the client. Want every client to see where their requests stand and how long the work took? Try Dora free. Your first client is free, forever.
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