The foundation: engage.re
Sector Capacity 30 July 2026 11 min read

What Does It Cost to Own and Run Your Own Systems?

We build each organisation its own system, and we say that it costs less than the rent you pay today. That statement needs proof, because a build of your own has always cost more. This article works through the full cost. It shows the largest cost that most comparisons leave out, which is your own staff. It compares an organisation with a technical team against an organisation with none. It then shows which part of that cost a shared body removes.

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70%
of a usual IT budget runs the current estate
£371,310
the yearly cost of five council estate staff, with all employment costs
£4.1bn
NHS trust IT spending in 2024/25, an increase of 9% in one year

What are the three costs of software?

There are three costs. Most comparisons show only the first cost.

  1. The payment to a supplier. A subscription, or a build cost.
  2. The payment to your own staff. The team that runs the estate.
  3. The payment for a change of structure. Each new service, merger or report duty.

The second cost is usually the largest, and a business case rarely includes it.

How much of a budget runs the estate?

About 70%. The usual plan divides a budget into 70% running, 20% improvement and 10% new work.

Organisations with older systems have a higher figure. Industry analysis reports 75% to 85% for maintenance. This leaves 15% to 25% for all new work.

That last figure controls your AI programme. An organisation with 15% of its technology budget available cannot adopt much. The limit is not the AI budget. The limit is the cost of running above it.

The public figures show the scale. UK councils spend £1bn to £2bn each year on IT. As much as £1bn of that spending keeps legacy systems. NHS trust IT spending reached £4.1bn in 2024/25, an increase of 9% in one year. IT was 2.3% of a trust annual budget.

What does a technical team cost?

Examine a team of five people that runs an estate. The salaries below are UK medians from advertised vacancies in the six months to July 2026.

Employment costs increase each salary. Employer National Insurance is 15% above a £5,000 threshold. Employer pension contributions add 16.6% for the Local Government Pension Scheme, and 23.7% for the NHS scheme.

Role Median salary Cost to a council Cost to an NHS trust
Solutions architect£85,000£111,110£117,145
IT manager£55,000£71,630£75,535
Systems administrator (two)£45,000 each£116,940£123,330
Developer£55,000£71,630£75,535
Five staff£285,000£371,310£391,545

Apply the 70% running figure to the council total. The result is £259,917 each year, and £1,299,585 across five years.

An estate with older systems is at 80%. The same five staff then cost £297,048 each year to run the estate.

What does that team do?

Most of the running budget pays for work that produces no new function.

  • Maintenance of the mapping rules. Each pair of systems needs a rule, and each rule needs maintenance.
  • Management of the suppliers. Each supplier has a contract, a plan, a support process and a security review.
  • Migrations. Each change of database structure needs a plan, a test cycle and a release.
  • Correction of the figures. An analyst explains the difference between two reported numbers.
  • Patches and assurance. The team repeats this task for each system in the estate.

None of this work makes your organisation different from a competitor. Each organisation in your sector does these five tasks this month.

The comparison of three approaches

Examine the same organisation under three approaches, across five years.

Cost Subscription today Usual bespoke Hub approach
SupplierAn increase each year. You get no asset.One build cost.One build cost.
Change of structureA price for each change.A migration for each change.A dictionary entry. No migration.
Your own staffThe full running cost.The full running cost. You also own the code.A lower cost. The hub does the shared running work.
Shared costNone. Each buyer pays separately.None.One specification serves each member.
After five yearsYou own no asset.You own the system and its migration debt.You own the system.

Column two explains the usual result for bespoke work. You accept the build cost, and you keep the full running cost. Column three changes that result, because the running cost is the largest figure.

One requirement makes column three possible. The shared foundation already contains identity, access control, encryption, retention and audit. Your build therefore covers only the part that is specific to your organisation. We explain the market effect in what does an interoperable software market look like.

Do you still need a technical team?

Yes. A supplier that says something different is incorrect.

Your team keeps the work that needs the knowledge of your organisation. It decides the purpose of the service. It decides the importance of each change. It decides whether a change is correct for your users.

The hub does the work that is identical for each member. The mapping rules, the migrations, the regulatory changes and the supplier management.

The honest statement. The hub does not remove your team. It removes most of the 70% running cost. The same staff then use their time on the 30% that improves your service.

Measure this number with your own figures. Multiply your technology staff cost by 0.7, then multiply by five. A hub fee must be less than that total.

The organisation with no technical team

Most care providers, schools and charities employ no technical staff. Their arithmetic is simpler, and the difference is larger.

