Budget 15% to 25% of your original build cost every year for mobile app maintenance and support. A £60,000 app therefore costs roughly £9,000 to £15,000 a year to keep running, secure and compliant. That figure covers backend hosting (£6,000 to £24,000 a year for higher-traffic apps), security patching (£2,000 to £5,000), bug fixes (£3,000 to £8,000), iOS and Android compatibility updates, and fixed platform fees: Apple charges £99 a year for its Developer Programme and Google charges a one-off £25 to publish. Apps handling payments or health data add £10,000 to £30,000 a year for UK GDPR, PCI-DSS and accessibility compliance. Maintenance is not optional. Skip it and Apple or Google can delist your app, security holes go unpatched, and an OS update can break your app overnight. This guide gives UK business owners a full line-item budget, a worked example and a checklist.
Last updated: June 2026
A mobile app needs ongoing maintenance because the ground it stands on never stops moving. Unlike a printed brochure, your app sits on top of operating systems, devices, app stores, servers and third-party services that all change without asking your permission. Apple ships a new major version of iOS every September. Google does the same with Android. Each release can deprecate an API your app depends on, tighten a privacy rule, or change how a permission dialog behaves. If you do nothing, your app does not stay still: it slowly drifts out of compatibility until something visible breaks for your users.
There is a persistent myth among UK business owners that an app is a one-off capital purchase, like buying a van. You pay the build cost, you take delivery, and that is the end of the spending. The reality is closer to owning a commercial vehicle that must pass an annual MOT, get serviced, and stay taxed and insured to remain legally on the road. The build is the deposit. Maintenance is the cost of ownership, and it runs for as long as the app is live.
Several forces make this unavoidable:
Our honest view: any agency that sells you an app and implies it will run untouched for years is either inexperienced or hoping you will not notice the slow decline. A well-built app is a living system. Budget for it as one from day one, and you avoid the panic spend that comes when something breaks and you have no maintenance arrangement in place.
Budget 15% to 25% of your original build cost per year. This is the single most reliable rule of thumb in the industry, and it holds up across simple apps and complex ones. The percentage rises with complexity, user volume, the number of integrations, and how sensitive your data is. A simple content app sits at the bottom of the range. A fintech or healthcare app with payments and personal data sits at the top, or beyond it.
Here is what that means in plain numbers for typical UK build budgets:
| Original build cost | Annual maintenance at 15% | Annual maintenance at 25% | Typical use case |
|---|---|---|---|
| £30,000 | £4,500 | £7,500 | Simple content or booking app |
| £50,000 | £7,500 | £12,500 | Standard business app with logins |
| £60,000 | £9,000 | £15,000 | App with integrations and dashboards |
| £80,000 | £12,000 | £20,000 | Multi-feature app, high traffic |
| £120,000 | £18,000 | £30,000+ | Fintech or healthcare, compliance-heavy |
Why the wide band? Because maintenance is not a single fixed line. It is a stack of separate costs that each scale differently. Hosting scales with how many users you have and how much data they move. Security scales with how sensitive your data is. Feature development scales with how ambitious your roadmap is. A quiet internal tool used by 40 staff is cheap to maintain. A consumer app with 50,000 monthly users, live payments and three integrations is not.
The factors that push you toward the top of the range, or above it:
Be sceptical of any quote that gives you a single flat annual number with no breakdown. The honest rule: a credible maintenance budget shows you the line items, not just the total.
You are paying for six core line items: backend infrastructure and hosting, security patching, bug fixing, OS and device compatibility updates, third-party licence and API fees, and app store compliance work. On top of those sit fixed platform fees and, for many businesses, active feature development. Understanding each line is what separates a defensible budget from a guess.
Here is the full breakdown with typical UK annual ranges:
| Line item | Typical annual UK cost | What it covers |
|---|---|---|
| Backend infrastructure and hosting | £6,000 to £24,000 | Cloud servers, databases, storage, bandwidth, scaling, uptime monitoring |
| Security patching | £2,000 to £5,000 | Library updates, vulnerability fixes, penetration testing, certificate renewals |
| Bug fixes | £3,000 to £8,000 | Diagnosing and resolving crashes, defects and user-reported issues |
| OS and device compatibility | £3,000 to £7,000 | Updating for new iOS and Android versions and new device models |
| Third-party licences and APIs | £1,000 to £6,000 | Payment gateways, maps, push notifications, analytics, SMS, email |
| App store compliance | £1,000 to £3,000 | Meeting new Apple and Google policy requirements to stay published |
| Active feature development | £15,000 to £40,000 | Optional: new features, improvements, A/B tests (only if roadmap is active) |
The biggest variable is backend hosting. A simple app serving a few thousand users a month might run on £500 a month of cloud infrastructure. A high-traffic consumer app with media, real-time features and heavy database use can comfortably hit £2,000 a month. This is the line that catches people out, because it grows quietly with success: the more popular your app becomes, the more it costs to host.
