Case · Church & Cultural Heritage
Saved 7 million DKK while fireproofing cultural heritage in a single visit
A traditional inspection would point to a new roof costing 7.76M DKK. The drones showed the roof is 63% in good condition and can be maintained for 24,500 DKK/year. On top of that, the parish council got a 3D model of the entire church — inside and out — as a Fire Safety Documentation Archive.
Headline numbers
7.0M DKK
Saving over 30 years
Maintenance vs. a new roof
63%
Roof condition
Intact — not in disrepair
−94%
CO₂ load
Maintenance instead of a new roof
3D
Heritage archive
Interior + exterior
Two deliverables, one drone visit
Deliverable 1
Roof — Damage report
51-page interactive report with 4 roof surfaces, K0–K3 damage classification and a phased 30-year plan. The parish council knows exactly what to do over the next 5 years.
Deliverable 2
Cultural heritage — 3D model of the church
A photogrammetric digital twin — roof, tower, altar, pulpit, organ, frescoes. If the church burns, it can be rebuilt 1:1. This is the Notre-Dame case.
The simple story — two deliverables, one drone visit
Høje Taastrup Church has a roof with enough damage that a consulting engineer doing a traditional inspection would quickly point to a full replacement — 7.76M DKK over 30 years.
The drones showed something different. The roof is 63% in good condition. The damage is measurable, spread across 4 roof surfaces, and can be repaired in three phases. The total maintenance cost over 30 years is 735,000 DKK — i.e. 24,500 DKK/year.
“It’s not a luxury investment. It’s responsible cultural-heritage management.”
A parish council that knows what to do over the next 5 years — and that has documented the cultural heritage in case the worst happens. Both delivered in a single drone visit. Services, baptisms and funerals carry on undisturbed while the drone flies.
The numbers — Damage report, 30-year reference
7.76M DKK for a new roof — or 0.74M DKK in maintenance.
The central financial point: the damage follows classic ageing patterns for a Danish church tile roof — predictable and manageable by a competent roofer. There’s no need to build a new roof to remove it.
7.0M DKK
Possible saving (91%) in the parish council’s funds — 24,500 DKK/year instead of a 7.76M DKK roof project all at once.
Calculated with 5% annual interest and a 30-year reference period per EN 15978, excluding engineering hours and design. The figures are DroneTjek’s own estimates from the damage report — not recalculated via AssetEye for this specific church.
Phased repair — budget on three levels, not one big hit
The phased split matches a realistic backlog horizon. The parish council can allocate acute liquidity, medium-term operating expense and a long-term maintenance pool separately.
Phase 1 · 6–12 months
Immediate actions
Stop water intrusion
- Replace cracked, loosened and chipped roof tiles
- Seal and repair defective flashings
- Clean gutters and valley gutters of blockages
Phase 2 · 1–3 years
Strategic maintenance
Planned, not immediate
- Repair the boarding/battens at the roof ridge
- Renew joints and damaged mortar
- Repair chimney and gable
Phase 3 · 3–5 years
Follow-up actions
Maintain roof operations
- Follow up on work from Phases 1+2
- Surface-treat wooden parts
- Periodic inspections and adjustment
Get Started
Want the same basis for your church?
Let us fly over your church. One flight gives you both a roof maintenance plan and a 3D fire-safety documentation — without disrupting services.
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