The verdict in three sentences
In 2026, an application maintenance retainer costs between 80 and 400 EUR/month depending on the SLA and included hours. The contract covers security updates, backups, bug fixes and a few minor enhancements — not redesigns or major new features. Skipping maintenance costs more in the long run: hacks, a site broken after an update, or data lost for want of a backup.
Maintenance cost by service level
Here are typical 2026 tiers for a business website, from lightest to most complete.
| Level | Price EUR/month | Annual price | Hours included | Target |
|---|---|---|---|---|
| Essential | 80 EUR | 960 EUR | 1 h/month | Simple brochure |
| Standard | 150 EUR | 1,800 EUR | 3 h/month | Brochure + blog |
| Business | 280 EUR | 3,360 EUR | 5 h/month | E-commerce |
| Premium | 400 EUR | 4,800 EUR | 8 h/month + SLA | Institutional |
| Ad hoc (no contract) | 45 EUR/hour | pay-as-you-go | on demand | One-off fixes |
The ad-hoc rate (around 45 EUR/hour) is more expensive overall and carries no response-time guarantee: an annual contract is cheaper as soon as you expect regular updates.
What a maintenance retainer includes and excludes
The classic misunderstanding is assuming maintenance covers everything. Here is the usual boundary.
| Service | Included in retainer | Billed separately |
|---|---|---|
| Security updates (CMS, plugins) | Yes | — |
| Automated backups + restore | Yes | — |
| Fixing existing bugs | Yes | — |
| Small content edits | Yes (within quota) | Beyond quota |
| Uptime monitoring | Yes (Standard+) | — |
| New page / new feature | No | On quote |
| Visual redesign | No | Separate project |
| Hosting | Sometimes bundled | 100-400 EUR/year |
Insist on a monthly report listing applied updates and time consumed: it is proof the contract is actually being delivered.
Mini case study
Anna, director of a private clinic, hesitates over a maintenance plan. Her site crashes on a Sunday after a botched CMS update: with no contract, the emergency fix costs 150 EUR and the site stays down for 2 days, during which she estimates losing around ten online bookings. Moving to a Standard retainer at 150 EUR/month, she gets daily backups, restore in under 2 hours and security monitoring. Over the year she secures her booking channel for 1,800 EUR, versus recurring and costly outages.
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FAQ
Is maintenance really mandatory?
Nothing legally requires it, but an unmaintained site degrades: security holes, breakage after browser updates, data loss. The cost of one outage quickly exceeds a year of retainer.
What's the difference between maintenance and hosting?
Hosting (100-400 EUR/year) is the server that runs the site. Maintenance is the human work of updating, fixing and backing up. The two are sometimes bundled, often separate.
What exactly do the included hours cover?
They fund small edits (change a text, add a news item, swap a photo). A new feature or page falls outside the quota and gets its own quote.
Can I cancel easily?
Contracts are usually monthly or annual with one month's notice. Confirm your credentials (domain, hosting, code) remain yours if you leave.
What is an SLA and do I need one?
An SLA guarantees a response time (e.g. restore within 4 h) and uptime (e.g. 99.9%). Useful for a critical site like e-commerce or a clinic; overkill for a small brochure.
Let's scope your project. Tell us your site type and availability requirement, and we will propose the right retainer tier and annual budget. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
