Service level agreement (SLA): Definition, Examples and How It Works

What is a service level agreement? A service level agreement (SLA) is the part of a contract where a service provider commits to measurable standards, such as how fast it will respond, how quickly it will fix problems or how much uptime it guarantees, and says what the customer gets if those standards are missed.

Key takeaways

• An SLA sets targets you can measure: response time, fix time, uptime, hours of cover.
• It also says how those targets are measured and what happens when they are missed, usually service credits.
• Small businesses meet SLAs from both sides: the ones in their suppliers’ terms, and the ones they offer their own clients.
• Only promise what you can hit on your worst week, not your best.

Why a service level agreement matters for a small business

Picture a three-person IT support firm in Lagos looking after twelve small offices. Without an SLA, every client has a different idea of “urgent”. One expects a technician within the hour for a broken printer; another waits two days to mention the server is down.

An SLA settles this before work starts. The client knows what a “critical” problem is and how fast you will act on it. You know what you have promised, so you can staff for it and price it.

You are also on the receiving end of SLAs. Google’s Workspace SLA (checked on 1 October 2026) commits to at least 99.9% monthly uptime and adds 3, 7 or 15 days of free service when uptime falls below set levels. Knowing how your email, hosting and payment providers word theirs tells you what you can safely promise your own clients.

How a service level agreement works

NIST’s glossary entry for service level agreement (checked on 1 October 2026) describes it as a commitment between a provider and its customers covering responsibilities, the type of service, expected performance such as reliability and response times, and how reporting, resolution and termination work. In practice, most SLAs have the same building blocks:

Part	What it says	Example for an IT support firm
Scope	Which services the SLA covers	Help desk, laptops, office network
Hours of cover	When the clock runs	Monday to Friday, 8am to 6pm WAT
Priority levels	How problems are graded	Critical, high, normal
Response time	Time to first human reply	Critical: 30 minutes
Resolution target	Time to fix or a workaround	Critical: 4 business hours
Measurement	How it is counted and reported	Monthly report from the ticket log
Remedies	What happens if targets are missed	Service credit of 5% of the monthly fee
Exclusions	What the SLA doesn’t cover	Outages caused by the client’s power or ISP

The SLA usually sits inside a wider service agreement or alongside a statement of work, which lists the deliverables themselves. Our service agreement template covers the rest of the contract around it.

Example: an IT support SLA with numbers

These figures are illustrative. The Lagos firm charges an office ₦400,000 a month for managed support and offers this SLA during business hours:

Priority	Example	First response	Fix or workaround
Critical	Whole office offline	30 minutes	4 business hours
High	One person can’t work	2 business hours	1 business day
Normal	Request or minor fault	1 business day	5 business days

In March, the office logs 40 tickets. 38 get a first response within target, so the response target is met 95% of the time. The contract promises 95% or better, so no credit is due. If only 34 had been on time (85%), a 5% service credit would take ₦20,000 off April’s invoice.

That is why the measurement row matters as much as the targets.

Common mistakes with service level agreements

• Promising 24/7 when you are a small team. Say business hours, and offer out-of-hours cover as a paid extra.
• Vague words. “Prompt” and “as soon as possible” can’t be measured. Use minutes and hours.
• No priority levels. If every ticket is urgent, none is.
• No exclusions. You can’t control the client’s power supply or internet provider, so say so.
• Not measuring. If you can’t produce the monthly numbers, the SLA is just a hope. Check your tools can track first responses before you sign.

This is general information, not legal advice. Have a lawyer check any contract you sign.

Related terms

A statement of work describes what will be delivered; the SLA describes how well and how fast. Deliverables are the outputs the client receives. Canned responses help a team hit response targets on repeat questions without cutting quality. Our customer service guide sets out response time standards by channel if you want a starting point.

How startbuddi handles service level agreements

You can write the SLA in Documents: start from a contract template such as Service Agreement or Monthly Retainer Agreement, add the SLA table, and use variables for the client’s name and fee. Send it for signature with startbuddi eSign, and the signed copy stays linked to the client and the project.

For the measuring side, Customers Reports includes a Lead response time figure: the median time between a customer’s first message and your team’s first reply, counting team replies only. Website chat lets you set a maximum wait and alerts the team when a visitor is still waiting or the response time is missed. startbuddi doesn’t run per-client SLA timers or calculate service credits, so keep that report in a sheet. See pricing for plans; a free plan is available.