Application Maintenance Contract in Singapore: 2026 Annual Cost & SLA

The verdict in three sentences

A well-scoped maintenance contract costs 12-20% of build cost per year as a fixed fee, or USD 550-750/day on time and materials. The real price lever is the SLA: moving from a 24 h to a 4 h resolution guarantee can double the fee. Always separate corrective work (included) from evolutive work (billed as it goes) to avoid surprises.

The three maintenance models

Maintenance is contracted under three models. The fixed fee offers predictability: a set monthly amount covers a defined scope. Time and materials bills by day rate: flexible but less predictable. The hybrid combines a fixed base (corrections + monitoring) and a pool of evolution days.

For an app whose build cost USD 70,000, a fixed-fee contract therefore runs USD 8,400-14,000/year, or USD 700-1,170/month.

In scope, out of scope and SLA x price grid

Scope is the heart of the contract. Usually included: bug fixes, security updates, monitoring, backups, light user support. Usually excluded (so billed as evolution): new features, UX redesign, third-party integrations, major migration.

The resolution guarantee should not be confused with response time. It's service restoration, not a mere acknowledgement, that protects your business.

Mini case study

Wei, CFO of a mid-sized services firm in Singapore, had a custom platform built for USD 90,000. He hesitates between time and materials and a fixed fee. On T&M, his estimated 18 days/year at USD 650 = USD 11,700, but with no delay commitment. He picks a hybrid Silver fee: base USD 1,000/month (corrections + monitoring + 8 h resolution) + 8 prepaid evolution days at USD 640 = USD 12,000 + 5,120 = USD 17,120/year. He gains predictability and an enforceable SLA, for about 19% of build cost.

FAQ

What maintenance budget should I plan after a project?

Budget 12-20% of build cost per year. For a USD 70,000 app, that's USD 8,400-14,000/year. This ratio rises if the app is critical or has strong security requirements.

What's the difference between corrective and evolutive?

Corrective work fixes what exists (bugs, security) and is included in the fee. Evolutive work adds features: it's billed by day (USD 550-750/day) or via a prepaid pool.

What does a 4 h resolution guarantee mean?

A 4 h resolution guarantee commits the provider to restore service within 4 h of a critical incident. Such a tier (Gold) costs 60-90% more than the Bronze base.

Can I start with no commitment?

Yes, via ad-hoc support at USD 650-850/day, but with no guaranteed SLA. That suits a low-criticality app; for a production app, a contract with an SLA is strongly recommended.

Does maintenance include hosting?

Not necessarily. Hosting (USD 160-1,000/month depending on load) is often billed separately. Some hybrid contracts include it: always check this before comparing two quotes.

Let's scope your project. Tell us your app's build cost, its criticality and the target SLA (4h/8h/24h resolution): we'll propose the right maintenance model. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.