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saas service level agreement uk

SLA for UK SaaS

A saas service level agreement uk sets out exactly what uptime, support response times, and remedies your customers can expect from your platform. Without one, you are exposed to open-ended liability every time your service goes down or underperforms. UK SaaS founders often bolt on a generic SLA from a US template or bury vague commitments inside their terms of service — neither approach holds up when a customer demands a credit or threatens to terminate. A properly drafted SLA defines your service tiers, measurement windows, exclusions (planned maintenance, third-party outages), and credit calculation in plain terms. It also needs to sit consistently alongside your main subscription agreement and data processing addendum. Atornee lets you draft, review, and iterate on your SLA using AI trained on UK contract practice, so you get a document that reflects what you actually deliver — not a wishlist that creates obligations you cannot meet. If your SLA involves enterprise customers or bespoke uptime guarantees above 99.9%, escalate to a solicitor.

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Why this matters

Most UK SaaS founders either skip a standalone SLA entirely or copy one that does not reflect how their infrastructure actually works. The result is a mismatch between what customers think they are buying and what you can realistically deliver. When an outage hits, that gap becomes a dispute. Customers cite your marketing copy, you have no defined remedy cap, and you end up issuing ad hoc credits just to keep the relationship alive. A poorly scoped SLA also creates problems at due diligence — investors and enterprise procurement teams will flag missing or inconsistent service commitments immediately. Getting this document right before you scale matters.

The Atornee approach

Atornee is not a template library. When you draft an SLA through Atornee, the AI asks you about your actual infrastructure setup, support team capacity, and customer tier structure before generating a draft. It flags clauses that create unrealistic obligations, checks consistency with your existing subscription terms, and explains every section in plain English so you understand what you are committing to. You can iterate in real time without waiting for a solicitor's availability. For standard SaaS arrangements — fixed uptime tiers, standard credit remedies, B2B customers — Atornee covers the full drafting workflow. For bespoke enterprise SLAs with negotiated targets, a solicitor review is worth the cost.

What you get

A UK-specific SLA draft tailored to your actual uptime commitments, support tiers, and customer type — not a generic US template
Clear service credit calculation clauses with defined measurement windows and exclusions that limit your liability exposure
Consistency checks against your existing subscription agreement and data processing addendum to avoid contradictory obligations
Plain-English explanations of every clause so you can negotiate with customers from a position of understanding
Flagged risk areas where your current service delivery may not support the commitments you are about to make

Before you sign checklist

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1. Document your actual uptime figures for the past 12 months before drafting — your SLA commitments must reflect reality, not aspiration
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2. Decide which customer tiers will receive different SLA terms and what support response times you can genuinely staff
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3. Identify your third-party infrastructure dependencies (cloud providers, payment processors) so you can draft appropriate exclusions
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4. Check your existing subscription agreement for any service level references that your new SLA must align with
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5. Define your credit remedy structure — percentage of monthly fee, maximum cap, and how customers claim — before you open the drafting tool
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6. Use Atornee to generate and review your SLA draft, iterating on any clauses flagged as high-risk or inconsistent
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7. If any enterprise customer requests uptime guarantees above 99.9% or custom penalty structures, involve a solicitor before signing

FAQ

Is a SaaS SLA legally required in the UK?

No, there is no statutory requirement to have a standalone SLA. But without one, your service obligations default to implied terms under the Supply of Goods and Services Act 1982 and the Consumer Rights Act 2015 (for consumer-facing services), which give you far less control over what 'reasonable' performance means. For B2B SaaS, a written SLA is the practical standard and is expected by enterprise customers and investors.

What uptime percentage should I commit to in a UK SaaS SLA?

That depends entirely on your infrastructure. Common tiers are 99.5%, 99.9%, and 99.95% monthly uptime. Do not commit to a figure higher than your actual historical performance supports. 99.9% monthly uptime allows roughly 43 minutes of downtime per month — that sounds generous until you have a deployment issue. Calculate your real numbers first, then set your SLA target slightly below your average to give yourself a buffer.

Can I limit my liability through the SLA?

Yes, and you should. Your SLA should specify that service credits are the sole and exclusive remedy for service failures, and cap total credits at a percentage of the monthly fee (commonly 10–30%). Under the Unfair Contract Terms Act 1977 and the Consumer Rights Act 2015, exclusion clauses must be reasonable and clearly communicated. For B2B contracts, courts apply a reasonableness test — so your cap needs to be proportionate to the contract value.

Does my SLA need to cover data protection obligations?

Your SLA covers service performance. Data protection obligations — including breach notification timescales and processor responsibilities under UK GDPR — belong in a separate Data Processing Agreement (DPA). The two documents should cross-reference each other but keep their obligations distinct. Mixing them creates ambiguity about which terms govern in a dispute.

What happens if I cannot meet my SLA commitments?

If your SLA is well-drafted, the customer's remedy is limited to the service credits you have defined. If it is not, they may argue for damages, termination for material breach, or both. This is why the exclusions section matters — planned maintenance windows, force majeure events, and third-party outages outside your control should all be carved out of your uptime calculation.

When should I get a solicitor to review my SaaS SLA rather than using AI?

Use a solicitor when: an enterprise customer is negotiating bespoke uptime targets or penalty structures; your SLA forms part of a contract worth more than £50,000 annually; you are dealing with regulated sectors like financial services or healthcare where service failures carry regulatory consequences; or a customer's legal team has sent you a heavily redlined version. For standard SaaS arrangements with SME customers, AI-assisted drafting through Atornee is a proportionate starting point.

Related Atornee Guides

Cheap Contract Solicitor Alternative (UK)

Understand when AI drafting is sufficient versus when a solicitor adds value for your contract workflow.

Cheap Solicitor for NDA (UK)

If your SLA is shared during sales conversations, pair it with an NDA to protect confidential service architecture details.

Atornee Use Cases

See how UK SaaS founders use Atornee across their full contract stack, from subscription agreements to DPAs.

External References

GOV.UK Business and Self-employed

Official UK guidance on business contracts and commercial obligations.

UK Legislation

Primary source for the Supply of Goods and Services Act 1982, Unfair Contract Terms Act 1977, and Consumer Rights Act 2015 — all relevant to SLA enforceability.

ICO Guidance for Organisations

UK data protection authority guidance — essential when your SLA sits alongside a Data Processing Agreement under UK GDPR.

Trust & Verification Policy

Authored By

A

Atornee Editorial Team

UK SaaS Contract Research

Reviewed By

C

Compliance Review Desk

UK Business Legal Content QA

Last reviewed on 3/4/2026

"This content is based on analysis of common SLA structures used by UK SaaS businesses and the statutory framework governing B2B service contracts in England and Wales. It reflects practical drafting considerations drawn from real commercial contract patterns, not theoretical legal commentary."

References & Sources