The UK defence estate spans more than 4,000 sites worldwide and roughly 220,000 hectares of owned land, from RAF runways to naval bases to family housing. Managing maintenance across that scale on a legacy fix-on-failure model has left the Ministry of Defence carrying one of government's largest backlogs, with defence properties alone accounting for over £15 billion of it. Start a free trial to see how Oxmaint supports the shift from reactive repair to planned, tracked defence estate maintenance.
£15.3bn
Estimated maintenance backlog attributed to Ministry of Defence properties, per NAO analysis
4,000+
Defence sites the DIO manages across the UK and overseas
220,000ha
Land directly owned by the MOD, roughly 1.4% of the UK's total landmass
£3bn
Total value of the Future Defence Infrastructure Services programme now under way
From Fix-on-Failure to Planned Maintenance
For years, much of the defence estate was maintained reactively — repairing what failed rather than replacing what was ageing. The DIO's Asset Lifecycle and Replacement Model (ALaRM) marks a deliberate shift toward proactive planning, using inspection data to prioritise funding by operational importance and safety risk rather than waiting for the next failure to force action.
Three Estates Under One Umbrella
The FDIS programme organises defence infrastructure into three distinct categories, each with its own contracts, standards and risk profile.
Estate 1
Built Estate
Hangars, workshops, offices and operational buildings across more than 400 defence sites nationwide.
Estate 2
Service Family Accommodation
Homes for tens of thousands of military families, where maintenance quality directly affects welfare.
Estate 3
Defence Training Estate
Ranges, training grounds and support infrastructure with its own safety and access requirements.
Where Legacy Estate Management Falls Short
01
Structural Risk Tracked Separately From Routine Work
Safety-critical issues need their own visibility
Issues like RAAC in ageing structures require urgent, prioritised tracking distinct from day-to-day repairs. When structural risk data sits in a separate system from routine maintenance logs, it's harder to see the full risk picture for any single building at a glance.
02
Multiple Contractors, Multiple Systems
Regional FM contracts don't always share a common record
With facilities management split across regional contractors, each running their own scheduling and reporting tools, getting a single view of asset condition across the whole estate becomes a manual exercise in reconciling several data sources.
03
Missed Appointments Erode Trust
Service families feel the impact of scheduling gaps directly
When appointment scheduling relies on systems that aren't well connected to the field team's actual workload, families can be left waiting for repairs that were logged but never clearly assigned or confirmed.
04
Statutory Compliance Evidence Is Scattered
Fire, water and electrical records live with different providers
Statutory checks across fire safety, water hygiene and electrical systems are often carried out by different specialist providers, making it harder to pull a complete compliance picture for a single site on demand.
Bring Your Estate Data Onto One Platform
Oxmaint gives defence estate teams one register for asset condition, statutory compliance and planned maintenance across sites and contractors. Sign up for a free trial to explore it, or book a demo to talk through how it fits your estate structure.
Risk, Root Cause and the Digital Fix
| Estate Risk |
Root Cause |
Digital Fix |
| Structural hazards missed until urgent |
Risk data separated from routine maintenance records |
One asset record combining condition, risk flags and history |
| No estate-wide view across contractors |
Each regional FM contract runs its own reporting tool |
A shared platform contractors and DIO teams can both report into |
| Missed accommodation repair appointments |
Scheduling disconnected from field team capacity |
Mobile work orders assigned and confirmed in real time |
| Compliance evidence hard to assemble quickly |
Statutory records held by separate specialist providers |
Fire, water and electrical checks logged against the same asset |
What Digital Transformation Should Deliver
Capability 01
A Single Asset Record Across Estates
Built Estate, accommodation and training estate assets sit on one platform, so condition and risk data don't stay siloed by contract or category.
Capability 02
Risk-Based Maintenance Prioritisation
Structural and safety flags surface alongside routine maintenance history, so funding decisions can follow operational importance and risk rather than which ticket arrived first.
Capability 03
Mobile Scheduling for Field Teams
Repair appointments are assigned and confirmed directly against real field capacity, cutting the gap between a logged request and a completed visit.
Capability 04
Consolidated Compliance Reporting
Statutory checks from multiple specialist providers are logged against the same asset, so a full compliance picture for any site is available without chasing several contractors.
How Oxmaint Supports Defence Estate Teams
Oxmaint gives defence infrastructure and estate teams one platform for asset condition, planned maintenance and statutory compliance, built to work across multiple contractors and site types. Structural and safety risk sits alongside routine maintenance history, so priorities are visible at a glance rather than reconstructed from separate reports. Book a demo to discuss how it maps to your estate structure and reporting requirements.
Frequently Asked Questions
Q
Why has the MOD estate maintenance backlog grown so large?
A long-standing reliance on fix-on-failure maintenance, combined with an ageing estate and historic underinvestment, has allowed deferred work to accumulate. National Audit Office analysis attributes over £15 billion of the wider government maintenance backlog to defence properties specifically, one of the largest single contributors.
Q
What is the difference between the Built Estate, SFA and Training Estate contracts?
They're the three main categories under the FDIS programme. Built Estate covers operational buildings like hangars and workshops, Service Family Accommodation covers military housing, and the Training Estate covers ranges and training infrastructure. Each is contracted and maintained differently because the risk profile and usage pattern differ significantly.
Q
How does risk-based prioritisation differ from the old reactive approach?
Reactive maintenance waits for something to fail before acting. A risk-based model like the DIO's ALaRM approach instead uses ongoing inspection and condition data to rank maintenance needs by safety risk and operational importance, so funding goes to the highest-priority issues before they become emergencies.
Q
What's a practical first step toward digitising defence estate maintenance?
Start by consolidating asset condition, compliance and maintenance history for one estate category, such as Service Family Accommodation, onto a single platform before scaling to the Built Estate and Training Estate. A working proof point makes wider rollout across contractors and regions far more straightforward.
Move From Fix-on-Failure to a Planned Defence Estate
Oxmaint brings asset condition, planned maintenance and statutory compliance onto one platform across contractors and site types. Sign up for a free trial to explore it yourself, or book a demo and we'll talk through how it fits your estate structure.
Multi-Estate Asset Register
Risk-Based Prioritisation
Mobile Field Scheduling
Consolidated Compliance
Multi-Contractor Ready
