<![CDATA[Heritage churches in Indonesia are usually repaired only after damage becomes visible, and their funding rarely looks beyond one budget year. Indonesian life cycle cost (LCC) studies mostly cover new buildings and investment feasibility, so they say little about how conservation value should shape the timing and type of intervention. This article develops an LCC framework for comparing reactive and preventive maintenance of a heritage church, with Gereja GMIM Sion Tomohon as the reference case. The framework was synthesised from ISO 15686-5, Indonesian heritage regulations, the Burra Charter, and earlier heritage maintenance studies. It links four component assessments (physical condition, remaining service life, conservation value, damage risk) to scheduling rules, two cost scenarios evaluated by net present value over 30 years, a sensitivity test, and a conservation screen. A parametric break-even model shows that, at a 6% real discount rate and a ten-year deferral of major repair, preventive work stays cheaper while its annual cost is below about 1.8% of the major repair cost without damage escalation, and below about 3.8% when waiting raises that cost by half. Damage escalation moved the threshold more than the discount rate did, so field records of damage spread deserve priority.]]>
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