Security is the line you must never trim. Cutting your hosting tier to save money is a business decision. Cutting security patching is a gamble with your users' data and your reputation under UK GDPR. Treat the £2,000 to £5,000 security band as a floor, not a target, especially if you handle any personal data. For data-sensitive apps, robust ongoing security work is part of any serious mobile app development engagement, not an optional add-on.
Active feature development deserves a clear distinction. Pure maintenance keeps the app working as built. Feature development makes the app better than it was. Many businesses blur the two and then feel ambushed by the cost. Our advice: keep them as separate lines in your budget. Maintenance is the non-negotiable baseline. Feature development is an investment decision you make consciously, quarter by quarter.
There are five recognised types of mobile app maintenance: corrective, adaptive, perfective, preventive and emergency support. A complete maintenance contract should cover all five, because each addresses a different category of risk. Understanding them helps you read a maintenance proposal and spot what a cheap quote has quietly left out.
| Type | What it does | Example |
|---|---|---|
| Corrective | Fixes bugs and defects that are already affecting users | App crashes on checkout; fix and redeploy |
| Adaptive | Updates the app to match a changed external environment | iOS 19 deprecates an API; update before it breaks |
| Perfective | Improves performance, usability and efficiency | Cut app launch time from 4 seconds to 1.5 |
| Preventive | Reduces future risk by refactoring and monitoring | Replace an ageing library before it becomes unsupported |
| Emergency support | Rapid response to a live outage or critical issue | Payment gateway down; fix within hours, not days |
Corrective maintenance is the one everyone expects: things break, you fix them. Adaptive maintenance is the one people forget, and it is arguably the most important, because it is what keeps your app compatible with new operating systems and store policies. Perfective maintenance is what keeps your app feeling fast and modern rather than slowly degrading into something users abandon. Preventive maintenance is the cheapest of all in the long run, because fixing a problem before it happens always costs less than fixing it during an outage.
Emergency support is the one you hope never to use and cannot afford to be without. When your payment flow breaks on a Friday afternoon during your busiest week, the difference between a maintenance contract that includes a guaranteed response time and one that does not is measured in lost revenue. Ask any prospective provider one direct question: what is your guaranteed response time for a critical, app-down issue? If the answer is vague, that is your answer.
Our stance: a maintenance contract that only covers corrective work is not really maintenance. It is reactive firefighting. A proper arrangement is weighted toward preventive and adaptive work, because those are the activities that stop fires starting. If a quote is suspiciously cheap, it is almost always because it has stripped out the preventive and adaptive layers and left you with bug fixes only.
The hidden costs most UK businesses forget are the recurring platform fees, the third-party service charges that scale with usage, and the year-two reality that maintenance spending does not drop after launch, it continues indefinitely. These are the costs that turn a comfortable budget into an awkward conversation six months after go-live.
Start with the fixed platform fees, which are small but mandatory and easy to overlook:
| Fee | Cost | Frequency | Notes |
|---|---|---|---|
| Apple Developer Programme | £99 | Per year | Required to keep an iOS app published; lapses delist your app |
| Google Play Developer | £25 | One-off | Single registration fee for a Play Store account |
| App store commission | 15% to 30% | Per transaction | Taken on in-app purchases and subscriptions, not free apps |
| SSL certificate | £0 to £200 | Per year | Free options exist; EV certificates cost more |
| Domain renewal | £10 to £40 | Per year | For your API and web assets |
The app store commission catches out businesses with subscription or in-app purchase models. Apple and Google take 15% to 30% of every digital transaction processed through their stores. If your app sells subscriptions, that is not a maintenance cost, but it is a recurring cost of ownership that belongs in your financial planning. A £4.99 monthly subscription nets you roughly £3.49 to £4.24 after the platform takes its cut.
Then there are the usage-scaled third-party costs. Push notification services, SMS verification, transactional email, mapping tiles, and analytics all charge per use. They cost almost nothing at launch and quietly grow as your app succeeds. A business that budgets for these at launch volumes is in for a surprise at scale.
The biggest forgotten cost is psychological rather than technical: the year-two reality. There is a widespread assumption that the heavy spending stops once the app is launched and stable. It does not. Year two often costs as much as the first year of maintenance, because the app now has real users generating real load, real support tickets and real compliance obligations. The honest framing is this: maintenance is not a tail that fades out. It is a permanent operating cost for the entire life of the app. Plan a three-year total cost of ownership, not just a launch budget, and you will never be ambushed.
