Website maintenance cost in the UK is where a lot of money quietly leaks — either because nothing is being maintained and the site rots until it breaks, or because a retainer is being paid for a monthly report and not much else. The right figure depends entirely on what the site is: a brochure site and a web application need very different care.
This guide sets out realistic 2026 GBP bands for website and software maintenance in the UK, and, just as importantly, what each band should actually deliver. We run maintenance as a retainer with a named senior engineer who knows your codebase and a real SLA — not a help desk handing your ticket to whoever is free — so our framing assumes maintenance that genuinely reduces risk over time rather than just holding the line.
The bands below are monthly figures in GBP. The principle that runs through all of them: maintenance you cannot see the value of is maintenance you are overpaying for. A good retainer shows you what shipped, what is at risk, and how the system is getting healthier — and lets you walk away with your code and documentation if it is not.
| Engagement | Range | What's included |
|---|---|---|
| Brochure-site care | £100–£400 / month | Hosting oversight, CMS and plugin updates, security patches, backups and small content tweaks for a marketing or brochure site. Light-touch but enough to stop a simple site quietly breaking. |
| Business-site / CMS retainer | £400–£1,500 / month | Active maintenance for a content-rich business site: updates, monitoring, performance and SEO upkeep, accessibility fixes and a budget of hours for small changes each month. |
| Web-application support retainer | £1,500–£4,000 / month | A named senior engineer on a real application: SLA-backed bug fixes by severity, dependency and security upgrades, monitoring, performance work and small features within a monthly allocation. |
| Platform / multi-system support | £4,000+ / month | Comprehensive support for a substantial platform or several systems: tighter SLAs, more allocated hours, proactive tech-debt reduction and a quarterly roadmap review. Scaled to the size of what is being run. |
Brochure-site care
£100–£400 / month
Hosting oversight, CMS and plugin updates, security patches, backups and small content tweaks for a marketing or brochure site. Light-touch but enough to stop a simple site quietly breaking.
Business-site / CMS retainer
£400–£1,500 / month
Active maintenance for a content-rich business site: updates, monitoring, performance and SEO upkeep, accessibility fixes and a budget of hours for small changes each month.
Web-application support retainer
£1,500–£4,000 / month
A named senior engineer on a real application: SLA-backed bug fixes by severity, dependency and security upgrades, monitoring, performance work and small features within a monthly allocation.
Platform / multi-system support
£4,000+ / month
Comprehensive support for a substantial platform or several systems: tighter SLAs, more allocated hours, proactive tech-debt reduction and a quarterly roadmap review. Scaled to the size of what is being run.
A brochure site needs updates and patches; a web application needs an engineer who can read the code and fix root causes. The gap between those two is the single biggest driver of the maintenance figure, so the first question is always what is really being maintained.
A defined response time by severity — same-business-day for production-down, a clear window for normal bugs — costs more than best-effort support, because it reserves senior capacity for you. It is worth it when downtime actually costs you money or customers.
A named senior engineer who learns your system fixes root causes; a rotating first-line queue treats symptoms. The cheaper option often costs more over a year in repeated, half-fixed issues, so seniority is usually the better value, not the indulgence.
A good retainer includes a monthly allocation of hours for small features and improvements, not just firefighting. That allocation is part of why the retainer earns its place — it keeps the backlog moving instead of letting small needs pile into a costly project.
Error and uptime monitoring, dependency hygiene and a quarterly roadmap review turn maintenance from reactive to proactive, steadily reducing risk. Without them you pay for incident response instead of incident prevention, which is the more expensive way round.
Senior engineers on retainer, not on a ticket queue.
We'll send back an itemised proposal in GBP — scope, line items, timeline, and the team that would run it.
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