Website maintenance contract : what it covers in London (2026)

The verdict in three sentences

A website maintenance contract protects your B2B site against outages, vulnerabilities and obsolescence, for GBP 150 to 900/month depending on scope. The retainer covers fixes, security updates, backups and a restore SLA of 4 to 24 hours; everything else (new pages, features, redesign) shifts to out-of-scope work at GBP 80-140/hour. Before signing, check three lines: the hours actually included, the guaranteed response time, and the exit (reversibility) clause that returns your access and backups if the relationship ends.

The three standard maintenance tiers in 2026

In London as across the UK, agencies structure maintenance in three tiers. 2026 order of magnitude for a corporate WordPress/Next.js site:

Unused hours are rarely rolled over: read the clause. A good contract also caps the out-of-scope hourly rate at GBP 80-140/hour and clearly separates corrective maintenance (included) from evolutive work (billed).

What the retainer really covers

The standard scope of a B2B maintenance contract in 2026 includes:

Beware of contracts that exclude backups or monitoring: an outage detected 48 hours too late can cost far more than the annual retainer.

Mini case study

Mark, director of a 40-employee industrial SME in East London, runs a corporate site with a technical catalogue and a quote-request form. He is weighing "no maintenance" against the Business tier at GBP 450/month.

Without a contract, a vulnerability in an un-updated plugin causes a defacement: 3 days of downtime, emergency work at GBP 130/hour over 12 hours (GBP 1,560), plus an estimated loss of 6 quote requests at a GBP 8,000 average deal. With the Business tier (GBP 5,400/year), monthly updates would have blocked the flaw and the 8-hour SLA would have contained the incident. Clear ROI: the contract costs less than a single avoided incident.

FAQ

What annual budget should I plan for B2B maintenance in 2026?

Expect GBP 1,800 to 10,800/year depending on tier (GBP 150 to 900/month). A standard B2B site sits around GBP 4,500-6,500/year, hosting included or separate.

What is the usual commitment length?

The norm is a 12-month commitment, renewable, with 1 to 3 months' notice. Some providers offer monthly no-commitment plans but 15-25 % more expensive.

What about unplanned changes?

They fall outside the retainer and are billed as out-of-scope work at GBP 80-140/hour, on an approved quote. Demand a written hourly cap and a response deadline for requests.

What exactly is reversibility?

It is the clause guaranteeing that at contract end the provider returns your source code, access, databases and backups within 15 days, without holding your site hostage. Non-negotiable in B2B.

Does a 4-hour SLA really cost more?

Yes: a 4-hour 24/7 SLA requires on-call staffing, adding GBP 200-400/month over a 24-business-hour SLA. Only pay for it if your site generates revenue around the clock.

Let's scope your project. Tell us about your site, its critical scope and the SLA you want: we will frame a maintenance retainer with included hours and a clear exit clause. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.