UK regulations directly increase your maintenance budget if your app handles personal data, payments or health information, and the 2026 regulatory landscape has shifted in ways every app owner should understand. Compliance is not a one-off task at launch. It is an ongoing maintenance obligation that must be funded every year.
The big regulatory development is the Competition and Markets Authority designating Apple and Google with Strategic Market Status for mobile platforms in October 2025. The first commitments under that designation, covering fairer app review processes and greater transparency in store ranking, took effect on 1 April 2026. Apple is appealing a separate ruling concerning roughly £1.5 billion in UK App Store fees. For app owners, the practical upshot is a period of change in how the stores operate, which means your maintenance provider must stay current with shifting review rules and ranking transparency requirements. This is precisely the kind of moving target that adaptive maintenance exists to absorb.
Beyond the platforms themselves, three compliance obligations carry real annual cost:
For apps in fintech and healthcare, compliance alone can add £10,000 to £30,000 a year on top of the base maintenance figure. That covers ongoing security testing, audit preparation, documentation, and the engineering time to implement changes when regulations move. It is a significant line, and it is why these apps sit at or above the top of the 15% to 25% range.
Our view: treat compliance as a maintenance line from the start, not as a crisis to be funded reactively after a complaint or a breach. The cost of building privacy and security in continuously is a fraction of the cost of retrofitting it under regulatory pressure, and a tiny fraction of an ICO fine. If your app touches sensitive data, a serious automation and data handling partner will bake compliance into every release rather than bolting it on.
For most UK SMEs, an outsourced retainer is the most cost-effective and least risky model, because it gives you a dedicated team without the fixed overhead of hiring. In-house maintenance only makes sense when your app is central to your business and busy enough to keep at least one or two engineers occupied full time. Here is the honest comparison.
| Model | Typical annual cost | Best for | Main drawback |
|---|---|---|---|
| In-house team | £60,000 to £120,000+ per developer | App-centric businesses with heavy ongoing development | High fixed cost; idle capacity; hiring and retention risk |
| Pay-as-you-go agency | Hourly, £70 to £120 per hour | Infrequent, unpredictable needs | No proactive monitoring; slow response; no relationship continuity |
| Monthly retainer | £800 to £4,000 per month | Most SMEs wanting predictable cost and proactive care | You pay even in quiet months; choose the right tier |
The in-house route looks attractive until you do the arithmetic. A capable mobile engineer in London costs £60,000 to £90,000 in salary alone, before national insurance, pension, equipment, recruitment fees and management time. To maintain both iOS and Android properly, you often need more than one person. Unless your app generates enough work to keep them busy, you are paying full-time salaries for part-time work, and carrying the risk that your single engineer leaves and takes the knowledge with them.
Pure pay-as-you-go is the opposite failure mode. It feels cheap because you only pay when something breaks. But there is no one watching your app between incidents, no preventive work, and when you do have an emergency you are at the back of the queue behind retained clients. You get reactive firefighting at premium hourly rates.
The retainer sits in the sensible middle. You get a predictable monthly cost, a team that already knows your codebase, proactive monitoring, and a guaranteed response time when something goes wrong. For a business spending £9,000 to £15,000 a year on maintenance, a retainer of £800 to £1,250 a month covers it with the cost smoothed across the year. Our honest recommendation for the typical UK SME: take the retainer, choose a tier that matches your risk, and keep feature development as a separately scoped budget on top.
If you don't maintain your app, the most likely outcomes are app store delisting, security breaches, broken functionality after OS updates, and a steady loss of users to churn. None of these arrive on a schedule. They arrive suddenly, usually at the worst possible time, and the cost of the resulting emergency repair almost always exceeds what a year of maintenance would have cost.
Here is what neglect looks like in practice, roughly in the order it tends to happen:
The financial logic is stark. A business that skips a £10,000 annual maintenance budget to save money does not actually save it. It defers it, with interest. When the app breaks, the rebuild or emergency fix is typically more expensive than the maintenance would have been, the business loses revenue during the downtime, and it spends more winning back users than it would have spent keeping them.
Be sceptical of the temptation to treat maintenance as the line you cut when budgets tighten. It is the cheapest insurance you will ever buy against the most expensive failures your app can have. The honest rule: if you cannot afford to maintain an app, you cannot afford to launch one.
Softomate Solutions maintains UK mobile apps through a five-stage process built around predictable monthly retainers, fixed-quote feature work and a guaranteed response time for critical issues. We are a London-based software and automation agency in Stanmore (HA7), and we maintain apps we built and apps built by others. Our principle is simple: no surprise invoices, no vague "it depends", and a clear line between baseline maintenance and optional feature development.