A medium care group pays £55,000 to £60,000 each year for its care software. Across five years this is £275,000 to £300,000, and the group owns no asset at the end.

The alternative is one build cost and full ownership. You then pay a flat annual fee of a few thousand pounds, with no fee per bed. Our published figures cover a small or medium residential home. They show a bespoke build at £20,000 to £50,000. Maintenance is 10% to 15% of the build cost each year. A group is above that range.

Two differences control the five-year result. The subscription continues, and it buys no asset. The build cost stops.

We show the full care sector figures in care home software costs. We explain the renewal arithmetic in your software bill goes up every year.

What ESRE Media offers

We build your system on engage.re, and you own the result.

  • No fee for each seat. Your staff number and your bill are separate figures.
  • A change of structure is configuration. Five database tables hold all data, and those five tables never change. A new record type is a dictionary entry, and not a migration.
  • You own the code, the data and the instance. The ownership continues if you leave the partnership.
  • You can run the system yourself. We publish a conformance package at version 2.0.0.

For each sector we then create a sector technology hub with the first organisations.

  • The hub runs at cost. A board from the sector charter agrees the fee against the running cost of the hub.
  • Each new member decreases the fee for all members. The fee continues to decrease as the partnership increases.
  • One specification serves each member. The hub records each regulatory change one time, then applies it to each member system.
  • Members choose their level. The hub makes a change, or your team makes the change and the hub examines it before installation.

We are developing the first hub for the care home sector.

The same arithmetic at two sizes

A council runs forty systems from twenty suppliers. Its five estate staff use about £260,000 each year on running work. Most of that spending pays for mapping rules and migrations that each adjacent authority also pays for.

A care group with three homes employs no technical staff. It pays a supplier £57,000 each year, and it absorbs the rest as manager time with no cost record. The total is smaller, and the part of the budget is larger.

The care home software and charity software pages cover the sector in detail.

The limits of these figures

  • The 70% figure is a planning benchmark, and it is not your figure. Measure your own division before you use it.
  • A hub fee is a real cost. It must be less than the running cost that it replaces. A board that agrees the fee can confirm this.
  • Salary medians change by region and by source. The figures above come from advertised vacancies, and London figures are higher.
  • A build costs more than a subscription in year one. The comparison is correct only across a period of years.
  • Shared approaches have failed before. Ownership and exit stop a hub from becoming a new lock-in.

What to do next

  1. Add your technology staff cost, with employer pension and National Insurance included.
  2. Ask your team for the part of their time that running work uses. Compare the answer with 70%.
  3. Multiply the running part by five years. This total is your comparison figure.
  4. Add each change that you paid for in the last three years.
  5. Then compare that total against a build cost, a flat fee, and a smaller team.

Common questions

What part of an IT budget runs the current estate?

About 70%. The usual plan divides a budget into 70% running, 20% improvement and 10% new work. Estates with older systems are at 75% to 85% for maintenance. This leaves 15% to 25% for all new work. UK councils spend £1bn to £2bn each year on IT, and as much as £1bn keeps legacy systems.

What does a technical team cost?

Five estate staff cost a council £371,310 each year, with all employment costs included. The team is a solutions architect, an IT manager, two systems administrators and a developer. The UK median salaries are £285,000 in total. Employer National Insurance adds 15% above a £5,000 threshold, and the Local Government Pension Scheme adds 16.6%. The same team costs an NHS trust £391,545, because its pension rate is 23.7%.

Does a shared hub remove our technical team?

No. Your team keeps the work that needs the knowledge of your organisation. It decides the purpose of the service. It decides the importance of each change. It decides whether a change is correct for your users. The hub does the work that is identical for each member. That work is the mapping rules, the migrations, the regulatory changes and the supplier management.

Why does usual bespoke software cost more?

You accept the build cost, and you keep the full running cost. You then own the code and its migration debt. The running cost is the largest figure, so a bespoke build that does not decrease it makes no saving.

How does this affect our AI programme?

Directly. An organisation with older systems has 15% to 25% of its technology budget available for all new work. AI competes for that part with each other project. A lower running cost creates the space, so the limit is the estate and not the AI budget.

What does ESRE Media offer?

We build your system on engage.re, with no fee for each seat. You own the code, the data and the instance. A new record type is a dictionary entry, and not a migration. We then create a sector technology hub that runs at cost. Each new member decreases the fee for all members. One specification serves each member system.

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Sources and further reading