Our five-stage maintenance process:
A realistic timeline for a typical mid-sized app:
| Stage | Timeline | Outcome |
|---|---|---|
| Audit and onboarding | Week 1 to 2 | Health report and risk list delivered |
| Stabilise and secure | Week 2 to 4 | Critical issues resolved, app brought current |
| Ongoing monitoring | Continuous | Proactive alerts, no silent failures |
| Maintenance releases | Monthly or as needed | App stays compatible and secure |
| Roadmap and reporting | Monthly | Clear spend visibility and forward plan |
Our maintenance retainers start at £800 a month for a straightforward app and scale with complexity, traffic and compliance load. Every feature beyond baseline maintenance is quoted as a fixed price before any work starts, so you are never billed for an open-ended estimate. If your app also needs new integrations or a connected back office, our wider software development team and custom CRM specialists work from the same fixed-quote principle. We give you a defensible annual budget with the line items shown, not a single number you have to trust on faith.
Practically, yes. While no law forces you to update an app, Apple and Google can delist apps that have not been maintained, OS updates will break unmaintained apps, and if you handle personal data, UK GDPR obliges you to keep it secure, which requires ongoing patching. An unmaintained app is a liability waiting to surface.
Your app will gradually break as new iOS and Android versions ship, may be rejected at your next update or delisted entirely, and becomes a security risk if vulnerabilities go unpatched. Users churn as the app feels slow and buggy. The eventual emergency fix usually costs more than a year of routine maintenance would have.
Budget 15% to 25% of your original build cost annually. A £50,000 app costs roughly £7,500 to £12,500 a year, and a £60,000 app costs £9,000 to £15,000. Apps handling payments or health data sit at the top of that range, often adding £10,000 to £30,000 for compliance.
Yes. The Apple Developer Programme costs £99 per year and must stay current to keep your iOS app published. If it lapses, your app can be removed from the App Store. Google Play charges a one-off £25 registration fee rather than an annual one, plus commission on any in-app sales.
Apple and Google take 15% to 30% commission on in-app purchases and subscriptions processed through their stores. The lower 15% rate typically applies to small businesses and to subscriptions after the first year. Free apps with no in-app purchases pay no commission, only the developer account fees.
You can if you have qualified mobile engineers in-house, but for most SMEs a full-time iOS and Android team costs far more than an outsourced retainer and leaves you exposed if a single developer leaves. A retainer gives you a team that already knows your codebase, proactive monitoring and predictable monthly cost.
Hosting scales with usage. As more people use your app, they consume more server capacity, bandwidth and storage, so the cost grows with your success. A simple app might cost £500 a month to host, while a high-traffic consumer app with media and real-time features can exceed £2,000 a month.
In October 2025 the CMA gave Apple and Google Strategic Market Status, and the first commitments around fairer app review and ranking transparency took effect on 1 April 2026. For app owners this means a period of change in store rules, which your maintenance provider must track so your app stays compliant with shifting requirements.
Maintenance keeps your app working as built: fixing bugs, patching security, and updating for new OS versions. Feature development makes the app do more than it did. Keep them as separate budget lines. Maintenance is the non-negotiable baseline, while features are an investment decision you make consciously over time.
For a critical, app-down problem affecting users or payments, a serious provider guarantees a response measured in hours, not days, and that response time is written into the contract. If a prospective provider cannot state a clear guaranteed response time for emergencies, treat that vagueness as a warning sign.
The figure to anchor on is 15% to 25% of your build cost every year, which puts a £60,000 app at £9,000 to £15,000 annually and a compliance-heavy fintech or healthcare app considerably higher. That budget is not one number but a stack: hosting from £6,000 to £24,000, security patching from £2,000 to £5,000, bug fixes, OS compatibility, third-party fees, the £99 Apple Developer Programme, and ongoing UK GDPR and PCI-DSS compliance where it applies. The five maintenance types, corrective, adaptive, perfective, preventive and emergency, must all be covered, and for most UK SMEs a monthly retainer beats both in-house hiring and reactive pay-as-you-go. Neglect is the expensive path: delisting, breaches and churn cost far more than the maintenance you skipped. Plan three years of ownership, not just a launch, and your app stays an asset rather than becoming a liability.
Ready to put a defensible annual maintenance budget behind your app? Talk to our team about a fixed-quote retainer through our mobile app development service in London or get in touch via our contact page.
Written by Deen Dayal Yadav, Founder of Softomate Solutions, a London-based software development and automation agency in Stanmore (HA7). With over 12 years building software, mobile apps and automation systems for UK businesses, Deen has helped companies plan realistic total cost of ownership for the apps they rely on. Softomate Solutions is a UK company registered with Companies House. Learn more about our team and approach.
We protect the real names of all clients featured in examples and case studies. Every testimonial is from a real client.
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